APE8903B Datasheet, PDF (1/10 Pages) Advanced Power Electronics Corp. – 3A ULTRA LOW DROPOUT LINEAR REGULATOR

Advanced Power
Electronics Corp.
APE8903B
3A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
Ultra Low Dropout 0.23V(typical) @ 2A Output
Current for 1.2V Output Voltage
Low ESR Output Capacitor (Multi-layer Chip
Capacitors (MLCC)) Applicable
EN Pull-low for APE8903BMP-A
EN Pull-high for APE8903BMP-B
Fast Transient Response
Adjustable Output Voltage by External Resistors
Power-On-Reset Monitoring on Both VCNTL
and VIN Pins
Internal Soft-Start
Under-Voltage Protection
Current-Limit and Thermal Shutdown Protection
Power-OK Output with a Delay Time
SO-8 with Exposed Pad Pb-Free Package.
Halogen Free Product
DESCRIPTION
The APE8903B series is a 3A ultra low dropout linear
regulator. This product is specifically designed to provide
well supply voltage for front-side-bus termination on
motherboards and NB applications. The IC needs two supply
voltages, a control voltage for the circuitry and a main supply
voltage for power conversion, to reduce power dissipation
and provide extremely low dropout. The APE8903B series
integrates many functions. A Power-On-Reset (POR) circuit
monitors both supply voltages to prevent wrong operations.
A thermal shutdown and current limit functions protect the
device against thermal and current over-loads. A POK
indicates the output status with time delay which is set
internally. It can control other converter for power sequence.
The APE8903B series can be enabled by other power
system. Pulling and holding the EN pin below 0.4V shuts off
the output.
The APE8903B series is available in ESOP-8 package
which features small size as SO-8 and an Exposed Pad to
reduce the junction-to-case resistance, being applicable in
2~3W applications.
TYPICAL APPLICATION
1. Using an Output Capacitor with ESR≧20mΩ
VCNTL=5V
C1
1uF
ON
OFF
R3
U1
10K
VCNTL
VIN
POK
EN
NC
VOUT
GND
FB
APE8903B
C2
C3
100uF 0.1uF
VIN=1.8V
Vout=1.2V/2A
R1
C6
1K
12~48nF
C4
C5
220uF 0.1u
R2
2K
Data and specifications subject to change without notice
1
201009151