UC1834
UC2834
UC3834
High Efficiency Linear Regulator
FEATURES
•
Minimum V
IN
- V
OUT
Less Than
0.5V At 5A Load With External
Pass Device
Equally Usable For Either Positive
or Negative Regulator Design
Adjustable Low Threshold Current
Sense Amplifier
Under And Over-Voltage Fault Alert
With Programmable Delay
Over-Voltage Fault Latch With
100mA Crowbar Drive Output
DESCRIPTION
The UC1834 family of integrated circuits is optimized for the design of low
input-output differential linear regulators. A high gain amplifier and 200mA
sink or source drive outputs facilitate high output current designs which use
an external pass device. With both positive and negative precision refer-
ences, either polarity of regulator can be implemented. A current sense am-
plifier with a low, adjustable, threshold can be used to sense and limit
currents in either the positive or negative supply lines.
In addition, this series of parts has a fault monitoring circuit which senses
both under and over-voltage fault conditions. After a user defined delay for
transient rejection, this circuitry provides a fault alert output for either fault
condition. In the over-voltage case, a 100mA crowbar output is activated.
An over-voltage latch will maintain the crowbar output and can be used to
shutdown the driver outputs. System control to the device can be accom-
modated at a single input which will act as both a supply reset and remote
shutdown terminal. These die are protected against excessive power dissi-
pation by an internal thermal shutdown function.
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BLOCK DIAGRAM
6/94
TI [ TEXAS INSTRUMENTS ]
