DATA SHEET

c

MOS INTEGRATED CIRCUIT

µPD16818

MONOLITHIC DUAL H BRIDGE DRIVER CIRCUIT

DESCRIPTION

The

µPD16818 is a monolithic dual H bridge driver IC which uses N-channel power MOS FETs in its output stage. By

employing the power MOS FETs for the output stage, this driver circuit has a substantially improved saturation voltage and

power consumption as compared with conventional driver circuits that use bipolar transistors.

In addition, the drive current can be adjusted by an external resistor in power-saving mode.

The

µPD16818 is therefore ideal as the driver circuit of a 2-phase excitation, bipolar-driven stepping motor for the head

actuator of an FDD.

FEATURES

•

Compatible with 3V-/5V- supply voltage

•

Pin compatible with

µPD16803

•

Low ON resistance (sum of ON resistors of top and bottom MOS FETs)

RON1= 1.2

Ω (VM = 3.0 V)

RON2 = 1.0

Ω (VM = 5.0 V)

•

Low current consumption: IDD = 0.4 mA TYP. (VDD = 2.7 V to 3.6 V)

•

Stop mode function that turns OFF all output MOS FETs

•

Drive current can be set in power-saving mode (set by external resistor)

•

Compact surface mount package

ORDERING INFORMATION

Part Number

Package

µPD16818GS

20-pin plastic SOP (7.62 mm (300))

ABSOLUTE MAXIMUM RATINGS (TA = 25

°C)

Parameter

Symbol

Condition

Rating

Unit

Supply voltage

Motor block

VM

–0.5 to +7.0

V

Control block

VDD

–0.5 to +7.0

Power

µPD16818GS

PD1

1.0Note 1

W

consumption

PD2

1.25Note 2

Instantaneous H bridge drive current

ID (pulse)

PW

≤ 5 ms, Duty ≤ 40 %

±1.0Note 2

A

Input voltage

VIN

–0.5 to VDD + 0.5

V

Operating temperature range

TA

0 to 60

°C

Operation junction temperature

TJ (MAX)

150

°C

Storage temperature range

Tstg

–55 to +150

°C

Notes 1. IC only

2. When mounted on a glass epoxy printed circuit board (100 mm

× 100 mm × 1 mm)

Document No. S11365EJ2V1DS00 (2nd edition)

Date Published September 2004 N CP(K)

Printed in Japan

The information in this document is subject to change without notice. Before using this document, please

confirm that this is the latest version.

Not all products and/or types are available in every country. Please check with an NEC Electronics

sales representative for availability and additional information.