UC2835

ACTIVE

36-V, linear voltage regulator controller

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LM1085 ACTIVE 3-A, 29-V, linear voltage regulator Similar product with wider operating temperature range

Product details

Output options Fixed Output Vin (max) (V) 36 Vin (min) (V) 6 Vout (max) (V) 35 Vout (min) (V) 2 Fixed output options (V) 5 Iq (typ) (mA) 3.7 Thermal resistance θJA (°C/W) 108 Rating Catalog Load capacitance (min) (µF) 10 Accuracy (%) 1.2 Operating temperature range (°C) -25 to 85
Output options Fixed Output Vin (max) (V) 36 Vin (min) (V) 6 Vout (max) (V) 35 Vout (min) (V) 2 Fixed output options (V) 5 Iq (typ) (mA) 3.7 Thermal resistance θJA (°C/W) 108 Rating Catalog Load capacitance (min) (µF) 10 Accuracy (%) 1.2 Operating temperature range (°C) -25 to 85
SOIC (D) 8 29.4 mm² 4.9 x 6
  • 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)
  • 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)

The UC1835/6 families of linear controllers are optimized for the design 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 compensation 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.

The UC1835/6 families of linear controllers are optimized for the design 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 compensation 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.

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Technical documentation

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* Data sheet High Efficiency Regulator Controller datasheet 05 Sep 1999
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

UCx835 Family PSpice Average Model

SLUM086.ZIP (127 KB) - PSpice Model
Simulation model

UCx835 Family PSpice Transient Model

SLUM085.ZIP (61 KB) - PSpice Model
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SOIC (D) 8 View options

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