TPS5633

TPS5615, TPS5618, TPS5625, TPS5633 SYNCHRONOUS-BUCK HYSTERETIC REGULATOR CONTROLLER SLVS177B − SEPTEMBER 1998 − REVISED JULY 2000 D ±1% Reference Over Full Operating Temperature Range D Synchronous Rectifier Driver for >90% Efficiency D Fixed Output Voltage Options of 1.5 V, 1.8 V, 2.5 V, and 3.3 V D User-Selectable Hysteretic-Type Control D Low Supply Current . . . 3 mA Typ D 11.4-V to 13-V Input Voltage Range, VCC D Power Good Output D Programmable Soft-Start D Overvoltage/Overcurrent Protection D Active Deadtime Control description PWP PACKAGE (TOP VIEW) IOUT AGND2 OCP VHYST VREFB VSENSE ANAGND SLOWST BIAS LODRV LOHIB DRVGND LOWDR DRV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NC − No internal connection 28 27 26 25 24 23 22 21 20 19 18 17 16 15 PWRGD NC NC NC NC NC INHIBIT IOUTLO LOSENSE HISENSE BOOTLO HIGHDR BOOT VCC The TPS5615 family of synchronous-buck regulator controllers provides an accurate supply voltage to DSPs. The output voltage is internally set by a resistive divider with an accuracy of 1% over the full operating temperature range. A hysteretic controller with user-selectable hysteresis is used to dramatically reduce overshoot and undershoot caused by load transients. Propagation delay from the comparator inputs to the output drivers is less than 250 ns. Overcurrent shutdown and crossover protection for the output drivers combine to eliminate destructive faults in the output FETs. PWRGD monitors the output voltage and pulls the open-collector output low when ...