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PDF APE8957 Data sheet ( Hoja de datos )
| Número de pieza | APE8957 | |
| Descripción | 7A ULTRA LOW DROPOUT LINEAR REGULATOR | |
| Fabricantes | Advanced Power Electronics | |
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Advanced Power
Electronics Corp.
APE8957
7A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
DESCRIPTION
Ultra Low Dropout Voltage 150mV at 7A 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
The APE8957 is a 7A 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 APE8957 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 APE8957
can be enabled by other power system. Pulling and holding
the EN pin below 0.4V shuts off the output.
The APE8957 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.
TYPICAL APPLICATION
VCNTL=5V
C1
1uF
R3
1K
6
VCNTL
5
VIN
7
POK
8
EN
4
VOUT
APE8957
3
VOUT
1
GND
2
FB
VIN=1.5V
C2
100uF
C3
0.1uF
R1
1K C6
12~48nF
R2
2K
V O UT=1 .2 V /7 A
C4
220uF
C5
0.1uF
VCNTL=5V
R4
5.1-15Ω
C1
1uF
R3
1K
6
VCNTL
5
VIN
7
POK
4
VOUT
APE8957
8
EN
3
VOUT
1
GND
2
FB
VOUT=VFB x (1+R1/R2)
VFB=0.8V
C2
22uF
VIN=1.5V
R1
39K
R2
78K
V O UT=1 .2 V /7 A
C4
30pF
C3
22uF
Figure 1. Output Capacitor with ESR > 20mΩ
Figure 2. Output Capacitor is MLCC
PACKAGE ORDERING INFORMATION
APE8957
Package type
MP : ESOP-8
Data and specifications subject to change without notice
1
200809103
1 page  
Advanced Power
Electronics Corp.
FUNCTION DESCRIPTION(Cont.)
APE8957
Output Voltage Regulation
An error amplifier working with a temperature compensated 0.8V reference and
an output NMOS regulates output to the preset voltage. The error amplifier designed with
high bandwidth and DC gain provides very fast transient response and less load
regulation. It compares the reference with the feedback voltage and amplifies the
difference to drive the output NMOS which provides load current from VIN to VOUT.
Under Voltage Protection (UVP)
The APE8957 monitors the voltage on FB pin after soft-start process is finished.
Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls
below the under-voltage threshold, the UVP circuit shuts off the output immediately.
After a while, the APE8957 starts a new soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8957. When the
junction temperature exceeds +150°C, a thermal sensor turns off the output NMOS,
allowing the device to cool down. The regulator regulates the output again through
initiation of a new soft-start cycle after the junction temperature cools by 50°C, resulting
in a pulsed output during continuous thermal overload conditions.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet APE8957.PDF ] | |
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