171031801 WURTH | Alldatasheet
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VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 1/49 4V – 18V / 3A / 0.8V – 17V Output
DESCRIPTION
The VDRM series of the Mag I³C Power Module family provides a fully integrated DC-DC power supply including the buck switching regulator, inductor, input and output capacitors in a package, allowing a minimum ext ernal components count solution, quick time to market and ease of use. The 171031801 family offers high efficiency and delivers up to 3 A of output current. It operates from 4V input voltage up to 18V. It is designed for fast transient response. It is available in an innovative industrial high power density LGA-16EP (9 x 9 x 3mm) package that enhances thermal performance. The V DRM regulators have an integrated protection circuit that guards against thermal overstress and electrical damage by using t hermal shut -down, overcurrent, short-circuit, and undervoltage protection. TYPICAL APPLICATIONS Point-of-Load DC -DC applications from 5V, 9V and 12V industrial rails Industrial, test & measurement, medical applications System power supplies DSPs, FPGAs, MCUs and MPUs supply I/O interface power supply TYPICAL CIRCUIT DIAGRAM
FEATURES
Peak efficiency up to 95% Current capability: 3A Input voltage range: 4V to 18V Output voltage range: 0.8V to 17V Reference accuracy: ±1.5% No minimum load required Integrated input and output capacitors Integrated shielded inductor Exposed pads for best-in-class thermal performance Low output voltage ripple (< 20mVpp) Fixed switching frequency: 850kHz Peak Current Mode control Internal soft-start Synchronous operation Automatic power saving operation at light load Undervoltage lockout protection (UVLO) Thermal shutdown Short circuit protection Cycle-by-cycle current limit Operating ambient temperature up to 85°C RoHS and REACh compliant Operating junction temp. range: -40 to 125°C Mold compound UL 94 Class V0 (flammability testing) certified Complies with EN55022 class B radiated emissions standard NO NEED FOR COUT NO NEED FOR CIN VIN EN GND FB VOUT Module RFBT RFBB 1,2,3,4 9,10,11,12VIN GND GND VOUT
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 2/49 PACKAGE VIN 1 VIN 2 VIN 3 VIN 4
12 VOUT
11 VOUT
10 VOUT
9 VOUT
1 VIN
2 VIN
3 VIN
4 VIN
SYMBOL NUMBER TYPE DESCRIPTION VIN 1,2,3,4 Power The supply input pins are a terminal for an unregulated input voltage source. These pins are internally connected together. Connect externally all together with a single PCB track. VOUT 9,10,11,12 Power The output voltage pins are connected to the internal inductor. These pins are internally connected together. Connect externally all together with a single PCB track. FB 13 Input The feedback pin is internally connected to the regulation circuitry . The regulation reference point is 0.8V at this input pin. Connect the feedback resistor divider between the output and GND to set the output voltage. EN 16 Input Connecting this pin to a voltage lower than 0.4V (e.g. GND) disables the device. Connecting this p in to a voltage higher than 1.2V enables the device. This pin is connected to ground through an internal pull -down resistor. Therefore leaving this pin open disables the device. PGND EP Exposed Pads These pins are the ground connection of the device. All pins must be connected together externally with a copper plane for heat sinking NC 5,6,7,8,14,15 Not connected These pins are not connected to the internal circuitry and are not connected to each other. They can be left floating Marking Description WE Würth Elektronik tradename MagI³C MagI³C Logo
171030801 Order Code
E4 Lead finish code per Jedec
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 3/49
ORDERING INFORMATION
ORDER CODE PART DESCRIPTION SPECIFICATIONS PACKAGE PACKAGING UNIT 171031801 WPMDL1301801LD 3A / 0.8-17Vout LGA-16EP Tape and Reel, 1000 pieces 178031801 WPMDL1301801JEV 3A / 0.8-17Vout Eval Board 1 PIN COMPATIBLE FAMILY MEMBERS ORDER CODE PART DESCRIPTION SPECIFICATIONS PACKAGE PACKAGING UNIT 171011801 WPMDL1101801LD 1A / 0.8-17Vout LGA-16EP Tape and Reel, 1000 pieces 178011801 WPMDL1101801JEV 1A / 0.8-17Vout Eval Board 1 171021801 WPMDL1201801LD 2A / 0.8-17Vout LGA-16EP Tape and Reel, 1000 pieces 178021801 WPMDL1201801JEV 2A / 0.8-17Vout Eval Board 1 SALES INFORMATION SALES CONTACTS Würth Elektronik eiSos GmbH & Co. KG EMC & Inductive Solutions Max-Eyth-Str. 1
74638 Waldenburg
Tel. +49 (0) 7942 945 0 www.we-online.com powermodules@we-online.com
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 4/49 ABSOLUTE MAXIMUM RATINGS Caution: Exceeding the listed absolute maximum ratings may affect the device negatively and may cause permanent damage. SYMBOL PARAMETER LIMITS UNIT MIN(1) MAX(1) VIN Input voltage -0.3 20 V VOUT Output voltage -1 VIN V FB FB input voltage -0.3 2.5 V EN EN input voltage -0.3 VIN VESD ESD voltage (Human Body Model), according to EN61000-4-2 (2) - ±2000 V TJ Junction temperature -40 150 °C Tstorage Assembled, non-operating storage temperature -55 150 °C TSOLDER Peak case/leads temperature during reflow soldering, max.20sec (3) 230 240 °C OPERATING CONDITIONS Operating conditions are conditions under which the device is intended to be functional. All values are referenced to GND. SYMBOL PARAMETER MIN(1) TYP(4) MAX(1) UNIT VIN Input voltage 4 - 18 V VOUT Regulated output voltage 0.8 - 17 V IOUT Nominal output current - - 3 A TA Ambient temperature range -40 - 85(5) °C TJ Junction temperature range -40 - 125 °C THERMAL SPECIFICATIONS SYMBOL PARAMETER TYP (4) UNIT ӨJA Junction-to-ambient thermal resistance (6) 22 °C/W TSD Thermal shutdown, rising 150 °C Thermal shutdown hysteresis, falling 15 °C
