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Texas Instruments UCC28C45DRG4
- Part No.:
- UCC28C45DRG4
- Manufacturer:
- Texas Instruments
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Description:
- IC REG CTRLR MULT TOPOLOGY 8SOIC
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
UCC28C45DRG4 - TI Current-Mode PWM Controller
UCC28C45DRG4 is an active, 8-pin SOIC (D) ordering option for Texas Instruments' UCC28C45 low-power, peak current-mode PWM controller. TI lists it with the same package, operating range, device marking, and electrical family as UCC28C45DR. It combines an adjustable oscillator, cycle-by-cycle current limiting, undervoltage lockout, and a MOSFET gate-drive output for fixed-frequency power-conversion designs.
Part-specific information is based on TI's orderable-part information and UCCx8C4x datasheet. Check the latest revision before design approval.
Overview
The UCC28C45DRG4 controls an external power switch using peak current-mode regulation. Its FB and COMP pins support the voltage-feedback loop, while the CS input terminates each drive pulse when the sensed current reaches the control threshold. The RT/CT network sets the oscillator frequency.
This is the UCC28C45 variant with typical 8.4 V turn-on / 7.6 V turn-off UVLO. Its output stage runs at half the oscillator frequency and has a maximum duty cycle below 50%. The DR orderable code identifies the 8-pin SOIC (D) tape-and-reel version; it should not be confused with the VSSOP (DGK) package option.
Key Advantages
Typical 50 µA start-up current helps reduce bias-power loss before the controller starts.
Cycle-by-cycle current sensing provides a typical 35 ns CS-to-output delay for prompt response to an overcurrent event.
The OUT pin can source and sink up to 1 A peak, subject to gate-charge, frequency, and thermal design checks.
The family is pin-compatible with the UCx84x and UCx84xA controller families, while electrical differences still require review.
Feature Summary
Current-sense input and error-amplifier feedback support fixed-frequency switch-mode power supplies.
An external resistor and capacitor at RT/CT establish the oscillator frequency; the UCC28C45 OUT frequency is half of fOSC.
The internal toggle stage limits the maximum output duty cycle to below 50%.
Includes undervoltage lockout, cycle-by-cycle current limiting, and a 5 V reference output.
Package & Footprint
UCC28C45DRG4 is supplied in TI's 8-pin SOIC (D) surface-mount package. TI lists the nominal package body as 3.91 mm × 4.90 mm. The orderable part is supplied on a large tape-and-reel carrier of 2,500 pieces.
- Use TI's D-package drawing for pad geometry and pin-1 orientation.
- Place the VDD bypass capacitor close to the IC.
- Keep RT/CT and current-sense traces away from high-noise switching paths.
Use the manufacturer's current mechanical drawing for final PCB footprint and assembly requirements.
Pin Functions
The following mapping is for the 8-pin SOIC (D), top view shown in the TI datasheet.
Confirm pin-1 orientation and the complete electrical pin descriptions in TI's official pin-configuration diagram before PCB layout or replacement.
Key Specifications
| Orderable Part Number | UCC28C45DRG4 |
|---|---|
| Manufacturer | Texas Instruments (TI) |
| Function | Peak current-mode PWM controller |
| Package | 8-pin SOIC (D), surface mount |
| Operating Temperature Range | −40 °C to +125 °C |
| UVLO Turn-On / Turn-Off | 8.4 V / 7.6 V typical |
| Maximum Duty Cycle | Below 50%; 48% typical under TI's stated test conditions |
| Oscillator Frequency | Programmable; up to 1 MHz maximum for the family |
| OUT Frequency | One-half of the oscillator frequency for UCC28C45 |
| VDD Recommended Maximum | 18 V |
| Reference Output | 5 V typical |
| Start-Up Current | 50 µA typical; 100 µA maximum |
| Operating Supply Current | 2.3 mA typical under TI's stated test conditions |
| Peak OUT Drive Current | Up to ±1 A |
| CS-to-OUT Delay | 35 ns typical; 70 ns maximum |
Typical and maximum figures have different test conditions and should not be treated as guaranteed system-level performance. See the TI electrical-characteristics table.
