UCC38C42DRG4
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Texas Instruments UCC38C42DRG4

Manufacturer No:
UCC38C42DRG4
Manufacturer:
Texas Instruments
Package:
Tape & Reel (TR)
Description:
IC OFFLINE CTRLR PWM UVLO 8SOIC
Delivery:
Payment:
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Product Introduction

Overview

The UCC38C42DRG4 is a high-performance, low-power current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCCx8C4x family, which offers enhanced replacements for the UCx84x and UCx84xA families with pin-to-pin compatibility. This BiCMOS device is designed to improve efficiency and reduce power consumption, making it suitable for a variety of power supply applications. The UCC38C42DRG4 operates within a temperature range of 0°C to 85°C and is available in 8-pin packages such as SOIC (D) and MSOP (DGK).

Key Specifications

Parameter Min Max Unit
Operating Frequency - - 1 MHz -
Start-up Voltage 13.5 14.5 15.5 V
Minimum Operating Voltage 8 9 10 V
Maximum Duty Cycle 94% 96% - -
Current Sense to Output Delay 35 ns - 70 ns -
Peak Output Current - - ±1 A -
Rise Time (TA = 25°C, CLOAD = 1 nF) 25 ns - 50 ns -
Fall Time (TA = 25°C, CLOAD = 1 nF) 20 ns - 40 ns -
Power Supply Rejection Ratio (PSRR) 70 dB - - -
Operating Temperature Range 0°C - 85°C -

Key Features

  • High-frequency operation up to 1 MHz, suitable for high-speed applications.
  • Enhanced BiCMOS technology offering lower power consumption and faster current sense and oscillator frequency.
  • Fast current-sense-to-output delay time of 35 ns for superior overload protection.
  • ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.
  • Pin-to-pin compatibility with the UCx84x and UCx84xA families.
  • Undervoltage lockout (UVLO) and current limiting protection circuitry.
  • Precision reference trimmed for accuracy at the error amplifier input.
  • Logic to ensure latched operation and a PWM comparator for current limit control.

Applications

  • AC-DC and DC-DC fixed-frequency current-mode power supplies.
  • Battery-powered systems, especially with lower startup voltage versions (e.g., UCCx8C40 and UCCx8C41).
  • High-speed power supply applications requiring precise control and high efficiency.
  • Industrial power supplies, telecom power systems, and other high-reliability power supply applications.

Q & A

  1. What is the maximum operating frequency of the UCC38C42DRG4?

    The maximum operating frequency is up to 1 MHz.

  2. What is the temperature range for the UCC38C42DRG4?

    The device operates within a temperature range of 0°C to 85°C.

  3. What is the start-up voltage for the UCC38C42DRG4?

    The start-up voltage is between 13.5 V and 15.5 V.

  4. What is the maximum duty cycle for the UCC38C42DRG4?

    The maximum duty cycle is up to 96%.

  5. What is the current sense to output delay time?

    The current sense to output delay time is 35 ns.

  6. What is the peak output current capability?

    The peak output current capability is ±1 A.

  7. What packages are available for the UCC38C42DRG4?

    The device is available in 8-pin packages such as SOIC (D) and MSOP (DGK).

  8. Does the UCC38C42DRG4 have undervoltage lockout protection?

    Yes, the device includes undervoltage lockout (UVLO) protection.

  9. What is the power supply rejection ratio (PSRR) of the UCC38C42DRG4?

    The PSRR is 70 dB.

  10. Is the UCC38C42DRG4 compatible with older PWM controller families?

    Yes, it is pin-to-pin compatible with the UCx84x and UCx84xA families.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive
Topology:Boost, Flyback, Forward Converter
Number of Outputs:1
Output Phases:1
Voltage - Supply (Vcc/Vdd):9V ~ 18V
Frequency - Switching:Up to 1MHz
Duty Cycle (Max):96%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:Frequency Control
Operating Temperature:0°C ~ 70°C (TJ)
Mounting Type:Surface Mount
Package / Case:8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:8-SOIC
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Similar Products

Part Number UCC38C42DRG4 UCC38C45DRG4 UCC38C41DRG4 UCC38C42DG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Product Status Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down
Output Configuration Positive Positive Positive Positive
Topology Boost, Flyback, Forward Converter Boost, Flyback, Forward Converter Boost, Flyback, Forward Converter Boost, Flyback, Forward Converter
Number of Outputs 1 1 1 1
Output Phases 1 1 1 1
Voltage - Supply (Vcc/Vdd) 9V ~ 18V 7.6V ~ 18V 6.6V ~ 18V 9V ~ 18V
Frequency - Switching Up to 1MHz Up to 1MHz Up to 1MHz Up to 1MHz
Duty Cycle (Max) 96% 48% 48% 96%
Synchronous Rectifier No No No No
Clock Sync No No No No
Serial Interfaces - - - -
Control Features Frequency Control Frequency Control Frequency Control Frequency Control
Operating Temperature 0°C ~ 70°C (TJ) 0°C ~ 70°C (TJ) 0°C ~ 70°C (TJ) 0°C ~ 70°C (TJ)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC 8-SOIC 8-SOIC 8-SOIC

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