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 5/49 ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended junction temperature range of -40°C to 125°C. Typical values represents statistically the utmost probable values at the following conditions: VIN = 12V, TA = 25°C, unless otherwise specified. SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (4) MAX (1) UNIT Output current ICL Current limit threshold TA = 25°C - 4.5 6 A Output voltage VFB Reference voltage TA = 25°C 0.784 0.8 0.816 V Reference voltage over temperature 0.776 0.8 0.824 V IFB Feedback input bias current TA = 25°C - 50 - nA VOUT Line regulation VIN = 4V to 18V, TA = 25°C - 0.4 - %/V Load regulation IOUT = 10mA to ICL, TA = 25°C - 0.5 - %/A Output voltage ripple VOUT = 3.3V, IOUT = 3A, TA = 25°C, 20MHz BWL - 15 - mVpp Switching frequency fSW Switching frequency TA = 25°C 0.7 0.85 1 MHz DMAX Maximum duty-cycle TA = 25°C 100 - - % Enable and undervoltage lockout VUVLO VIN undervoltage threshold VIN increasing - 2.9 - V VIN undervoltage hysteresis - 0.25 - V VENABLE EN threshold trip point Enable logic high voltage Enable logic low voltage IENABLE EN pin input current TA = 25°C - 2 - µA Soft-Start tSS Soft-start time - 1 - ms Efficiency η Efficiency VIN = 12V, VOUT = 3.3V, IOUT = 3A, TA = 25°C - 84 - % VIN = 12V, VOUT = 5V, IOUT = 3A, TA = 25°C - 88 - % VIN = 5V, VOUT = 3.3V, IOUT = 500mA, TA = 25°C - 95 - % VIN = 5V, VOUT = 3.3V, IOUT = 3A, TA = 25°C - 85 - % Input current IQ Input quiescent current Switching, no load, VIN = 12V, VOUT = 5V, TA = 25°C - 2 - mA ISD Shutdown quiescent input current EN = 0, TA = 25°C - 2.1 - µA
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 6/49 RELIABILITY SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (4) MAX (1) UNIT MTBF Mean Time Between Failures - Confidence level 60% - Test temperature: 125°C - Usage temperature: 55°C - Activation energy: 1eV - Test duration: 1000 hours - Sample size: 62342 - Fail: 0 3.41·1010 h RoHS, REACh RoHS directive Directive 2011/65/EU of the European Parliament and the Council of June 8th, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. REACh directive Directive 1907/2006/EU of the European Parliament and the Council of June 1st, 2007 regarding the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACh). PACKAGE SPECIFICATIONS MOLD COMPOUND WEIGHT Part Number Material UL Class Certificate Number 0.8 g 171031801 EME-G760L UL94V-0 E41429 NOTES (1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. (2) The human body model is a 100pF capacitor discharged through a 1.5 kΩ resistor into each pin. Test method is per JESD-22-114. (3) JEDEC J-STD020 (4) Typical numbers are valid at 25°C ambient temperature and represent statistically the utmost probability assuming the Gaussian distribution. (5) Depending on heat sink design, number of PCB layers, copper thickness and air flow. (6) Measured on a 8cm x 8cm four layer PCB, 35µm copper, thirty -six 10mil (254µm) thermal vias, no air flow (see “OUTPUT POWER DERATING” section on page 12).
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 7/49 TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: VIN = 12V, TAMB = 25°C. RADIATED AND CONDUCTED EMISSIONS 30 100 1000 Frequency [MHz] Radiated Emissions [dBµV/m] Radiated Emissions 171031801 (3m Antenna Distance ) VIN = 12V, VOUT = 3.3V, ILOAD = 3A with input filter 10µF (885012108021) and 10µH (74477510) Horizontal Vertical EN55022 Class A limit EN55022 Class B limit 0.15 1 10 Frequency [MHz] Conducted Emissions [dBµV] Conducted Emissions 171031801 VIN = 12V, VOUT = 3.3V, ILOAD = 3A with input filter 10µF (885012108021) and 10µH (74477510) Average Quasi peak EN55022 Class B Quasi Peak limit EN55022 Class B Average limit -10 300.5
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 8/49 EFFICIENCY 100 Efficiency [%] Output Current [A]
171031801 VIN = 12V, TA = 25 C
Vout = 5V Vout = 3.3V Vout = 2.5V Vout = 1.8V 100 Efficiency [%] Output Current [A]
171031801 VIN = 12V, TA = 85 C
Vout = 5V Vout = 3.3V Vout = 2.5V Vout = 1.8V
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 9/49 EFFICIENCY 100 Efficiency [%] Output Current [A]
171031801 VIN = 5V, TA = 25 C
Vout = 3.3V Vout = 2.5V Vout = 1.8V 100 Efficiency [%] Output Current [A]
171031801 VIN = 5V, TA = 85 C
Vout = 3.3V Vout = 2.5V Vout = 1.8V
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 10/49 POWER DISSIPATION 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Power Dissipation [W] Output Current [A] Vout = 5V Vout = 3.3V Vout = 2.5V Vout = 1.8V 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Power Dissipation [W] Output Current [A] Vout = 5V Vout = 3.3V Vout = 2.5V Vout = 1.8V
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 11/49 POWER DISSIPATION 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Power Dissipation [W] Output Current [A] Vout = 3.3V Vout = 2.5V Vout = 1.8V 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Power Dissipation [W] Output Current [A] Vout = 3.3V Vout = 2.5V Vout = 1.8V
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 12/49 OUTPUT POWER DERATING The ambient temperature and the power limits of the derating curve represent the operation at the max junction temperature specified in the “Operating Conditions” section on page 4. 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C]
