UC1832

ACTIVE

Precision Low Dropout Linear Controllers

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Product details

Output options Adjustable Output Iout (max) (A) 0.45 Vin (max) (V) 40 Vin (min) (V) 4.5 Vout (min) (V) 1.98 Fixed output options (V) 2 Noise (µVrms) 0 Iq (typ) (mA) 3.3 Thermal resistance θJA (°C/W) 0 Rating Military Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable Accuracy (%) 5 PSRR at 100 KHz (dB) 90 Dropout voltage (Vdo) (typ) (mV) 0 Operating temperature range (°C) -55 to 125
Output options Adjustable Output Iout (max) (A) 0.45 Vin (max) (V) 40 Vin (min) (V) 4.5 Vout (min) (V) 1.98 Fixed output options (V) 2 Noise (µVrms) 0 Iq (typ) (mA) 3.3 Thermal resistance θJA (°C/W) 0 Rating Military Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable Accuracy (%) 5 PSRR at 100 KHz (dB) 90 Dropout voltage (Vdo) (typ) (mV) 0 Operating temperature range (°C) -55 to 125
CDIP (J) 14 130.4652 mm² 19.56 x 6.67 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • Precision 1% Reference
  • Over-Current Sense Threshold Accurate to 5%
  • Programmable Duty-Ratio Over-Current Protection
  • 4.5 V to 36 V Operation
  • 100mA Output Drive, Source, or Sink
  • Under-Voltage Lockout
  • 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

  • Precision 1% Reference
  • Over-Current Sense Threshold Accurate to 5%
  • Programmable Duty-Ratio Over-Current Protection
  • 4.5 V to 36 V Operation
  • 100mA Output Drive, Source, or Sink
  • Under-Voltage Lockout
  • 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

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 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.

These IC’'s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high current driver that has both source and sink outputs, allowing the use of either NPN or PNP external pass transistors. Safe operation is assured by the inclusion of under-voltage lockout (UVLO) and thermal shutdown.

The UC3833 family includes the basic functions of this design in a low-cost, 8-pin mini-dip package, while the UC2832 series provides added versatility with the availability of 14 pins. Packaging options include plastic (N suffix), or ceramic (J suffix). Specified operating temperature ranges are: commercial (0°C to 70°C), order UC3832/3 (N or J); and industrial (–40°C to 85°C), order UC2832/3 (N or J). Surface mount packaging is also available.

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 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.

These IC’'s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high current driver that has both source and sink outputs, allowing the use of either NPN or PNP external pass transistors. Safe operation is assured by the inclusion of under-voltage lockout (UVLO) and thermal shutdown.

The UC3833 family includes the basic functions of this design in a low-cost, 8-pin mini-dip package, while the UC2832 series provides added versatility with the availability of 14 pins. Packaging options include plastic (N suffix), or ceramic (J suffix). Specified operating temperature ranges are: commercial (0°C to 70°C), order UC3832/3 (N or J); and industrial (–40°C to 85°C), order UC2832/3 (N or J). Surface mount packaging is also available.

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Technical documentation

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Type Title Date
* Data sheet Precision Low Dropout Linear Controllers datasheet (Rev. A) 03 Jun 2003
* SMD UC1832 SMD 5962-93265 21 Jun 2016
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
Application note Using the UCx832 Linear Controller With an NMOS Pass Element 11 Aug 2008
Application note DN-32 Optocoupler Feedback Drive Techniques 05 Sep 1999
Application note U-152 A High-Performance Linear Regulator for Low Dropout Applications 05 Sep 1999

Design & development

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

Simulation model

UCx832 PSpice Average Model

SLUM079.ZIP (70 KB) - PSpice Model
Simulation model

UCx832 PSpice Transient Model

SLUM070.ZIP (40 KB) - PSpice Model
Simulation model

UCx832 TINA-TI Average Reference Design

SLUM128.TSC (124 KB) - TINA-TI Reference Design
Simulation model

UCx832 TINA-TI Average Spice Model

SLUM127.ZIP (14 KB) - TINA-TI Spice Model
Simulation model

UCx832 TINA-TI Transient Reference Design

SLUM130.TSC (134 KB) - TINA-TI Reference Design
Simulation model

UCx832 TINA-TI Transient Spice Model

SLUM129.ZIP (20 KB) - TINA-TI Spice Model
Package Pins Download
CDIP (J) 14 View options
LCCC (FK) 20 View options

Ordering & quality

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