MP8801 Low Dropout 150mA Linear Regulator

Transcription

1 The Future of Analog IC Technology DESCRIPTION The MP8801 is a low-noise, low-dropout linear regulator. It operates from a.7v to 6.V input voltage and regulates the output voltage with % accuracy at.v,.8v or.v. The internally set output voltage may be overridden with an external resistor divider from 1.V to V. The MP8801 can supply up to 10mA of load current. The MP8801 features thermal overload protection and is available in a -pin TSOT- package. FIXED VOLTAGE PART NUMBERS Part Number Output Voltage MP8801DJ..V MP8801DJ.8.8V MP8801DJ..V EVALUATION BOARD REFERCE Board Number Output* Dimensions EV8801DJ-00A.8V.0 X x.0 Y x 0. Z * Default output voltage adjustable from 1.V to.0v using an external resistor divider. MP8801 Low Dropout 10mA Linear Regulator FEATURES Low 100mV Dropout at 100mA Output % Accurate Output Voltage Fixed Output Voltage Options of.v,.8v or.v Adjustable Output Voltage from 1.V to V using an External Resistor Divider Up to 6.V Input Voltage High PSRR o 70dB at 1KHz o 0dB at 1MHz Better Than 0.001%/mA Load Regulation Stable With Low-ESR Output Capacitor Low 1µA Ground Current Internal Thermal Protection APPLICATIONS PC Cards Mobile Handset PLL Power Audio Codec Power MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION.7V to 6.V 1 PUT 1.V to V MP8801DJ-X.X (Pin) may be connected to (Pin 1) directly R1 R The sum of R1 and R should not exceed 100k V DROP (mv) V DROP vs I LOAD I LOAD (ma) MP8801 Rev

2 PACKAGE REFERCE 1 TOP VIEW MARKG Part Number** Package Temp MP8801DJ. TSOT- 0 C to +8 C MP8801DJ.8 TSOT- 0 C to +8 C MP8801DJ. TSOT- 0 C to +8 C ** For Tape & Reel, add suffix Z (eg. MP8801DJ.8 Z) For RoHS Compliant Packaging, add suffix LF (eg. MP8801DJ.8 LF Z) ABSOLUTE MAXIMUM RATGS (1) Supply Voltage... 0.V to +7.0V Voltage... 0.V to V + 0.V All Other Pins... 0.V to +6V Junction Temperature...10 C Lead Temperature...60 C Storage Temperature... 6 C to +10 C Recommended Operating Conditions () Input Voltage....7V to 6.V Output Voltage... 1.V to V Load Current...10mA Maximum Operating Temperature... 0 C to +8 C Thermal Resistance () θ JA θ JC TSOT C/W Notes: 1) Exceeding these ratings may damage the device. ) The device is not guaranteed to function outside of its operating conditions. ) Measured on approximately 1 square of 1 oz copper. ELECTRICAL CHARACTERISTICS = V, T A = + C, unless otherwise noted. Parameter Symbol Condition Min Typ () Max Units Operating Voltage I = 1mA.7 6. V Output Voltage Accuracy I = 1mA, V = 1.V to V ±1.0 ±.0 % Ground Pin Current I = 1mA 10mA 1 10 µa Shutdown Current V = 0V, = V µa Regulation Voltage C T A 8 C V V = V 10 Dropout Voltage () I = 10mA V = V 1 mv Line Regulation I = 1mA, (6) = (V + 0.V) to 6.V %/V Load Regulation I = 1mA to 10mA, (6) = V + 0.V %/ma PSRR > V +0.V, C =.µf, () (AC) = 100mV, f = 1kHz 70 db > V +0.V, C =.µf, () (AC) = 100mV, f = 1MHz 0 db Output Voltage Noise f = 1kHz, C > 0.1µF, I = 1mA () 00 nv/ Hz Input High Voltage 1. V Input Low Voltage 0. V Input Bias Current V = 0V, V µa Thermal Protection () 1 C Thermal Protection Hysteresis () 0 C Notes: ) Parameter is guaranteed by design, not production tested. ) Dropout Voltage is defined as the input to output differential when the output voltage drops 1% below its normal value. 6) =.7V for V = 1.V to.v MP8801 Rev

3 TYPICAL PERFORMANCE CHARACTERISTICS =.V, V =.8V, C1 = 1µF, C = 0.1µF, C =.µf, T A = + C unless otherwise noted I vs I LOAD = 10mA I LOAD = 1mA I vs I LOAD = 6.V =.0V =.7V V (V) V vs. I LOAD = 1mA I LOAD = 10mA (V) I LOAD (ma) (V) PSRR vs Frequency Output Noise Spectral Density Output Noise Spectral Density PSRR (db) FREQUCY (KHz) x: 1.0kHz y: 0.01n I = 10mA K FREQUCY (Hz) x: 1.0kHz y: 87.00n I = 1mA K FREQUCY (Hz) V DROP (mv) V DROP vs I LOAD I LOAD (ma) I LOAD (0mA/div.) V (0mV/div.) Load-Transient Response (Circuit in Figure ) V V.8V Line-Transient Response (Circuit in Figure ) (1V/div.) V (10mV/div.) MP8801 Rev

