DRV590

DRV590 SLOS365A – AUGUST 2001 – REVISED AUGUST 2002 1.2-A HIGH-EFFICIENCY PWM POWER DRIVER FEATURES D 1.22-A DC (82% Duty Cycle) Output Current (TJ ≤ 89°C) D 1-A DC (100% Duty Cycle) Output Current (TJ ≤ 89°C) D Low Supply Voltage Operation from 2.7 V to 5.5 V D High Efficiency Generates Less Heat D Over-Temperature Protection D Short-Circuit Protection D PowerPADt SOIC and 4 × 4 mm MicroStar Junior Packages APPLICATIONS D Thermoelectric Cooler (TEC) Driver D Laser Diode Biasing DESCRIPTION The DRV590 is a high-efficiency power amplifier ideal for driving a wide variety of thermoelectric cooler elements in systems powered from 2.7 V to 5.5 V. PWM operation and low output stage on-resistance significantly decrease power dissipation in the amplifier. The DRV590 is internally protected against over temperature conditions and current overloads due to short circuits. The over temperature protection activates at a junction temperature of 190°C and will deactivate once the temperature is less than 130°C. If the overcurrent circuitry is tripped, the amplifier will automatically reset after 3–5 ms. The gain of the DRV590 is controlled by two input terminals, GAIN1 and GAIN0. The amplifier may be configured for a gain of 6, 12, 18, and 23.5 dB. J1 R3 120 kΩ J8 VDD R4 120 kΩ J2 J5 J4 IN– (VCOM) IN+ R1 1 kΩ R2 1 kΩ R5 120 kΩ J3 C3 1 µF NC IN+ IN– SHUTDOWN GAIN0 GAIN1 PVDD OUT+ NC PGND NC AREF AGND COSC ROSC VDD PVDD OUT– NC PGND L1 10 µH C5 10 µF L2 10 µH C4 1 µF C9 22...