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Dated : 21/06/2006
SEMTECH ELECTRONICS LTD.
(Subsidiary of Sino-Tech International Holdings Limited, a company
listed on the Hong Kong Stock Exchange, Stock Code: 724)
®
ST 78L12U
3-Terminal Positive Voltage Regulator
Absolute Maximum Ratings (Ta = 25 OC)
Parameter
Symbol
Rating
Unit
Input Voltage
VI
35
V
Power Dissipation
Ptot
800
1)
mW
Operating Temperature
Topr
- 20 to + 120
O
C
Storage Temperature Range
Ts
- 55 to +150
O
C
1) 15 mm X 25 mm X 0.7 mm alumina ceramic board, T
a ≤ 25
O
C
Electrical Characteristics (Ta = 25 OC)
(Unless otherwise specified, 0 OC ≤ TJ ≤ 125 OC, VI = 19 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF)
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Tj = 25 OC
11.5
12
12.5
V
14.5 V ≤ VI ≤ 27 V, 1 mA ≤ IO ≤ 40 mA
11.4
-
12.6
V
Output Voltage
VO
VI = 19 V, 1 mA ≤ IO ≤ 70 mA
11.4
-
12.6
V
14.5 V
≤ VI ≤ 27 V, Tj = 25 OC
-
-
250
Line Regulation
Regline
16 V
≤ VI ≤ 27 V, Tj = 25 OC
-
-
200
mV
1 mA ≤ IO ≤ 100 mA, Tj = 25 OC
-
-
100
Load Regulation
Regload
1 mA ≤ IO ≤ 40 mA, Tj = 25 OC
-
-
50
mV
Quiescent Current
IQ
Tj = 25 OC
-
-
6
mA
16 V
≤ VI ≤ 27 V
-
-
1.5
Quiescent Current Change
ΔIQ
1 mA
≤ IO ≤ 40 mA
-
-
0.1
mA
Output Noise Voltage
VN
10 Hz
≤ f ≤ 100 KHz, Tj = 25 OC
-
80
-
µV
Ripple Rejection
RR
f = 120 Hz, 15 V
≤ VI ≤ 25 V, Tj = 25 OC
37
-
-
dB
Dropout Voltage
VDrop
Tj = 25 °C
-
1.7
-
V
78L12U
1Vo
C2
0.1 µF
2
3
Vi
C1
0.33 µF