4 P FUNCTIONS Pin # Name Description 1 Power Source Input. supplies the internal power to the MP8801 and is the source of the pass transistor. Bypass to with a 1µF or greater capacitor. Ground. Enable Input. Drive high to turn on the MP8801; low to turn it off. For automatic startup, connect to. Feedback Input. Connect a resistive voltage divider from to to set the output voltage. The feedback threshold is 1.V. Regulator Output. is the output of the linear regulator. Bypass to with a 1µF or greater capacitor. OPERATION The MP8801 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 PC Cards, as well as audio codecs and microphones. The MP8801 uses a PMOS pass element and features internal thermal shutdown. The normally fixed output MP8801 may be converted to an adjustable output device by applying a resistor divider network as shown in Figure. An optional feed-forward capacitor, C BYP, may be added for an improved transient response TERNAL RESISTOR DIVIDER BANDGAP REFERCE C BYP C V V Figure 1 Ultra-Low-Noise Fixed Output Regulator 1 EXTERNAL RESISTOR DIVIDER V R1 C BYP + -- BANDGAP REFERCE R C V Figure Ultra-Low-Noise Adjustable Regulator: V = V (1+(R1/R)) MP8801 Rev

5 APPLICATION FORMATION SETTG THE PUT VOLTAGE The fixed output voltage of the MP8801DJ is set to.v,.8v or.v, depending on the internal resistor divider (Figure 1). You can also adjust the output voltage by using an external resistor divider (R1 and R in Figure ). However, the sum of R1 and R should not exceed 100kΩ in order to minimize the impact of the internal resistor divider. For an accurate output-voltage setting, use 10kΩ (±1%) for the low-side resistor R of the voltage divider, while the high-side resistor R1 can be determined by the equation: V R 1 = R V V Where V is the feedback threshold voltage equal to 1.V. Example: For.V Output.V 1.V R 1 = = 10.1k Ω 1.V 10kΩ You can select a standard 10.kΩ (±1%) resistor for R1. The following table lists the selected R1 values for some typical output voltages: Table 1 Adjustable Output Voltage R1 Values PUT CAPACITOR SELECTION For proper operation, place a ceramic capacitor (C1) between 1µF and 10µF of dielectric type XR or X7R between the input pin and ground. Larger values in this range will help improve line transient response at the drawback of increased size. PUT CAPACITOR SELECTION For stable operation, use a ceramic capacitor (C) of type XR or X7R between 1µF and 10µF. Larger values in this range will help improve load transient response and reduce noise with the drawback of increased size. Output capacitors of other dielectric types may be used, but are not recommended as their capacitance can deviate greatly from their rated value over temperature. To improve load transient response, add a small ceramic (XR, X7R or YV dielectric) 100nF feed forward capacitor in parallel with R1. The feed forward capacitor is not required for stable operation. V (V) R1 (Ω) R (Ω) k 1.8.7k 6.k. 10.k.8 1k 1.7k. 16.9k.6k 0.9k 10k In Figures and, C is added for an improved transient response. MP8801 Rev

6 TYPICAL APPLICATION CIRCUIT.7V to 6.V 1 PUT.8V MP8801DJ-.8 C 100nF Figure Typical Application Circuit (Fixed).7V to 6.V 1 PUT V MP8801DJ-X.X Figure Typical Application Circuit (Adjustable) MP8801 Rev

7 PACKAGE FORMATION TSOT TYP 0.9 BSC 1.0 TYP TYP 1 TOP VIEW RECOMMDED LAND PATTERN BSC MAX SEATG PLANE SEE DETAIL "A" FRONT VIEW SIDE VIEW NOTE: GAUGE PLANE 0. BSC 0 o -8 o DETAIL A ) ALL DIMSIONS ARE MILLIMETERS. ) PACKAGE LGTH DOES NOT CLUDE MOLD FLASH, PROTRUSION OR GATE BURR. ) PACKAGE WIDTH DOES NOT CLUDE TERLEAD FLASH OR PROTRUSION. ) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMG) SHALL BE 0.10 MILLIMETERS MAX. ) DRAWG CONFORMS TO JEDEC MO-19, VARIATION AA. 6) DRAWG IS NOT TO SCALE. 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. MP8801 Rev