Overview
The UCC28C44DRG4 is a high-performance, current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is part of the UCCx8C4x family, which offers enhanced BiCMOS versions with pin-to-pin compatibility to the industry standard UCx84xA and UCx84x families of PWM controllers. The UCC28C44DRG4 is designed to control fixed frequency, peak current-mode power supplies and is suitable for high-speed applications due to its high-frequency operation up to 1 MHz.
The BiCMOS technology used in this device provides lower power consumption, faster current sense, and oscillator frequency, making it more efficient compared to its predecessors. It is available in an 8-pin SOIC (D) package and operates over a wide temperature range from –40°C to 125°C.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SOIC (D) | 8 pins |
| Operating Temperature Range | °C | -40 to 125 |
| Operating Frequency | Maximum | 1 MHz |
| Startup Current | Typical | 50 µA |
| Maximum Startup Current | 100 µA | |
| Operating Current | At fOSC = 52 kHz | 2.3 mA |
| Current-Sense-to-Output Delay | 35 ns | |
| Peak Output Current | ±1 A | |
| Rise Time | 25 ns | |
| Fall Time | 20 ns | |
| Error Amplifier Reference | Accuracy | ±1% at 2.5 V |
| Undervoltage Lockout (UVLO) | Turn-on/Off Thresholds | 14.5 V / 9 V |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility.
- High-frequency operation up to 1 MHz, suitable for high-speed applications.
- Low startup and operating currents (50 µA startup, 2.3 mA operating at fOSC = 52 kHz) for improved efficiency.
- Fast cycle-by-cycle overcurrent limiting with a delay time of 35 ns.
- Peak driving current of ±1 A with rail-to-rail output, featuring 25 ns rise time and 20 ns fall time.
- ±1% accurate 2.5 V error amplifier reference.
- Trimmed oscillator discharge current for precise duty cycle and dead-time limit programming.
- Undervoltage lockout protections with turn-on and turn-off thresholds of 14.5 V and 9 V, respectively.
- Available in 8-pin SOIC (D) and VSSOP (DGK) packages, minimizing board space.
Applications
- Switch-mode power supplies.
- General-purpose single-ended DC-DC or off-line isolated power converters.
- Board mount power modules.
Q & A
- What is the maximum operating frequency of the UCC28C44DRG4?
The maximum operating frequency is 1 MHz.
- What is the startup current of the UCC28C44DRG4?
The startup current is typically 50 µA, with a maximum of 100 µA.
- What is the operating current of the UCC28C44DRG4 at 52 kHz oscillator frequency?
The operating current is 2.3 mA at fOSC = 52 kHz.
- What is the current-sense-to-output delay time of the UCC28C44DRG4?
The delay time is 35 ns.
- What is the peak output current capability of the UCC28C44DRG4?
The peak output current is ±1 A.
- What are the rise and fall times of the output signal?
The rise time is 25 ns, and the fall time is 20 ns.
- What is the accuracy of the error amplifier reference voltage?
The error amplifier reference voltage has an accuracy of ±1% at 2.5 V.
- What are the undervoltage lockout thresholds for the UCC28C44DRG4?
The turn-on threshold is 14.5 V, and the turn-off threshold is 9 V.
- In what packages is the UCC28C44DRG4 available?
The device is available in 8-pin SOIC (D) and VSSOP (DGK) packages.
- What is the operating temperature range of the UCC28C44DRG4?
The operating temperature range is from –40°C to 125°C.
