171960501

Wurth Elektronik GmbH &...

Variable Step Down MicroModule

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WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 1/36

DESCRIPTION

The VDMM 171960501 MagI3C MicroModule provides a fully integrated DC -DC power supply including the switching regulator with integrated MOSFETs , compensation and shielded inductor in one package. The 171960501 offers high efficiency and de livers up to 0.6A of output current. It operates with an input voltage from 2.7V to 5.5V and is designed for small solution size. The selectable forced PWM or PFM/PWM mode allows for the choice between high efficiency and low output voltage ripple at light load. It is available in an LGA-6EP package (3.2 x 2.5 x 1.6mm). This module has integrated protection circuitry that guards against thermal ov erstress with thermal shutdown and protects against electrical damage using overcurrent, short-circuit and undervoltage protections. TYPICAL APPLICATIONS  General point of load power supply for low power systems  Replacement of linear regulators  DSP and FPGA power supply auxiliary voltages  Portable instruments  Battery powered equipment TYPICAL CIRCUIT DIAGRAM

FEATURES

 Peak efficiency up to 96%  Current capability up to 0.6A  Input voltage range: 2.7V to 5.5V  Output voltage range: 0.6V to 5.5V  30 µA typical quiescent current  Integrated shielded inductor and input and output capacitors (partially)  Low output voltage ripple: <2mV typ.  Output voltage accuracy over temperature: 2% max.  Fixed switching frequency: 2.25 MHz  Voltage Mode control  Synchronous operation  Selectable forced PWM or PFM/PWM mode  Undervoltage lockout protection (UVLO)  Embedded soft-start  Thermal shutdown  Short-circuit protection  Cycle-by-cycle current limit  RoHS und REACh compliant  Operating ambient temperature up to 85°C  No output current derating within the operating temperature range  Operating junction temp. range: -40 to 125°C  Complies with EN55022 class B radiated emissions standard VIN VOUT EN MODE CIN COUT RFBT FB PGND VIN VOUT RFBB CFF GND GND PGND EP

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 2/36 PACKAGE Top View Bottom view MARKING DESCRIPTION Marking Description Y Year W Calendar week L Lot number x Product Code zz Voltage Code PIN DESCRIPTION SYMBOL NUMBER TYPE DESCRIPTION VOUT 1 Power Output voltage. Place output capacitors as close as possible. For best thermal performance use copper plane(s) at this pin. MODE 2 Input Forced PWM or PFM/PWM mode selection pin. Setting this pin high, the forced PWM mode is selected for any load current. Setting this pin low, PFM/PWM is selected, with the transition automatically between the two operations according to the load. This pin must not be left floating. FB 3 Input Feedback pin. This pin must be connected to the external resistor divider (between VOUT and GND) to adjust the output voltage. VIN 4 Power Input voltage. Place the input capacitor as close as possible. EN 5 Input Enable pin. Setting this pin high enables the device, while setting this pin low shuts down the device. This pin must not be left floating. PGND 6 Power Power Ground. It must be connected to the ground plane and the Thermal Pads. PGND EP Exposed Pads Exposed Pads. These pins are internally electrically connected to PGND. It is recommended to connect them to the ground plane for device heat dissipation Y W L x z z VIN EN PGND VOUT MODE FB VIN EN PGND VOUT MODE FB PGND EP PGND EP PGND EP PGND EP

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 3/36

ORDERING INFORMATION

ORDER CODE PART DESCRIPTION SPECIFICATIONS PACKAGE PACKAGING UNIT 171960501 WPMDB1960501XF 0.6A / 0.6-5.5Vout version LGA-6EP Reel (2000 pieces) 178960501 - 0.6A / 0.6-5.5Vout version Eval Board 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

