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PDF APE8973 Data sheet ( Hoja de datos )
| Número de pieza | APE8973 | |
| Descripción | 3A ULTRA LOW DROPOUT LINEAR REGULATOR | |
| Fabricantes | Advanced Power Electronics | |
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Advanced Power
Electronics Corp.
APE8973
3A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
Ultra Low Dropout - 0.23V(typical) at 3A
Output Current
Low ESR Output Capacitor (Multi-layer
Chip Capacitors (MLCC) Applicable
0.8V Reference Voltage
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
ESOP-8 and DFN 3x3-10L Pb-Free Package.
DESCRIPTION
The APE8973 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 APE8973 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 APE8973
can be enabled by other power system. Pulling and holding
the EN pin below 0.3V shuts off the output.
The APE8973 is available in ESOP-8 and DFN 3x3-
10L packages which features small size as 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
1K
U1
VCNTL
VIN
POK
EN
VOUT
VOUT
GND
APE8973
FB
C2 C3
100uF 0.1uF
VIN=1.5V
Vout=1.2V/3A
R1 C6
1K
12~48nF
C4 C5
220uF 0.1u
R2
2K
2.Using an MLCC as the Output Capacitor
ESOP- 8
R3
10K
VCNTL=5V
U2
VCNTL
VIN
ON
C1 OFF
1uF
POK
EN
VOUT
VOUT
GND
FB
APE8973MP
VOUT=VFB*(1+R1/R2)
VFB = 0.8V
VIN=1.5V
C3
10uF
R1
39K
C6
56pF
Vout=1.2V/3A
C5
10uF
R2
78K
Data and specifications subject to change without notice
1
201005311
1 page  
Advanced Power
Electronics Corp.
FUNCTION DESCRIPTION
APE8973
Power-On-Reset
A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins
to prevent wrong logic controls. The POR function initiates a soft-start process after the
two supply voltages exceed their rising POR threshold voltages during powering on. The
POR function also pulls low the POK pin regardless the output voltage when the VCNTL
voltage falls below its falling POR threshold.
Internal Soft-Start
An internal soft-start function controls rise rate of the output voltage to limit the
current surge at start-up. The typical soft-start interval is about 2ms.
Current Limit
The APE8973 monitors the current via the output NMOS and limits the maximum
current to prevent load and APE8973 from damages during overload or short circuit
conditions.
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 APE8973 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 APE8973 starts a new soft-start to regulate output.
Thermal Shutdown
A thermal shutdown circuit limits the junction temperature of APE8973. 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. The thermal shutdown
designed.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet APE8973.PDF ] | |
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