UCC28C44

Product Summary

The UCC28C44 is a high-performance current mode PWM controller. It is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UC384xA family and UC384x family of PWM controllers. In addition, lower startup voltage versions of 7 V are offered as the UCC28C43D. Providing necessary features to control fixed frequency, peak current-mode power supplies, this device offers the following performance advantages. The UCC28C44 offers high-frequency operation up to 1 MHz with low start-up and operating currents, thus minimizing start-up loss and low operating power consumption for improved efficiency. The applications of the UCC28C44 include Switch-Mode Power Supplies, dc-to-dc Converters, Board Mount Power Modules.

Parametrics

UCC28C44 absolute maximum ratings: (1)Supply voltage (VDD): 20V; (2)Supply voltage (MAX ICC): 30mA; (3)Output current, IOUT peak: ±1A; (4)Output energy, capacitive load: 5μJ; (5)Voltage rating (COMP, CS, FB): -0.3V to 6.3V; (6)Voltage rating (OUT): -0.3V to 20V; (7)Voltage rating (RT/CT): -0.3V to 6.3V; (8)Voltage rating (VREF): 7V; (9)Error amplifier output sink current: 10mA; (10)Total Power Dissipation at TA = 25℃, D package (θjc = 22℃/W, θja = 40 - 70℃/W): 650mW; DGK package (θjc = 41℃/W, θja = 238 - 269℃/W: 350mW; P package (θjc = 50℃/W, θja = 110℃/W: 850mW; (11)Operating junction temperature range, TJ: -55℃ to 150℃; (12)Storage temperature range, Tstg: -65℃ to 150℃; (13)Lead Temperature (Soldering, 10 seconds): 300℃.

Features

UCC28C44 features: (1)Enhanced Replacement for UC3842A Family With Pin-to-Pin Compatibility; (2)1-MHz Operation; (3)50-μA Standby Current, 100-μA Maximum; (4)Low Operating Current of 2.3 mA at 52 kHz; (5)Fast 35-ns Cycle-by-Cycle Overcurrent Limiting; (6)±1-A Peak Output Current; (7)Rail-to-Rail Output Swings with 25-ns Rise and 20-ns Fall Times; (8)±1% Initial Trimmed 2.5-V Error Amplifier Reference; (9)Trimmed Oscillator Discharge Current; (10)New Under Voltage Lockout Versions; (11)MSOP-8 Package Minimizes Board Space.

Diagrams