MP8902 Low Dropout 250mA Linear Regulator DESCRIPTION FEATURES The MP8902 is a low-noise, low-dropout linear regulator. It operates from 2.7V to 6.5V input voltage, and regulates the output voltage with 2% accuracy at 2.5V, 3.3V, or from 1.25V to 5V. The MP8902 can supply up to 250mA of load current. The MP8902 features thermal overload protection. It is available in a 2mm x 2mm 8-pin QFN package. FIXED VOLTAGE PART NUMBERS Part Number Output Voltage MP8902DG–2.5 MP8902DG–3.3 2.5V 3.3V Low 250mV Dropout at 250mA Output 2% Accurate Output Voltage Fixed Output Voltage Options of 2.5V or 3.3V Adjustable Output Voltage Option from 1.25V to 5V using an External Resistor Divider Up to 6.5V Input Voltage High PSRR o 70dB at 1kHz o 30dB at 1MHz Better Than 0.001%/mA Load Regulation Stable With Low-ESR Output Capacitor Low 125μA Ground Current Internal Thermal Protection APPLICATIONS 802.11 PC Cards Mobile Handset PLL Power Audio Codec Power All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR ORDERING INFORMATION Part Number* Package MP8902DG–2.5 QFN8 (2x2) Part Number** Package MP8902DG–3.3 QFN8 (2x2) Top Marking Temperature Top Marking –40C to +85C Temperature –40C to +85C * For Tape & Reel, add suffix –Z (e.g. MP8902DG–2.5–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP8902DG–2.5–LF–Z) ** For Tape & Reel, add suffix –Z (e.g. MP8902DG–3.3–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP8902DG–3.3–LF–Z) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) IN Supply Voltage ...................... –0.3V to +7.0V FB Voltage ........................ –0.3V to VOUT + 0.3V All Other Pins ................................ –0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) ………………………………………………....1.6W Junction Temperature .............................. 150C Lead Temperature ................................... 260C Storage Temperature ............. –65°C to +150C Recommended Operating Conditions (3) Input Voltage ................................. 2.7V to 6.5V Output Voltage ................................ 1.25V to 5V Load Current.......................... 250mA Maximum Operating Temperature............. –40C to +85C MP8902 Rev. 1.0 9/4/2017 Thermal Resistance (4) θJA θJC QFN8 (2x2) ............................. 80 ...... 16 ... 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. © 2017 MPS. All Rights Reserved. 2 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR ELECTRICAL CHARACTERISTICS VIN = 5V, TA = +25C, unless otherwise noted. Parameter Operating Voltage Output Voltage Accuracy Ground Pin Current Shutdown Current FB Regulation Voltage Dropout Voltage (6) Line Regulation Load Regulation PSRR Output Voltage Noise EN Input High Voltage EN Input Low Voltage EN Input Bias Current Thermal Protection Thermal Protection Hysteresis Symbol Condition IOUT = 1mA IOUT = 1mA, VOUT = 1.25V to 5V IOUT = 1mA–250mA VEN = 0V, VIN = 5V –40C TA +85C VOUT = 3V IOUT = 250mA VOUT = 4V IOUT = 1mA, (7) VIN = (VOUT + 0.5V) to 6.5V IOUT = 1mA to 250mA, (7) VIN = VOUT + 0.5V VIN > VOUT +0.5V, COUT = 2.2μF, VIN(AC) = 100mV, f = 1kHz VIN > VOUT + 0.5V, COUT = 2.2μF, VIN(AC) = 100mV, f = 1MHz f = 1kHz, CFB > 0.1μF, IOUT = 1mA Min 2.7 2.0 1.197 1.194 Typ (5) ±1.0 125 0.1 1.222 1.222 230 190 Max 6.5 2.0 155 1 1.246 1.249 V mV 0.005 0.08 %/V 0.001 0.02 %/mA 70 dB 30 dB 300 1.5 0.4 VEN = 0V, 5V Units V % μA μA 0.01 155 30 1 nV/√Hz V V μA C C Notes: 5) Parameter is guaranteed by design, not production tested. 6) Dropout Voltage is defined as the input to output differential when the output voltage drops 1% below its normal value. 