AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
Functional Block Diagram
INA
Over-Current
Protection
Over -
Temperature
Protection
-
+
OUTA
ENA
+
Error
Amplifier
-
POKA
Voltage
Reference
91%
V
REF
INB
Over-Current
Protection
Over -
Temperature
Protection
+
Error
Amplifier
-
-
+
OUTB
POKB
ENB
Voltage
Reference
91%
V
REF
GND
Functional Description
The AAT3242 is a high performance dual LDO regu-
lator with two Power OK pins. The first regulator (A)
sources 300mA of current while the second (B) regu-
lator can deliver 150mA. Each regulator has an inte-
grated Power OK comparator which indicates when
the respective output 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 ther-
mal protection in case of adverse operating condi-
tions. 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 maxi-
mum output current loads.
3242.2005.01.1.4
9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
