UC385TD-1 ,1electrical characteristics unless otherwise stated, these parameters apply for T = −40°C to 100°CAf ..
UC385TD-2 ,1maximum ratings over operating free-air temperature (unless otherwise noted)VB . . . . . . . . . . ..
UC385TD-3 ,1 ..
UC385TD-3 ,1block diagramVB1R1 R2UC382−ADJ OPEN 0UC382−1 (1.5 V) 2 kΩ 500 ΩUC382−2 (2.1 V) 2 kΩ 1.5 k ΩUC382−3 ..
UC385TD-ADJ ,1electrical characteristics unless otherwise stated, these parameters apply for T = −40°C to 100°CAf ..
UC385TDKTTT-1 ,1maximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
UN5217 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN5217 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN5219 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN5219 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN521D ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN521D ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UC385T-1-UC385T-2-UC385T-3-UC385T-ADJ-UC385TD-1-UC385TD-2-UC385TD-3-UC385TD-ADJ-UC385TDKTTT-1-UC385TDKTTT-ADJ-UC385TDTR-3-UC385TDTR-3G3-UC385TDTR-ADJ
1
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SLUS212F − NOVEMBER 1999 − REVISED MAY 2009
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
descriptionThe 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.
block diagramADJGND VOUT
VIN
UDG-00084
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
5-PIN TO-263
TD PACKAGE
(TOP VIEW)
5-PIN TO-220
T PACKAGE (TOP VIEW)Note: Tab = Ground
