Description
The UC2844AD is a positive, isolation-capable output step-up/step-down DC-DC controller IC from Texas Instruments. It's a current-mode PWM controller designed for use in voltage mode switching power supplies, battery chargers, LED drivers, and other power management applications. This device operates within a wide input voltage range of 7V to 30V, with an adjustable frequency up to 1MHz and a maximum duty cycle of 95%. It also features soft start capability, UVLO protection, thermal shutdown protection, and internal compensation for stable operation. The UC2844AD is suitable for low-power and industrial applications where precise power supply regulation and control are crucial.
Features
The UC2844AD features include:
- Current Mode PWM controller
- Operating voltage range of 7V to 30V
- Adjustable frequency up to 1MHz
- Maximum duty cycle of 95%
- Soft start capability
- UVLO protection
- Thermal shutdown protection
- Internal compensation for stable operation
Package
The UC2844AD comes in a 14-SOIC (0.154", 3.90mm Width) package.
Pinout
The UC2844AD has a 14-pin SOIC package. The pin functions are:
- Pin 1: VCC (Positive Supply Voltage)
- Pin 2-3: COMP (Compensation Network)
- Pin 4: FB (Feedback Input)
- Pin 5: OUT (Output)
- Pin 6: SHDN (Soft Start Enable)
- Pin 7: UVLO (Under-Voltage Lockout)
- Pin 8: THRM (Thermal Shutdown)
- Pin 9-10: CTRL (Control Inputs)
- Pin 11: GND (Ground)
- Pin 12: VCC (Positive Supply Voltage)
- Pin 13: OUT (Output)
- Pin 14: NC (No Connect)
The UC2844AD is a current-mode PWM controller with adjustable frequency up to 1MHz, making it suitable for various power management applications.
Manufacturer
The manufacturer of the UC2844AD is Texas Instruments (TI), a leading American technology company that designs, manufactures, and tests semiconductors and other electronic components. TI is a global semiconductor leader with a broad portfolio of innovative technologies and products that include analog and embedded processing chips, power management devices, and interface solutions.
Applications
According to the product information, the UC2844AD IC is commonly used in:
- Voltage mode switching power supplies
- Battery chargers
- LED drivers
- Other power management applications
It is specifically designed for low-power and industrial applications where regulation and control of power supply output are critical.
Equivalent
Based on the product information, the equivalent products of UC2844AD are likely to be other DC-DC controllers from Texas Instruments or other manufacturers that offer similar features such as current mode PWM control, adjustable frequency, and protection mechanisms like UVLO and thermal shutdown. Some possible alternatives could include the STMicroelectronics L6924A, ON Semiconductor NCP3801, or Analog Devices ADP8860.
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