LO

DRIVER

UVLO

HO

DRIVER

HB

UVLO

LEVEL

SHIFT

HB

HS

IN

EN

LEADING

EDGE

DELAY

LEADING

EDGE

DELAY

RDT

LM5105

www.ti.com

SNVS349C – FEBRUARY 2005 – REVISED MARCH 2013

LM5105 100V Half Bridge Gate Driver with Programmable Dead-Time

Check for Samples: LM5105

1

FEATURES

DESCRIPTION

The LM5105 is a high voltage gate driver designed to

•

Drives Both a High Side and Low Side N-

drive both the high side and low side N –Channel

Channel MOSFET

MOSFETs in a synchronous buck or half bridge

•

1.8A Peak Gate Drive Current

configuration. The floating high-side driver is capable

•

Bootstrap Supply Voltage Range up to 118V

of working with rail voltages up to 100V. The single

control input is compatible with TTL signal levels and

DC

a single external resistor programs the switching

•

Integrated Bootstrap Diode

transition dead-time through tightly matched turn-on

•

Single TTL Compatible Input

delay circuits. A high voltage diode is provided to

•

Programmable Turn-On Delays (Dead-Time)

charge the high side gate drive bootstrap capacitor.

The robust level shift technology operates at high

•

Enable Input Pin

speed while consuming low power and provides clean

•

Fast Turn-Off Propagation Delays (26ns

output transitions. Under-voltage lockout disables the

Typical)

gate

driver

when

either

the

low

side

or

the

•

Drives 1000pF with 15ns Rise and Fall Time

bootstrapped high side supply voltage is below the

operating threshold. The LM5105 is offered in the

•

Supply Rail Under-Voltage Lockout

thermally enhanced WSON plastic package.

•

Low Power Consumption

TYPICAL APPLICATIONS

PACKAGE

•

Solid State motor drives

•

WSON-10 (4 mm x 4 mm)

•

Half and Full Bridge power converters

SIMPLIFIED BLOCK DIAGRAM

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.