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 4/36 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 6 V VOUT Output voltage -0.3 VIN V FB Feedback pin -0.3 VIN V EN Enable pin -0.3 VIN +0.3 V MODE Mode pin -0.3 VIN V Tstorage Assembled, non-operating storage temperature -65 150 °C VESD ESD voltage (HBM), all pins (C=100pF, R= 1.5kΩ) -2 2 kV OPERATING CONDITIONS Operating conditions are conditions under which the device is intended to be functional. All values are referenced to GND. MIN and MAX limits are valid for the recommended ambient temperature range of -40°C to 85°C. Typical values represent statistically the utmost probable values at the following conditions: VIN = 5V, VOUT = 1.8V, CIN = COUT =10µF ceramic, unless otherwise noted. SYMBOL PARAMETER MIN (1) TYP (2) MAX (1) UNIT VIN Input voltage 2.7 - 5.5 V VOUT Output voltage (depending on the external resistor divider) 0.6 - 5.5 V TA Ambient temperature range -40 - 85 (3) °C TJOP Junction temperature range -40 - 125 °C IOUT Nominal output current 0.6 A THERMAL SPECIFICATIONS SYMBOL PARAMETER TYP (2) UNIT ӨJA Junction-to-ambient thermal resistance (4) 150 °C/W TSD Thermal shutdown, rising 150 °C Thermal shutdown hysteresis, falling 20 °C

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 5/36 ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended ambient temperature range of -40°C to 85°C. Typical values represents statistically the utmost probable values at the following conditions: VIN = 5V, VOUT = 1.8V, CIN = COUT =10µF ceramic, unless otherwise noted. SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (2) MAX (1) UNIT Output current IOCP Overcurrent protection TA = 25°C 1 2.4 - A Output accuracy VFB Reference voltage TA = 25°C 0.594 0.6 0.606 V Temperature variation -40°C ≤ TA ≤ 85°C 0.588 0.6 0.612 V IFB Input current feedback pin -100 - 100 nA VOUT Line regulation VIN = 2.7V to 5V, TA = 25°C, MODE = high - ±0.2 - %/V Load regulation VIN = 2.7V, VOUT = 1.8V over IOUT range, MODE = high, TA = 25°C - ±0.5 - %/A Output voltage ripple VIN = 3.6V, VOUT = 1.8V, IOUT = 600mA MODE = high, 20MHz BW, TA = 25°C(5) - 1 - mV VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA MODE = low, 20MHz BW, TA = 25°C(5) - 30 - mV Switching frequency fSW Switching frequency 1.65 2.25 2.76 MHz Enable and undervoltage lockout VUVLO VIN undervoltage threshold VIN increasing - 2.15 2.3 V VIN undervoltage hysteresis TA = 25°C - 0.15 - V VENABLE Enable threshold Enable logic high voltage 2 - - V Enable logic low voltage 0 - 0.3 V IENABLE Enable input current -500 - 500 nA MODE selection VMODE MODE threshold high TA = 25°C VIN-0.5 - - V MODE threshold low TA = 25°C 0 - 0.3 V IMODE MODE current consumption MODE = high, TA = 25°C 30 nA MODE = low, TA = 25°C -40 nA Soft-Start TSS Soft-start duration TA = 25°C (10%-90% of VOUT) 550 µs

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 6/36 ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended ambient temperature range of -40°C to 85°C. Typical values represents statistically the utmost probable values at the following conditions: VIN = 5V, VOUT = 1.8V, CIN = COUT =10µF ceramic, unless otherwise noted. SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (2) MAX (1) UNIT Efficiency η Efficiency VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA MODE = low - 90 - % VIN = 5V, VOUT = 3.3V, IOUT = 50mA MODE = low - 90 - % VIN = 3.6V, VOUT = 1.8V, IOUT = 200mA, MODE = high - 91 - % VIN = 5V, VOUT = 3.3V, IOUT = 200mA, MODE = high - 93 - % VIN = 3.6V, VOUT = 3.3V, IOUT = 200mA, MODE = high - 96 - % Input quiescent/shutdown current ISD Shutdown quiescent current VENABLE = 0V TA = 25°C - 0.1 1 µA IIN No load input current MODE = high, EN = high, switching with no load, VOUT = 1.8V, TA = 25°C - 6 - mA MODE = low, EN = high, switching with no load, VOUT = 1.8V, TA = 25°C - 3 - mA IQ Quiescent current MODE = low, EN = high no switching, TA = 25°C - 30 - µA 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, Authorization and Restriction of Chemicals (REACh). PACKAGE SPECIFICATIONS Weight Molding compound UL class Certificate number 0.047g None Not applicable Not applicable

