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PDF AP3431 Data sheet ( Hoja de datos )
| Número de pieza | AP3431 | |
| Descripción | Synchronous Step Down DC-DC Converter | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP3431 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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Data Sheet
1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
AP3431
General Description
The AP3431 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 MOS switchers. The oscillator
and timing capacitors are all built-in providing an
internal switching frequency of 1MHz that allows
the use of small surface mount inductors and
capacitors for portable product implementations.
Integrated Soft Start (SS), Under Voltage Lock Out
(UVLO), Thermal Shutdown Detection (TSD) and
short circuit protection are designed to provide
reliable product applications.
The device is available in adjustable output voltage
versions ranging from 0.8V to 0.9×VIN when input
voltage range is from 2.7V to 5.5V , and is able to
deliver up to 2.0A.
The AP3431 is available in SOIC-8 package.
Features
• High Efficiency Buck Power Converter
• Output Current: 2A
• Low RDS(ON) Internal Switches : 120mΩ(VIN=5V)
• Adjustable Output Voltage from 0.8V to 0.9×VIN
• Wide Operating Voltage Range: 2.7V to 5.5V
• Built-in Power Switches for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 800mV
• Switching Frequency: 1.0MHz
• Thermal Shutdown Protection
• Internal Soft Start
Applications
• LCD TV
• Set Top Box
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
Nov. 2011 Rev. 1. 0
SOIC-8
Figure 1. Package Type of AP3431
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
AP3431
Electrical Characteristics
VIN=VCC=VEN=5V, VOUT=1.2V, VFB=0.8V, L=2.2µH, CIN=10µF, COUT=22µF, TA=25°C, unless otherwise
specified.
Parameter
Input Voltage Range
Shutdown Current
Active Current
Regulated1Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak
Current
Inductor
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 Threshold
Thermal Shutdown
Symbol
VIN
IOFF
ION
VFB
∆VOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
VEN_H
VEN_L
IEN
tSS
DMAX
TSD
Conditions
VEN=0V
VFB = 0.95V
For Adjustable Output Voltage
VIN=2.7V to 5.5V,
IOUT=0 to 2.0A
VIN = 2.7V to 5.5V
VIN = 5V
VIN = 5V
Rising
Falling
Hysteresis
Hysteresis=30°C
Min Typ Max Unit
2.7 5.5
4
460
V
µA
µA
0.784 0.8 0.816 V
-3 3 %
2.9
1.0
120
120
1.5
A
MHz
mΩ
mΩ
V
0.4
2
450
V
µA
µs
90 %
2.4 V
2.3 V
0.1 V
160 °C
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
5 Page 
1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
Typical Performance Characteristics (Continued)
Data Sheet
AP3431
Figure 24. VOUT Ripple
(VIN=5V, VOUT=3.3V, IOUT=1A)
Figure 25. Dynamic Mode (Rising)
Figure 26. VOUT Ripple
(VIN=5V, VOUT=3.3V, IOUT=2A)
Figure 27. Dynamic Mode (Falling)
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AP3431.PDF ] | |
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