MAQ5280 MICREL | Alldatasheet

Document overview

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Technical content

Features

  • Wide Input Voltage Range: 4.5V to 120V DC
  • Very Low Quiescent Current: 31µA typical
  • 25mA guaranteed output current
  • Adjustable Output from 1.215V to 5V
  • DC voltage protection down to -24V
  • Ability to withstand up to +120V DC at the input
  • Stable with ceramic output capacitors
  • Ultra High PSRR > 80dB for RF Applications
  • High output accuracy – ± 2% initial accuracy – ± 3% over temperature (–40°C to +125°C)
  • Thermal shutdown and current limit protection
  • Thermally efficient 8-pin EPAD SOIC package
  • AEC-Q100 qualified

Applications

  • Automotive Systems
  • Industrial Applications
  • Remote Keyless Entry Power Supply
  • Telecom Applications
  • Off-line Power Supplies Typical Application Automotive Application

Micrel, Inc. MAQ5280 October 2008 2 M9999-102708-B

Ordering Information

Part Number Voltage Temperature Range Package Lead Finish MAQ5280YME Adj. –40° to +125°C 8-Pin EPAD SOIC Pb-Free Pin Configuration 1CBYP VOUT ADJ GND

8 VIN

8-Pin EPAD SOIC (ME) Pin Description Pin Number Pin Name Pin Function 1 CBYP Connect 10µF capacitor. Increases PSRR when VIN ≥ 6.5V. 2 VOUT Regulator Output Pin. Conne ct 2.2µF for better stable operation. 3 ADJ Connect pin 3 to external resistor divider to set VOUT. 4 GND Ground. 5 EN Enable pin. Enable Low turns part OFF, Enable High turns part ON. 6, 7 NC Not internally connected. 8 VIN Supply Input pin. Supply (Inp ut): -24V to 120V input voltage. EP – Exposed Pad – Connect to Ground plane trace.

Micrel, Inc. MAQ5280 October 2008 3 M9999-102708-B Absolute Maximum Ratings(1) Operating Ratings(2) Junction Thermal Resistance Electrical Characteristics(5) VIN = 12V; VEN = 2V; COUT = 2.2µF; CBYP = 10µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min Typ Max Units Variation from nominal VOUT –2 +2 % Output Voltage Accuracy Variation from nominal VOUT, –40°C to +125°C –3 +3 % ADJ Pin Voltage 1.219 V Line Regulation(6) ΔVIN = 6.5V to 120V –0.5 0.04 0.5 % Load Regulation(7) IOUT = 100µA to 25mA –0.5 0.2 0.5 % IOUT = 100µA; VIN = 4.5V; Adjust Pin = 0V 0 430 700 mV IOUT = 10mA; VIN = 4.5V; Adjust Pin = 0V 0 800 1000 mV Dropout Voltage IOUT = 25mA; VIN = 4.5V; Adjust Pin = 0V 0 1100 1500 mV IOUT = 100µA 0 31 50 µA Ground Pin Current IOUT = 25mA 0 260 400 µA VEN ≤ 0.3V 0 0.02 1 µA Ground Pin Current in Shutdown VEN ≤ 0.3V, –40°C to +125°C 0 5 µA Ripple Rejection f = up to 1kHz 80 dB VOUT = 0V; VIN = 4.5V 40 70 mA Current Limit VOUT = 0V; VIN = 14.4V 70 100 mA IDD Reverse Battery V IN = –24V; VEN = 0.3V 0.4 0.03 50 µA IOUT Reverse Current V IN = 0V; VOUT = 5V; VEN = 0.3V 3 10 µA ADJ Pin Current 3.3 nA Output Voltage Noise 120 µV RMS Enable Input Logic Low 0.3 V Enable Input Voltage Logic High 2.0 V VEN ≤ 0.3V; VIN = 12V 0 0.02 1 µA VEN ≥ 2.0V; VIN = 12V 0 0.12 1 µA Enable Input Current VIN = 4.5V; VEN = 120V 0 0.15 10 µA Turn-on Time C OUT = 2.2µF; IOUT = 25mA 0.1 1 ms

Micrel, Inc. MAQ5280 October 2008 4 M9999-102708-B Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 5. Specification for packaged product only. 6. Line regulation is a percentage of V OUT. 7. Regulation is measured at constant junction temperature using low duty cycle pulse testing; changes in output voltage due to heating effects are covered by the thermal regulation specification.

