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UC285TD-3 Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce UC285TD-3
Description  FAST TRANSIENT REPONSE 5-A LOW-DROPOUT REGULATOR
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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UC2851, UC2852, UC2853, UC285ADJ, UC3851, UC3852, UC3853, UC385ADJ
FAST TRANSIENT RESPONSE 5A
LOW DROPOUT REGULATOR
SLUS212E − NOVEMBER 1999 − REVISED FEBRUARY 2004
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Fast Transient Response
D 10-mA to 5-A Load Current
D Short Circuit Protection
D Maximum Dropout of 500-mV at 5-A Load
Current
D Separate Bias (VB) and VIN Pins
D Available in Adjustable or Fixed Output
Voltages
D 5-Pin Package Allows Kelvin Sensing of
Load Voltage
D Reverse Current Protection
description
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.
block diagram
+
THERMAL
SHUTDOWN
1.2 V
BANDGAP
REFERENCE
R2
R1
3
5
SHORT
CIRCUIT
SENSE
2
1
4
UC382−ADJ
UC382−1 (1.5 V)
UC382−2 (2.1 V)
UC382−3 (2.5 V)
OPEN
0
2 k
500
2 k
1.5 k
2 k
2.16 k
R1
R2
ADJ
GND
VOUT
VIN
VB
UDG-00084
Copyright
 1998−2004, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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
All trademarks are the property of their respective owners.


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