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Diodes Semiconductor Electronic Components Datasheet

AP3005 Datasheet

2A 420kHz PWM BUCK DC-DC CONVERTER

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AP3005 pdf
Data Sheet
2A 420kHz PWM BUCK DC-DC CONVERTER
AP3005
General Description
The AP3005 is a 420kHz fixed frequency PWM buck
(step-down) DC-DC converter, capable of driving a
2A load with high efficiency, low ripple and excellent
line and load regulation. The device includes a
voltage reference, an oscillation circuit, an error
amplifier, an internal PMOS and etc.
The PWM control circuit is able to adjust the duty
ratio linearly from 0 to 100%. The enable function,
over current protection function, short circuit
protection function and soft-start function are built
inside. When OCP or SCP happens, the operation
frequency will be reduced from 420kHz to 40kHz.
An internal compensation block is employed to
minimize external components.
The AP3005 serves as an ideal power supply unit for
portable devices, especially for chip set power in
portable systems. It’s widely used for PDVD, LCD
monitor and DPF chip set powers.
Features
2A Constant Output Current
• 130mRDSON Internal Power MOSFET Switch
• Up to 94% Efficiency
• Fixed 420kHz Frequency
• Wide 4.75V to 25V Input Voltage Range
• Output Voltage Adjustable from 0.8V to 21V
• Built in Thermal Shutdown Function
• Built-in Current Limit Function
• Built-in Soft-Start Function
• Support Ceramic or Electrolytic Capacitors
Applications
Portable DVD
• LCD Monitor/LCD TV
• Digital Photo Frame
• ADSL
• Set-up Box
The AP3005 is available in SOIC-8 package.
Mar. 2011 Rev. 1. 4
SOIC-8
Figure 1. Package Type of AP3005
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3005 Datasheet

2A 420kHz PWM BUCK DC-DC CONVERTER

No Preview Available !

AP3005 pdf
2A 420kHz PWM BUCK DC-DC CONVERTER
Pin Configuration
M Package
(SOIC-8)
Data Sheet
AP3005
NC 1
VIN 2
SW 3
GND 4
8 NC
7 EN
6 COMP
5 FB
Figure 2. Pin Configuration of AP3005 (Top View)
Pin Description
Pin Number Pin Name
Function
1, 8 NC No Connection
Supply Voltage Input Pin. The AP3005 operates from a 4.75V to 25V DC
2 VIN voltage. Bypass VIN to GND with a suitable large capacitor to eliminate noise
on the input
3
SW
Power Switch Output Pin. SW is the switch node that supplies power to the
output
4 GND Ground Pin.
Feedback Pin. Through an external resistor divider network, FB senses the
output voltage and regulates it. To prevent current limit run away in a short
5 FB circuit fault condition, the frequency feedback comparator lowers the oscillator
frequency to 40kHz when the FB voltage is below 0.52V. The feedback
threshold voltage is 0.8V
Compensation Pin. This pin is the output of the error amplifier. Frequency
6 COMP compensation is done at this pin by connecting a series RC to ground (parallel a
C if necessary)
7
EN
Enable Pin. Drive EN pin high to turn on the device, drive it low to turn off.
Default of this pin is high level
Mar. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
2


Part Number AP3005
Description 2A 420kHz PWM BUCK DC-DC CONVERTER
Maker BCD Semiconductor
Total Page 11 Pages
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