LTC4440AI-5 Просмотр технического описания (PDF) - Linear Technology

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LTC4440AI-5

High Speed, High Voltage, High Side Gate Driver

Linear Technology 

Features

n Wide Operating VIN Range: Up to 80V

n Rugged Architecture Tolerant of 100V VIN Transients

n Powerful 1.85Ω Driver Pull-Down (with 6V Supply)

n Powerful 1.1A Peak Current Driver Pull-Up

(with 6V Supply)

n 7ns Fall Time Driving 1000pF Load

n 10ns Rise Time Driving 1000pF Load

n Drives Standard Threshold MOSFETs

n TTL/CMOS Compatible Inputs with Hysteresis

n Input Thresholds are Independent of Supply

n Undervoltage Lockout

n Thermally Enhanced 8-Lead MSOP Package

Applications

n Automotive Power Systems

n Telecommunications Power Systems

n Distributed Power Architectures

n Server Power Supplies

n High Density Power Modules

n General Purpose Low or High Side Driver

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Direct

Flux Limit is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents, including 6677210.

LTC4440A-5

High Speed, High Voltage,

High Side Gate Driver

Description

The LTC®4440A-5 is a high frequency high side N-channel

MOSFET gate driver that is designed to operate in applica-

tions with VIN voltages up to 80V. The LTC4440A-5 can

also withstand and continue to function during 100V VIN

transients. The powerful driver capability reduces switch-

ing losses in MOSFETs with high gate capacitances. The

LTC4440A-5’s pull-up has a peak output current of 1.1A

and its pull-down has an output impedance of 1.85Ω.

The LTC4440A-5 features supply independent TTL/CMOS

compatible input thresholds with 350mV of hysteresis.

The input logic signal is internally level-shifted to the

bootstrapped supply, which may function at up to 95V

above ground.

The LTC4440A-5 is optimized for driving (5V) logic level

FETs and contains an undervoltage lockout circuit that

disables the external MOSFET when activated.

The LTC4440A-5 is available in the thermally enhanced

8-lead MSOP package.

PARAMETER

Max Operating TS

Absolute Max TS

MOSFET Gate Drive

VCC UV+

VCC UV–

LTC4440A-5

80V

100V

4V to 15V

3.2V

3.04V

LTC4440-5

60V

80V

4V to 15V

3.2V

3.04V

LTC4440

80V

100V

8V to 15V

6.3V

6.0V

Typical Application

Synchronous Phase-Modulated Full-Bridge Converter

VIN

36V TO 80V

VCC

4V TO 15V

LTC4440A-5

VCC BOOST

INP TG

GND TS

LTC4440A-5 Driving a 1000pF Capacitive Load

TG-TS

2V/DIV

LTC3722-1

LTC4440A-5

VCC BOOST

INP TG

GND TS

••

4440A5 TA01

INP

2V/DIV

50ns/DIV

VCC = BOOST-TS = 5V

For more information www.linear.com/LTC4440A-5

4440A5 TA02

4440a5f

1

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