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 7/36 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) Typical numbers are valid at 25°C ambient temperature and represent statistically the utmost probable values assuming a Gaussian distribution. (3) Depending on heat sink design, number of PCB layers, copper thickness and air flow. (4) Measured on a 101.5 x 114.5 mm one layer board, with 70µm (2 ounce) copper, no air flow, according to JESD51-9. (5) The industry stand ard for comparison of the output voltage ripple between switching regulators or modules requires a 10µF ceramic (sometimes additional 1µF ceramic in parallel) at the point of load where the voltage measurement is done using an oscilloscope with its probe a nd probe jack designed for low voltage/high frequency (low impedance) measurement. The oscilloscopes bandwidth is limited at 20MHz.

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 8/36 TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: V IN = 5V; C IN = 10µF X7R ceramic; C OUT = 10µF X7R ceramic, CFF = 22pF, TAMB = 25°C. RADIATED EMISSIONS EN55022 (CISPR-22) CLASS B COMPLIANT Measured with module on Eval Board 178960501 at 3m antenna distance. 30 100 1000 Frequency [MHz] Radiated Emissions [dBµV/m] Radiated Emissions 171960501 (3m Antenna Distance ) VIN = 5V, VOUT = 3.3V, ILOAD = 600mA Input pi- filter: 10µF, 2.2µH (74438343022) and 10µF Horizontal Vertical EN55022 Class A limit EN55022 Class B limit The diagram above refers only to forced PWM mode. Nevertheless similar results would be obtained in PFM/PWM mode because at this load current (600mA) there is no difference between the two modes.

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 9/36 EFFICIENCY 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A]

171960501 VIN = 5V, Forced PWM Mode, TA = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A]

171960501 VIN = 5V, PFM/PWM Mode, TA = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 10/36 EFFICIENCY 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A] 171960501 VIN = 3.6V, Forced PWM Mode, TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A] 171960501 VIN = 3.6V, PFM/PWM Mode, TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 11/36 EFFICIENCY 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A] 171960501 VIN = 3.3V, Forced PWM Mode, TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Efficiency [%] Output Current [A] 171960501 VIN = 3.3V, PFM/PWM Mode, TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 12/36 POWER DISSIPATION 100 150 200 250 0 0,1 0,2 0,3 0,4 0,5 0,6 Power Dissipation [mW] Output Current [A] Vout =3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 150 200 250 Power Dissipation [mW] Output Current [A] Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 13/36 POWER CONSUMPTION 100 150 200 250 0 0,1 0,2 0,3 0,4 0,5 0,6 Power Dissipation [mW] Output Current [A] 171960501 VIN = 3.6V, Forced PWM Mode, TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 150 200 250 Power Dissipation [mW] Output Current [A] 171960501 VIN = 3.6V, PFM/PWM Mode, TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 14/36 POWER CONSUMPTION 100 150 200 250 0 0,1 0,2 0,3 0,4 0,5 0,6 Power Dissipation [mW] Output Current [A] 171960501 VIN = 3.3V, Forced PWM Mode, TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 150 200 250 Power Dissipation [mW] Output Current [A] 171960501 VIN = 3.3V, PFM/PWM Mode, TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 15/36 OUTPUT POWER DERATING Note : see TA limits in Operating Conditions on page 4. 0,0 0,2 0,4 0,6 0,8 1,0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C]

171960501 Current Thermal Derating

VIN = 3.6V, VOUT = 1.8V, PFM/PWM Mode, θJA = 150 C/W

98 C 125 C

0,0 0,2 0,4 0,6 0,8 1,0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C] VIN = 5V, VOUT = 3.3V, PFM/PWM Mode, θJA = 150 C/W

