DUAL H-BRIDGE MOTOR DRIVER

DESCRIPTION

The UMD9148 provides a dual H-bridge motor driver for home

appliances and other mechatronic applications. The device can

be used to drive one or two DC motors, a bipolar stepper motor,

or other loads. A simple PWM interface allows easy inter facing to

controller circuits.

The output block of each H-bridge driver consists of N-channel

and P-channel power MOSFETs configured as full H-bridges to

drive the motor windings. Each H-bridge includes circuitry to

regulate the winding current using a fixed off-time chopping

scheme. The UMD9148 is capable of driving up to 2A of current

from each output or 4A of current in parallel mode(with proper

heat sinking, at 12V and TA=25°C).

A low-power sleep mode is provided, which shuts down

internal circuitry to achieve very-low quiescent current draw. This

sleep mode can be set using a dedicated nSLEEP pin.

Internal protection functions are provided for UVLO, OCP,

short-circuit protection, and over temperature. Fault conditions

are indicated by an FAULT pin.

FEATURES

* Dual H-Bridge Motor Driver Single/Dual Brushed DC Stepper

* PWM Control Interface

* Optional Current Regulation With 20-μs Fixed Off-Time

* High Output Current per H-Bridge

2A Maximum Driver Current at 12V and TA=25°C

Parallel Mode Available Capable of 4-A Maximum Driver

Current at 12V and TA=25°C

* 4 to 18V Operating Supply Voltage Range

* Low-Current3-µA sleep Mode

* Thermally-Enhanced Surface Mount Package

* Protection Features

VM Under voltage Lockout (UVLO)

Over current Protection (OCP)

Thermal Shutdown (TSD)

Fault Condition Indication Pin (nFAULT)