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AP3431 Datasheet

Synchronous Step Down DC-DC Converter

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AP3431 pdf
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 : 120m(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


Diodes Semiconductor Electronic Components Datasheet

AP3431 Datasheet

Synchronous Step Down DC-DC Converter

No Preview Available !

AP3431 pdf
1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
Pin Configuration
Data Sheet
AP3431
M Package
(SOIC-8)
18
27
36
45
Figure 2. Pin Configuration of AP3431 (Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VCC
NC
GND
FB
EN
PGND
SW
VIN
Function
Supply input for the analog circuit
No connection
Ground pin
Feedback pin. Receives the feedback voltage from a resistive
divider connected across the output
Chip enable pin. Active high, internal pull-high with
200kresistor
Power switch ground pin
Switch output pin
Power supply input for the MOSFET switch
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2


Part Number AP3431
Description Synchronous Step Down DC-DC Converter
Maker BCD Semiconductor
Total Page 19 Pages
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