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Diodes Semiconductor Electronic Components Datasheet

AP3435 Datasheet

Synchronous Step Down DC-DC Converter

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AP3435 pdf
Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
General Description
The AP3435 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
(2.7VVIN5.5V), and is able to deliver up to 3.5A.
The AP3435 is available in PSOP-8 package.
Features
• High Efficiency Buck Power Converter
• Output Current: 3.5A
• Low RDS(ON) Internal Switches:100m(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
• 1.0MHz Constant Frequency Operation
• 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
Dec. 2012 Rev. 1. 0
PSOP-8
Figure 1. Package Type of AP3435
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3435 Datasheet

Synchronous Step Down DC-DC Converter

No Preview Available !

AP3435 pdf
Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
Pin Configuration
MP Package
(PSOP-8)
18
27
36
45
Figure 2. Pin Configuration of AP3435 (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. Receive the feedback voltage from a
resistive divider connected across the output
Chip enable pin. Active high, internal pull-high with
200kΩ resistor
Power switch ground pin
Switch output pin
Power supply input for the MOSFET switch
Dec. 2012 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2


Part Number AP3435
Description Synchronous Step Down DC-DC Converter
Maker BCD Semiconductor
Total Page 17 Pages
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