LTC1157 Linear Technology, LTC1157 Datasheet

LTC1157

Manufacturer Part Number

LTC1157

Description

3.3V Dual Micropower High-Side/Low-Side MOSFET Driver

Manufacturer

Linear Technology

Datasheet

1.LTC1157.pdf (8 pages)

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Download datasheet (222Kb)

FEATURE

TYPICAL

PPLICATI

Notebook Computer Power Management

Palmtop Computer Power Management

P-Channel Switch Replacement

Battery Charging and Management

Mixed 5V and 3.3V Supply Switching

Stepper Motor and DC Motor Control

Cellular Telephones and Beepers

Allows Lowest Drop 3.3V Supply Switching

Operates on 3.3V or 5V Nominal Supplies

3 Microamps Standby Current

80 Microamps ON Current

Drives Low Cost N-Channel Power MOSFETs

No External Charge Pump Components

Controlled Switching ON and OFF Times

Compatible with 3.3V and 5V Logic Families

Available in 8-Pin SOIC

3.3V

LOGIC

3.3V

Ultra Low Voltage Drop 3.3V Dual High-Side Switch

PPLICATI

10 F

IN1

IN2

LTC1157

GND

(8.7V)

IRLR024

LTC1157 • TA01

IRLR024

High-Side/Low-Side MOSFET Driver

LOAD

3.3V

The LTC1157 dual 3.3V micropower MOSFET gate driver

makes it possible to switch either supply or ground

reference loads through a low R

(N-channel switches are required at 3.3V because P-

channel MOSFETs do not have guaranteed R

the gate drive voltage 5.4V above the positive rail (8.7V

above ground), fully enhancing a logic level N-channel

switch for 3.3V high-side applications and a standard N-

channel switch for 3.3V low-side applications. The gate

drive voltage at 5V is typically 8.8V above supply (13.8V

above ground), so standard N-channel MOSFET switches

can be used for both high-side and low-side applications.

Micropower operation, with 3 A standby current and

80 A operating current, makes the LTC1157 well suited

for battery-powered applications.

The LTC1157 is available in both 8-pin DIP and SOIC.

ESCRIPTIO

3.3V). The LTC1157 internal charge pump boosts

3.3V Dual Micropower

2.0

Gate Voltage Above Supply

2.5

3.0

SUPPLY VOLTAGE (V)

3.5

DS(ON)

4.0

4.5

N-channel switch

5.0

LTC1157

LTC1157 • TA02

5.5

DS(ON)

6.0

with

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