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UCC284- Datasheet

  • UCC284-

  • Low Dropout 0.5A Negative Linear Regulator

  • 10頁(yè)

  • TI

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UCC284-5/-12/-ADJ
UCC384-5/-12/-ADJ
Low Dropout 0.5A Negative Linear Regulator
FEATURES
鈥?/div>
Precision Negative Series
Pass Voltage Regulation
鈥?/div>
0.2V Drop Out at 0.5A
鈥?/div>
Wide Input voltage Range
鈥?.2V to 鈥?5V
鈥?/div>
Low Quiescent Current
Irrespective of Load
鈥?/div>
Simple Logic Shutdown
Interfacing
鈥?/div>
鈥?V, 鈥?2V and Adjustable
Output
鈥?/div>
2.5% Duty Cycle Short Circuit
Protection
鈥?/div>
Remote Load Sensing for
Accurate Load Regulation
鈥?/div>
8-Pin DP Package
VIN
VIN
VIN
VIN
(鈥?
2
3
6
7
鈥?.6V
SD/CT
8
鈥?.6V
+
鈥?/div>
+
GM
鈥?/div>
40碌A(chǔ)
CHARGE
OVERCURRENT
700mA
鈥?/div>
+
THERMAL
SHUTDOWN
R1
4
1碌A(chǔ)
DISCHARGE
UCC384-ADJ
+
鈥?.6V
鈥?/div>
50k
SHUTDOWN
鈥?.2V
1.25V
UCC384-5
UCC384-12
R1
0
R2
OPEN
R2
BLOCK DIAGRAM
(+)
GND
375K 125K
375K 43.6K
+
鈥?/div>
S
R
Q
Q
TON
TOFF
VPUMP
1
VOUTS
UVLO
5
VOUT
(鈥?
UDG-99030
DESCRIPTION
The UCC384 family of negative linear series pass regula-
tors is tailored for low drop out applications where low
quiescent power is important. Fabricated with a
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.
Quiescent current consumption for the device under nor-
mal (non-drop out) conditions is typically 200碌A(chǔ). 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
鈥?.2V with only a modest increase in quiescent current.
Quiescent current is always less than 350碌A(chǔ), with the
charge pump enabled. Quiescent current of the UCC384
does not increase with load current.
SLUS234A - JANUARY 2000
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碌A(chǔ) (maximum) by
pulling the SD/CT pin more positive than 鈥?.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擄C. The chip
will remain off until the temperature has dropped 20擄C.

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