Unitrode UC1874-2
The UC1874-1,-2 UC2874-1,-2 UC3874-1,-2 UC3874-1 is designed for logic level MOSFETs and has UVLO turn-on and turn-off thresholds of 4.5V and 4.4V respectively. The UC3874-2 is designed for standard power MOSFETs and has UVLO turn-on and turn-off thresholds of 10V and 9V respectively.| Part No. | UC1874-2 |
|---|---|
| Datasheet | UC1874-2 Download |
| Manufacturer |  Unitrode |
| Description | Step-down (Buck) Controllers |
| Buy | Stock & Price |
FEATURES
● Operation to 36V Input Voltage● Fixed Frequency Average Current Mode Control
● Standby Mode for Improved Efficiency at Light Load
● Drives External N-Channel MOSFETs for Highest Efficiency
● Sleep Mode Current < 50mA
● Complementary 1 Amp Outputs with Regulated Gate Drive Voltage
● LDO (Low Drop Out) Virtual 100% Duty Cycle Operation
● Non-Overlapping Gate Drives
DESCRIPTION
The UC3874 family of synchronous step-down (Buck) regulators provides high efficiency power conversion from an input voltage range of 4.5 to 36 volts. The UC3874 is tailored for battery powered applications such as laptop computers, consumer products, communications systems, and aerospace which demand high performance and long battery life. The synchronous regulator replaces the catch diode in the standard buck regulator with a low Rds(on) N-channel MOSFET switch allowing for significant efficiency improvements. The high side N-channel MOSFET switch is driven out of phase from the low side N-channel MOSFET switch by an on-chip bootstrap circuit which requires only a single external capacitor to develop the regulated gate drive.
