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AP65450
4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Description
Pin Assignments
The AP65450 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 TV and monitor.
( Top View )
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 SPCAP or POSCAP and ultra-low ESR ceramic capacitors.
The adaptive on-time control supports seamless transition between
continuous conduction mode (CCM) at higher load conditions and
discontinuous conduction mode (DCM) at lighter load conditions.
EN
1
8
VIN
FB
2
7
BS
VREG5
3
6
SW
SS
4
5
GND
DCM allows AP65450 to maintain high efficiency at light load
conditions. The AP65450 also features programmable soft-start,
UVLO, OTP and OCP to protect the circuit.
SO-8EP
This IC is available in SO-8EP package.
Features
Applications
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
4A Continuous Output Current
650kHz Switching Frequency
Built-in Over Current 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)
Notes:
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
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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