171031801 Current Thermal Derating
VIN = 12V, VOUT = 5V, θJA = 22 C/W
80 C 125 C
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C] VIN = 12V, VOUT = 3.3V, θJA = 22 C/W
82 C 125 C
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 13/49 LINE AND LOAD REGULATION 3,30 3,31 3,32 3,33 3,34 3,35 4 6 8 10 12 14 16 18 Output voltage [V] Input Voltage [V] 171031801 Line Regulation VOUT = 3.3V, IOUT = 3A , TA = 25 C 3,30 3,31 3,32 3,33 3,34 3,35 Output voltage [V] Output Current [A] 171031801 Load Regulation VIN = 12V, VOUT = 3.3V, TA = 25 C
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 14/49 BLOCK DIAGRAM SSSS VREF 0.8V EA & comp. network PWM Modulator Drivers Logic circuitries VIN PGND EN FB VOUT1,2,3,4 EP 9,10,11,123.3µH 10µF10µF RFBT RFBB VIN COMPSSOSCILLATOR OCP detect OCP ref. 100nF 10µF VOUT SSSHUT DOWN SSOTP SSUVLO CIRCUIT DESCRIPTION The MagI³C Power Module series 171031801 is based on a synchronous step down regulator with integrated MOSFET s, power inductor and both the input and the output capacitors . The control scheme is based on a peak Current Mode (CM) regulation loop. The VOUT of the regulator is divided by the feedback resistor divider and fed into the FB pin. The error amplifier compares this signal with the internal 0.8V reference. The error signal is amplified and controls the on -time of a fixed frequency pulse width generator. This signal drives the power MOSFETs. The Current Mode architecture features a constant frequency during load steps. Only the on -time is modulated. It is internally compensated and requires no additional external compensation network. This architecture supports fast transient response and very small output ripple values ( less than 15 mV) are achieved only relying on the integrated output capacitors.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 15/49 DESIGN FLOW The design flow for 171031801 consist of a single step: setting the output voltage trough the external resistor divider. External input and output capacitors are not necessary Essential Step 1. Set the output voltage VIN EN PGND FB VOUT Module RFBT RFBB 1,2,3,4 EP 9,10,11,12VIN GND GND VOUT Step 1 Set the output voltage (VOUT) The output voltage is determined by a divider of two resistors connected between V OUT and ground. The midpoint of the divider is connected to the FB input. The output voltage adjustment range is from 0.8V to 17V. The ratio of the feedback resistors for the desired output voltage is: RFBT RFBB = ( VOUT VFB ) -1 (1) A table of values for RFBT and RFBB, is included in the “TYPICAL SCHEMATIC” section (page 35). NO NEED FOR COUT NO NEED FOR CIN
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 16/49 Optional Steps 2. Add external input capacitors (in case an input voltage ripple reduction is required) 3. Add external outp ut capacitors (in case an output voltage ripple reduction or output voltage under - or overshoot reduction load transient are required) VIN EN PGND FB VOUT Module RFBT RFBB 1,2,3,4 EP 9,10,11,12VIN GND GND VOUT C2C1 2 3 C1 and C2 normally not necessary
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 17/49 Step 2 Select the input capacitor (CIN) The 171031801 integrates already a 10µF MLCC as input capacitor in parallel with a 100nF MLCC. T hese capacitors are enough to fulfil the targeted steady state and transient response under all operating conditions. The resulting input voltage ripple with the internal input capacitors (VIN ripple,INT) is shown in the figure below: If the application has more demanding requirements in terms of input voltage ripple, an external input capacitor can be placed. The input capacitor selection is generally based on different requirements. The first criterion is the input current ripple. Worst case input current ripple rating is dictated by the equation: ICINRMS ≈ 1 2 ∙ IOUT ∙ √ D 1-D (2) where D≈ VOUT VIN As a point of reference, the worst case current ripple will occur when the module is presented with full load current and when VIN = 2 x VOUT. The second criterion is the input voltage ripple. If the system design requires a certain minimum value of pea k-to-peak input voltage ripple then the following equation may be used: CIN ≥ IOUT ∙ D ∙ (1-D) fSW(CCM) ∙ (VIN ripple − ESR∙IOUT ∙ D ) (3) The value of the additional external input capacitor (C IN,EXT) in case a further reduction of the input voltage ripple is required can be calculated with the following equation: CIN,EXT ≥ IOUT ∙ D ∙ (1-D) fSW(CCM) ∙ (VIN ripple − ESR∙IOUT ∙ D ) - CIN,INT (4) where the VIN ripple is the required input voltage ripple and C IN,INT represents the total integrated input capacitance (in this case 10µF+100nF).It is always strongly recommended to pay attention to the voltage and temperature derating of the selected capacitor. -300 -250 -200 -150 -100 -50 100 150 200 250 300 0 2 4 6 8 10 12 Input Voltage Ripple [mV] Time [µs] VIN = 12V, VOUT = 3.3V, IOUT = 3A 250mV
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 18/49 Example VIN = 12V, VOUT = 3.3V, IOUT = 3A, VIN ripple ≤ 1% VIN (=120mV). The duty cycle is theoretically defined as the ratio between the output and the input voltage. Actually , a correct estimate of the duty cycle should consider also the efficiency, as shown by the following formula: D= VOUT VIN ∙ 𝜂 (5) where 𝜂 represents the efficiency and its value under the specified conditions can be read on the diagram on page 8 (84%). The equation (4) can be used to calculate the additional external capacitor to achieve the target input voltage ripple. The actual value of the integrated capacitance (CIN,INT) can be estimated by using capacitance derating diagram of the internal capacitor shown below. From the diagram above, the actual capacitance value of 4.7µF can be read. 0 3 6 9 12 15 18 Actual Input Capacitance [µF] Input Voltage [V] 4.7µF
