AP3431 Datasheet PDF - BCD Semiconductor

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AP3431
BCD Semiconductor

Part Number AP3431
Description Synchronous Step Down DC-DC Converter
Page 19 Pages


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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 : 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
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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



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1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
Functional Block Diagram
Data Sheet
AP3431
Figure 3. Functional Block Diagram of AP3431
Ordering Information
AP3431 A -
Package
SOIC-8
Circuit Type
Package
M: SOIC-8
Temperature
Range
-40 to 80°C
Part Number
AP3431M-G1
AP3431MTR-G1
G1:Green
Blank: Tube
TR: Tape & Reel
Marking ID
3431M-G1
3431M-G1
Packing Type
Tube
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" in the part number, are RoHS compliant and
green.
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3



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1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter
Absolute Maximum Ratings (Note 1)
Data Sheet
AP3431
Parameter
Supply Input for the Analog Circuit
Power Supply Input for the MOSFET Switch
SW Pin Switch Voltage
Enable Voltage
SW Pin Switch Current
Power Dissipation (on PCB, TA=25°C)
Thermal Resistance (Junction to Ambient, Simulation)
Junction Temperature
Operating Temperature
Storage temperature
ESD (Human Body Model)
ESD (Machine Model)
Symbol
VCC
VIN
VSW
VEN
ISW
PD
θJA
TJ
TOP
TSTG
VHBM
VMM
Value
0 to 6.0
0 to 6.0
-0.3 to VIN+0.3
-0.3 to VIN+0.3
2.9
1.45
68.63
160
-40 to 85
-55 to 150
2000
200
Unit
V
V
V
V
A
W
°C/W
°C
°C
°C
V
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Supply Input Voltage
Junction Temperature Range
Ambient Temperature Range
Symbol
VIN
TJ
TA
Min
2.7
-40
-40
Max
5.5
125
80
Unit
V
°C
°C
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
4



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