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PDF AP3432 Data sheet ( Hoja de datos )
| Número de pieza | AP3432 | |
| Descripción | Step-down DC-DC Converter | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Data Sheet
1.5MHz, 2.5A, Step-down DC-DC Converter
AP3432
General Description
The AP3432 is a high efficiency step-down DC-DC
voltage converter. The chip operation is optimized
by peak-current mode architecture with built-in
synchronous power MOSFET switchers.
The oscillator and timing capacitors are all built-in
providing an internal switching frequency of 1.5MHz
that allows the use of small surface mount inductors
and capacitors for portable product implementations.
Additional features including Soft Start (SS), Under
Voltage Lock Out (UVLO), Thermal Shutdown
Detection (TSD) and short circuit protection are
integrated to provide reliable product applications.
The device is available in adjustable output voltage
versions ranging from 0.8V to VIN when input
voltage range is from 2.7V to 5.5V, and is able to
deliver up to 2.5A.
The AP3432 is available in DFN-3×3-6 package.
Features
• High Efficiency Buck Power Converter
• Low RDS(ON) Internal Switches : 100m
• Output Current: 2.5A
• Adjustable Output Voltage from 0.8V to VIN
• Wide Operating Voltage Range: 2.7V to 5.5V
• 4Built-in Power Switchers for Synchronous
Rectification with High Efficiency
• Feedback Voltage Allows Output: 800mV
• 1.5MHz Switching Frequency
• Thermal Shutdown Protection
• Low Drop-out Operation at 100% Duty Cycle
• No Schottky Diode Required
• Input Over Voltage Protection
Applications
• LCD TV
• Set Top Box
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
DFN-3×3-6
Figure 1. Package Type of AP3432
Jun. 2013 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.5MHz, 2.5A, Step-down DC-DC Converter
AP3432
Electrical Characteristics
VIN_SW=VIN_A=VEN=5V, VOUT=1.2V, VFB=0.8V, L=3.3H, CIN=4.7F, COUT=22F, TA=25°C, unless
otherwise specified.
Parameter
Input Voltage Range
Shutdown Current
Active Current
Regulated Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak Inductor
Current
Oscillator Frequency
PMOSFET RON
NMOSFET RON
EN High-level Input
Voltage
EN Low-level Input
Voltage
EN Input Current
Soft-start time
Maximum
Cycle
Duty
Under Voltage Lock
Out
Hysteresis
OVP Threshold
Hysteresis on OVP
Thermal Shutdown
Symbol
VIN
IOFF
ION
VFB
VOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
VEN_H
VEN_L
IEN
tSS
DMAX
VUVLO
VOVP
TSD
Conditions
VEN=0V
VFB=0.95V
Min Typ Max Unit
2.7 5.5 V
1 A
310 A
For Adjustable Output Voltage 0.784 0.8 0.816
VIN=2.7V to 5.5V, IOUT=10mA
to 2.5A
-3
3
V
%
3.0 3.5
A
ISW=0.75A
ISW=0.75A
1.2 1.5 1.8 MHz
100 m
100 m
1.5 V
Rising
Falling
Hysteresis
Hysteresis=30°C
0.4 V
1
400
A
S
100 %
2.4
V
2.3
0.1 V
5.8 5.9 6.0 V
300 400 500 mV
150 °C
Jun. 2013 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
5 Page 
1.5MHz, 2.5A, Step-down DC-DC Converter
Typical Performance Characteristics (Continued)
Data Sheet
AP3432
VEN
2V/div
VIN
1V/div
IOUT
1A/div
VOUT
1V/div
Time 200s/div
Figure 24. EN Pin H to L
(VIN=5V, VOUT=3.3V, IOUT=1A)
VSW
2V/div
VIN
1V/div
IOUT
1A/div
VOUT
1V/div
Time 200s/div
Figure 25. Soft Start Function
(VIN=5V, VOUT=3.3V, IOUT=0A)
VSW
2V/div
VIN
1V/div
IOUT
1A/div
VOUT
1V/div
IOUT
200mA/div
VIN
1V/div
VOUT
1V/div
Time 400s/div
Figure 26. Soft Start Function
(VIN=5V, VOUT=3.3V, IOUT=1A)
Time 100s/div
Figure 27. OTP Function
Jun. 2013 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AP3432.PDF ] | |
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