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 19/49 Now equation (4) can be finally used to calculate the required external input capacitor to fulfil the input voltage ripple requirements, assuming ESR = 5mΩ: CIN,EXT = 3A∙0.327∙(1-0.327) Some margin from the calculated CIN,ext value is recommended in order to take into account: - Approximations within the equations to calculate CIN; - Tolerances and variations of some components and parameters involved in those equations (e.g. fSW, ESR, etc.) - Derating of the capacitors with DC applied voltage and temperature A 4.7µF MLCC (Würth Elektronik 885012109012) is selected as CIN,EXT. The resulting input voltage ripple using the additional input capacitor is depicted by the figure below. -300 -250 -200 -150 -100 -50 100 150 200 250 300 0 2 4 6 8 10 12 Intput Voltage Ripple [mV] Time [µs] VIN = 12V, VOUT = 3.3V, IOUT = 3A 120mV
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 20/49 Step 3 Select output capacitor (COUT) The output capacitance determines the performance in terms of output voltage ripple as well as load transient response. The 171031801 integrates already two MLCC of 10 µF as output capacitors, which are enough to operate under a ll conditions. Therefore no external additional output capacitor is necessary. Output voltage ripple The output capacitor should be selected in order to minimize the output voltage ripple and provide a stable voltage at the output. In general, under steady state conditions the output voltage ripple observed at the output can be defined as: VOUTripple=∆IL ∙ ESR+∆IL ∙ 1 8∙fSW∙COUT (6) where ∆IL is the inductor current ripple, calculated with the following equation: ∆IL= VOUT ∙ (VIN-VOUT) fSW ∙ L ∙ VIN (7) The output voltage ripple achievable with the integrated output capacitors only (VOUTripple, int) is around 15mV, as shown by the figure below. In case the application has more demanding requirements in terms of output voltage ripple, additional external capacitors should be used. The value of the external additional capacitance (COUT,INT) can be calculated using the following equation: COUT,EXT ≥ ∆IL 8 ∙ (VOUTripple - ESR∙∆IL) ∙ fSW − COUT, INT (8) where VOUTripple represents the target output voltage ripple whereas C OUT,INT indicates the total amount of the integrated capacitance (20µF). -30 -20 -10 0 1 2 3 4 5 6 Output Voltage Ripple [mV] Time [µs] VIN = 12V, VOUT = 3.3V, IOUT = 3A 15mV
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 21/49 Example VIN = 12V, VOUT = 3.3V, IOUT = 3A (this parameter does not influence the output voltage ripple). First of all the actual value of the integrated output capacitance must be estimated, using the derating curve below: At VOUT = 3.3V the value of the output capacitance is not reduced due to the voltage, it is instead slightly higher. Nevertheless, a total value of 20µF can be considered for COUT, INT. Assuming that the application requires an output voltage ripple less than 10m V, the additional ext ernal capacitance should be at least 2µF, according to equation (8): COUT,EXT ≥ 0.853A 8 ∙(0.01V - 0.005Ω∙0.853A) ∙ 0.85 MHz - 20μF = 2μF where a value of ESR of 5mΩ is assumed and ∆IL = 0.853A is the inductor current ripple calculated with the equation (7). Some margin from the calculated COUT,ext value is recommended in order to take into account: - Approximations within the equations to calculate COUT; - Tolerances and variations of some components and parameters involved in those equations (e.g. fSW, ESR, etc.) - Derating of the capacitors with DC applied voltage and temperature 0 3 6 9 12 15 18 Actual Output Capacitance [µF] Output Voltage [V] 3.3V 10.4µF
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 22/49 An additional external capacitor of 10µF (Würth Elektronik 885012208069) has been selected as the best performing. The resulting output voltage ripple is shown in the figure below. -30 -20 -10 0 1 2 3 4 5 6 Output Voltage Ripple [mV] Time [µs] VIN = 12V, VOUT = 3.3V, IOUT = 3A 9mV
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 23/49 Load transient response The output voltage is also affected by load transients (see picture below). When the output current transitions from a low to a high value, the voltage at the output capacitor (VOUT) drops. This involves two contributing factors . One is caused by the voltage drop across the ESR (V ESR) and depends on the slope of the rising edge of the current step (t rise). For low ESR values and small load current trasnients, this is often negligible . It can be calculated as follows: VESR = ESR ∙ ∆IOUT (9) where ∆IOUT is the load step, as shown in the picture below (simplified: no voltage ripple is shown). 0 t IOUT 0 t VOUT ∆IOUT ∆VOUT VESR Vdischarge td treg trise The second contributing factor is the voltage drop due to discharge of the output capacitor, which can be estimated as: Vdischarge = ∆IOUT ∙ td 2 ∙ COUT (10) In a current mode architecture the t d is strictly related to the bandwidth of the regulation loop and influenced by the C OUT (increasing COUT, the td increases as well).
