AAT3236

AAT3236 300mA CMOS High Performance LDO General Description The AAT3236 is a MicroPower low dropout (LDO) linear regulator designed to deliver a continuous 300mA output load current and is capable of handling short duration current peaks up to 500mA. With a very small footprint SOT23-5 package, it is ideally suited for portable applications where low noise, high power supply ripple rejection (PSRR), extended battery life, and small size are critical. The AAT3236 features fast transient response and low output self noise for powering sensitive RF circuitry. Other features include low quiescent current, typically 100µA, and low dropout voltage, typically 300mV at full output load current. The device has internal output short-circuit protection and thermal shutdown to prevent damage under extreme conditions. The AAT3236 also features a low-power shutdown mode for longer battery life. A bypass pin is provided to improve PSRR performance by connecting an external capacitor from the device reference output to ground. The AAT3236 is available in a Pb-free, space-saving SOT23-5 or SC70JW-8 package in nine factory-programmed voltages: 2.5V, 2.7V, 2.8V, 2.85V, 3.0V, 3.1V, 3.3V, 3.5V, or 3.6V. Features • • • • • • PowerLinear™ • • • • • • • • 500mA Peak Output Current Low Dropout - Typically 300mV at 300mA Guaranteed 300mA Output High Accuracy: ±1.5% 100µA Quiescent Current High Power Supply Ripple Rejection — 70dB at 1kHz — 50dB at 10kHz Very Low Self Noise: 45µVrms Noise Reduction Bypass Capacitor Short-Circuit Protection Over-Temperature Protection Shutdown Mode for Longer Battery Life Low Temperature Coefficient Nine Factory-Programmed Output Voltages SOT23 5-Pin or SC70JW 8-Pin Package Applications • • • • Cellular Phones Notebook Computers Personal Portable Electronics Portable Communication Devices Typical Application VIN IN VOUT AAT3236 OUT BYP ON/OFF 1μF EN GND 10nF 2.2μF GND GND 3236.2007.03.1.4 1 AAT3236 300mA CMOS High Performance LDO Pin Descriptions Pin # SOT23-5 SC70JW-8 Symbol IN GND EN Function Input voltage pin; should be decoupled with 1µF or greater capacitor. Ground connection pin. Enable pin. When pulled low, the PMOS pass transistor turns off and all internal circuitry enters low-power mode, consuming less than 1µA. This pin should not be left floating. Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to GND. This will also provide a softstart function. Output pin; should be decoupled with 2.2µF capacitor. 1 2 3 5, 6 8 7 4 1 BYP 5 2, 3, 4 OUT Pin Configuration SOT23-5 (Top View) SC70JW-8 (Top View) IN GND EN 1 5 OUT 2 3 4 BYP BYP OUT OUT OUT 1 2 3 4 8 7 6 5 GND EN IN IN 2 3236.2007.03.1.4 AAT3236 300mA CMOS High Performance LDO Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. 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 (SOT23-5, SC70JW-8) Maximum Power Dissipation (SOT23-5, SC70JW-8) Value 190 526 Units °C/W mW Recommended Operating Conditions Symbol VIN T Description Input Voltage Ambient Temperature Range Rating (VOUT + 0.3) 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. 3236.2007.03.1.4 3 AAT3236 300mA CMOS High Performance LDO Electrical Characteristics VIN = VOUT(NOM) + 1V, IOUT = 1mA, COUT = 2.2µF, CIN = 1µF, CBYP = 10nF, TA = -40°C to +85°C, unless otherwise noted. For typical values, TA = 25°C. Symbol VOUT IOUT VDO ISC IQ ISD ΔVOUT/ VOUT*ΔVIN Description Output Voltage Tolerance Output Current Dropout Voltage1 Short-Circuit Current Ground Current Shutdown Current Line Regulation Conditions IOUT = 1mA to 300mA Min TA = 25°C -1.5 TA = -40 to 85°C -2.5 300 Typ Max 1.5 2.5 Units % mA mV mA µA µA %/V mV mV V 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 5.5V 300 600 100 500 150 1 0.07 ΔVOUT(line) Dynamic Line Regulation ΔVOUT(load) VEN(L) VEN(H) IEN PSRR Dynamic Load Regulation Enable Threshold Low Enable Threshold High Leakage Current Enable Pin Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient VIN = VOUT + 1V to VOUT + 2V, IOUT = 150mA, TR/TF = 2µs IOUT = 1mA to 150mA, TR