MP8904 500mA Linear Regulator The Future of Analog IC Technology DESCRIPTION FEATURES The MP8904 is a low-current, low-dropout, linear regulator that operates on a single 2.5Vto-6.5V input supply. An external resistor controls the output voltage. The MP8904 can supply up to 500mA of load current. The enable pin (EN) allows the part to enter a low-current shutdown mode (EN=0). The MP8904 features thermal overload and current limit protection. It is available in an 8-pin QFN (2×3mm) package. Power-Good Open Collector Output Operates from a 2.5V-to-6.5V Input Low 300mV Dropout at 500mA Output Stable with Very Small Ceramic Capacitors 2% Feedback Reference Adjustable Output Voltage from 0.5V to 5V Better than 0.001%/mA Load Regulation Stable with Low-ESR Output Capacitor Low 100μA Ground Current Internal Thermal Protection Current Limit Protection 6µA Typical Quiescent Current at Shutdown APPLICATIONS Low-Current Regulators Battery-Powered Systems Mobile Devices, such as Cell Phones and GPS Navigators All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN 8 5 5V 3 IN EN PG OUT MP8904 1 VOUT R1 FB 4 R2 GND 6 Power Good MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 1 MP8904 –500mA LINEAR REGULATOR ORDERING INFORMATION Part Number* MP8904DD Package QFN8(2 x 3mm) Top Marking T3 * For Tape & Reel, add suffix –Z (eg. MP8904DD–Z) For RoHS Compliant Packaging, add suffix –LF (eg. MP8904DD–LF–Z) PACKAGE REFERENCE TOP VIEW OUT 1 8 IN NC 2 7 NC PG 3 6 GND FB 4 5 EN EXPOSED PAD ON BACKSIDE CONNECT TO GND ABSOLUTE MAXIMUM RATINGS (1) IN, FB to GND.................................-0.3V to +7V EN to GND .............................-0.3V to VIN +0.3V OUT ......................................-0.3V to VIN + 0.3V (2) Continuous Power Dissipation (TA = +25°C) ……………………………………………….2.5W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature .............. -65°C to +150°C Recommended Operating Conditions (3) Input Voltage VIN .............................2.5V to 6.5V Output Voltage ...................................0.5V to 5V Load Current ...........................500mA Maximum Operating Junction Temp. (TJ). -40°C to +125°C MP8904 Rev. 1.02 6/6/2012 Thermal Resistance (4) θJA θJC QFN8 (2 x 3mm) .....................55 ...... 12 ... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)TA)/ θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on approximately 1” square of 1 oz copper. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 2 MP8904 –500mA LINEAR REGULATOR ELECTRICAL CHARACTERISTICS VIN = 3.3V, VOUT = 1.2V, COUT = 4.7µF, CIN = 2.2µF, TA = +25°C, unless otherwise noted. Parameter Operating Voltage Ground Pin Current Shutdown Current Symbol Condition IOUT = 1mA IOUT = 1mA (6) IOUT = 500mA VEN = 1.45V, VIN = 5V 0.484 0.481 -40°C TA +85°C IOUT = 500mA IOUT = 1mA, VIN = (VOUT + 0.5V) to 6.5V (7) IOUT = 1mA to 500mA, VIN = VOUT + 0.5V FB Regulation Voltage Dropout Voltage (7) Line Regulation Load Regulation Power-Good Output Voltage, Low(8) Min 2.5 VOL Isink = 0.5mA EN Input, High Typ (4) 100 5 7 0.496 0.496 300 Max 6.5 0.508 0.510 0.005 %/V 0.001 %/mA 0.5 V V EN Input, Low VEN = 1.5V, 5V 0.01 Thermal Protection Current Limit 550 V mV 1.2 EN Input Bias Current Units V µA mA µA 0.4 V 1 μA 155 °C 730 mA Notes: 5) Parameter is guaranteed by design, not production tested. 