7) VIN = 2.7V for VOUT = 1.25V to 2.2V MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS VIN = 4.5V, VOUT = 2.85V, C1 = 1μF, C2 = 0.1μF, C3 = 2.2μF, TA = +25C unless otherwise noted. MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 4 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR PIN FUNCTIONS Pin # Name 1, 2 OUT 3 FB 4 5 6 7, 8 Description Regulator Output. OUT is the output of the linear regulator. Bypass OUT to GND with a 1μF or greater capacitor. Feedback Input. Connect a resistive voltage divider from OUT to FB to set the output voltage. OUT feedback threshold is 1.222V. GND, Exposed The exposed pad and GND pin must be connected to the same ground plane. Pad Enable Input. Drive EN high to turn on the MP8902, drive EN low to turn it off. For automatic EN startup, connect EN to IN. NC No Connect. Power Source Input. IN supplies the internal power to the MP8902 and is the source of the IN pass transistor. Bypass IN to GND with a 1μF or greater capacitor. OPERATION The MP8902 is a low-current, low-noise, high-PSRR, low-dropout, linear regulator. It is intended for use in devices that require very low noise power supplies and high-PSRR such as PLL VCO supplies for mobile handsets and 802.11 PC Cards, as well as audio codecs and microphones. The MP8902 uses a PMOS pass element and features internal thermal shutdown. As shown in Figures 1 and 2, optional feedforward capacitor CBYP may be added between FB and OUT pins for an improved transient response. Figure 1—Ultra-Low-Noise Fixed Output Regulator Figure 2—Ultra-Low-Noise Adjustable Regulator: VOUT = VFB(1+(R1/R2)) MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 5 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR APPLICATION INFORMATION SETTING THE OUTPUT VOLTAGE The fixed output voltage of the MP8902DG is set to 2.5V or 3.3V, depending on the internal resistor divider (Figure 1). You can also adjust the output voltage by using an external resistor divider (R1 and R2 in Figure 2). However, the sum of R1 and R2 should not exceed 100kΩ to minimize the impact of the internal resistor divider. For accurate output-voltage setting, it is suggested to use 10kΩ (1%) for the low-side resistor R2 of the voltage divider, the high side resistor R1 can be determined by the equation: V VFB R1 R2 OUT VFB Where VFB is the OUT feedback threshold voltage equal to 1.222V. Example: For 2.5V Output 2.5V 1.222V R1 10.41k 1.222V 10k MP8902 Rev. 1.0 9/4/2017 You can select a standard 10.5kΩ (1%) resistor for R1. The following table lists the selected R1 values for some typical output voltages: Table 1—Adjustable Output Voltage R1 Values VOUT (V) R1 (Ω) 1.25 232 1.5 2.26k 1.8 4.75k 2 6.34k 2.5 10.5k 2.8 13k 3 14.7k 3.3 16.9k 4 22.6k 5 30.9k In Figures 3 and 4, C2 is added for an improved transient response. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 6 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR TYPICAL APPLICATION CIRCUIT Figure 3—Typical Application Circuit (Fixed) Figure 4—Typical Application Circuit (Adjustable) MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 7 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR PCB layout guide PCB layout is very important to achieve good regulation, ripple rejection, transient response and thermal performance. It is highly recommended to duplicate EVB layout for optimum performance. If change is necessary, please follow these guidelines and take figure 5 for reference. 1) Input and output bypass ceramic capacitors are suggested to be put close to the IN Pin and OUT Pin respectively. 2) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 3) Connect IN, OUT and especially GND respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. GND IN OUT C3 C2 R1 C1 OUT 1 8 IN OUT 2 7 IN FB 3 6 NC GND 4 5 EN R3 R2 GND Top Layer Figure 5—PCB Layout MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 8 MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR PACKAGE INFORMATION 2x2 QFN8 NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. MP8902 Rev. 1.0 9/4/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 9