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AAT3223
250mA NanoPower™ LDO Linear Regulator with Power-OK General Description
The AAT3223 PowerLinear NanoPower low dropout (LDO) linear regulator is ideal for portable applications where extended battery life is critical. This device features extremely low quiescent current which is typically 1.1µA. Dropout voltage is also very low, typically 190mV at 100mA. The AAT3223 has an enable pin feature which, when pulled low, will put the LDO regulator into shutdown mode, removing power from its load and offering extended power conservation capabilities for portable battery-powered applications. The AAT3223 also has a Power-OK (POK) feature. The POK function monitors the LDO output voltage and will alert the system if the output falls out of regulation. The AAT3223 has output short-circuit and overcurrent protection. In addition, the device has an over-temperature protection circuit, which will shut down the LDO regulator during extended over-current events. The AAT3223 is available in a space-saving 6-pin SOT23 package and is rated over the -40°C to +85°C temperature range. The AAT3223 is similar to the AAT3221 with the exception that it offers the additional Power-OK function through the POK pin.
Features
• • • • • • • • • • • • • •
PowerLinear™
1.1µA Quiescent Current 250mA Output Current Low Dropout: 190mV (typical) High Accuracy: ±2% Current Limit Protection Over-Temperature Protection Extremely Low Power Shutdown Mode Low Temperature Coefficient Stable Operation With Virtually Any Output Capacitor Type Power-OK Signal Output Active High Enable Pin 4kV ESD Factory-Programmed Output Voltages 6-pin SOT23 Package
Applications
• • • • • • • Cellular Phones Digital Cameras Handheld Electronics Notebook Computers PDAs Portable Communication Devices Remote Controls
Typical Application
VIN 1µF ON/OFF EN IN OUT VOUT 100k POK GND 1µF POK
AAT3223
GND
GND
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AAT3223
250mA NanoPower™ LDO Linear Regulator with Power-OK Pin Descriptions
Pin #
1 2 3 4 5 6
Symbol
IN GND OUT N/C EN POK
Function
Input pin. It is recommended to bypass this pin with a 1µF capacitor. Ground connection pin. Output pin. This pin should be decoupled with a 1µF or larger capacitor. Not connected. Enable input. Active high, logic level compatible. Power-OK output pin. This pin is pulled to ground during a power failure; it is normally high impedance and should have a 100kΩ pull-up resistor connected to OUT.
Pin Configuration
SOT23-6 (Top View) IN GND OUT
1 6
POK EN N/C
2
5
3
4
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3223.2005.04.1.4
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AAT3223
250mA NanoPower™ LDO Linear Regulator with Power-OK Absolute Maximum Ratings1
TA=25°C, unless otherwise noted. Symbol
VIN VEN VENIN(MAX) IOUT TJ TLEAD
Description
Input Voltage EN to GND Voltage Maximum EN to Input Voltage Maximum DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6 -.