Micrel, Inc. MAQ5280 October 2008 5 M9999-102708-B Typical Characteristics 100 120 10 100 1000 10000 100000 FREQUENCY (Hz) Power Supply Rejection Ratio 1mA 100µA 25mA10mA Output Voltage vs. Input Voltage 3.145 3.146 3.147 3.148 3.149 3.150 3.151 3.152 3.153 3.154 3.155 0 40 60 80 100 120 INPUT VOLTAGE (V) VOUT = 3.15V CIN = 0.18µF COUT = 2.2µF Load = 100µA 4.990 4.992 4.994 4.996 4.998 5.000 5.002 5.004 5.006 5.008 5.010 0 5 10 15 20 25 LOAD CURRENT (mA) Output Voltage vs. Load Current EN = V BYP VIN = 12V VOUT = 5V CIN = 0.18µF COUT = 2.2µF 1.215 1.216 1.217 1.218 1.219 1.220 1.221 1.222 1.223 1.224 1.225 Feedback Voltage vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Load=100µA Load=25mA 100 150 200 250 300 0 5 10 15 20 25 OUTPUT CURRENT (mA) Ground Current vs. Output Current VIN = 12V VOUT = 5V CIN = 0.18µF COUT = 2.2µF 120°C –40°C 25°C Ground Current vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) EN = V IN Load = 100µA VIN=120V VIN=12V VIN=4.5V 0.2 0.4 0.6 0.8 1.2 1.4 0 5 10 15 20 25 OUTPUT CURRENT (mA) 1.0 Dropout Voltage vs. Output Current VIN = 4.5V CIN = 0.18µF COUT = 2.2µF 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 Dropout Voltage vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Load=100µA Load=10mA Load=25mA 0 20 40 60 80 100 120 INPUT VOLTAGE (V) VOUT = 3.15V COUT = 2.2µF Current Limit vs. Input Voltage -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) VIN=4.5V VIN=12V Current Limit vs. Temperature 3.10 3.13 3.16 3.19 3.22 3.25 3.28 3.31 3.34 3.37 3.40 Adjust Pin Current vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) VEN = 12V 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 Enable Threshold vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Load = 100µA

Micrel, Inc. MAQ5280 October 2008 6 M9999-102708-B Typical Characteristics (continued) 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 20 40 60 80 100 120 ENABLE VOLTAGE (V) Enable Current vs. Enable Voltage VIN = 12V 0.115 0.117 0.119 0.121 0.123 0.125 0.127 0.129 0.131 0.133 0.135 Enable Current vs. Temperature -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) VIN=12V VIN=120V 0.5 1.5 2.5 3.5 4.5 5.5 6.5 INPUT VOLTAGE (V) Low Voltage Behavior Load=100µA Load=10mA VOUT = 5V COUT = 2.2µF 0 2 44 87 29 6 1 2 0 INPUT VOLTAGE (V) VIN Current vs. Input Voltage VOUT = 1.2V CIN = 0.18µF COUT = 2.2µF IOUT = 0A 0.01 0.1 Output Noise Spectral Density 100 FREQUENCY (Hz) 10 1k 10k 1M 100k VIN = 3.6V VOUT = 3.3V COUT = 2.2µF CBYP = 0.1µF Load = 25mA Noise(10Hz to 100kHz)=113µV RMS

