Specifications
| Type | Description |
|---|---|
| Part Number | UCC28C43 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | SOIC-8 (D), body size 3.91 mm × 4.90 mm |
| PWM Controller Type | BiCMOS low-power current-mode PWM controller; UCC28C43 family description |
| Operating Frequency Maximum | 1 MHz; feature list |
| Startup Current | 50 µA typical, 100 µA maximum; startup condition |
| Operating Current | 2.3 mA; fOSC = 52 kHz |
| Current Sense to Output Delay | 35 ns; cycle-by-cycle overcurrent limiting |
| Peak Output Drive Current | ±1 A; gate driver output |
| Output Rise Time | 25 ns; rail-to-rail output driver |
| Output Fall Time | 20 ns; rail-to-rail output driver |
| Error Amplifier Reference Accuracy | 2.5 V ±1%; noninverting error amplifier reference |
| UVLO Turn-On Voltage | 8.4 V; UCC28C43, DC/DC applications |
| UVLO Turn-Off Voltage | 7.6 V; UCC28C43, DC/DC applications |
| Maximum Duty Cycle | 100%; UCC28C43 device option |
| Operating Junction Temperature | -40°C to 125°C; UCC28C43 / UCC28C4x series |
| VDD Absolute Maximum Voltage | 20 V maximum; input voltage absolute maximum rating |
| VDD Absolute Maximum Current | 30 mA maximum; input current absolute maximum rating |
| Output Drive Current Absolute Maximum | ±1 A peak; output drive current |
| Output Energy Absolute Maximum | 5 µJ; capacitive load, EOUT |
| Analog Input Voltage Range | -0.3 V to 6.3 V; COMP, CS, FB, RT/CT pins absolute maximum |
| OUT Pin Voltage Range | -0.3 V to 20 V; output driver voltage absolute maximum |
| VREF Absolute Maximum Voltage | 7 V maximum; reference voltage |
| COMP Output Sink Current | 10 mA maximum; error amplifier output sink current |
| Operating Junction Temperature Absolute Maximum | -55°C to 150°C; TJ absolute maximum rating |
| Storage Temperature | -65°C to 150°C; Tstg absolute maximum rating |
| ESD HBM Rating | ±2500 V; human-body model, ANSI/ESDA/JEDEC JS-001 |
| ESD CDM Rating | ±1500 V; charged-device model, JEDEC JESD22-C101 |
| Recommended VDD Input Voltage | 18 V maximum; recommended operating condition |
| Recommended OUT Voltage | 18 V maximum; recommended operating condition |
| Recommended VREF External Voltage | 5.5 V maximum; maximum continuous voltage from external circuitry |
| Average Output Driver Current | 200 mA maximum; source and sink average current |
| Reference Output Current | 20 mA maximum; VREF source current |
| Junction-to-Ambient Thermal Resistance | 128.9 °C/W; D package SOIC-8 |
| Junction-to-Case Top Thermal Resistance | 71.7 °C/W; D package SOIC-8 |
| Junction-to-Board Thermal Resistance | 72.3 °C/W; D package SOIC-8 |
| VREF Initial Accuracy | 4.9 V min, 5 V typ, 5.1 V max; TJ = 25°C, IOUT = 1 mA |
| VREF Line Regulation | 0.2 mV typ, 20 mV max; VDD = 12 V to 18 V |
| VREF Load Regulation | 3 mV typ, 25 mV max; IOUT = 1 mA to 20 mA |
| VREF Temperature Stability | 0.2 mV/°C typ, 0.4 mV/°C max; electrical characteristics |
| VREF Total Output Variation | 4.82 V min, 5.18 V max; electrical characteristics |
| VREF Noise Voltage | 50 µV; 10 Hz to 10 kHz, TJ = 25°C |
| VREF Long-Term Stability | 5 mV typ, 25 mV max; 1000 hours, TJ = 125°C |
| VREF Short-Circuit Source Current | 30 mA min, 45 mA typ, 55 mA max; output short circuit |
| Oscillator Initial Accuracy | 50.5 kHz min, 53 kHz typ, 55 kHz max; TJ = 25°C, RRT = 10 kΩ, CCT = 3.3 nF |