99 C 125 C

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 16/36 LOAD REGULATION LINE REGULATION 1,75 1,76 1,77 1,78 1,79 1,80 1,81 1,82 1,83 1,84 1,85 0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 Output Voltage [V] Output Current [A] VIN = 3.6V, VOUT = 1.8V, TA = 25 C PFM/PWM Mode Forced PWM Mode Forced PWM Mode PFM/PWM Mode 1,75 1,76 1,77 1,78 1,79 1,80 1,81 1,82 1,83 1,84 1,85 Output Voltage [V] Input Voltage [V] VOUT = 1.8V, IOUT = 600mA, TA = 25 C PFM/PWM Mode Forced PWM Mode

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 17/36 BLOCK DIAGRAM SSSS VREF 0.6V SSOTP EA PWM Controller Driver Protections Compensation network VIN MODE PGND EN FB VOUT4 6 5 12µH 1µF1µF CIN COUT CFFRFBT RFBB VIN SSUVLO PGND EP CIRCUIT DESCRIPTION The MagI³C MicroModule 171960501 is based on a synchronous step down regulator with integrated MOSFETs and a power inductor. The control scheme is based on a Voltage Mode (VM) regulation loop. Through the external resistor divider, a voltage proportional to V OUT is fed to the FB pin of the MicroModule. This voltage is then compared with an internal reference (0.6V). The signal resulting from this comparison is then used to drive the two power MOSFETs in accordance with the status of the MODE pin. When the Forced PWM mode is selected the switching frequency always remains constant at 2.25 MHz.

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 18/36 DESIGN FLOW The next four simple steps will show how to select the external components to design the 171960501 application. Essential Steps 1. Set output voltage 2. Select input capacitor 3. Select output capacitor 4. Select the feed-forward capacitor VIN VOUT EN MODE CIN COUT RFBT FB PGND VIN VOUT RFBB CFF 2 3 GND GND PGND EP

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 19/36 Step 1 Setting the output voltage (VOUT) The output voltage is selected with a n external resistor divider between VOUT and GND (see circuit below) . The voltage across the lower resistor of the divider is provided to the FB pin. The output voltage adjustment range is from 0.6V to 5.5V. The output voltage can be calculated according to the following formula: VOUT = VFB ∙ (RFBT RFBB + 1) One resistor must be chosen and then the other resistor can be calculated. For example, if RFBT = 100kΩ then the resistance value of the lower resistor in the feedback network is indicated in the table below for common output voltages. VOUT PGND RFBB VOUT FB RFBT

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 20/36 Step 2 Select input capacitor (CIN) The energy at the input of the MicroM odule is stored in the input capacitor. A n input capacitor (1µF) is integrated inside the 171960501 MagI³C MicroModule, ensuring good EMI performance and helping protect against possible voltage spikes . Additional input capacitance is required externally to provide cycle-by-cycle switch current and to support load transients. The external input capacitor must be placed directly at the VIN pin. For this MagI³C MicroModule it is recommended to use a MLCC (Mutli Layer Ceramic Capacitor) of 10µF. Attention must be paid to the voltage and temperature deratings of the selected capacitor. Step 3 Select output capacitor (COUT) The output capacitor should be selected in order to minimize the output voltage ripple and to provide a stable voltage at the output. It also affects the loop stability. An output capacitor of 1µF is integrated inside the 171960501 MagI³C MicroModule. An external MLCC of 10µF is recommended for all application conditions. A ttention must be paid to the voltage and temperature deratings of the selected capacitor. In general, the output voltage ripple can be calculated using the following equation: VOUT ripple = ∆IL ∙ ESR+∆IL ∙ 1 8∙fSW∙COUT (1) where ∆IL is the inductor current ripple and can be calculated with the following equation: ∆IL= VOUT ∙ (VIN-VOUT) fSW ∙ L ∙ VIN (2) Example In the section OUTPUT VOLTAGE RIPPLE on page 25 a ripple measurement is shown under the following conditions: VIN = 3.6V VOUT = 1.8V L = 2µH fSW = 2.25MHz COUT = 10µF (external, Würth Elektronik, part number 885012107014) + 1µF (internal) = 11µF Assuming a reduction of the capacitance of about 10% due to the bias voltage, a remaining capacitance of around 10µF can be considered. Another assumption can be done for the ESR, which can be considered lower than 5mΩ. Using equations (1) and (2), the expected ripple is VOUT ripple ≤ 2mV, which matches the results obtained with the measurement.

