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AP65552
Document number: DS37306 Rev. 3 - 2
1 of 13
www.diodes.com
August 2015
© Diodes Incorporated
AP65552
5A, 18V, 650kHz ADAPTIVE CCM/COT STEP-DOWN CONVERTER
Description
The AP65552 is an adaptive, constant on-time mode synchronous
buck converter providing high efficiency, excellent transient response
and high DC output accuracy for low-voltage regulation in digital
TVs and monitors.
The constant-on-time control scheme handles wide input/output
voltage ratios and provides low external component count. The
internal proprietary circuit enables the device to adopt both low
equivalent series resistance (ESR) Output Capacitors, such as
SP-CAP or POSCAP and ultra-low ESR ceramic capacitors.
The AP65552 features programmable soft-start, UVLO, OTP and
OCP to protect the circuit.
This IC is available in SO-8EP package.
Features
Fixed-Frequency Emulated Constant On-Time Control
Good Stability Independent of the Output Capacitor ESR
Fast Load Transient Response
Synchronous Rectification: 65mΩ Internal High-Side Switch and
36mΩ Internal Low-Side Switch
Wide Input Voltage Range: 4.5V to 18V
Output Voltage Range: 0.76V to 6V
5A Continuous Output Current
650kHz Switching Frequency
Built-in Overcurrent Limit
Built-in Thermal Shutdown Protection
Programmable Soft-Start
Pre-biased Start-Up
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
SW
VREG5
SS
EN
BS
GND
VIN
( Top View )
1
2
3
4
8
7
6
5
FB
SO-8EP
Applications
Gaming Consoles
Flat Screen TV Sets and Monitors
Set Top Boxes
Distributed Power Systems
Home Audio
Consumer Electronics
Network Systems
FPGA, DSP and ASIC Supplies
Green Electronics
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.
Typical Applications Circuit
AP65552
L1
1.5μH
R1
8.25kΩ
R2
22.1kΩ
C5
0.1µF
C2
44μF
C1
20μF
C4
8.2nF
ON
OFF
8
IN
4
SS
1
EN
3
VREG5
6
SW
7
BST
2
FB
C3
1µF
5
GND
INPUT
OUTPUT
V
OUT
1.05V
V
IN
12V
Figure 1 Typical Application Circuit
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