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  Holtek Semiconductor Electronic Components Datasheet  

HT7463B Datasheet

Asynchronous Step Down Converter

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HT7463A/HT7463B
52V/600mA, 1.25MHz/550kHz
Asynchronous Step Down Converter
Features
• Wide Input Voltage Range 4.5V to 52V
• 52V / 0.9Ω Internal Power MOSFET
• 600mA Peak Output Current
• Up to 90% Efficiency
• 1.25MHz (HT7463A) and 550kHz (HT7463B)
Fixed Operating Frequency
• Ultra Low Shutdown Current < 1µA
• Output Short Circuit Protection
• Thermal Shutdown Protection
• Package Type: SOT23-6
Applications
• Power Meters
• Distribution Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
General Description
The HT7463A/B is a current mode buck converter.
With a wide input range from 4.5V to 52V,
the HT7463A/B is suitable for a wide range of
applications such as power conditioning from
unregulated sources. Having a low internal switch
typical RDSON value of 0.9Ω, the device has a good
operating typical efficiency value of 85% and the
added advantage of reduced junction temperature.
The operating frequency is fixed at 1250/550kHz for
the HT7463A/HT7463B respectively. The HT7463A
allows the use of small external components while
still being able to have low output voltage ripple.
A soft-start function can be implemented using the
enable pin and by connecting an external RC circuit
allowing the user to tailor the soft-start time to a
specific application.
Application Circuit
CB
0.1µF
L1
22µH/47µH *3
HT7463A/B
1 CB
SW 6
2 GND
3 FB
VIN 5
EN 4
D1
On/Off
Control
C3
0.1µF
C4
22µF *2
C1
0.1µF
VIN
C2
100µF
VOUT=12V *1
R2
6kΩ / ±1%
R1
84kΩ / ±1%
Note: *1. C4=330μF is recommended to achieve 1‰ output ripple requirement
*2. Set R1=84kΩ and R2=16kΩ for VOUT=5V application
*3. It’s recommended that L1=22μH for HT7463A and L1=47μH for HT7463B
Rev. 1.20
1 July 14, 2017


  Holtek Semiconductor Electronic Components Datasheet  

HT7463B Datasheet

Asynchronous Step Down Converter

No Preview Available !

HT7463A/HT7463B
Block Diagram
VIN
EN
Regulator
UVLO
1.25MHz/550kHz
Oscillator
FB
VCC VREF
OCP
Current
Sense Amp.
VREF
FB
0.794V
Error Amp.
SS/OSP
Current
Comparator
PWM
Comparator
VCC
Control
Logic
OTP
0.9Ω
CB
SW
GND
Pin Assignment
SOT23-6
6 54
463X
Top View
1 23
X means A(1.25MHz)/or B(550kHz)
Rev. 1.20
2 July 14, 2017


Part Number HT7463B
Description Asynchronous Step Down Converter
Maker Holtek Semiconductor
Total Page 16 Pages
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