AME8834

Features:

*Stable with only 0.22F output Cap
*Very Low Dropout Voltage
*Guaranteed 150mA Output
*Accurate to within 1.0%
*50A Quiescent Current
*Over-Temperature Shutdown
*Current Limiting
*Short Circuit Current Fold-back
*Excellent PSRR (Typ. 70dB)
*Power-Saving Shutdown Mode
*Ultra-small SC-70 and SOT-25-L Package
*Factory Pre-set Output Voltages
*Low Temperature Coefficient
*Input Voltage Range (2V - 5.5V)

Application

* Cellular Phones
*Cellular Phones
* Instrumentation
*Portable Electronics
*Wireless Devices
*Cordless Phones
*PC Peripherals
*Battery Powered Widgets
*Electronic Scales
*CamerasInstrumentation
*Portable Electronics
*Wireless Devices
*Cordless Phones
*PC Peripherals
*Battery Powered Widgets
*Electronic Scales
*Cameras


Specifications




Description

The AME8833/8834 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits.  During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150 , or the current exceeds 150mA.  During thermal shutdown, the output voltage remains low.  Normal operation is restored when the junction temperature drops below 120.
The AME8833/8834 switches from voltage mode to current mode when the load exceeds the rated output current.  This prevents over-stress.  The AME8833/8834 also incorporates current foldback to reduce power dissipation when the output is short circuited.  This feature becomes active when the output drops below 0.8volts, and reduces the current flow by 65%.  Full current is restored when the voltage exceeds 0.8 volts.