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參數(shù)資料
| 型號： | UCC384-x |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Dropout 0.5A Negative Linear Regulator |
| 中文描述： | 低壓差線性穩(wěn)壓器0.5A的負 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 182K |
| 代理商： | UCC384-X |
UCC284-5/-12/-ADJ
UCC384-5/-12/-ADJ
SLUS234A - JANUARY 2000
FEATURES
Precision Negative Series
Pass Voltage Regulation
0.2V Drop Out at 0.5A
Wide Input voltage Range
–3.2V to –15V
Low Quiescent Current
Irrespective of Load
Simple Logic Shutdown
Interfacing
–5V, –12V and Adjustable
Output
2.5% Duty Cycle Short Circuit
Protection
Remote Load Sensing for
Accurate Load Regulation
8-Pin DP Package
Low Dropout 0.5A Negative Linear Regulator
3
8
2
6
7
5
+
GM
–
R1
R2
1
4
GND
VOUTS
VOUT
+
–
+
–
1.25V
–2.6V
–1.6V
OVERCURRENT
S
Q
Q
R
THERMAL
SHUTDOWN
1
μ
A
DISCHARGE
40
μ
A
CHARGE
VPUMP
SD/CT
700mA
50k
TON
TOFF
UVLO
VIN
VIN
VIN
VIN
–2.2V
R1
R2
0
OPEN
UCC384-ADJ
UCC384-5
UCC384-12
375K
375K
125K
43.6K
+
–
+
–
SHUTDOWN
–0.6V
(–)
(–)
(+)
BLOCK DIAGRAM
UDG-99030
The UCC384 family of negative linear series pass regula-
tors is tailored for low drop out applications where low
quiescent
power
is
important.
BCDMOS technology ideally suited for low input to out-
put differential applications, the UCC384 will pass 0.5A
while requiring only 0.2V of input voltage headroom.
Drop out voltage decreases linearly with output current,
so that drop out at 50mA is less than 20mV.
Fabricated
with
a
Quiescent current consumption for the device under nor-
mal (non-drop out) conditions is typically 200
μ
A. An inte-
grated charge pump is internally enabled only when the
device is operating near drop out with low VIN. This
guarantees that the device will meet the drop out specifi-
cations even for maximum load current and a VIN of
–3.2V with only a modest increase in quiescent current.
Quiescent current is always less than 350
μ
A, with the
charge pump enabled. Quiescent current of the UCC384
does not increase with load current.
Short circuit current is internally limited. The device re-
sponds to a sustained over current condition by turning
off after a T
ON
delay. The device then stays off for a pe-
riod, T
OFF
, that is 40 times the T
ON
delay. The device
then begins pulsing on and off at the T
ON/
T
OFF
duty cycle
of 2.5%. This drastically reduces the power dissipation
during short circuit such that heat sinking, if at all re-
quired, must only accommodate normal operation. An
external capacitor sets the on time. The off time is al-
ways 40 times T
ON
.
The UCC384 can be shutdown to 45
μ
A (maximum) by
pulling the SD/CT pin more positive than –0.6V. To allow
for simpler interfacing, the SD/CT pin may be pulled up
to +6V above the ground pin without turning on clamping
diodes.
Internal power dissipation is further controlled with ther-
mal overload protection circuitry. Thermal shutdown oc-
curs if the junction temperature exceeds 140°C. The chip
will remain off until the temperature has dropped 20°C.
DESCRIPTION
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