Product details


Output options Adjustable Output, Fixed Output Iout (Max) (A) 5 Vin (Max) (V) 7.5 Vin (Min) (V) 1.7 Vout (Max) (V) 6 Vout (Min) (V) 1.2 Fixed output options (V) 1.5, 2.1, 2.5 Iq (Typ) (mA) 40 Load capacitance (Min) (µF) 100 Rating Catalog Regulated outputs (#) 1 Features Reverse Current Protection Accuracy (%) 1.3 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 350 Operating temperature range (C) 0 to 70 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

TO-220 (KC) 5 86 mm² 8.51 x 10.16 TO-263 (KTT) 5 155 mm² 10.16 x 15.24 open-in-new Find other Linear regulators (LDO)


  • Fast Transient Response
  • 10-mA to 5-A Load Current
  • Short Circuit Protection
  • Maximum Dropout of 500-mV at 5-A Load Current
  • Separate Bias (VB) and VIN Pins
  • Available in Adjustable or Fixed Output Voltages
  • 5-Pin Package Allows Kelvin Sensing of Load Voltage
  • Reverse Current Protection

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The UC385 is a low dropout linear regulator providing a quick response to fast load changes. Combined with its precision onboard reference, the UC385 excels at driving GTL and BTL buses. Due to its fast response to load transients, the total capacitance required to decouple the regulator’s output can be significantly decreased when compared to standard LDO linear regulators.

Dropout voltage (VIN to VOUT) is only 490 mV maximum and 350 mV typical at 5-A load (0°C to 100°C).

The onboard bandgap reference is stable with temperature and scaled for a 1.2 V input to the internal power amplifier. The UC385 is available in fixed output voltages of 1.5 V, 2.1 V, or 2.5 V. The output voltage of the adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2 V.

open-in-new Find other Linear regulators (LDO)
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Technical documentation

= Featured
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Type Title Date
* Datasheet Fast Transient Response, 5-A Low-Dropout Regulator datasheet (Rev. F) May 05, 2009
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Application notes LDO Noise Demystified (Rev. A) Aug. 09, 2017
Application notes LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
User guides DEM-TO263LDO Demonstration Fixture Oct. 15, 2003
User guides UC385EVM-207 High-Current, Low Input Voltage, Dropout Linear Regulator EVM Aug. 02, 2002
Application notes High Current LDO Linear Reglators (UCCx81-ADJ, UCx82-ADJ, UCCx83-ADJ, UCx85-AD May 07, 2002

Design & development

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

Hardware development

TPS72518 Evaluation Module
document-generic User guide

The TPS72518EVM is a tool to facilitate evaluation of the TPS725xx and TPS726xx families of devices. The TPS72518EVM consists of the SLVP207 PCB, one TPS72518 1.8-V, 1-A linear regulator in a TO-263 package, and supporting passive components. The SLVP207 PCB is designed to accommodate multiple (...)

document-generic User guide

The UC385EVM-207 is a tool to facilitate evaluation of the UCx82-x and UCx85-x families of devices. The UC385EVM consists of the SLVP207 PCB, one UC385-ADJ adjustable, 5-A linear regulator in a TO-263 package, and supporting passive components. The adjustable device has been configured to output 1.2 (...)

CAD/CAE symbols

Package Pins Download
DDPAK/TO-263 (KTT) 5 View options
TO-220 (KC) 5 View options

Ordering & quality

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