Micrel, Inc. MAQ5280 October 2008 7 M9999-102708-B Functional Characteristics

Micrel, Inc. MAQ5280 October 2008 8 M9999-102708-B Functional Diagram EnableEN EN < EN EN > EN > VIN EN > GND CBYP VOUT ADJEN > 1.22V 1.2V Bypass Regulator Post Regulator

Micrel, Inc. MAQ5280 October 2008 9 M9999-102708-B Functional Description MAQ5280 is a high performance linear regulator which accepts wide input operating range 4.5V to 120V. This allows the use in harsh environments. The input can surge from 0V to 120V within a millisecond. The first stage bypass regulator isolates output from this input by producing an intermediate head voltage which is a input- to-post regulator. This post regulator gives the control to regulate the required output voltage. The output voltage is adjustable from 1.22V to 5V. VIN Pin V IN pin is the supply input pin. A 0.18µF or larger capacitor with proper voltage rating is recommended for filtering the input voltage variations and noise on the input voltage. This capacitor should be close to the V IN and GND pins. CBYP Pin The Bypass pin is the output of the Bypass regulator and the input of the post regulator. By connecting a capacitor from the CBYP pin-to-GND, a greater stability and a much higher PSRR is achieved. A 10µF ceramic capacitor is recommended and this significantly decreases V OUT noise and perturbations due to line transients. When the MAQ5280 is enabled, the Bypass pin voltage is regulated at 5.5V. To maintain 5.5V regulation and high PSRR, the V IN must be no lower than 6.5V. For V IN less than 6.5V while in dropout, the PSRR is reduced. EN Pin EN pin is a logic level enable input which turns MAQ5280 on/off. Drive EN pin level high to turn the device ON and drive EN pin low to keep the device in shutdown mode. In shutdown mode the MAQ5280 draws typically 20nA from the input supply. EN pin can withstand 120V, allowing EN always connected to input supply for always-ON operation. ADJ Pin ADJ pin gives the flexibility to set the output voltage to the requirement from 1.22V to 5V. Use a resistor divider from output and connect to ADJ pin, internal reference is typically 1.219V. GND Pin This GND pin provides the ground for all the electrical connections. MAQ5280 has exposed pad underneath the package which should be connected to ground. If this exposed pad is connected to wide ground plane it would improve the thermal performance of MAQ5280. NC Pins There are two NC pins on the package which are not connected internally. VOUT Pin The V OUT pin is the regulated output of the post regulator. When the MAQ5280 is enabled, V OUT regulates at a fixed voltage, when disabled, V OUT is high impedance. A 2.2µF or larger ceramic capacitor must be connected to V OUT pin-to-ground.

