HM1460DR datasheet(2/19 Pages) HMSEMI

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Pin Assignments

FUNCTION

NO.

NAME

SOP-8P

TDFN3x3-10

BOOT

This pin provides the bootstrap voltage to the high-side gate driver for

driving the N-channel MOSFET. An external capacitor from PHASE to

BOOT, an internal diode, generates the bootstrap voltage for the high-side

gate driver (UGATE).

UGATE

High-side Gate Driver Output. This pin is the gate driver for high-side

MOSFET.

GND

Signal and Power ground. Connecting this pin to system ground.

LGATE

Low-side Gate Driver Output and Over-Current Setting Input. This pin is the

gate driver for low-side MOSFET. It also used to set the maximum inductor

current. Refer to the section in “Function Description” for detail.

VCC

Power Supply Input. Connect a nominal 5V to 12V power supply voltage to

this pin.

power-on-reset

function

monitors

the

input

voltage

this

pin.

is recommended that a decoupling

capacitor (1 to 10 F) is connected to GND for noise decoupling.

Feedback Input of Converter. The converter senses feedback voltage via FB

and regulates the FB voltage at 0.8V. Connecting FB with a resistor-divider

from the output sets the output voltage of the converter.

COMP

This is a multiplexed pin. During soft-start and normal converter operation,

this pin represents the output of the error amplifier. It is used to

compensate the regulation control loop in combination with the FB pin.

Pulling COMP low (VDISABLE = 0.4V max.) will shut down the controller. When

the pull-down device is released, the COMP pin will start to rise. When the

COMP pin rises above the VDISABLE trip point, the HM1640 will begin a new

initialization and soft-start cycle.

Single Buck Voltage Mode PWM Controller

HM1460

HM1460DR Datasheet(PDF) 2 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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