Replacement Considerations
TI lists UCC28C45DR as an identical ordering option for UCC28C45DRG4 and identifies the UCC28C55 family as a newer replacement for UCC28C45. The following exact orderable parts are available in our catalog; suitability still depends on package, temperature range, qualification, and circuit-level requirements.
- UCC28C45DR — TI lists this orderable code as identical to UCC28C45DRG4. It uses the same 8-pin SOIC (D) package, industrial temperature range, and 28C45 device marking. Confirm the purchasable order code and reel labeling with the supplier.
- UCC28C55DR — closest same-package upgrade candidate: 8-pin SOIC (D), 8.4 V / 7.6 V UVLO class and 50% duty-cycle class, with a higher 30 V VDD absolute maximum rating. Recheck operating limits and behavior in the actual design.
- UCC38C55DR — same 8-pin SOIC package and control family, but specified for 0°C to 85°C rather than the UCC28C55 industrial temperature range. Consider only if the application's temperature and qualification requirements allow it.
- UCC28C55QDRQ1 — automotive-grade SOIC (D) option in the newer family. Check automotive qualification, electrical limits, and procurement requirements; the Q1 designation does not by itself establish interchangeability with this industrial order code.
- Package: match SOIC-8 footprint and pin orientation.
- Control behavior: check the 50% duty-cycle limit and OUT-to-oscillator frequency relationship.
- Bias and drive: review start-up, UVLO, VDD range, and gate-drive capability.
- Validation: recheck startup, current limit, loop stability, and thermal behavior in the actual circuit.
Pin compatibility alone does not establish full electrical interchangeability.
Manufacturer Information
Texas Instruments publishes the UCC28C45 product page, orderable-part information, datasheet, package data, and design resources. For engineering and sourcing decisions, use the exact UCC28C45DRG4 ordering code rather than the base family name alone.
- Manufacturer source: TI UCC28C45DRG4 orderable-part details.
- Technical source: TI UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller datasheet, document SLUS458I (Rev. I).
Applications
TI lists boost, buck, flyback, forward, and SEPIC among the control topologies for the UCC28C45 family. Suitability depends on the selected power-stage design and the controller's duty-cycle limit.
DC/DC Conversion
Current-mode control for regulated converters where the 8.4 V/7.6 V UVLO window fits the available bias supply.
Flyback Supplies
Peak current-mode operation for a flyback power stage with appropriate transformer, snubber, current-sense, and feedback design.
Forward and Other Converters
May be evaluated for forward, buck, boost, or SEPIC designs after verifying duty-cycle and compensation requirements.
Controller Replacement
The SOIC orderable code can be used when matching a documented bill of materials or servicing an existing design.
Quality & Authenticity
- Part identification: confirm the full ordering code, SOIC-8 package, pin-1 orientation, and TI-listed device marking.
- Packaging: record reel label, lot information, and handling condition when traceability is required.
- Assembly: follow the latest TI moisture, reflow, ESD, and land-pattern guidance for the orderable part.
- Source control: retain purchase and traceability records according to the project's procurement requirements.
FAQ
How does UCC28C45DRG4 compare with UCC28C45DR?
What is the difference between UCC28C45DRG4 and UCC28C45DGKR?
Does a 1 MHz oscillator mean a 1 MHz gate-drive output?
Can this controller operate from a 20 V VDD supply?
Which alternatives to UCC28C45DRG4 are listed here?
Engineering Notice
UCC28C45DRG4 Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 7.6V ~ 18V
- Frequency - Switching:
- Up to 1MHz
- Duty Cycle (Max):
- 48%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Frequency Control
- Operating Temperature:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
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