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 7812R
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.
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