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參數(shù)資料
| 型號： | UCC381-x |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Dropout 1 Ampere Linear Regulator Family |
| 中文描述： | 低壓差一安培線性穩(wěn)壓器系列 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 102K |
| 代理商： | UCC381-X |
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
SLUS214
B
-
JANUARY
2001
FEATURES
Precision Positive Linear Voltage
Regulation
0.5V Dropout at 1A
Guaranteed Reverse Input/ Output
Voltage Isolation with Low Leakage
Low Quiescent Current Irrespective of
Load
Adjustable Output Voltage Version
Fixed Versions for 3.3V and 5V
Outputs
Logic Shutdown Capability
Short Circuit Power Limit of
3%
V
IN
Current Limit
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
μ
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)
Low Dropout 1 Ampere Linear Regulator Family
1
VOUT
2
GND
7
GND
R2
R1
+
–
V
PUMP
UVLO
+
–
8
1.3/2.1A
CURRENT
REFERENCE
VIN
UCC381-ADJ
UCC381-3
UCC381-5
R2
R1
0
OPEN
82k
50k
150k
50k
4
3
GND
6
GND
1.25V
VOUTS
VOLTAGE
AMPLIFIER
CURRENT
LIMIT
THERMAL
SHUTDOWN
REVERSE VOLTAGE
SENSE
3% DUTY CYCLE
CURRENT LIMIT TIMER
5
0.65V
CT*
SHUTDOWN FOR FIXED VERSIONS
*ADJ
VERSION
ONLY
BLOCK DIAGRAM
UDG-98112
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