Micrel, Inc. MAQ5280 October 2008 10 M9999-102708-B

Application Information

MAQ5280 is a linear regulator with a wide operating range of input voltage 4.5V to 120V. The input can go down to –24V without any damage to the device. This feature gives the advantage to use in harsh environment applications such as automotive load dump and remote keyless entry as well as telecom applications. Thermal Protection MAQ5280 has internal thermal shutdown to protect from over dissipation and failure. When the junction temperature exceeds +160°C, an internal thermal sensor signals the shutdown logic to turn off the pass transistor and allows the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 10°C. This results in a cycled output during continuous thermal overload conditions. The recovery from thermal shutdown is smooth without any overshoot. For continuous operation, do not exceed the maximum junction temperature rating of +125°C. Current Limit MAQ5280 has a current limit protection to protect it from over loads. The recovery from current limit protection is smooth without any oversh oots. The output can be shorted to GND for an indefinite period of time without damage to the device. During a short circuit, the power dissipated across the pass transistor can quickly heat the device. When the die temperature reaches +160°C, the MAQ5280 shut down and automatically restart after the die temperature cools by 10°C. This results in a pulsed output operation. CBYP Output when Enable is Low When the Enable is low and the MAQ5280 is disabled, while V IN voltage is present, the CBYP pin voltage is typically 4.5V, even for VIN as high as 120V. The Bypass regulator although maintaining the Bypass voltage, requires no current from V IN other than leakage current. Bypass Capacitor A 10µF capacitor should be connected from bypass pin to ground to maintain stability of the bypass regulator. The voltage rating of the capacitor must be 8V or higher. Low ESR ceramic capacitors work well. Although a 1µF capacitor maintains good AC power supply rejection, higher capacitance values will enhance AC power supply rejection. PSRR Power Supply Rejection Ratio is the measure of a V OUT signal caused by a signal on the V IN pin. The ratio of VIN/VOUT in dB is PSRR. The MAQ5280’s PSRR from 0Hz to 1kHz exceeds 80dB. Output Voltage Setting For adjustable regulator, V OUT is programmable from 1.22V to 5.0V. A 2.2µF or larger capacitor must be connected to V OUT pin-to-ground to maintain stability. This capacitor value can be increased without bound. The V OUT capacitor can have an ESR of 0 Ω. When VIN is lower than V OUT, VOUT is not pulled low by V IN. A small current, typically 4µA, will sink into VOUT pin. The output voltage is controlled by the feedback resistors (R1 and R2) and can be calculated as follows: ⎛ +⋅= 12 R RVV REFOUT VREF = 1.219V The evaluation board is initially adjusted to 5V, but can easily be modified by removing R1 and replacing it with the value that yields the desired output voltage. ⎛ −⋅= 121 REF OUT V VRR Ensure the output voltage selected does not exceed 5V. Enable Pin The voltage on enable pin EN of MAQ5280 could vary from –1V to 120V. So enable pin EN of MAQ5280 can be used in a different configuration as the application dictates. If the MAQ5280 needs to be always enabled then simply connect the EN pin to CBYP pin, as shown in Figure 1. Then whenever V IN has a supply voltage output is developed. Input can swing from –24V to 120V. One can also connect EN pin through 100k Ω resistor to input as shown in Figure 2 to achieve the same result.

Micrel, Inc. MAQ5280 October 2008 12 M9999-102708-B Bill of Materials Item Part Number Manufacturer Description Qty. NMC-P1210X7R184K200TRPLPF NIC (1) Capacitor, 0.18µF, 200V, Size 1210 C1812C184K2RAC Kemet (2) C1 VJ1812Y184KXC Vishay (3) Capacitor, 0.18µF, 200V, Size 1812 C1608X5R1A225K TDK (4) Capacitor, 2.2µF,10V, X5R, Size 0603 0603C225MAT AVX (5) Capacitor, 2.2µF,6.3V, X7R, Size 0603 C2 GRM188R60J225KE19D Murata (6) Capacitor, 2.2µF,6.3V, X5R, Size 0603 C1608X5R0J105K TDK (4) VJ0603G105KXYPW1BC Vishay (3) C3 GRM188R60J105KA01D Murata (6) Capacitor, 1µF,6.3V, X5R, Size 0603 1 R1 CRCW060315R4FKEYE3 Vishay (3) Resistor, 15.4k, 1%, 1/16W, Size 0603 1 R2 CRCW06034R87FKEYE3 Vishay (3) Resistor, 4.8k, 1%, 1/16W, Size 0603 1 U1 MAQ5280YME Micrel, Inc. (7) 25mA, 120V, Low I Q, High PSRR LDO 1 Notes: 1. NIC: www.nic.com 2. Kemet Electronics: www.ketem.com 3. Vishay: www.vishay.com 4. TDK: www.tdk.com 5. AVX: www.avx.com 6. Murata: www.murata.com 7. Micrel, Inc.: www.micrel.com

Micrel, Inc. MAQ5280 October 2008 13 M9999-102708-B PCB Layout Recommendations Top Layer Bottom Layer

Micrel, Inc. MAQ5280 October 2008 14 M9999-102708-B

Package Information

8-Pin EPAD SOIC (ME) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2008 Micrel, Incorporated.