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HT3420

HOTCHIP
Part Number HT3420
Manufacturer HOTCHIP
Description 2A 28V Synchronous Buck Converter
Published Aug 12, 2015
Detailed Description Features z 2A Output Current Wide 4.5V to 28V Operating Input Range z Integrated Power MOSFET switches z Output Adjustab...
Datasheet PDF File HT3420 PDF File

HT3420
HT3420

Overview
Features z 2A Output Current Wide 4.
5V to 28V Operating Input Range z Integrated Power MOSFET switches z Output Adjustable from 0.
925V to 0.
8Vin z Up to 96% Efficiency z Programmable Soft-Start z Stable with Low ESR Ceramic Output Capacitors z Fixed 340KHZ Frequency z Cycle-by-Cycle Over Current Protection z Short Circuit Protection z Input Under Voltage Lockout z Package： SOP-8L HT3420 2A 28V Synchronous Buck Converter General Description The HT3420 is a monolithic synchronous buck regulator.
The device integrates 95 mΩ MOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.
5V to 28V.
Current mode control provides fast transient response and cycleby-cycle current limit.
An adjustable softstart prevents inrush current at turn on.
Applications z Distributed Power Systems z Networking Systems z FPGA, DSP, ASIC Power Supplies z Green Electronics/ Appliances z Notebook Computers Typical Application Circuit 1 of 15 Ordering Information HT3420 Pin Assignments Pin Descriptions Pin Number 1 2 3 4 5 6 Name BS VIN SW GND FB COMP 7 EN 8 SS BS 1 VIN 2 SW 3 GND 4 SOP-8L (TOP View) 8 SS 7 EN 6 COMP 5 FB Description Bootstrap.
This pin acts as the positive rail for the high-side switch’s gate driver.
Connect a 0.
01uF capacitor between BS and SW.
Input Supply.
Bypass this pin to GND with a low ESR capacitor.
See Input Capacitor in the Application Information section.
Switch Output.
Connect this pin to the switching end of the inductor.
Ground.
Feedback Input.
The voltage at this pin is regulated to 0.
925V.
Connect to the resistor divider between output and ground to set output voltage.
Compensation Pin.
See Stability Compensation in the Application Information section.
Enable Input.
When higher than 2.
7V, this pin turns the IC on.
When lower than 1.
1V, this pin turns the IC off.
Output voltage is discharged when the IC is off.
This pin should not be left open.
Recommend to put a 100KΩ pull up resistor to Vin for start up.
Soft-Star...


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