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 24/49 The figures below show the load transient response achieved with the integrated capacitors only. If the application demands a lower undershoot or overshoot, an additional external capacitance is necessary. In order to choose the value of the external output capacitor COUT,EXT, the following steps should be utilized: 1. Measure td. 2. Calculate the appropria te value of C OUT,EXT for the maximum voltage drop V discharge allowed at a defined load step, using the following equation (11), derived from equation (10). 3. As mentioned above, changing C OUT affects also t d. Therefore, a new meas urement should be perform ed and, if necessary, the step 1 and 2 should be repeated (it is an iterative process and few steps could be required). COUT,EXT ≥ ∆IOUT ∙ td 2 ∙ Vdischarge - COUT,INT (11) -300 -200 -100 100 200 300 0 30 60 90 120 150 Output Voltage AC [mV] Output Current [A] Time [µs] Load Transient from 1A to 3A VOUT ∆VOUT = 230mV IOUT2 IOUT1 td = 3.2µs -300 -200 -100 100 200 300 0 30 60 90 120 150 Output Voltage AC [mV] Output Current [A] Time [µs] Load Transient from 3A to 1A IOUT1 VOUT ∆VOUT = 250mV IOUT2 td = 3.6µs
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 25/49 Example The following application conditions are used as an example to show how to calculate a suitable C OUT,EXT value, in case the application requirements demand a further reduction of the overshoot and undershoot of the output voltage after the load transient. - VIN = 12V - VOUT = 3.3V - load transient from 1A to 3A and vice versa (∆IOUT = 2A) - max allowed undershoot or overshoot ∆VOUT = 150mV Using equation (11), the value of the additional capacitor C OUT,EXT can be calculated . As explained above, some iterations are necessary in order to find the most suitable value because any change in the output capacitance affects t d, which is in turn involved in determining the value of COUT,EXT, and so on. A combination of two MLCC of 22µF (Würth Elektronik 885012109014) are selected. The load transients with the selected COUT,EXT can be tested using the setup depicted below: MagI³C Power Module COUT,EXT RLoad1 RLoad2 IOUT1 IOUT2 VIN GND VIN VOUT GND 6.6Ω 2.2Ω
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 26/49 The load transient response results with the additional external C OUT,EXT = 2x22µF are shown below. For both the positive (from 1A to 3A) and negative (from 3A to 1A) load transients the undershoot and the overshoot respectively are within the target defined for this example. -300 -200 -100 100 200 300 0 30 60 90 120 150 Output Voltage AC [mV] Output Current [A] Time [µs] Load Transient from 1A to 3A, COUText = 2x22µF VOUT ∆VOUT = 135mV IOUT2 IOUT1 -300 -200 -100 100 200 300 0 30 60 90 120 150 Output Voltage AC [mV] Output Current [A] Time [µs] Load Transient from 1A to 3A, COUText = 2x22µF IOUT1 VOUT ∆VOUT = 145mV IOUT2
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 27/49 ENABLE The enable function allows the device to be put into shutdown mode. Driving the EN pin with a voltage lower than 0.4V disables the device and reduces dramatically the input current consumption (typ 2.1µA), while d riving the EN pin with a voltage higher than 1.2V enables the device. An internal pull-down resistor ensures that the device is disabled also when the EN pin is left floating. The EN pin is also VIN compatible. SOFT-START The 171031801 implements an internal soft-start (see figure below) in order to limit the inrush current and avoid output voltage overshoot during start-up. The soft-start is implemented by ramping the reference voltage (non-inverting input of the error amplifier) from 0V to 0.8V in around 1ms (typical duration of the soft-start). 0,0 1,0 2,0 3,0 4,0 5,0 6,0 0,0 1,0 2,0 3,0 4,0 5,0 6,0 0 1 2 3 4 5 Output Voltage [V] EN pin Voltage [V] Time [ms] Output Voltage at Start Up - VIN = 12V, VOUT = 3.3V ENABLE VOUT tSS VIN EN GND Module 1,2,3,4 VIN GND Jumper to VIN MODULE ENABLED VIN EN GND Module 1,2,3,4 VIN GND Jumper to GND MODULE DISABLED VIN EN GND Module 1,2,3,4 VIN GND No jumper (EN floating) MODULE DISABLED
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 28/49 LIGHT LOAD OPERATION Under light load operation , the device switch from in Continuous Conduction Mode (C CM) to Discontinuous Conduction Mode (DCM). The load current where the transition between DCM and CCM takes place can be estimated using the following formula: IOUT(DCM)= VOUT∙(1-VOUT VIN 2∙fSW∙L (12) The figures below show the device working in CCM and DCM. -0,50 -0,25 0,00 0,25 0,50 0,75 1,00 1,25 1,50 0 2 4 6 8 10 12 Inductor Current [A] Time [µs] Inductor Current Ripple VIN = 12V, VOUT = 3.3V, IOUT = 500mA, CCM Operation 1.2µs → 850kHz -0,50 -0,25 0,00 0,25 0,50 0,75 1,00 0 2 4 6 8 10 12 Inductor Current [A] Time [µs] Inductor Current Ripple VIN = 12V, VOUT = 3.3V, IOUT = 200mA, DCM Operation 1.2µs → 850kHz
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 29/49 If the load current is further reduced, the device decreases the switching frequency in order to limit the energy transferred to the output (to both capacitor and load) and therefore keeping the output voltage regulated. The frequency reduction is shown in the figures below. -0,50 -0,25 0,00 0,25 0,50 0,75 1,00 0 2 4 6 8 10 12 Inductor Current [A] Time [µs] Inductor Current Ripple VIN = 12V, VOUT = 3.3V, IOUT = 40mA, DCM Operation 2.3µs → 440kHz -0,50 -0,25 0,00 0,25 0,50 0,75 1,00 0 2 4 6 8 10 12 Inductor Current [A] Time [µs] Inductor Current Ripple VIN = 12V, VOUT = 3.3V, IOUT = 20mA, DCM Operation 4.6µs → 220kHz
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 30/49 DROPOUT OPERATION The dropout voltage is generally defined as the minimum voltage drop between the input and the output voltages necessary to keep the output voltage regulated. It is usually defined for linear regulators, but it applies also to DC -DC converters when they operate at 100% duty cycle. The 171031801 integrates a p -channel MOSFET as high -side switch. Therefore this module does not need any bootstrap circuitry to create the gate voltage used for driving an n-channel MOSFET. The implementation of a p -channel MOSFET as high-side results in: - there is no minimum off-time, normally necessary to provide the bootstrap circuitry with sufficient voltage - the duty cycle can reach 100%, allowing the output voltage regulation even with a very limited voltage dropout As the input voltage decreases and becomes closer to the output voltage, the duty-cycle rises and reaches then 100%. The voltage dropout in case of 100% duty cycle operation depends fundamentally on the RDSon (resistance of the MOSFET when turned on) of the high-side MOSFET,on the DC resistance of the inductor (DCR) and on the load current. The curve below shows the relation between the dropout voltage and the load current. 100 200 300 400 500 600 700 800 0,00 0,50 1,00 1,50 2,00 2,50 3,00 Dropout voltage [mV] Output current [A] VOUT = 12V, VOUT = 5V Ta = 25°C Ta = 85°C
