LTC4440IMS8E Просмотр технического описания (PDF) - Linear Technology

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LTC4440IMS8E

High Speed, High Voltage High Side Gate Driver

Linear Technology 

FEATURES

■ Wide Operating VIN Range: Up to 80V

■ Rugged Architecture Tolerant of 100V VIN

Transients

■ Powerful 1.5Ω Driver Pull-Down

■ Powerful 2.4A Peak Current Driver Pull-Up

■ 7ns Fall Time Driving 1000pF Load

■ 10ns Rise Time Driving 1000pF Load

■ Drives Standard Threshold MOSFETs

■ TTL/CMOS Compatible Inputs with Hysteresis

■ Input Thresholds are Independent of Supply

■ Undervoltage Lockout

■ Low Profile (1mm) SOT-23 (ThinSOT)TM and

Thermally Enhanced 8-Pin MSOP Packages

U

APPLICATIO S

■ Telecommunications Power Systems

■ Distributed Power Architectures

■ Server Power Supplies

■ High Density Power Modules

LTC4440

High Speed, High Voltage

High Side Gate Driver

DESCRIPTIO

The LTC®4440 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 LTC4440 can also

withstand and continue to function during 100V VIN tran-

sients. The powerful driver capability reduces switching

losses in MOSFETs with high gate capacitances. The

LTC4440’s pull-up has a peak output current of 2.4A and

its pull-down has an output impedance of 1.5Ω.

The LTC4440 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 115V

above ground.

The LTC4440 contains both high side and low side under-

voltage lockout circuits that disable the external MOSFET

when activated.

The LTC4440 is available in the low profile (1mm) SOT-23

and thermally enhanced 8-lead MSOP packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

Protected by U.S. Patents, including 6677210.

TYPICAL APPLICATIO

Synchronous Phase-Modulated Full-Bridge Converter

VIN

36V TO 72V

100V PEAK TRANSIENT

(ABS MAX)

VCC

8V TO 15V

LTC4440

VCC BOOST

INP TG

GND TS

VCC

LTC3722-1

LTC4440

VCC BOOST

INP TG

GND TS

INPUT

(INP)

2V/DIV

••

OUTPUT

(TG – TS)

5V/DIV

4440 TA01

LTC4440 Driving a 1000pF

Capacitive Load

10ns/DIV

4440 F02

4440f

1

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