DMOS Microstepping Driver with Translator

A3979

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

The A3979 is supplied in a low-profile (maximum height

≤ 1.20 mm), 28-pin TSSOP with exposed thermal pad. The

package is available in a lead (Pb) free version, with 100%

matte tin leadframe plating.

Selection Guide

Part Number

Pb-free*

Packing

A3979SLP-T

Yes

50 pieces per tube

A3979SLPTR-T

Yes

4000 pieces per reel

*Pb-based variants are being phased out of the product line. The variants cited in

this footnote are in production but have been determined to be LAST TIME BUY. This

classification indicates that sale of this device is currently restricted to existing cus-

tomer applications. The variants should not be purchased for new design applications

because obsolescence in the near future is probable. Samples are no longer available.

Status change: October 31, 2006. Deadline for receipt of LAST TIME BUY orders: April

27, 2007.These variants include: A3979SLP and A3979SLPTR.

Description (continued)

Absolute Maximum Ratings

Load Supply Voltage

35

V

Output Current

Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any set of

conditions, do not exceed the specified current rating or a

junction temperature of 150°C.

±2.5

A

Logic Supply Voltage

7.0

V

Logic Input Voltage Range

V

V

Sense Voltage

0.5

V

Reference Voltage

V

Package Power Dissipation

See page 5

Operating Ambient Temperature

Range S

–20 to 85

°C

Junction Temperature

150

°C

Storage Temperature

–55 to 150

°C