FAN3268_11 FAIRCHILD [Fairchild Semiconductor], FAN3268_11 Datasheet

FAN3268_11

Manufacturer Part Number

FAN3268_11

Description

2A Low-Voltage PMOS-NMOS Bridge Driver

Manufacturer

FAIRCHILD [Fairchild Semiconductor]

Datasheet

1.FAN3268_11.pdf (16 pages)

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FAN3268 • Rev. 1.0.1

FAN3268

2A Low-Voltage PMOS-NMOS Bridge Driver

Features



Applications



4.5V to 18V Operating Range

Drives High-Side PMOS and Low-Side NMOS in

Motor Control or Buck Step-down Applications

Inverting Channel B Biases High-Side PMOS

Device Off (with internal 100kΩ Resistor) when

TTL Input Thresholds

2.4A Sink / 1.6A Source at V

Internal Resistors Turn Driver Off If No Inputs

MillerDrive™ Technology

8-Lead SOIC Package

Rated from –40°C to +125°C Ambient

Motor Control with PMOS / NMOS Half-Bridge

Configuration

Buck Converters with High-Side PMOS Device;

100% Duty Cycle Operation Possible

Logic-Controlled Load Circuits with High-Side

PMOS Switch

is below UVLO Threshold

OUT=

Figure 1. Typical Motor Drive Application

Description

The FAN3268 dual 2A gate driver is optimized to drive a

high-side P-channel MOSFET and a low-side N-channel

MOSFET in motor control applications operating from a

voltage rail up to 18V. The driver has TTL input

thresholds and provides buffer and level translation

functions from logic inputs. Internal circuitry provides an

under-voltage lockout function that prevents the output

switching devices from operating if the V

voltage is below the operating level. Internal 100kΩ

resistors bias the non-inverting output low and the

inverting output to V

off during startup intervals when logic control signals

may not be present.

The

architecture for the final output stage. This bipolar-

MOSFET combination provides high current during the

Miller plateau stage of the MOSFET turn-on / turn-off

process to minimize switching loss, while providing rail-

to-rail voltage swing and reverse current capability.

The FAN3268 has two independent enable pins that

default to on if not connected. If the enable pin for non-

inverting channel A is pulled low, OUTA is forced low; if

the enable pin for inverting channel B is pulled low,

OUTB is forced high. If an input is left unconnected,

internal resistors bias the inputs such that the external

MOSFETs are off.

FAN3268

driver

to keep the external MOSFETs

incorporates

January 2011

www.fairchildsemi.com

MillerDrive™

supply

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