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 31/49 PROTECTING FEATURES Overcurrent protection (OCP) The overcurrent protection is implemented by sensing the peak current in the high-side power MOSFET during the on-time. When the peak current exceeds the current limit threshold (I CL, see ELECTRICAL SPECIFICATIONS on page 5) the high- side MOSFET is immediately turned off. The current flows through the low -side MOSFET for the remaining time of the period (see figure below). ICL IO UT IO UT_M AX over curr ent e vent IL t During overcurrent condition, the duty cycle is no longer determined by the control loop, it is instead limited by the curren t limit threshold. Therefore, the output voltage is out of regulation and drops (see figure below). If the volt age at the feedback pin falls below 0.3V, the switching frequency (typ. 850kHz) is reduced to one fourth of the default value and the current limit threshold is folded back to 2A. This additional countermeasure prevents the module and the load from being overstressed by a severe overload condition. The overcurrent threshold foldback is inhibited during the startup, hence allowing the output voltage to properly rise even i n case of big output capacitors, which require a high current to be charged. Overcurrent protection Foldback of the current limit Reduced duty cycle operation Reduced fSW operation switch node VOUT IOUT VOUT drops due to the reduced duty cycle operation Normal operation t
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 32/49 Short circuit protection In case of short circuit condition, the module is protected by the current protection mechanism explained in the previous section. Since a short circuit is present at the output, the voltage at the f eedback pin is surely below 0.3V. Therefore the current fold-back and the switching frequency reduction described above will take place after few switching cycles, as shown in the figure below. Short circuit event Current limit threshold VOUT value corresponding to VFB=0.3V Current limit reduced to 2A VOUT IL t Overtemperature protection (OTP) The overtemperature protection helps to prevent catastrophic failures in case of accidental device overheating. The junction temperature of the 171031801 should not be allowed to exceed its maximum rating. Thermal protection is implemented by an internal thermal shutdown circuit which activates at 150°C (typ.) causing the device to stop switching. In this state the V OUT drops and additionally the internal soft -start capacitor is discharged. When the junction temperature falls back below approximately 135°C (typical hysteresis = 15°C) the soft -start circuitry is re -activated, VOUT rises smoothly, and normal operation resumes.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 33/49 DETERMINE POWER LOSSES AND THERMAL REQUIREMENTS OF THE BOARD This section provides an example of estimation of power losses and definition of the thermal performance of the board. As a starting point, the following application conditions can be considered: VIN=12V, VOUT=3.3V, IOUT=3A, TA(MAX) =85 C and TJ(MAX)=125 C where T A is the maximum air temperature surrounding the module and TJ(MAX) is the maximum value of the junction temperature according to the limits in the “OPERATING CONDITIONS” section on page 4. The goal of the calculation is to determine the junction to ambient thermal resistance ( θJA) that can be used to define the characteristics of the PCB on which the device will be mounted. The basic formula for calculating the operating junction temperature TJ of a semiconductor device is as follows: TJ = PLOSS_TOT ∙ θJA + TA (13) PLOSS_TOT are the total power losses within the module and are rela ted to the operating conditions and ƟJA is the junction to ambient thermal resistance, defined as: θJA = θJC + θCA (14) where ƟJC is the junction to case thermal resistance and ƟCA is the case to ambient thermal resistance. From equation (13) the target junction to ambient thermal resistance can be derived: θJA(MAX) < TJ(MAX)-TA(MAX) PLOSS_TOT (15) From the power dissipation´s diagram on page 10 (here below reported) a power loss of 2.35W is read. 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Power Dissipation [W] Output Current [A] Vout = 5V Vout = 3.3V Vout = 2.5V Vout = 1.8V 2.35W
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 34/49 Entering the values in formula (15) results in: θJA(MAX) < 125 C-85 C 2.35W = 17 C/W In order to fulfil the application conditions mentioned above, the PCB should at least provide a junction to ambient thermal resistance of 17°C/W.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 35/49 TYPICAL SCHEMATIC VIN EN GND FB VOUT Module RFBT RFBB 1,2,3,4 9,10,11,12VIN GND GND VOUT Quick setup guide Conditions: TA = 25°C, IOUT = 3A Recommended component values VOUT 12V 9V 5V 3.3V 2.5V 1.8V RFBT 10 kΩ 10 kΩ 10 kΩ 10 kΩ 10 kΩ 10 kΩ RFBB (E96 series) 715Ω 976 1.87kΩ 3.16kΩ 4.64kΩ 7.87kΩ VIN 13V – 18V 10V – 18V 6V – 18V 4.3V – 18V 4V – 18V 4V – 18V
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 36/49 LAYOUT RECOMMENDATION PCB layout is an important part of DC -DC converter design. Poor board layout can disrupt the performance of a DC -DC converter and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop in the traces. These can send erroneous si gnals to the DC -DC converter resulting in poor regulation or instability. A g ood layout can be implemented by following simple design rules. Due to t he integration of both the input and the output capacitor s the user does not need to take care anymore of the switched current loops. The most critical paths, due to discontinuous current flows, are within the module and are already optimized in terms of EMI. VIN VIN FB VOUT Module RFBT RFBBPGND 9,10,11,121,2,3,4 EP VOUT GND GND EN The only external components necessary to operate the 171031801 that must be placed on the PCB are the resistors of the output voltage divider, as shown in the picture above.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 37/49 1: Feedback layout VIN GND GND VOUT 5 6 7 VIN FB RFBTRFBB PGND MagI3C Module Bottom GROUND PLANE 16 15 14 13 PGND PGND PGND VIN VIN VIN VOUT VOUT VOUT VOUT NCNCEN NC NC NC NC PCB color coding: Top layer Bottom layer The resistor divider (RFBT and RFBB) should be located close to the FB pin. Since the FB node is high impedance, the trace thickness should be kept small. The traces from the FB pin to the middle point of the resistor divider should be as short as possible. The upper terminal of the output resistor divider (where the VOUT is applied) should have a short connection to the VOUT pins, where internally are integrated the output capacitors. 2: Ground (PGND) connection of the resistor divider VIN GND GND VOUT 5 6 7 VIN FB RFBTRFBB PGND MagI3C Module Bottom GROUND PLANE 16 15 14 13 PGND PGND PGND VIN VIN VIN VOUT VOUT VOUT VOUT NCNCEN NC NC NC NC The ground connection of the lower resistor of the output voltage divider (RFBB) should be routed to the P GND pins of the device. If not properly handled, poor grounding can result in degraded load regulation or erratic output voltage ripple behavior.