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ST7812 Ver la hoja de datos (PDF) - Semtech Electronics LTD.

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ST7812 3-terminal 1 A positive voltage regulator Semtech-Electronics
Semtech Electronics LTD. Semtech-Electronics
ST7812 Datasheet PDF : 3 Pages
1 2 3
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
TO-220 Plastic Package
Absolute Maximum Ratings (Ta = 25 OC)
Parameter
Input Voltage
Thermal Resistance Junction-Cases
Thermal Resistance Junction-Air
Operating Temperature Range
Storage Temperature Range
Symbol
VI
RθJC
RθJA
TOPR
TS
Value
35
5
65
0 to + 125
- 65 to + 150
Units
V
OC/W
OC/W
OC
OC
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
V
11.4 12 12.6
Line Regulation 1)
Regline TJ = + 25 OC VI = 14.5 V to 30 V
VI = 16 V to 22 V
-
- 240
mV
-
- 120
Load Regulation 1)
Regload TJ = + 25 OC IO = 5 mA to 1.5 A
-
IO = 250 mA to 750 mA -
- 240
mV
- 120
Quiescent Current
IQ
TJ = + 25 OC
-
-
8
mA
Quiescent Current Change
ΔIQ
IO = 5 mA to 1 A
VI = 14.5 V to 30 V
-
- 0.5
mA
-
-
1
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
-
m
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.
SEMTECH ELECTRONICS LTD.
(Subsidiary of Sino-Tech International Holdings Limited, a company
listed on the Hong Kong Stock Exchange, Stock Code: 724)
®
Dated : 21/06/2006
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