NOT RECOMMENDED FOR NEW DESIGN
USE AP3428/A
AP3417C
1.5MHz SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Description
Pin Assignments
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.
(Top View)
(Top View)
Pin 1 Mark
EN
1
GND
2
LX
3
Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal
Shutdown Detection (TSD) and Short Circuit Protection are designed
to provide reliable product applications.
5
4
FB
VIN
SOT-23-5
The device is available in adjustable output voltage version ranging
from 0.6V to 0.9×VIN when input voltage range is from 2.5V to 5.5V,
NC
1
EN
2
VIN
3
EP
6
FB
5
GND
4
LX
W-DFN2020-6 (Type US)
and is able to deliver up to 1A.
Applications
The AP3417C is available in SOT-23-5 and W-DFN2020-6 (Type US)
packages.
Post DC-DC Voltage Regulation
PDA and Notebook Computer
Features
High Efficiency Buck Power Converter
Wide Input Voltage Range: 2.5V to 5.5V
Adjustable Output Voltage: 0.6V to 0.9×VIN
Low RDS(ON) Internal Switches: 200m (VIN = 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
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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