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 38/49 3: Make input and output bus connections as wide as possible VIN GND GND VOUT 5 6 7 VIN FB RFBTRFBB PGND MagI3C Module Bottom GROUND PLANE 16 15 14 13 PGND PGND PGND VIN VIN VIN VOUT VOUT VOUT VOUT NCNCEN NC NC NC NC This reduces any voltage drops on the input or output of the converter and maximizes efficiency. 4: Place array of heat-sinking vias Use an array of heat -sinking vias to connect the PGND pad to the ground plane on the bottom PCB layer. If the PCB has multiple of copper layers, these thermal vias can also be used to make a connection to the heat-spreading ground planes located on inner layers. 0.55 0.3 0.762 0.762 All dimension are in mm For best result, use a thermal via array as proposed in the picture above with drill of max 300µm, spaced 762µm apart. Ensure enough copper area is used for heat-sinking, to keep the junction temperature below 125°C. Connecting the NC pins (5,6,7,8) to the the GND layer helps dissipating the heat.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 39/49 5: Isolate high noise areas 5 6 7 VIN FB 16 15 14 13 VIN VIN VIN VOUT VOUT VOUT VOUT NCNCEN NC NC NC NC RFBTRFBB MagI3C Module Bottom GROUND PLANE PGND PGND PGNDPGND Place a dedicated solid ground copper area beneath the MagI³C Power Module.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 40/49 EVALUATION BOARD SCHEMATIC (178031801 v.1.0) VIN EN GND FB VOUT Module RFBT RFBB 1,2,3,4 9,10,11,12 VIN Cf Lf GND C1 C5 VOUT GND Optional input filter optional optional optional optional The 171031801 integrates both the input and output capacitors. Therefore, additional external input/output capacitors are normally not required. The additional 22 0µF aluminum electrolytic capacitor C1 is mounted as termination of the supply line and provides a slight damping of possible oscillations of the series resonance circuit represented by the inductance of the supply line and the input capacitance. The additional MLCC C f is part of the input filter and is not mounted on the board. The inductor Lf is not mounted too (see recommended part number in the table below). A zero ohm resistor (R1) is mounted in parallel with L f. In case the input filter is placed, R1 must be removed and an appropriate Lf mounted. Although the 171031 801 do not need any external output capacitor, in case particular application requirements are demanding additional capacitance , the evaluation board gives the possibility to place further capacitors at the output: C5 (MLCC), C6 (surface mounted electrolytic) and C7 (through hole electrolytic). Bill of Material Designator Description Quantity Order Code Manufacturer IC1 MagI3C Power Module 1 171031801 Würth Elektronik C1 Aluminum electrolytic capacitor, ATG5 family, 220μF/25V 1 860020474012 Würth Elektronik C2 Ceramic chip capacitor (not mounted) optional C5 Ceramic chip capacitor (not mounted) optional C6 Surface mounted electrolytic (not mounted) optional C7 Through hole electrolytic (not mounted) optional Cf Ceramic chip capacitor 10µF/25V X5R, 1206 (not mounted) optional 885012108021 Würth Elektronik Lf Filter inductor, 10µH, PD2 (not mounted) optional 74477510 Würth Elektronik R1 SMD bridge 0Ω resistance 1 RFBT 10kΩ 1 RFBB Set by jumper 715 Ω for VOUT = 12V 1 976 Ω for VOUT = 9V 1 1.87 kΩ for VOUT = 5V 1 3.16 kΩ for VOUT = 3.3V 1 4.64 kΩ for VOUT = 2.5V 1 7.87 kΩ for VOUT = 1.8V 1 For adjustable VOUT: RFBB= RFBT∙0.8V VOUT-0.8V optional J1 Jumper for ENABLE connection to either VIN or GND 1
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 41/49 Filter suggestion for conducted EMI The input filter shown in the schematic below is recommended to achieve conducted compliance according to EN55022 Class B (see results on page 7). For radiated EMI the input filter is not necessary. It is only used to comply with the setup recommended by the norms. VIN Cf Lf GND Input LC Filter VIN GND Power Module Bill of Material of the Input LC Filter Designator Description Order Code Manufacturer Cf Filter ceramic chip capacitor 10μF/25V X5R, 1206 885012108021 Würth Elektronik Lf Filter inductor, 10µH, PD2 family 74477510 Würth Elektronik
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 42/49 HANDLING RECOMMENDATIONS 1. The power module is classified as MSL3 (JEDEC Moisture Sensitivity Level 3) and requires special handling due to moisture sensitivity (JEDEC J-STD033). 2. The parts are delivered in a sealed bag (Moisture Barrier Bags = MBB) and should be processed within one year. 3. When opening the moisture barrier bag check the Humidity Indicator Card (HIC) for color status. Bake parts prior to soldering in case indicator color has changed according to the notes on the card. 4. Parts must be processed after 168 hour (7 days) of floor life. Once this time has been exceeded, bake parts prior to soldering per JEDEC J-STD033 recommendation. SOLDER PROFILE 1. Only Pb-Free assembly is recommended according to JEDEC J-STD020. 2. Measure the peak reflow temperature of the MagI³C power module in the middle of the top view. 3. Ensure that the peak reflow temperature does not exceed 235°C ±5°C as per JEDEC J-STD020. 4. The reflow time period during peak temperature of 235°C ±5°C must not exceed 20 seconds. 5. Reflow time above liquidus (217°C) must not exceed 60 seconds. 6. Maximum ramp up is rate 3°C per second 7. Maximum ramp down rate is 3°C per second 8. Reflow time from room (25°C) to peak must not exceed 8 minutes as per JEDEC J-STD020. 9. Maximum numbers of reflow cycles is two. 10. For minimum risk, solder the module in the last reflow cycle of the PCB production. 11. For soldering process please consider lead material copper (Cu) and lead finish tin (Sn). 12. For solder paste use a standard SAC Alloy such as SAC 305, type 3 or higher. 13. Below profile is valid for convection reflow only 14. Other soldering methods (e.g.vapor phase) are not verified and have to be validated by the customer on his own risk Temperature [°C] Time [sec] 150 200 217 Max 240 Max 90 sec Min 60 sec Max 60 sec Min 40 sec Max 20 sec 235°C Ramp Up Rate Max 3°C/sec Ramp Down Rate Max 3°C/sec Max 2 solder cycles ! Preheat Liquidus Peak
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 43/49 PHYSICAL DIMENSIONS Package type: LGA-16EP All dimensions are in mm
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 44/49 RECOMMENDED LAND PATTERN DESIGN All dimensions are in mm RECOMMENDED SOLDER STENCIL DESIGN All dimensions are in mm
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 45/49 PACKAGING Reel (mm) 20P
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 46/49 Tape (mm)
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 47/49 DOCUMENT HISTORY Revision Date Description Comment
1.0 February 2018 Release of the final version