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 21/36 Step 4 Select the feed-forward capacitor (CFF) For the 171960501 MagI³C Micro Module a feedforward capacitor CFF is normally recommended to improve the stability and to broaden the bandwidth, which leads to a faster load transient response. A value of 22pF has been practically evaluated as the best performing. The pictures below show the load transient response of the 171960501 to a load transition from no load to f ull load using the recommended CFF = 22pF as well as higher values of CFF. A higher value of CFF helps to reduce the overshoot and undershoot just after the current step and provide a faster reaction to the load transient. -150 -100 -50 100 150 -1,0 -0,8 -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 1,0 0 10 20 30 40 50 60 Output voltage AC [mV] Output current [A] Time [µs] Load Transient VIN = 3.6V, VOUT = 1.8V, from 0A to 600mA, TA = 25 C IOUT VOUT CFF = 22pF CFF = 47pF CFF = 100pF CFF = 220pF -150 -100 -50 100 150 -1,0 -0,8 -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 1,0 0 10 20 30 40 50 60 70 80 Output voltage AC [mV] Output current [A] Time [µs] Load Transient VIN = 3.6V, VOUT = 1.8V, from 600mA to 0A, TA = 25 C IOUT VOUT CFF = 22pF CFF = 47pF CFF = 100pF CFF = 220pF

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 22/36 The use of a higher value of CFF not only influences the load transient response but also affects the efficiency under light load conditions when the PFM/PWM mode is selected. As explained in the section LIGHT LOAD OPERATION on page 23, under light load operation and PFM/PWM Mode, the device does not continuously switch, instead delivering energy to the load in bursts. The frequency of those bursts is influenced by the value of CFF (see below), among other parameters (more details in the dedicated section). Increasing CFF will cause the module to burst more often resulting in a decrease in efficiency, as depicted in the diagram below. A trade-off between load step response and efficiency should be considered while selecting the most suitable value for CFF. 0 4 8 12 16 20 24 Switch Node Voltage [V] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, CFF = 22pF PFM Mode 9µs → 110kHz 100 0,001 0,01 0,1 Efficiency Output Current [A] VIN = 3.6V, VOUT = 1.8V, TA = 25°C Cff = 220pF Cff = 22pF 0 4 8 12 16 20 24 Switch Node Voltage [V] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, CFF = 220pF PFM Mode 6.5µs → 150kHz

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 23/36 LIGHT LOAD OPERATION Under light load conditions the 171960501 behaves differently according to the MODE pin setting. Forced PWM mode Pulling the MODE pin high selects the forced PWM mode. In this mode the device constantly functions in PWM mode, switching at the default 2.25 MHz fixed switching frequency, independently of the load (see figure below). This mode of operation eases the filtering requirements to help with noise sensitive applications. PFM/PWM mode Setting the MODE pin low selects the PFM/PWM mode. This mode achieves a much higher efficiency at light loads (normally below 100mA), as shown in the picture below. -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 0 2 4 6 8 10 12 Inductor current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA, forced PWM mode fSW = 2.25MHz 100 0,001 0,01 0,1 Efficiency [%] Output Current [A] 171960501 VIN = 3.6V, VOUT = 1.8V, PFM vs Forced PWM Mode, TA = 25 C PFM/PWM Mode Forced PWM Mode

