HT7465 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – 2A Step-Down DC to DC Converter

HT7465
2A Step-Down DC to DC Converter
Feature
• Input voltage range: 4.75V to 24V
• Variable output voltage range: 0.92V to 20V
• 2A output current
• Efficiency up to 92%
• 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 and 10-pin MSOP 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 HT7465 is a 2A high efficiency step-down DC-
DC converter which includes a fully integrated MOS
power transistor. The device uses a current-mode
control operating methodology and can operate over a
wide input voltage range of 4.75V to 24V for which it
can provide a stable adjustable output voltage.
The device includes over temperature protection,
over current protection and under voltage lockout
protection, features which combine to prevent device
damage due to overload conditions. In its shutdown
mode the regulator draws a mere 20uA of supply
current.
The device is available in 8-pin SOP and 10-pin
MSOP package types and provides a very compact
system solution with a minimum of external
components.
Application Circuit
VIN
4.75~24V
10uF
C1
10nF
C2
VIN
BS
EN
SW
HT7465
SS
GND
FB
COMP
V_OUT
=
V_FB
×

R₁ + R
R₂
2

L
VOUT
Efficiency vs Output Current
B230A

R1
10nF
C3
R3
C5
C4
R2
22uF
C6
Rev. 1.00
1
September 02, 2011