HT7466 Datasheet, PDF (1/9 Pages) Holtek Semiconductor Inc – 3A Step-Down DC to DC Converter

HT7466
3A Step-Down DC to DC Converter
Feature
• Input voltage range: 4.75V to 24V
• Variable output voltage range: 1.222V to 20V
• 3A output current
• Efficiency up to 91%
• Fixed 380kHz operating frequency
• 20mA shutdown current
• Internal power MOSFET switch
• Stable operation using low ESR ceramic capacitors
• Over temperature protection
• Cycle-by-cycle over current protection
• Soft-start function
• Under voltage lockout protection
• 8-pin SOP package
Applications
• Battery chargers
• Distributed power systems
• LED power supplies
• DSL modems
• Linear regulator pre power processing
• Set-Top-Boxes, DVD players, LCD displays
General Description
The HT7466 is a DC-DC buck regulator. The built-
in high driver NMOS provides a monolithic solution
for high efficiency step-down DC-DC converter. With
3A output current, the wide input voltage range and
stable output voltage regulation can widely use in all
kinds of application, like communication, power for
high power LED, battery charger, etc. The protection
function include over current and over temperature
protection. The soft start function prevent inrush
supply current and output overshoot when initial
startup. The under voltage lockout is set to 4.1V. It
prevents abnormal situation occurring.
The HT7466 requires a minimum number of standard
external components and is available in a 8-pin SOP
package for small area PCB application.
Application Circuit
VIN
4.75~24V
10uF
C1
10nF
C2
VIN
BS
EN
SW
HT7466
SS
GND
FB
COMP
10nF
C3
R3
C5
C4
Efficiency vs Output Current
V_OUT
=
V_FB
×

R₁ + R
R₂
2

L
VOUT
B330A

R1
R2
22uF
C6
Rev. 1.00
1
September 02, 2011