FEATURES
· Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
– Extended Temperature Performance of
–55°C to 125°C
· Enhanced Diminishing Manufacturing Sources
(DMS) Support
· Enhanced Product-Change Notification
· Qualification Pedigree (1)
· Enhanced Replacements for UC2842A Family
With Pin-to-Pin Compatibility
· 1 MHz Operation
· 50 mA Standby Current, 100 mA Maximum
· Low Operating Current of 2.3 mA at 52 kHz
· Fast 35 ns Cycle-by-Cycle Overcurrent
Limiting
· ±1 A Peak Output Current
· Rail-to-Rail Output Swings With 25 ns Rise
and 20 ns Fall Times
· ±1% Initial Trimmed 2.5 V Error Amplifier
Reference
· Trimmed Oscillator Discharge Current
· New Undervoltage Lockout Versions
· MSOP-8 Package Minimizes Board Space

APPLICATIONS
· Switch Mode Power Supplies
· DC-to-DC Converters
· Board Mount Power Modules

DESCRIPTION
The UCC28C4x family are high performance current mode PWM controllers. They are enhanced BiCMOS
versions with pin-for-pin compatibility to the industry standard UC284xA family and UC284x family of PWM
controllers. In addition, lower startup voltage versions of 7 V are offered as UCC28C40 and UCC28C41.
Providing necessary features to control fixed frequency, peak current mode power supplies, this family offers
several performance advantages. These devices offer 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 devices also feature a fast current sense to output delay time of 35 ns, and a ±1 A peak output
current capability with improved rise and fall times for driving large external MOSFETs directly.
The UCC28C4x family is offered in 8-pin package SOIC (D).