AAT3239

AAT3239 500mA MicroPower™ LDO General Description The AAT3239 MicroPower low dropout (LDO) linear regulator is ideally suited for portable applications where very fast transient response, extended battery life, and small size are critical. The AAT3239 has been specifically designed for high-speed turn-on and turn-off performance, fast transient response, good power supply rejection ratio (PSRR), and is reasonably low noise, making it ideal for powering sensitive circuits with fast switching requirements. Other features include low quiescent current, typically 70µA, and low dropout voltage which is typically less than 400mV at 300mA. The device is output short-circuit protected and has a thermal shutdown circuit for additional protection under extreme operating conditions. The AAT3239 also features a low-power shutdown mode for extended battery life. A reference bypass pin has been provided to improve PSRR performance and output noise by connecting a small external capacitor from the AAT3239's reference output to ground. The AAT3239 is available in a Pb-free, 8-pin TSOPJW package in factory-programmed voltages. Features • • • • • • • • • • • • • • • PowerLinear™ 500mA Output Current Low Dropout: 400mV at 300mA High Accuracy: ±2.0% 70µA Quiescent Current Fast Line and Load Transient Response High-Speed Device Turn-On and Shutdown High Power Supply Rejection Ratio Low Self Noise Short-Circuit Protection Over-Temperature Protection Uses Low Equivalent Series Resistance (ESR) Ceramic Capacitors Noise Reduction Bypass Capacitor Shutdown Mode for Longer Battery Life Low Temperature Coefficient TSOPJW 8-Pin Package Applications • • • • • Cellular Phones Digital Cameras Notebook Computers Personal Portable Electronics Portable Communication Devices Typical Application VIN IN OUT VOUT AAT3239 ON/OFF EN GND 1µF 10nF 2.2µF BYP GND GND 3239.2006.03.1.2 1 AAT3239 500mA MicroPower™ LDO Pin Descriptions Pin # 1 2 Symbol BYP EN Function Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to GND. This will also provide a soft-start function. Enable pin; this pin should not be left floating. When pulled low, the PMOS pass transistor turns off and all internal circuitry enters low-power mode, consuming less than 1µA. Output pin; should be decoupled with 2.2µF ceramic capacitor. Input voltage pin; should be decoupled with 1µF or greater capacitor. Ground connection pin. 3 4 5, 6, 7, 8 OUT IN GND Pin Configuration TSOPJW-8 (Top View) BYP EN OUT IN GND GND GND GND 1 8 2 7 3 6 4 5 2 3239.2006.03.1.2 AAT3239 500mA MicroPower™ LDO Absolute Maximum Ratings1 Symbol VIN VENIN(MAX) IOUT TJ Description Input Voltage Maximum EN to Input Voltage DC Output Current Operating Junction Temperature Range Value 6 0.3 PD/(VIN - VO) -40 to 150 Units V V mA °C Thermal Information2 Symbol ΘJA PD Description Maximum Thermal Resistance Maximum Power Dissipation3 (TA = 25°C) Rating 90 1.11 Units °C/W W Recommended Operating Conditions Symbol VIN T Description Input Voltage Ambient Temperature Range 4 Rating (VOUT + VDO) to 5.5 -40 to +85 Units V °C 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on a demo board. 3. Derate 11.1mW/°C above 25°C. 4. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V. 3239.2006.03.1.2 3 AAT3239 500mA MicroPower™ LDO Electrical Characteristics1 VIN = VOUT(NOM) + 1.2V for VOUT options greater than 1.5V. VIN = 2.5 for VOUT ≤ 1.5V. IOUT = 1mA, COUT = 2.2µF, CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Description Conditions IOUT = 1mA to 300mA VOUT Output Voltage Tolerance IOUT = 1mA to 500mA IOUT VDO ISC IQ ISD ∆VOUT/ VOUT*∆VIN ∆VOUT(line) ∆VOUT(load) tENDLY VEN(L) VEN(H) IEN PSRR Output Current Dropout Voltage2, 3 Short-Circuit Current Ground Current Shutdown Current Line Regulation Dynamic Line Regulation Dynamic Load Regulation Enable Delay Time Enable Threshold Low Enable Threshold High Leakage Current on Enable Pin Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient TA = 25°C TA = -40 to 85°C TA = 25°C TA = -40 to 85°C Min Typ Max -1.5 -2.5 -2.0 -3.5 500 1.5 2.5 2.0 3.5 400 600 0.8 1.2 600 70 125 1 0.09 2.5 100 120 15 0.6 1.5 Units % VOUT > 1.2V IOUT = 300mA IOUT = 500mA VOUT < 0.4V VIN = 5V, No Load, EN = VIN VIN = 5V, EN = 0V VIN = VOUT + 1 to 5.0V VIN = VOUT + 1V to VOUT + 2V, IOUT = 500mA, TR/TF = 2µs IOUT = 1mA to 300mA, TR