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UCC381DPTR-5 Datasheet

  • UCC381DPTR-5

  • Low Dropout 1 Ampere Linear Regulator Family

  • 10頁

  • TI

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UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
Low Dropout 1 Ampere Linear Regulator Family
FEATURES
鈥?/div>
Precision Positive Linear Voltage
Regulation
鈥?/div>
0.5V Dropout at 1A
鈥?/div>
Guaranteed Reverse Input/ Output
Voltage Isolation with Low Leakage
鈥?/div>
Low Quiescent Current Irrespective of
Load
鈥?/div>
Adjustable Output Voltage Version
鈥?/div>
Fixed Versions for 3.3V and 5V
Outputs
鈥?/div>
Logic Shutdown Capability
鈥?/div>
Short Circuit Power Limit of
3%
鈥?/div>
V
IN
鈥?/div>
Current Limit
鈥?/div>
Remote Load Voltage for Accurate
Load Regulation
DESCRIPTION
The UCC381-3/-5/-ADJ family of positive linear series pass regulators is
tailored for low drop out applications where low quiescent power is impor-
tant. Fabricated with a BiCMOS technology ideally suited for low input to
output differential applications, the UCC381 will pass 1A while requiring
only 0.5V of input voltage headroom. Dropout voltage decreases linearly
with output current, so that dropout at 200mA is less than 100mV. Quies-
cent current is always less than 650碌A. To prevent reverse current conduc-
tion, on-chip circuitry limits the minimum forward voltage to typically 50mV.
Once the forward voltage limit is reached, the input-output differential volt-
age is maintained as the input voltage drops until undervoltage lockout dis-
ables the regulator.
UCC381-3 and UCC381-5 versions have on-chip resistor networks preset
to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing
of the load voltage is possible by connecting the VOUTS pin directly at the
load. The output voltage is then regulated to 1.5% at room temperature and
better than 2.5% over temperature. The UCC381-ADJ version has a regu-
lated output voltage programmed by an external user-definable resistor ra-
tio.
(continued)
BLOCK DIAGRAM
VIN
8
V
PUMP
CURRENT
LIMIT
1.3/2.1A
CURRENT
REFERENCE
鈥?/div>
+
VOLTAGE
AMPLIFIER
鈥?/div>
+
R2
1
4
VOUT
VOUTS
2
1.25V
3
R1
6
GND
GND
GND
GND
SHUTDOWN FOR FIXED VERSIONS
CT*
5
0.65V
3% DUTY CYCLE
CURRENT LIMIT TIMER
REVERSE VOLTAGE
SENSE
UVLO
THERMAL
SHUTDOWN
R2
UCC381-ADJ
UCC381-3
UCC381-5
7
*ADJ
VERSION
ONLY
R1
0 OPEN
82k
150k
50k
50k
UDG-98112
SLUS214B -JANUARY
2001

UCC381DPTR-5 產(chǎn)品屬性

  • 1

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 線性

  • -

  • 正，固定式

  • 5V

  • 最高 9V

  • 0.5V @ 1A

  • 1

  • 1A（最小值）

  • 0°C ~ 70°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • Digi-Reel®

  • 296-29081-6

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