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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)： | 2/10頁 |
| 文件大?。?/td> | 102K |
| 代理商： | UCC381-X |
2
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
ABSOLUTE MAXIMUM RATINGS
VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V
CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.3 to 3V
Storage Temperature . . . . . . . . . . . . . . . . . . .
65
°
C to +150
°
C
Junction Temperature. . . . . . . . . . . . . . . . . . .
55
°
C to +150
°
C
Lead Temperature (Soldering, 10 sec.). . . . . . . . . . . . . +300
°
C
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages. All voltages are referenced to
GND.
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications hold for T
A
= 0
°
C to 70
°
C for the
UCC381-X series and
40
°
C to +85
°
C for the UCC283-X series, V
IN
= V
OUT
+ 1.5V, I
OUT
= 0mA, C
OUT
= 2.2
μ
F. C
T
= 1500pF for
the UCC381-ADJ version and V
OUT
set to 5V. T
J
= T
A
.
PARAMETER
TEST CONDITIONS
UCC381-5 Fixed 5V, 1A Family
Output Voltage
T
J
= 25°C
Over Temperature
Line Regulation
V
IN
= 5.15V to 9V
Load Regulation
I
OUT
= 0mA to 1A
Drop Out Voltage, V
IN
– V
OUT
I
OUT
= 1A, V
OUT
= 4.85V, TA < 85°C
I
OUT
= 200mA, V
OUT
= 4.85V, TA < 85°C
Peak Current Limit
V
OUT
= 0V
Overcurrent Threshold
Current Limit Duty Cycle
V
OUT
= 0V
Overcurrent Time Out, T
ON
V
OUT
= 0V
Quiescent Current
Quiescent Current in Shutdown
V
IN
= 9V
Shutdown Threshold
At C
T
Input
Reverse Leakage Current
1V < V
IN
< V
OUT
, V
OUT
< 5.1V, at V
OUT
UVLO Threshold
V
IN
where V
OUT
passes current
MIN
TYP
MAX
UNITS
4.925
4.875
5
5.075
5.125
3
5
0.6
200
3.5
1.8
5
1600
650
25
V
V
1
2
mV
mV
V
mV
A
A
%
μ
s
μ
A
μ
A
V
μ
A
V
0.5
100
2
1
3
400
750
400
10
0.65
0.25
75
3.0
2.5
2.8
Short circuit current is internally limited. The device re-
sponds to a sustained overcurrent condition by turning
off after a T
ON
delay. The device then stays off for a pe-
riod, T
OFF
, that is 32 times the T
ON
delay. The device
then begins pulsing on and off at the T
ON
/(T
ON
+T
OFF
)
duty cycle of 3%. This drastically reduces the power dis-
sipation during short circuit such that heat sinking, if at all
required, must only accommodate normal operation. On
the fixed output versions of the device T
ON
is fixed at
400
μ
s
a guaranteed minimum. On the adjustable ver-
sion an external capacitor sets the on time. The off time
is always 32 times T
ON
.
The UCC381 can be shutdown to 25
μ
A (max) by pulling
the CT pin low.
Internal power dissipation is further controlled with ther-
mal overload protection circuitry. Thermal shutdown oc-
curs if the junction temperature exceeds 165
°
C. The chip
will remain off until the temperature has dropped 20
°
C.
The UCC281 series is specified for operation over the in-
dustrial range of
40
°
C to +85
°
C, and the UCC381 se-
ries is specified from 0
°
C to +70
°
C. These devices are
available in the 8 pin DP surface mount power package.
For other packaging options consult the factory.
DESCRIPTION (cont.)
1
2
3
4
8
7
6
5
GND
VOUT
VOUTS
GND
GND
VIN
CT*
GND
CONNECTION DIAGRAMS
SOIC-8 (Top View)
DP Package
* ADJ version only
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