A3977SEDT Allegro Micro Systems, Inc., A3977SEDT Datasheet

A3977SEDT

Manufacturer Part Number

A3977SEDT

Description

PLCC-44

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3977KLPT.pdf (18 pages)

Specifications of A3977SEDT

Date_code

11+

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Current page: 1 of 18
Download datasheet (417Kb)

Load Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range, V

Sense Voltage, V

Reference Voltage, V

Package Power Dissipation,

Operating Temperature Range, T

Junction Temperature, T

Storage Temperature Range,

* 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.

SUPPLY

LOGIC

ABSOLUTE MAXIMUM RATINGS

GND

PFD

REF

(A3977Kx) ............ -40°C to +125°C

(A3977Sx) .............. -20°C to +85°C

................................. See page 3

......................... -55°C to +150°C

>30 ns) ..... -0.3 V to V

<30 ns) ........... -1 V to V

MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

at T

TIMER

PWM

÷8

A3977xED

(PLCC)

OUT

SENSE

= +25°C

.................. ±2.5 A

REF

................. 0.5 V

................ V

BB1

BB2

......... +150°C

............. 35 V

........... 7.0 V

REG

+ 0.3 V

+ 1 V

Dwg. PP-075-1

GND

STEP

REG

with built-in translator. They are designed to operate bipolar stepper motors in

full-, half-, quarter-, and eighth-step modes, with output drive capability of 35

V and ±2.5 A. The A3977 includes a fixed off-time current regulator that has

the ability to operate in slow-, fast-, or mixed-decay modes. This current-

decay control scheme results in reduced audible motor noise, increased step

accuracy, and reduced power dissipation.

simply inputting one pulse on the STEP input the motor will take one step

(full, half, quarter, or eighth depending on two logic inputs). There are no

phase-sequence tables, high-frequency control lines, or complex interfaces to

program. The A3977 interface is an ideal fit for applications where a complex

µP is unavailable or over-burdened.

power dissipation during PWM operation.

under-voltage lockout (UVLO) and crossover-current protection. Special

power-up sequencing is not required.

plastic PLCC with copper batwing tabs (suffix ED), and a thin (<1.2 mm), 28-

pin TSSOP with an exposed thermal pad (suffix LP). The SLP package is

available in a lead-free version (100% matte tin leadframe).

FEATURES

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 customer

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 fo LAST TIME BUY orders: April 27, 2007.

These variants include:

A3977SEDTR, A3977SLP, and A3977SLPTR.

3977

A3977KED-T

A3977KEDTR-T

A3977KLP-T

A3977KLPTR-T

A3977SED-T

A3977SEDTR-T

A3977SLP-T

A3977SLPTR-T

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

Part Number

The A3977xED and A3977xLP are complete microstepping motor drivers

The translator is the key to the easy implementation of the A3977. By

Internal synchronous-rectification control circuitry is provided to improve

Internal circuit protection includes thermal shutdown with hysteresis,

The A3977 is supplied in a choice of two power packages, a 44-pin

±2.5 A, 35 V Output Rating

Low r

Automatic Current Decay Mode Detection/Selection

3.0 V to 5.5 V Logic Supply Voltage Range

Mixed, Fast, and Slow Current Decay Modes

Home Output

Synchronous Rectification for Low Power Dissipation

Internal UVLO and Thermal Shutdown Circuitry

Crossover-Current Protection

DS(on)

Pb-free*

Yes

Outputs, 0.45 Ω Source, 0.36 Ω Sink Typical

28-pin TSSOP

28-pin TSSOP 4000 per reel

28-pin TSSOP

28-pin TSSOP 4000 per reel

A3977KED, A3977KEDTR, A3977KLP, A3977KLPTR, A3977SED,

44-pin PLCC

Package

450 per reel

27 per tube

50 per tube

27 per tube

50 per tube

Packing

Ambient Temperature,

–40 to 125

–20 to 85

(°C)

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