Diodes AP3417C - Manual

AP3417C
Document number: DS36516 Rev. 1 - 0
1 of 11
www.diodes.com
September 2013
© Diodes Incorporated
AP3417C
PRELIMINARY DATASHEET
A Product Line of
Diodes Incorporated
1.5MHZ SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Description
The AP3417C 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 MOSFET switchers. The
oscillator and timing capacitors are all built-in providing an internal
switching frequency of 1.5MHz 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 version ranging
from 0.6V to 0.9×V
IN
when input voltage range is from 2.5V to 5.5V,
and is able to deliver up to 1A. It is also available in fixed voltage
versions of 1.2V, 1.8V and 3.3V without external feedback resistance.
The AP3417C is available in SOT-23-5 and DFN-2×2-6 packages.
Features
 High Efficiency Buck Power Converter
 Wide Input Voltage Range: 2.5V to 5.5V
 Adjustable Output Voltage: 0.6V to 0.9×V
IN
 Low R
DS(ON)
Internal Switches:200m  (V
IN
= 5V)
 Built-in Power Switches for Synchronous Rectification with High
Efficiency
 Output Current: 1.0A
 Feedback Voltage: 600mV
 1.5MHz Constant Frequency Operation
 Thermal Shutdown Protection
 Low Dropout Operation at 100% Duty Cycle
 No Schottky Diode Required
 Input Over Voltage Protection
 Output Over Voltage Protection
 Over Current Protection
Pin Assignments
K Package DN Package
(SOT-23-5) (DFN-2×2-6)
EN
GND
LX
FB
VIN
1
2
3 4
5
Applications
 Post DC-DC Voltage Regulation
 PDA and Notebook Computer
Typical Applications Circuit
For ADJ Version