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AP3417B Datasheet

1.4MHz High Efficiency Synchronous DC-DC Buck Converter

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AP3417B pdf
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417B
General Description
The AP3417B is a 1.4MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 1.2A load with high
efficiency, excellent line and load regulation. The
device integrates synchronous P-channel and
N-channel power MOSFET switches with low
on-resistance. It is ideal for powering portable
equipment that runs from a single Li-ion battery.
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3417B. This feature greatly simplifies the
design of switch-mode power supplies.
The AP3417B is available in SOT-23-5 package.
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltage: 0.6V to VIN
• ADJ Output
• Fixed 1.4MHz Frequency
• High Efficiency up to 95%
• Output Current: 1.2A
• Current Mode Control
• 100% Duty Cycle in Dropout
• Built-in Over Current Protection
• Built-in Short Circuit Protection
• Built-in Thermal Shutdown Protection
• Built-in UVLO Function
• Built-in Soft-start
• Built-in Input Over Voltage Protection (IOVP)
Applications
• Set-top Box
• Datacom
• Portable Device
Smart Phone
Jan. 2013 Rev. 1. 0
SOT-23-5
Figure 1. Package Type of AP3417B
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3417B Datasheet

1.4MHz High Efficiency Synchronous DC-DC Buck Converter

No Preview Available !

AP3417B pdf
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417B
Pin Configuration
K Package
(SOT-23-5)
EN 1
GND 2
SW 3
5 FB
4 VIN
Figure 2. Pin Configuration of AP3417B (Top View)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
EN
GND
SW
VIN
FB
Function
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC is
in shutdown mode, all functions are disabled to decrease the
supply current below 1µA
Ground pin
Power switch output pin. Inductor connection to drain of the
internal PFET and NFET switches
Supply input pin. Bypass to GND with a 4.7µF or greater
ceramic capacitor
This is the feedback pin of the device. Connect this pin directly
to the output if the fixed output voltage version is used. For the
adjustable version, an external resistor divider is connected to
this pin
Jan. 2013 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2


Part Number AP3417B
Description 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
Maker BCD Semiconductor
Total Page 13 Pages
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