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 48/49 CAUTIONS AND WARNINGS The following conditions apply to all goods within the product series of MagI³C of Würth Elektronik eiSos GmbH & Co. KG: General: All recommendations according to the general technical specifications of the datasheet have to be complied with. The usage and operation of the product within ambient conditions which probably alloy or harm the component surface has to be avoided. The responsibility for the applicability of customer specific products and use in a particular customer design is always within the authority of the customer. All technical specifications for standard products do also apply for customer specific products. Residual washing varnish agent that is used during the production to clean the application might change the characteris tics of the body, pins or termination. The washing varnish agent could have a negative effect on the long term function of the product. Direct mechanical impact to the product shall be prevented as the material of the body, pins or termination could flake or in the worst case it could break. As these devices are sensitive to electrostatic discharge customer shall follow proper IC Handling Procedures. Customer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory an d safety-related requirements concerning its products, and any use of Würth Elektronik eiSos GmbH & Co. KG components in its applications, notwithstanding any applications-related information or support that may be provided by Würth Elektronik eiSos GmbH & Co. KG. Customer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences lessen the likelihood of failures that might cau se harm and take appropriate remedial actions. Customer will fully indemnify Würth Elektronik eiSos and its representatives against any damages arising out of the use of any Würth Elektronik eiSos GmbH & Co. KG components in safety-critical applications. Product specific: Follow all instructions mentioned in the datasheet, especially: The solder profile has to comply with the technical reflow or wave soldering specification, otherwise this will void the warranty. All products are supposed to be used before the end of the period of 12 months based on the product date-code. Violation of the technical product specifications such as exceeding the absolute maximum ratings will void the warranty. It is also recommended to return the body to the original moisture proof bag and reseal the moisture proof bag again. ESD prevention methods need to be followed for manual handling and processing by machinery.
VDRM – Variable Step Down Regulator Module we-online.com Würth Elektronik eiSos GmbH & Co. KG –Datasheet 1.0 © February 2018 49/49 IMPORTANT NOTES The following conditions apply to all goods within the product range of Würth Elektronik eiSos GmbH & Co. KG: 1. General Customer Responsibility Some goods within the product range of Würth Elektronik eiSos GmbH & Co. KG contain statements regarding general suitability for certain application areas. These statements about suitabili ty are based on our knowledge and experience of typical requirements concerning the areas, serve as general guidance and cannot be estimated as binding statements about the suitability for a customer application. The responsibility for the applicability an d use in a particular customer design is always solely within the authority of the customer. Due to this fact it is up to the customer to evaluate, where appropriate to investigate and decide whether the device with the specific product characteristics des cribed in the product specification is valid and suitable for the respective customer application or not. Accordingly, the customer is cautioned to verify that the datasheet is current before placing orders. 2. Customer Responsibility related to Specific, in particular Safety-Relevant Applications It has to be clearly pointed out that the possibility of a malfunction of electronic components or failure before the end of the usual lifetime cannot be completely eliminated in the current state of the art, eve n if the products are operated within the range of the specifications. In certain customer applications requiring a very high level of safety and especially in custome r applications in which the malfunction or failure of an electronic component could endan ger human life or health it must be ensured by most advanced technological aid of suitable design of the customer application that no injury or damage is caused to third parties in the event of malfunction or failure of an electronic component. 3. Best Care and Attention Any product-specific notes, warnings and cautions must be strictly observed. 4. Customer Support for Product Specifications Some products within the product range may contain substances which are subject to restrictions in certain jurisdi ctions in order to serve specific technical requirements. Necessary information is available on request. In this case the field sales engineer or the internal sales person in charge should be contacted who will be happy to support in this matter. 5. Product R&D Due to constant product improvement product specifications may change from time to time. As a standard reporting procedure of the Product Change Notification (PCN) according to the JEDEC -Standard we inform about minor and major changes. In case of further queries regarding the PCN, the field sales engineer or the internal sales person in charge should be contacted. The basic responsibility of the customer as per Section 1 and 2 remains unaffected. 6. Product Life Cycle Due to technical progress and economical evaluation we also reserve the right to discontinue production and delivery of products. As a standard reporting procedure of the Product Termination Notification (PTN) according to the JEDEC - Standard we will inform at an early stage about inevi table product discontinuance. According to this we cannot guarantee that all products within our product range will always be available. Therefore it needs to be verified with the field sales engineer or the internal sales person in charge about the curren t product availability expectancy before or when the product for application design -in disposal is considered. The approach named above does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. 7. Property Rights All the rights for contractual products produced by Würth Elektronik eiSos GmbH & Co. KG on the basis of ideas, development contracts as well as models or templates that are subject to copyright, patent or commercial protection supplied to the customer will remain with Würth Elektronik eiSos GmbH & Co. KG. Würth Elektronik eiSos GmbH & Co. KG does not warrant or represent that any license, either expressed or implied, is granted under any patent right, copyright, mask work right, or other intel lectual property right relating to any combination, application, or process in which Würth Elektronik eiSos GmbH & Co. KG components or services are used. 8. General Terms and Conditions Unless otherwise agreed in individual contracts, all orders are subject to the current version of the “General Terms and Conditions of Würth Elektronik eiSos Group”, last version available a