6) Resistors for VOUT measurement are 10kΩ, 14kΩ, 1% 7) The ground current does not include current through feedback current 8) Dropout Voltage is defined as the input to output differential when the output voltage drops 1% below its nominal value 9) VFEEDBACK is 90% of the regulated value with 10kΩ pull-up to 5V MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 3 MP8904 –500mA LINEAR REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS Based on the Figure 2 Typical Application Circuit C1=2.2μF, C2 =4.7μF, C3=1nF, TA = +25°C, unless otherwise noted. Voltage Dropout vs Current 0.40 VDROPOUT (V) 0.35 Line Regulation 0.63 0.61 0.62 0.60 0.61 0.59 VIN=2.5V VO=1.8V-3.3V 0.25 0.20 0.10 100 200 300 400 0.60 0.58 0.59 0.57 0.58 500 VO (V) VO (V) 0.30 0.15 0.56 2.5 ILOAD CURRENT(mA) 85 ° C Load Regulation 3 3.5 4 4.5 VIN VOLTAGE (V) 5 5.5 0 Line Regulation 1.83 1.804 1.81 1.82 1.80 1.81 VIN=2.5V 1.796 1.79 VIN=5V 1.792 1.78 VIN=3.3V 1.788 200 300 400 500 ILOAD CURRENT (mA) 600 1.80 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 0 5.0 Line Regulation 3.83 3.33 1.82 3.32 3.32 VIN=3.3V VO (V) VIN=5V VO (V) 3.3 1.80 100 200 300 400 ILOAD CURRENT (mA) 500 Load Regulation 1.83 1.81 VIN=2.5V 1.78 2.5 -40 ° C Load Regulation 500 1.79 1.77 100 VO (V) VO (V) 1.82 1.800 100 200 300 400 ILOAD CURRENT (mA) Load Regulation 1.808 VO (V) VO (V) Load Regulation 3.30 3.31 VIN=3.6V 3.30 3.29 VIN=2.5V 1.79 1.78 0 100 200 300 400 500 ILOAD CURRENT (mA) MP8904 Rev. 1.02 6/6/2012 3.29 3.28 600 0 3.5 3.28 3.9 4.3 4.7 5.1 INPUT VOLTAGE (V) 5.5 0 100 200 300 400 ILOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 500 4 MP8904 –500mA LINEAR REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS (continued) C1=2.2μF, C2 =4.7μF, C3=1nF, TA = +25°C, unless otherwise noted. Shut Down Current vs. Input Voltage Line Transient VIN = 2.5V to 3.5V, VO = 1.8V, VEN= VIN, ILOAD = 50mA, with Resisitor Load 170 10 160 9 IQ Current (μΑ ) IS Current (μΑ ) Supply Current vs. Input Voltage 150 140 130 VIN 0.5V/div. 8 VO 50mV/div. 7 6 120 5 1 2 3 4 5 6 1 INPUT VOLTAGE (V) 2 3 4 5 2 ms/div. 6 INPUT VOLTAGE (V) PSRR vs Frequency VFB vs Temperature Load Transient VIN = 2.5V, VO = 1.8V, VEN= VIN, ILOAD = 50 to 300mA, with Resistor Load VIN=2.5V, VEN=VIN, ILOAD=1mA 90 495.0 80 494.5 494.0 60 VFB (mV) PSRR (dB) 70 50 40 30 20 VO 100mV/div. 493.5 ILOAD 0.2A/div. 493.0 492.5 10 0 492.0 0.1 1.0 10 100 1000 10000 FREQUENCY (Hz) -50 -20 10 40 70 400μ s/div. 100 TEMPERATURE (C) Enable Turn On Enable Turn Off Thermal Protection VIN = 3.3V, VO = 1.8V,VEN = 0V - 2V, IO = 200mA, with Resisitor Load VIN = 3.3V, VO = 1.8V,VEN = 2V - 0V, IO = 200mA, with Resisitor Load VIN = VEN = 5V, VO = 1.8V, ILOAD = 0.5A EN 2V/div. VEN 1V/div. VO 0.5V/div. VO 1V/div. VO 1/div. VPG 0.2A/div. VPG 0.2A/div. ILOAD 0.1A/div. ILOAD 0.2A/div. 100μ s/div. MP8904 Rev. 1.02 6/6/2012 VIN 2V/div. PG 5V/div. ILOAD 0.5/div. 1ms/div. 400μ s/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 5 MP8904 –500mA LINEAR REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS (continued) C1=2.2μF, C2 =4.7μF, C3=1nF, TA = +25°C, unless otherwise noted. MP8904 Rev. 1.02 6/6/2012 Short Circuit Protection Short Circuit Recovery VIN = 4V, VO = 1.8V, VEN = VIN VIN = 4V, VO = 1.8V, VIN = VEN PG 2V/div. PG 2V/div. VO 1V/div. VO 1V/div. ILOAD 1A/div. ILOAD 1A/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 6 MP8904 –500mA LINEAR REGULATOR PIN FUNCTIONS Pin # 1 Name OUT Description 2 NC 3 PG 4 FB 5 EN 6 GND 7 NC No connect. 