AAT3237B Advanced Analogic Technologies, Inc., AAT3237B Datasheet - Page 8

• Manufacturer Part Number: AAT3237B
• Description: 300ma Micropower? Ldo Linear Regulator With Power-ok
• Manufacturer: Advanced Analogic Technologies, Inc.

Functional Description
The AAT3237B is intended for LDO regulator appli-
cations where output current load requirements
range from no load to 300mA.
The advanced circuit design of the AAT3237B pro-
vides excellent transient response and fast turn-on
ability. The LDO regulator output has been specif-
ically optimized to function with low-cost, low-ESR
ceramic capacitors. However, the design will allow
for operation over a wide range of capacitor types.
The AAT3237B has an integrated Power-OK com-
parator which indicates when the output is out of
regulation. The POK open-drain signal is held low
when the AAT3237B is in shutdown mode.
Functional Block Diagram
8
POK
EN
IN
Amplifier
Error
94%
Over-Temperature
Over-Current
Protection
Protection
LDO Linear Regulator with Power-OK
Reference
Voltage
The device enable circuit is provided to shut down
the LDO regulator for power conservation in portable
products. The enable circuit has an additional out-
put capacitor discharge circuit to assure sharp appli-
cation circuit turn-off upon device shutdown.
This LDO regulator has complete short-circuit and
thermal protection.
these two internal protection circuits gives the
AAT3237B a comprehensive safety system during
extreme adverse operating conditions.
power dissipation is limited to the package type
and thermal dissipation properties. Refer to the
Thermal Considerations section of this datasheet
for details on device operation at maximum output
current loads.
GND
300mA MicroPower™
The integral combination of
AAT3237B
OUT
3237B.2006.01.1.3
Device