1FEATURES
2• Operation Reduces Output Filter Size and Cost
by 50% Compared to DRV591
• ±3-A Maximum Output Current
• Low Supply Voltage Operation: 2.8 V to 5.5 V
• High Efficiency Generates Less Heat
• Overcurrent and Thermal Protection
• Fault Indicators for Overcurrent, Thermal and
Undervoltage Conditions
• Two Selectable Switching Frequencies
• Internal or External Clock Sync
• PWM Scheme Optimized for EMI
• 9×9 mm PowerPAD™ Quad Flatpack Package

APPLICATIONS
• Thermoelectric Cooler (TEC) Driver
• Laser Diode Biasing

DESCRIPTION
The DRV593 and DRV594 are high-efficiency,
high-current power amplifiers ideal for driving a wide
variety of thermoelectric cooler elements in systems
powered from 2.8 V to 5.5 V. The operation of the
device requires only one inductor and capacitor for
the output filter, saving significant printed-circuit
board area. Pulse-width modulation (PWM) operation
and low output stage on-resistance significantly
decrease power dissipation in the amplifier.
The DRV593 and DRV594 are internally protected against thermal and current overloads. Logic-level
fault indicators signal when the junction temperature
has reached approximately 128°C to allow for
system-level shutdown before the amplifier's internal
thermal shutdown circuitry activates. The fault
indicators also signal when an overcurrent event has occurred. If the overcurrent circuitry is tripped, the
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.