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UCC29421 Datasheet Multimode High Frequency Pwm Controller

Manufacturer: Unitrode

Overview: ą UCC29421, UCC29422, UCC39421, UCC39422 MULTIMODE HIGHĆFREQUENCY PWM CONTROLLER SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005 D Operation Down to an Input Voltage of 1.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

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 PENSATION PFM MODE CONTROL GND 15 + X10 ERROR 1.24 V AMP + ISENSE 12 PGND 5 FB 17 P 18 PFM 16 + + 2 CELL ALKALINE/ + NiCd OR 1 LI−ION VOUT 50 mV TYP The UCC39421 family of synchronous RESET PWM controllers is optimized to operate 1 from dual alkaline/NiCd cells or a single Lithium-Ion (Li-Ion) cell, and convert to LOWBAT adjustable output voltages from 2.5 V to 10 8 V.

For applications where the input voltage does not exceed the output, a standard boost configuration is used.

Key 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).

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UCC29421 Distributor