APS39903 Datasheet, PDF (1/17 Pages) Diodes Incorporated – PUMP EXPRESSTM COMPATIBLE AC/DC PSR SWITCHER

A Product Line of
Diodes Incorporated
APS39903
PUMP EXPRESS^TM COMPATIBLE AC/DC PSR SWITCHER
Description
Pin Assignments
The APS39903 is a high accuracy and low cost switching mode
power supply switcher for battery charger/adapter applications. It is
consists of a primary side regulation controller and a high voltage
transistor. The controller regulates the output voltage and current in
the primary side by piece-wise Pulse Frequency Modulation (p-PFM)
in discontinuous conduction mode (DCM). The switcher uses adaptive
source current to optimize driving current to reduce driving loss. The
system operating frequency reduces linearly from heavy load to light
load in each interval of the p-PFM, and enters constant current mode
when the load current is equal to the maximum system output current.
The output voltage and output current limit of APS39903 can be
adjusted based on the patterns of load current aligned to MTK Pump
Express protocol.
(Top View)
CPC 1
FB 2
VCC 3
CS ₄
7 GND
6C
5C
SO-7
The APS39903 provides operating frequency Jitter function from light
to full load range to improve the power supply EMI performance. The
APS39903 also has built-in fixed cable voltage drop compensation
(6% of nominal system output voltage) and adjustable line voltage
compensation.
The APS39903 can work individually to achieve Ultra-Low standby
power under 5V output.
The APS39903 is packaged in SO-7.
Applications
 Adapters/Chargers
Features
 Compatible to MediaTek Pump Express^TM Protocol
 Ultra-Low Standby Power Consumption
 Built-in NPN Transistor with 700VCBO
 Valley-turn On to Reduce Switching Loss and Benefit for EMI
 Piece-wise Frequency Reduction to Enhance Conversion Efficiency
and Suppress Audio Noise
 ±5% Constant Voltage Accuracy for 5V Output
 Audio Noise Suppression
 Open Circuit Protection (OCkP)
 Current Sense Resistor Short Protection
 Over Voltage Protection (OVP)
 Over Temperature Protection (OTP)
 Short Circuit Protection (SCP) with Hiccup
 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) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
APS39903
Document number: DS37226 Rev. 2 - 2
1 of 17
www.diodes.com
October 2014
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