ActualSize

9mmSquare

1

µF

AVDD

AGND (Connect to PowerPAD)

ROSC

COSC

AREF

IN+

IN−

IN−

H/C

PGND

PGND

PGND

PGND

PGND

PGND

PWM

120 k

Ω

220 pF

1

µF

Shutdown Control

1 k

Ω

1 k

Ω

DC Control

Voltage

10

µF

VDD

10

µH

1

µF

FAULT1

FAULT0

To TEC or Laser

Diode Anode

To TEC or Laser

Diode Cathode

1

µF

SHUTDOWN

DRV593

DRV594

10

µF

DRV593

DRV594

www.ti.com

SLOS401C – OCTOBER 2002 – REVISED JULY 2010

±3-A HIGH-EFFICIENCY PWM POWER DRIVER

Check for Samples: DRV593, DRV594

1

FEATURES

DESCRIPTION

2

•

Operation Reduces Output Filter Size and Cost

by 50% Compared to DRV591

The

DRV593

and

DRV594

are

high-efficiency,

high-current power amplifiers ideal for driving a wide

•

±3-A Maximum Output Current

variety of thermoelectric cooler elements in systems

•

Low Supply Voltage Operation: 2.8 V to 5.5 V

powered from 2.8 V to 5.5 V. The operation of the

•

High Efficiency Generates Less Heat

device requires only one inductor and capacitor for

•

Overcurrent and Thermal Protection

the output filter, saving significant printed-circuit

board area. Pulse-width modulation (PWM) operation

•

Fault Indicators for Overcurrent, Thermal and

and low output stage on-resistance significantly

Undervoltage Conditions

decrease power dissipation in the amplifier.

•

Two Selectable Switching Frequencies

The DRV593 and DRV594 are internally protected

•

Internal or External Clock Sync

against thermal and current overloads. Logic-level

•

PWM Scheme Optimized for EMI

fault indicators signal when the junction temperature

has reached approximately 128°C to allow for

•

9×9 mm PowerPAD™ Quad Flatpack Package

system-level shutdown before the amplifier's internal

thermal

shutdown

circuitry

activates.

The

fault

APPLICATIONS

indicators also signal when an overcurrent event has

•

Thermoelectric Cooler (TEC) Driver

occurred. If the overcurrent circuitry is tripped, the

•

Laser Diode Biasing

devices

automatically

reset

(see

application

information section for more details).

The PWM switching frequency may be set to 500 kHz

or 100 kHz depending on system requirements. To

eliminate external components, the gain is fixed at

2.3 V/V for the DRV593. For the DRV594, the gain is

fixed at 14.5 V/V.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.