| Oscillator Voltage Stability | 0.2% typ, 1% max; VDD = 12 V to 18 V |
| Oscillator Temperature Stability | 1% typ, 2.5% max; TJ min to TJ max |
| RT/CT Oscillator Amplitude | 1.9 V peak-to-peak; RT/CT pin |
| Oscillator Discharge Current | 7.7 mA min, 8.4 mA typ, 9 mA max; TJ = 25°C, VRT/CT = 2 V |
| Oscillator Discharge Current | 7.2 mA min, 8.4 mA typ, 9.5 mA max; VRT/CT = 2 V |
| Datasheet Status | request_only |
Product Overview
The UCC28C43 is a Texas Instruments BiCMOS low-power current-mode PWM controller in the Power_Management category. It is intended for current-mode control with cycle-by-cycle overcurrent limiting, supported by a 35 ns current-sense to output delay and a gate driver rated for ±1 A peak output drive current.
For DC/DC applications, the UCC28C43 option provides 8.4 V UVLO turn-on, 7.6 V UVLO turn-off, and 100% maximum duty cycle. The oscillator supports operation up to 1 MHz, with characterized 53 kHz typical initial accuracy using RRT = 10 kΩ and CCT = 3.3 nF, and a 1.9 V peak-to-peak RT/CT oscillator amplitude.
The device is offered in an SOIC-8 (D) package with 3.91 mm × 4.90 mm body size. Thermal data for this package includes 128.9 °C/W junction-to-ambient resistance, 71.7 °C/W junction-to-case top resistance, and 72.3 °C/W junction-to-board resistance. Recommended limits include 18 V maximum VDD and OUT voltage, 20 mA maximum VREF source current, and 200 mA maximum average output driver current.
Key Features
- BiCMOS low-power current-mode PWM controller architecture
- Supports operating frequencies up to 1 MHz
- 50 µA typical startup current, 100 µA maximum
- 2.3 mA operating current at 52 kHz
- 35 ns current-sense to output delay
- ±1 A peak gate-driver output current
- 25 ns rise time and 20 ns fall time
- 2.5 V ±1% error amplifier reference
- 8.4 V turn-on and 7.6 V turn-off UVLO
- 100% maximum duty cycle for UCC28C43 option
- -40°C to 125°C operating junction temperature
- SOIC-8 package with 3.91 mm × 4.90 mm body
Typical Applications
- DC/DC converter control
- Current-mode power supplies
- Gate-drive PWM stages
- Cycle-by-cycle overcurrent limiting circuits
- Low-startup-current power controllers
- 100% duty-cycle converter designs
- SOIC-8 power management assemblies
Procurement Notes
When requesting a quote for UCC28C43, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of controller is the UCC28C43?
The UCC28C43 is a Texas Instruments BiCMOS low-power current-mode PWM controller. It belongs to the Power_Management category and is specified with current-mode PWM control, cycle-by-cycle overcurrent limiting, and a gate-driver output.
What UVLO thresholds apply to the UCC28C43 option?
For the UCC28C43 device option used in DC/DC applications, the extracted datasheet facts list an 8.4 V UVLO turn-on voltage and a 7.6 V UVLO turn-off voltage.
What package is listed for the UCC28C43?
The listed package is SOIC-8, Texas Instruments D package, with a body size of 3.91 mm × 4.90 mm. Thermal data for this package includes 128.9 °C/W junction-to-ambient resistance.
What are the UCC28C43 output driver ratings?
The gate driver output is specified for ±1 A peak output drive current. The rail-to-rail output driver has a 25 ns rise time and 20 ns fall time, with 200 mA maximum recommended average source and sink current.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.