H+

A1

2

7

V

CC

A2

1

8

AL

LD

3

6

H–

GND

4

5

Logic

Regulator

+

–

+

–

Lock Detect/

Auto Restart

+

–

Hall

Amp

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

TMP821

SLDS152A – JANUARY 2008 – REVISED MAY 2015

TMP821 Two-Phase Half-Wave Motor Predriver

1 Features

3 Description

The TMP821 device is a two-phase half-wave motor

1

•

Built-In Lock Detection and Rotational Speed

predriver that is suited for fan motors, which has

Sensing Mechanisms

winding in push-pull configuration. It uses differential

•

Compact 8-Pin Package Reduces Number of

hall effect sensors for commutation signals for two of

External Components Required

the switches in power circuit. The device has a very

small pin count, making it very simple to use.

•

Automatic Restart When Motor Lock Is Undone

•

Hall Amplifier Inputs Have Hysteresis

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

2 Applications

TMP821

SOIC (8)

4.90 mm × 3.91 mm

Small Server Fans

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Block Diagram

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.