UCC39422 - Unitrode

UCC39422 Multimode High Frequency PWM Controller

SYNC/SD 13 RT 14 1.8 V(MIN) 1.24 V VREF PWM OSC VPUMP 7 VIN 9 CHARGE PUMP VPUMP 8 CP 3 VOUT 2 RSEN RECT 4 ANTI− CROSS COND. VGD RSEL 19 CHRG 6 PWM CIRCUITRY CURRENT LIMIT LOW POWER MODE SLOPE COMPENSATION PFM MODE CONTROL GND 15 + X10 ERROR 1.24 V AMP + ISENSE 12 PGND 5 FB 17 COMP 18 PFM 16 + + 2 CELL ALKALINE/ + NiCd OR 1 LI−ION VOUT 50 .

Features

include pulse-by-pulse current limiting, and a low 5-µA quiescent current during shutdown. The UCC39422 incorporates programmable power-on reset circuitry and an uncommitted comparator for low voltage detection. The available packages are 20-pin TSSOP or 20-pin N for the UCC39422, and 16-pin TSSOP or 16-pin N for the UCC39421. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)Ĕ} Supply Voltage (VIN, VOUT,VPUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V CP . . . . . . . . . . .