Advanced Power
Electronics Corp.
FEATURES
Ultra Low Dropout Voltage 200mV at 5A Output Current
Low ESR Output Capacitor (MLCC) Applicable
0.8V Reference Voltage
Fast Transient Response
Current Limit and Thermal Shutdown Protection
Adjustable Output Voltage by External Resistors
Power-on-Reset Monitoring on Both VCNTL and
VIN Pins
Under Voltage Protection
Power OK Output with a Delay Time
Internal Soft-Start
SOP-8 with Exposed Pad Package
RoHS Compliant & Halogen Free
APE8955
DESCRIPTION
The APE8955 is a 5A ultra low dropout linear regulator.
The product is specifically designed to provide well supply
voltage for front side bus termination on motherboard and
NB applications. The IC needs two supply voltages, a
voltage for the circuitry and a main supply voltage for power
conversion, to reduce power dissipation and provide
extremely low dropout. The APE8955 integrates many
functions. A Power-on-Reset(POR) circuit monitors both
supply voltage to prevent wrong operations. A thermal
shutdown and current limit functions protect the device
against thermal and current over-load. A POK indicates the
output status with time delay which is set internally. It can
control other converter for power sequence. The APE8955
can be enabled by other power system. Pulling and holding
the EN pin below 0.4V shuts off the output.
The APE8955 is available in ESOP-8 package which
features small size as SO-8 and exposed pad to reduce the
junction-to-case resistance, being applicable in 2~3W
applications.
5A ULTRA LOW DROPOUT LINEAR REGULATOR
TYPICAL APPLICATION
R3
1K
VCNTL=5V
R3
1K
VCNTL=5V
R4
5.1-15Ω
6
VCNTL
VIN
5
VIN=1.5V
6
VCNTL
VIN
5
C2
100uF
VIN=1.5V
7
POK
VOUT
4
C3
0.1uF
7
POK
VOUT
4
C2
22uF
C1
1uF
APE8955
8
EN
VOUT
3
R1
1K
C6
12~48nF
R2
2K
VOUT=1.2V/5A
C1
1uF
APE8955
8
EN
VOUT
3
VOUT=1.2V/5A
R1
39K
1
GND
FB
2
1
C4
220uF
C5
0.1uF
GND
FB
2
C4
30pF
C3
22uF
R2
78K
VOUT=VFB x (1+R1/R2)
VFB=0.8V
Figure 1. Output Capacitor with ESR > 20mΩ
Figure 2. Output Capacitor is MLCC
PACKAGE ORDERING INFORMATION
APE8955
Package type
MP : ESOP-8
Data and specifications subject to change without notice
1
20080910C
A-POWER [ ADVANCED POWER ELECTRONICS CORP. ]
