UCC29421, UCC39421 Datasheet - Unitrode

UCC29421 - 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 CO

ą UCC29421, UCC29422, UCC39421, UCC39422 MULTIMODE HIGHĆFREQUENCY PWM CONTROLLER SLUS246C OCTOBER 1999 REVISED FEBRUARY 2005 D Operation Down to an Input Voltage of 1.8 V simplified schematic block diagram and application circuit D High Efficiency Boost, SEPIC or Flyback (Buck-Boost) Topologies D Drives External FETs for High-Current Applications D Up to 2-MHz Oscillator D Synchronizable Fixed Frequency Operation D High-Efficiency Low-Power Mode D High-Efficiency at Very

UCC29421 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 o

UCC39421-Unitrode.pdf