UC3832N  Description

The UC1832 and UC1833 series of precision linear regulators include all the control functions required in the design of very low dropout linear regulators.

Additionally, they feature an innovative duty-ratio current limiting technique which provides peak load capability while limiting the average power dissipation of the external pass transistor during fault conditions. When the load current reaches an accurately programmed threshold, a gated-astable timer is enabled, which switches the regulator’s pass device off and on at an externally programmable duty ratio. During the on-time of the pass element, the output current is limited to a value slightly higher than the trip threshold of the duty-ratio timer. The constant-current-limit is programmable on the UCx832 to allow higher peak current during the on-time of the pass device. With duty-ratio control, high initial load demands and short circuit protection may both be accommodated without extra heat sinking or foldback current limiting. Additionally, if the timer pin is grounded, the duty-ratio timer is disabled, and the IC operates in constant-voltage/constant-current regulating mode.

UC3832N  Features

Precision 1% Reference

Over-Current Sense Threshold Accurate to 5%

Programmable Duty-Ratio Over-Current Protection

4.5V to 36V Operation

100mA Output Drive, Source, or Sink

Under-Voltage Lockout

Additional Features of the UC1832

series:

Adjustable Current Limit to Current Sense Ratio

Separate +VIN terminal

Programmable Driver Current Limit

Access to VREF and E/A(+)

Logic-Level Disable Input