Product details


Topology Flyback, Boost, Control mode Current Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 18 UVLO thresholds on/off (V) 8.4/7.6 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Programmable Max Duty Cycle Operating temperature range (C) -40 to 105 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 1 open-in-new Find other PWM controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other PWM controllers


  • Enhanced Replacement for UCx84x and UCx84xA Family With Pin-to-Pin Compatibility
  • 1-MHz Operation
  • 50-µA Standby Current, 100-µA Maximum
  • Low Operating Current of 2.3 mA at 52 kHz
  • Fast 35-ns Cycle-by-Cycle Over-Current 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
  • VSSOP-8 Package Minimizes Board Space
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UCCx8C4x family are high-performance, current-mode PWM controllers. The UCCx8C4x is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UCx84xA family and UCx84x family of PWM controllers. The BiCMOS technology offers lower power consumption to improve efficiency as well as faster current sense and oscillator frequency. In addition, lower startup voltage versions of 7 V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The UCC28C4x series is specified for operation from –40°C to 105°C, and the UCC38C4x series is specified for operation from 0°C to 70°C.

Providing necessary features to control fixed frequency, peak current-mode power supplies, this family offers the following performance advantages. The device offers high-frequency operation up to 1 MHz, suitable for high speed applications. The trimmed discharge current enables more precise programming of the maximum duty cycle and dead-time limit when compared to the UCx84x family. Reduced start-up and operating currents minimizes start-up loss and low operating power consumption for improved efficiency. The device also features a fast current-sense-to-output delay time of 35 ns for superior overload protection at the power switch, and a ±1-A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC38C4x family is offered in 8-pin VSSOP (DGK), 8-pin SOIC (D), and 8-pin PDIP (P) packages.

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Technical documentation

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Type Title Date
* Data sheet UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet (Rev. G) Jan. 10, 2017
Application note Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) Jun. 11, 2021
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note UCC38C44 12-V Isolated Bias Supply (Rev. A) Oct. 09, 2008
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design Feb. 04, 2003
Application note UCC38C42 25-W Forward Converter Sep. 06, 2002
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers Feb. 07, 2002
Application note DN-30 Programmable Electronic Circuit Breaker Sep. 05, 1999
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 Sep. 05, 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies Sep. 05, 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SLUM033.ZIP (101 KB) - PSpice Model
SLUM176.TSC (204 KB) - TINA-TI Reference Design
SLUM177.TSC (182 KB) - TINA-TI Reference Design
SLUM178.ZIP (10 KB) - TINA-TI Spice Model
SLUM179.ZIP (10 KB) - TINA-TI Spice Model
SLUM521.ZIP (4 KB) - PSpice Model

CAD/CAE symbols

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PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

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