AAT3237IGU-2.5-T1

AAT3237 300mA MicroPower™ LDO with PowerOK General Description The AAT3237 MicroPower low dropout (LDO) linear regulator is ideally suited for portable applications where low noise, extended battery life, and small size are critical. The AAT3237 has been specifically designed for low output noise performance, fast transient response, and high power supply rejection ratio (PSRR). Other features include low quiescent current, typically 70µA, and low dropout voltage, typically less than 400mV at full output current. The device is output short-circuit protected and has a thermal shutdown circuit for additional protection under extreme conditions. The AAT3237 also features a low-power shutdown mode for extended battery life. A Power-OK opendrain output signals when VOUT is in regulation. The AAT3237 is available in a Pb-free, space-saving 6-pin SOT23 or 8-pin SC70JW package in 13 factory-programmed voltages: 1.2V, 1.5V, 1.8V, 2.0V, 2.3V, 2.5V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.3V, or 3.5V. Features • • • • • • • • • • • • • • PowerLinear ™ SmartSwitch™ Low Dropout: 400mV at 300mA Guaranteed 300mA Output High Accuracy ±1.5% 70µA Quiescent Current High Power Supply Ripple Rejection Power-OK (POK) Output Fast Line and Load Transient Response Short-Circuit Protection Over-Temperature Protection Uses Low Equivalent Series Resistance (ESR) Ceramic Capacitors Shutdown Mode for Longer Battery Life Low Temperature Coefficient 13 Factory-Programmed Output Voltages SOT23 6-Pin or SC70JW 8-Pin Package Applications • • • • • • Cellular Phones Desktop Computers Digital Cameras Notebook Computers Personal Portable Electronics Portable Communication Devices Typical Application VIN IN OUT VOUT AAT3237 ON/OFF EN GND 1µF 2.2µF POK POK GND GND 3237.2006.01.1.4 1 AAT3237 300mA MicroPower™ LDO with PowerOK Pin Descriptions Pin # SOT23-6 SC70JW-8 Symbol IN GND EN Function Input voltage pin; should be decoupled with 1µF or greater capacitor. Ground connection pin. 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. Power-OK output. This open-drain output is low when OUT is out of regulation. Connect a pull-up resistor from POK to OUT. Output pin; should be decoupled with 2.2µF ceramic capacitor. 1 2, 5 3 5, 6 8 7 4 6 1 2, 3, 4 POK OUT Pin Configuration SOT23-6 (Top View) SC70JW-8 (Top View) IN GND EN 1 6 OUT GND POK 2 5 3 4 POK OUT OUT OUT 1 2 3 4 8 7 6 5 GND EN IN IN 2 3237.2006.01.1.4 AAT3237 300mA MicroPower™ LDO with PowerOK Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol VIN, POK VENIN(MAX) IOUT TJ TLEAD Description Input Voltage, POK Maximum EN to Input Voltage DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Value 6 0.3 PD/(VIN - VO) -40 to 150 300 Units V V mA °C °C Thermal Information2 Symbol ΘJA PD Description Maximum Thermal Resistance (SOT23-6, SC70JW-8) Maximum Power Dissipation (SOT23-6, SC70JW-8) Rating 150 667 Units °C/W mW Recommended Operating Conditions Symbol VIN T Description Input Voltage3 Ambient Temperature Range 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. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V. 3237.2006.01.1.4 3 AAT3237 300mA MicroPower™ LDO with PowerOK Electrical Characteristics VIN = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = 2.5V 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 VOUT IOUT VDO ISC IQ ISD ∆VOUT/ VOUT*∆VIN ∆VOUT(line) ∆VOUT(load) VEN(L) VEN(H) IEN VPOK VPOKHYS VPOK(OL) IPOK PSRR Description Output Voltage Tolerance Output Current Dropout Voltage 1, 2 Short-Circuit Current Ground Current Shutdown Current Line Regulation 3 Dynamic Line Regulation Dynamic Load Regulation Enable Threshold Low Enable Threshold High Leakage Current on Enable Pin POK Trip Threshold POK Hysteresis POK Output Voltage Low POK Output Leakage Current Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient Conditions IOUT = 1mA to 300mA TA = 25°C TA = -40 to 85°C Min Typ Max -1.5 -2.5 300 400 600 70 1.5 2.5 600 125 1 0.09 5 60 0.6 1.5 Units % mA mV mA µA µA %/V mV mV V V µA % of VOUT % of VOUT V µA dB VOUT > 1.2V IOUT = 300mA 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 = 300mA, TR/TF = 2µs IOUT = 1mA to 300mA, TR