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 7812
3-terminal 1 A positive voltage regulator
Features
• Output Current up to 1 A
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Protection
Absolute Maximum Ratings (Ta = 25 OC)
Parameter
Symbol
Value
Units
Input Voltage
VI
35
V
Thermal Resistance Junction-Cases
RθJC
5
O
C/W
Thermal Resistance Junction-Air
RθJA
65
O
C/W
Operating Temperature Range
TOPR
0 to + 125
O
C
Storage Temperature Range
TS
- 65 to + 150
O
C
Electrical Characteristics
(0 OC < TJ < 125 OC, IO = 500 mA, VI = 19 V, CI = 0.33 µF, CO = 0.1 µF, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
TJ = + 25 OC
11.5
12
12.5
Output Voltage
VO
5 mA
≤ IO ≤ 1 A, PO ≤ 15 W
VI = 14.5 V to 27 V
11.4
12
12.6
V
VI = 14.5 V to 30 V
-
-
240
Line Regulation
1)
Regline
TJ = + 25 OC
VI = 16 V to 22 V
-
-
120
mV
IO = 5 mA to 1.5 A
-
-
240
Load Regulation
1)
Regload
TJ = + 25 OC
IO = 250 mA to 750 mA
-
-
120
mV
Quiescent Current
IQ
TJ = + 25 OC
-
-
8
mA
IO = 5 mA to 1 A
-
-
0.5
Quiescent Current Change
ΔIQ
VI = 14.5 V to 30 V
-
-
1
mA
Output Voltage Drift
ΔVO/ΔT
IO = 5 mA
-
-1
-
mV/OC
Output Noise Voltage
VN
f = 10 Hz to 100 KHz, TA = + 25 OC
-
76
-
µV
Ripple Rejection
RR
f = 120 Hz, VI = 15 V to 25 V
55
-
-
dB
Dropout Voltage
VDrop
IO = 1 A, TJ = + 25 OC
-
2
-
V
Output Resistance
RO
f = 1 KHz
-
18
-
mΩ
Short Circuit Current
ISC
VI = 35 V, TA = + 25 OC
-
230
-
mA
Peak Current
IPK
TJ = + 25 OC
-
2.2
-
A
1) Load and line regulation are specified at constant junction temperature, Changes in Vo due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
TO-220 Plastic Package
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