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 24/36 In PFM/PWM mode the energy is delivered in bursts to the load (see figure below). Within each burst the device switches at the default switching frequency and the energy is delivered to both the load and the output capacitor. Between two bursts, the device does not switc h (the load demand is supported by the output capacitor) and the current consumption is significantly reduced, leading to higher efficiency compared to the forced PWM mode. The frequency of the bursts (fburst) depends on the load and it is much lower than the default switching frequency (see picture below at two different load conditions). When the load current is above 100mA, the transition from the PFM mode to the PWM mode takes place automatically. Please consider that the burst frequency f burst can differ from the example measurements above depending on several parameters (e.g. COUT, CFF, etc.). -200 -100 100 200 300 400 500 0 2 4 6 8 10 12 14 16 18 20 22 24 Inductor current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA, PFM/PWM mode fSW = 2.25MHz fburst ≈ 170kHz -200 -100 100 200 300 400 500 0 2 4 6 8 10 12 14 16 18 20 22 24 Inductor current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, PFM/PWM mode fSW = 2.25MHz fburst ≈ 145kHz

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 25/36 OUTPUT VOLTAGE RIPPLE The output voltage ripple is also influenced by the selection of the MODE pin. If the forced PWM mode is selected, the rippl e is very low and it always has the same frequency as the internal oscillator (2.25 MHz). If the PFM/PWM mode is selected, the output voltage ripple is higher and the frequency is lower than the nominal switching frequency (see pictures below). Ripple in forced PWM mode Ripple in PFM/PWM mode Output Voltage Ripple [mV] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 600mA, COUT = 10µF Forced PWM Mode 1mV fSW = 2.25 MHz -50 -40 -30 -20 -10 0 5 10 15 20 25 30 Output Voltage Ripple [mV] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, COUT = 10µF PFM Mode 30mV fSW = 2.25 MHz fburst ≈ 160 kHz

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 26/36 PROTECTIVE FEATURES Overcurrent protection (OCP) For protection against load faults, the MagI³C MicroModule incorporates cycle-by-cycle current limiting (see IOCP in “Electrical Specification” on page 5). During an overcurrent condition the output current is limited and the output voltage drops (see figure below). When the overcurrent condition is removed, the output voltage returns to the nominal voltage. Short-circuit protection (SCP) When the MagI³C MicroModule experiences a short -circuit condition, it enters a hiccup mode. The MagI³C MicroModule reduces the current limit threshold to around 1.5A (typ.) and switches off when this threshold is reached. After that it stays off for a few hundred microseconds and then switches on again with a soft-start. As long as the short-circuit is not cleared, these cycles will continue to repeat (see figure below). 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 -2,0 -1,0 0,0 1,0 2,0 3,0 4,0 0 1 2 3 4 5 6 7 8 9 10 11 12 Output Current [A] Output Voltage [V] Time [ms] VIN = 3.6V, VOUT = 1.8V Current limit Output voltage drop 0,0 0,5 1,0 1,5 2,0 0 200 400 600 800 1.000 Inductor Current [A] Time [µs] short circuit detection MagI³C MicroModule off Switch on with Soft-Start

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 27/36 Over temperature protection (OTP) Thermal protection helps prevent catastrophic failu res due to accidental device overheating. The junction temperature of the MagI³C MicroModule should not be allowed to exceed its maximum ratings. Thermal protection is implemented by an internal thermal shutdown circuit, which activates when the junction temperature reaches 150°C (typ). Under the thermal shutdown condition both MOSFETs remain off causing VOUT to drop. When the junction temperature falls below 130°C the internal soft- start is released, VOUT rises smoothly, and normal operation resumes. Input undervoltage lockout The device incorporates undervoltage l ockout (UVLO) to protect unexpected behavior at input voltages below the recommended values. The thresholds of the UVLO are indicated in the Electrical Specifications on page 5. Soft-Start The 171960501 implements an internal soft-start in order to limit the inrush current and avoid output voltage overshoot during start-up. The typical duration of the soft-start is around 550µs (see figure below). Enable The 171960501 MagI³C MicroModule is enabled by setting the pin EN high. After setting EN high, the soft-start takes place. The EN pin can be also used to implement power sequencing in systems with various modules, for example connecting the output voltage of another module to the EN pin. 0 1 2 3 4 5 6 VEN , VOUT [V] Time [ms] tSS