8 IN Power Source Input. IN supplies the internal power to the MP8904 and is the source for the pass transistor. Bypass IN to GND with a ≥2.2μF capacitor. Regulator Output. Bypass OUT to GND with a ≥4.7μF capacitor. No connect. Power-Good Open Collector Output. Monitors the regulator output. If the regulator output falls below 10% of its regulation point, the power-good pin goes low. Feedback. Connect a resistive voltage divider from OUT to FB to set the output voltage. OUT feedback threshold is 0.5V. Enable Input. Drive EN above 1.2V to turn on the MP8904. Drive EN below 0.4V to turn it off. Ground. Exposed Pad Connect to GND. OPERATION The MP8904 is a low-current, low-voltage, lowdropout, linear regulator. It is intended for devices that require very low voltage and low quiescent current power, such as wireless modems and cellular phones. The MP8904 uses a PNP pass element and features internal thermal shutdown and internal current limit circuit. OUT VIN 8 VOUT 1 THERMAL PROTECT C1 R1 FB -- 4 R2 + R3 5V + -- 5 EN PG C2 0.5V REF 6 3 GND PG Figure 1: Functional Block Diagram MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 7 MP8904 –500mA LINEAR REGULATOR APPLICATION INFORMATION pull-up resistor to 0V-to-5.5V supply, such as regulated input voltage. Setting the Output Voltage The MP8904 has an adjustable output voltage set via an external resistor divider (R1 and R2 in Figure 2). Table 1: Adjustable Output Voltage Values vs. R1 (R2 =10kΩ) VOUT (V) R1 (Ω) 1.25 15k 1.5 20k where VFB = 0.5V is the OUT feedback threshold voltage. 1.8 26k 2 30k Example: For a 2.5V output and R2=10kΩ 2.5 40k 2.8 46k 3 50k 3.3 56k 4 70k 5 90k V VFB R1 R2 OUT V FB 2. 5 0. 5 R1 10k 40k 0 .5 Use a standard 40kΩ (1%) resistor for R1. Table 1 lists selected R1 values for typical output voltages (R2 = 10kΩ). Bypass Capacitors Bypass the reference voltage can be bypassed with an external capacitor to reduce noise. Use a low-ESR ceramic capacitor for the best performance. Power-Good The power-good (PG) pin monitors the output voltage; if the output voltage goes below 10% of its regulation point, the PG pin goes low. The PG pin is an open collector output that connects to a pull-up resistor (typically 10kΩ). Tie the TYPICAL APPLICATION CIRCUIT 8 VIN 5 3 IN EN PG OUT MP8904 1 C3 1nF FB 1.8V 4 GND 6 PG Figure 2: Typical Application Circuit MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 8 MP8904 –500mA LINEAR REGULATOR PCB layout guide PCB layout is very important to achieve good regulation, ripple rejection, transient response and thermal performance. For optimal performance, duplicate the EVB layout from Figure 3. 2) Use short and direct feedback connections. Place the feedback resistors and compensation components as close to the chip as possible. 3) Connect IN, OUT and GND to large copper surfaces to help cool the chip to improve thermal performance and long-term reliability. For any changes, follow the guidelines below: 1) Place the input and output ceramic bypass capacitors close to their respective IN and OUT pins. VIN R3 8 IN 5 EN MP8904 4 FB C1 VOUT OUT R1 PG R2 GND C2 6 C2 OUT IN R1 R3 R2 C3 OUT 1 8 IN NC 2 7 NC PG 3 6 GND FB 4 5 EN C1 GND Figure 3: PCB Layout, Top Layer MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 9 MP8904 –500mA LINEAR REGULATOR PACKAGE INFORMATION QFN8 (2mm x 3mm) 2.90 3.10 PIN 1 ID MARKING 0.30 0.50 0.18 0.30 1.90 2.10 PIN 1 ID INDEX AREA PIN 1 ID SEE DETAIL A 1.65 1.85 8 1 1.50 1.70 0.50 BSC 4 5 TOP VIEW BOTTOM VIEW PIN 1 ID OPTION A 0.30x45” TYP. 0.80 1.00 PIN 1 ID OPTION B R0.20 TYP. 0.20 REF 0.00 0.05 SIDE VIEW DETAIL A 2.90 0.70 NOTE: 1.70 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VCED-2. 5) DRAWING IS NOT TO SCALE. 0.25 1.60 0.50 RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP8904 Rev. 1.02 6/6/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 10