AAT3242ITP-IN-T1 AnalogicTech, AAT3242ITP-IN-T1 Datasheet - Page 9

• Manufacturer Part Number: AAT3242ITP-IN-T1
• Description: 300mA/150mA Dual CMOS LDO Linear Regulator
• Manufacturer: AnalogicTech

Functional Block Diagram
Functional Description
The AAT3242 is a high performance dual LDO regulator
with two Power OK pins. The first regulator (A) sources
300mA of current, while the second (B) regulator can
deliver 150mA. Each regulator has an integrated Power
OK comparator which indicates when the respective out-
put is out of regulation. The POK pins are open drain
outputs, and they are held low when the respective
regulator is in shutdown mode.
The device has independent enable pins to shut down
each LDO regulator for power conservation in portable
products. Forcing EN A/B low (<0.6V) powers down the
regulators and draws a maximum of 1.0μA. The AAT3242
has short-circuit and thermal protection in case of
adverse operating conditions. Device 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 max-
imum output current loads.
3242.2008.08.1.11
3242.2008.08.1.11
PowerLinear
PowerLinear
TM
TM
ENA
ENB
INA
INB
Amplifier
Amplifier
Error
Error
+
+
-
-
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
Over-Current
Reference
Over-Current
Reference
Temperature
Temperature
Protection
Protection
Protection
Voltage
Protection
Voltage
V
V
300mA/150mA Dual CMOS LDO Linear Regulator
300mA/150mA Dual CMOS LDO Linear Regulator
Over -
91%
Over -
91%
REF
REF
Applications Information
To assure the maximum possible performance is obtained
from the AAT3242, please refer to the following applica-
tion recommendations.
Input Capacitor
A 1μF or larger capacitor is typically recommended for
C
for basic LDO regulator operation; however, if the
AAT3242 is physically located more than three centime-
ters from an input power source, a C
needed for stable operation. C
closely to the device V
values greater than 1μF will offer superior input line
transient response and will assist in maximizing the
highest possible power supply ripple rejection.
Ceramic, tantalum, or aluminum electrolytic capacitors
may be selected for C
ESR requirement for C
IN
in most applications. A C
-
+
-
+
GND
PRODUCT DATASHEET
PRODUCT DATASHEET
IN
IN
IN
; however, for 300mA LDO regu-
. There is no specific capacitor
pin as practically possible. C
OUTA
POKA
OUTB
POKB
IN
AAT3242
AAT3242
capacitor is not required
IN
should be located as
IN
capacitor will be
IN
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