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 28/36 LAYOUT RECOMMENDATION CIN COUT CFF RFBT RFBB PGND EN VIN FB MODE VOUTGND VIN VOUT GND MagI³C Power Module Bottom GROUND PLANE Bottom layer Top layer Pads The picture above shows a possible layout for the 171960501 MagI 3C MicroModule. Nevertheless some recommendation should be followed when a layout is designed: 1. The exposed pads are connected through nine thermal vias to a bottom copper layer for heat dissipation. This copper layer must be not connected with the input GND track nearby the module as this would result in partially bypassing high frequency ripple currents from the input capacitor and generating more EMI. 2. The input and output capacitors should be placed as close as possible to the VIN and VOUT pins of the device. 3. The feedback resistor divider should be placed as close as possible to the FB pin 4. Pins 5 and 2 (EN and MODE respectively) must be always connected to either VIN or ground and they cannot be left floating (an example is shown in the layout depicted above, where EN and MODE pins are respectively connected to VIN and ground).

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 29/36 EVALUATION BOARD SCHEMATIC VIN VOUT EN MODEC1 C3 RFBT FB PGND VIN VOUT RFBB CFF GND GND PGND EP Operational Requirements The additional aluminum polymer capacitor C1 is only for evaluation board protection purpose s. It is mounted as the 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 Bill of Material Designator Description Quantity Order Code Manufacturer IC1 MagI3C MicroModule 1 171960501 Würth Elektronik C1 Aluminum Polymer Capacitor 220µF/10V 1 875105244013 Würth Elektronik C2,C3 Ceramic chip capacitor 10µF/16V X5R, 0805 2 885012107014 Würth Elektronik CFF Ceramic chip capacitor 22pF/25V NP0/COG 0603 1 RFBT 24.9 kΩ 1 RFBB Set by jumper open for VOUT = 0.6V 36.5 kΩ for VOUT = 1.0V 1 24.9 kΩ for VOUT = 1.2V 1 16.5 kΩ for VOUT = 1.5V 1 12.4 kΩ for VOUT = 1.8V 1 7.68 kΩ for VOUT = 2.5V 1 5.36 kΩ for VOUT = 3.3V 1 To be soldered for adjustable output voltage RFBB= RFBT VOUT VFB - 1 J1 Jumper for MODE connection to either VIN (Forced PWM) or GND (PFM/PWM) 1 J2 Jumper for EN connection to either VIN (device enabled) or GND (device disabled) 1

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 30/36 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 MicroModule 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 90 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 three. 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). / 89%) type 3 or higher. 13. The profile shown below 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 at their own risk. Temperature [°C] Time [sec] 150 180 217 Max 240 Max 90 sec Min 60 sec Max 90 sec Min 60 sec Max 20 sec 230°C Ramp Up Rate Ramp Down Rate Max 3 solder cycles ! Preheat Liquidus Peak Max 3°C/sec Max 3°C/sec

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 31/36 PHYSICAL DIMENSIONS Bottom view All dimensions in mm, tolerances ±0.1mm All dimensions in mm

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 32/36 EXAMPLE FOOTPRINT DESIGN All dimensions in mm

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 33/36 PACKAGING Reel (mm) 20P A B C D N W1 W2 W3

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 34/36 Tape (mm) A0 B0 W P1 T T1 T2 D0 E1 E2 F P0 P2 Tape Packaging Unit

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 35/36 DOCUMENT HISTORY Revision Date Description Comment

1.0 November 2017 Datasheet Release

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 data-sheet 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 characteristics 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 and 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 cause harm and take appropriate remedial actions. Customer will fully indemnify Würth Elektronik eiSos and its representatives against any damages arising out of th e 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 sp ecification, 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.

WPMDB1960501XF / 171960501 MagI3C Power Module VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © November 2017 36/36 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 regardin g general suitability for certain application areas. These statements about suitability 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 and 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 described 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, even 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 customer applications in which the malfunction or failure of an electronic component could endanger 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 jurisdictions 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 inevitable 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 current 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 intellectual 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 at www.we-online.com.

Product Information

171960501 specifications and overview.

Summary

Variable Step Down MicroModule

Description

Variable Step Down MicroModule

Source title 171960501 Datasheet(PDF) - Wurth Elektronik GmbH & Co. KG, Germany.

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