1 Features

1? Equally Usable for Either Positive or Negative

Regulator Design

? Adjustable Low Threshold Current Sense

Amplifier

? Undervoltage and Overvoltage Fault Alert With

Programmable Delay

2 Applications

? Wireless LAN

? Programmable Logic Controller

? Motor Control and Drives

? Solar Energy Systems

? Sonar, Ultrasound

3 Description

The UC1834-DIE integrated circuit is optimized for

the design of low input-output differential linear

regulator. A high-gain amplifier and sink or source

drive outputs facilitate high-output current designs,

which use an external pass device. With both positive

and negative precision references, either polarity of

regulator can be implemented. A current sense

amplifier with a low, adjustable threshold can be used

to sense and limit currents in either the positive or negative supply lines.

In addition, the UC1834-DIE has a fault monitoring circuit which senses both undervoltage and

overvoltage fault conditions. After a user defined

delay for transient rejection, this circuitry provides a

fault alert output for either fault condition. In the overvoltage case, a crowbar output is activated. An

overvoltage latch maintains the crowbar output and

can be used to shutdown the driver outputs. System

control to the device can be accommodated at a

single input, which will act as both a supply reset and

remote shutdown terminal. These die are protected

against excessive power dissipation by an internal

thermal shutdown function.