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AP Semiconductor

LM7912 Datasheet Preview

LM7912 Datasheet

3-Terminal Negative voltage Regulators

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LM79XX
3-Terminal
Negative voltage Regulators
DESCRIPTION
These voltage regulators are designed as fixed negative voltage regulators for a
wide variety of applications including local, on-card regulation. Although designed
primarily as a fixed voltage regulator, these devices can be used with external
components to obtain adjustable voltages and currents.
FEATURES
Output current in excess of 1.0A
No external components required
Output Voltages (-5V, -6V, -8V, -9V, -10V, -12V, -15V, -18V)
Internal Thermal shutdown and SOA protection
Output voltage offered in 4% Tolerance
Pb-Free Packages are available
High ESD Level (HBM>8000V, MM>800V)
TYPICAL APPLICATION
The input voltage must remain typically
2.0V above the output voltage even during
the low point on the ripple voltage.
* CI is required if regulator is located
an appreciable Distance from power filter.
* CO improves transient response.
Values of 1.0 µF could cause instability.
Input
2
Output
3
1
CI CO
2.2uF
1.0uF
1.0A ,Negative voltage Regulators
www.apsemi.com
REV. 03
1




AP Semiconductor

LM7912 Datasheet Preview

LM7912 Datasheet

3-Terminal Negative voltage Regulators

No Preview Available !

LM79XX
Maximum Ratings (TA=25 °C, unless otherwise noted)
Rating
Symbol
Value
Unit
TO-220F TO-220 TO-252
Input Voltage
-5V ~ -18V
VI
-35 V
-24V
-40
Power Dissipation
Thermal Resistance of Junction to Ambient
Thermal Resistance of Junction to Case
Storage Temperature
Junction Temperature
Operating Temperature
PD
RθJA
RθJC
TSTG
TJ
TOPR
22
65 65
55
-55 ~ 125
+ 150
-40 ~ 125
1.3
92
5
W
°C/W
°C/W
°C
°C
°C
Stresses exceeding Maximum ratings may damage the device. Maximum ratings are stress ratings.
Functional operation above the recommended operating conditions is not implied.
Extended exposure to stresses the above the recommended operating conditions may affect
device reliability.
PD(max) = (TJ(max)–TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in
excessive die temperature, and the regulator will go into thermal shutdown.
Representative Schematic of LM79XX
R15 R18
R21
Q22
R22
D1 R1 Q17
Q19 Q21
Q24
C1
D2 + Q20
Q18 D5 Q23
GND
R13 R12
D3 R14
Q2 Q3
R17 R19 R20
R0
Q4
Q7
Q6
Q5
R2
R22A
Q12 Q13
Q26 Q27
R10
D4
R11
OUTPUT
Q8
Q9
R3
C2 C3
++
Q10 Q11
R4 R5
Q14
Q15
R9
R6
R7
Q16
R8
www.apsemi.com
INPUT
REV. 03
2


Part Number LM7912
Description 3-Terminal Negative voltage Regulators
Maker AP Semiconductor
Total Page 14 Pages
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