AAT3238(2006) データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3238
(Rev.:2006)

300mA MicroPower™ High Performance LDO Linear Regulator

Advanced Analogic Technologies 

AAT3238

300mA MicroPower™

High Performance LDO Linear Regulator

No-Load Stability

The AAT3238 is designed to maintain output volt-

age regulation and stability under operational no-

load conditions. This is an important characteristic

for applications where the output current may drop

to zero.

Reverse Output-to-Input Voltage

Conditions and Protection

Under normal operating conditions, a parasitic

diode exists between the output and input of the

LDO regulator. The input voltage should always

remain greater than the output load voltage, main-

taining a reverse bias on the internal parasitic

diode. Conditions where VOUT might exceed VIN

should be avoided since this would forward bias

the internal parasitic diode and allow excessive

current flow into the VOUT pin, possibly damaging

the LDO regulator.

In applications where there is a possibility of VOUT

exceeding VIN for brief amounts of time during nor-

mal operation, the use of a larger value CIN capaci-

tor is highly recommended. A larger value of CIN

with respect to COUT will effect a slower CIN decay

rate during shutdown, thus preventing VOUT from

exceeding VIN. In applications where there is a

greater danger of VOUT exceeding VIN for extended

periods of time, it is recommended to place a

Schottky diode across VIN to VOUT (connecting the

cathode to VIN and anode to VOUT). The Schottky

diode forward voltage should be less than 0.45V.

3238.2006.11.1.6

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