UC3832NG4 DESCRIPTION
The UC2832 and UC3833 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 dissipa tion of the external pass transistor during fault conditions.When the load cur rent 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-ra tio 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 con- trol, high initial load demands and short circuit protection may both be accom- modated without extra heat sinking or foldback current limiting.Additionally,if the timer pin is groundedthe duty-ratio timer is disabledand the IC operates in constant-voltage/constant-current regulating mode.
UC3832NG4 FEATURES
Precision 1% Reference
Over-Current Sense Threshold
Accurate to 5%
Programmable Duty-Ratio Over-Current Protection
4.5Vto36VOperation
100mAOutput DriveSourceor
Sink
Under-VoltageLockout
Additional Features of the UC2832 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
UC3832NG4 Applications
DDR TerminatorVTT supply
