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Complete Control for a High Current,
Low Dropout, Linear Regulator
Fixed 5V or Adjustable Output Voltage
Accurate 2.5A Current Limiting with
Foldback
Internal Current Sense Resistor
Remote Sense for Improved Load
Regulation
External Shutdown
Under-Voltage Lockout and Reverse
Voltage Protection
Thermal Shutdown Protection
8 Pin Mini-Dip Package
(Surface Mount also Available)
DESCRIPTION
The UC1835/6 families of linear controllers are optimized for the de-
sign of low cost, low dropout, linear regulators. Using an external pass
element, dropout voltages of less than 0.5V are readily obtained.
These devices contain a high gain error amplifier, a 250mA output
driver, and a precision reference. In addition, current sense with fold-
back provides for a 2.5A peak output current dropping to less than
0.5A at short circuit.
These devices are available in fixed, 5V, (UC1835), or adjustable,
(UC1836), versions. In the fixed 5 volt version, the only external parts
required are an external pass element, an output capacitor, and a com-
pensation capacitor. On the adjustable version the output voltage can
be set anywhere from 2.5V to 35V with two external resistors.
Additional features of these devices include under-voltage lockout for
predictable start-up, thermal shutdown and short circuit current limiting
to protect the driver device. On the fixed voltage version, a reverse
voltage comparator minimizes reverse load current in the event of a
negative input to output differential.
BLOCK DIAGRAM
Note: Pin numbers refer to 8-Pin DIL Package
8/94
1
2
3
4
5
