Diodes AP4312 - Manual

AP4312
Document number: DS36797 Rev. 1 - 2
1 of 11
www.diodes.com
January 2014
© Diodes Incorporated
AP4312
A Product Line of
Diodes Incorporated
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
Description
The AP4312 is a highly integrated solution for a constant
voltage/constant current mode SMPS application.
The AP4312 contains one 1.21V voltage reference, one low voltage
reference used in current sensing circuit and two operational
amplifiers. The 1.21V voltage reference, combined with one
operational amplifier, makes of an ideal voltage controller for use in
adapters and battery chargers. The low voltage reference, combined
with another operational amplifier, makes of an ideal current limiter for
output low side current sensing.
The AP4312 is fully compatible with AP4306 in functionality and
electrical characteristics except its lower reference voltage for current
control loop, thus higher power efficiency in SMPS applications such
as low power charger can be realized with AP4312 compared to
AP4306.
The AP4312 is available in SOT26 package.
Features
 Constant Voltage and Constant Current Control

Precision Internal Voltage Reference

Low External Component Count

Easy Compensation

Low Supply Current: 180

A
 Current Control Loop Reference: 70mV

Operating Supply Voltage: 1.7V to 18V
 Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
1
2
3 4
5
Pin 1 Mark
6
V
SENSE
GND
V
CTRL
I
CTRL
V
OUT
V
CC
SOT26 (K6 Package)
Applications
 Adapters

Battery Chargers
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.