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PDF APE8951 Data sheet ( Hoja de datos )
| Número de pieza | APE8951 | |
| Descripción | 1.5A ULTRA LOW DROPOUT LINEAR REGULATOR | |
| Fabricantes | Advanced Power Electronics | |
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Hay una vista previa y un enlace de descarga de APE8951 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Advanced Power
Electronics Corp.
APE8951
1.5A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
Ultra Low Dropout Voltage 250mV at 1.5A
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
DESCRIPTION
The APE8951 is a 1.5A 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 APE8951 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 APE8951
can be enabled by other power system. Pulling and holding
the EN pin below 0.4V shuts off the output.
The APE8951 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
V IN
7
POK
8
EN
4
VOUT
APE8951
3
VOUT
1
G ND
2
FB
VIN=1.5V
C4
220uF
C3
0.1uF
R1
1K C6
12~48nF
R2
2K
V O UT=1 .2 V /1 .5 A
C4
220uF
C5
0.1uF
VCNTL=5V
C1
1uF
R3
1K
6
VCNTL
5
VIN
7
POK
8
EN
4
V O UT
APE8951
3
V O UT
1
GND
2
FB
VOUT=VFB x (1+R1/R2)
VFB=0.8V
C2
22uF
V IN= 1 .5 V
R1
39K
R2
78K
V O UT=1 .2 V /1 .5 A
C4
56pF
C3
22uF
Figure 1. Output Capacitor with ESR > 20mΩ
Figure 2. Output Capacitor is MLCC
ORDERING INFORMATION
APE8951X - HF
Package Type
MP : ESOP-8
Halogen Free
Data and specifications subject to change without notice
1
20100107D
1 page  
Advanced Power
Electronics Corp.
FUNCTION DESCRIPTION(Cont.)
APE8951
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 APE8951 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 APE8951 starts a new soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8951. 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 8 Páginas | |
| PDF Descargar | [ Datasheet APE8951.PDF ] | |
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