Document
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
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REV. 03
1
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
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INPUT
REV. 03
2
LM79XX
Ordering Information
Part No
Package
Packing
LM79XXRTRL TO-252
Reel & Tape
LM79XXFTL TO-220F Tube
LM79XXTL
TO-220
Tube
Finish Halogen
Packing Unit
Remark
Sn Free
2,500ea
XX : Output Voltage option *
Sn Free
5,000ea
XX : Output Voltage option *
Sn Free
5,000ea
XX : Output Voltage option *
* Voltage option (XX) : -5V(05), -6V(06), -8V(08), -9V(09), -10V(10), -12V(12), -15V(15), -18V(18),-24V(24)
Package Outline
PIN INFO. 1. GND PIN 2. INPUT PIN 3. OUTPUT PIN
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REV. 03
3
LM79XX
Electrical characteristics
*Note 1 Line and Load regulation are specified at constant junction temperature. Changes of VO due to heating effects must be taken into account separately. Pulse testing with low duty circle is used.
Electrical characteristics (LM7905)
(TJ = 0 to 125 °C, VIN=10V, IO=500 mA, CI=2.2 µF, CO=1.0 µF, unless otherwise noted)
Characteristic
Symbol
Condition
Min
TJ=25°C
-4.8
Output voltage
VO 5.0mA ≤ IO ≤ 1.0A, PD≤15W -7.0V ≥ VIN ≥ -20.0V
-4.75
Line regulation (TJ=25°C)
Regline -7.0V ≥ VIN ≥ -25.0V
(Note 1)
-8.0V ≥ VIN ≥ -12.0V
Load regulation (TJ=25°C) (Note 1)
Regload 5.0 mA ≤ IO ≤ 1.5A 250 mA ≤ IO ≤ 750 mA
Quiescent current
IQ
TJ=25°C
Quiescent current change
Δ IQ
5.0 mA ≤ IO ≤ 1.0 A -8.0V ≥ VIN ≥ -25.0V
Output Voltage Drift
ΔVO/ΔT IO = 5.0 mA
Output noise voltage
VN 10 Hz ≤ f ≤ 100 KHz, TA=25°C
Ripple rejection
RR -8.0V ≥ VIN ≥ -18.0V, f=120 Hz
54
Dropout voltage
VDROP IO = 1.0A, TJ=25°C
Short circuit current limit
ISC VIN = -35V, TA=25°C
Peak output current
IPK TJ=25°C
Electrical characteristics (LM7906)
(TJ = 0 to 125 °C, VIN=11V, IO=500 mA, CI=2.2 µF, CO=1.0 µF, unless otherwise noted)
Characteristic
Symbol
Condition
Min
TJ=25°C
-5.75
Output voltage
VO 5.0mA ≤ IO ≤ 1.0A, PD≤15W -8.0V ≥ VIN ≥ -21.0V
-5.7
Line regulation (TJ=25°C)
Regline -8.0V ≥ VIN ≥ -25.0V
(Note 1)
-9.0V ≥ VIN ≥ -13.0V
Load regulation (TJ=25°C)
Regload 5.0 mA ≤ IO ≤ 1.5A
(Note 1)
250 mA ≤ IO ≤ 750 mA
Quiescent current
IQ
TJ=25°C
Quiescent current change
Δ IQ
5.0 mA ≤ IO ≤ 1.0 A -8.0V ≥ VIN ≥ -25.0V
Output Voltage Drift
ΔVO/ΔT IO = 5.0 mA
Output noise voltage
VN 10 Hz ≤ f ≤ 100 KHz, TA=25°C
Ripple rejection
RR -9.0V ≥ VIN ≥ -19.0V, f=120 Hz
54
Dropout voltage
VDROP IO = 1.0A, TJ=25°C
Short circuit current limit
ISC VIN = -35V, TA=25°C
Peak output current
IPK TJ=25°C
Typ -5.0 -5.0
-0.4 40 60 1.3 500 2.2
Typ -6.0 -6.0
-0.5 130 60 1.3 500 2.2
Max -5.2
-5.25
100 50 100 50 6.0 0.5 0.8
Unit
V
mV
mV mA mA mV/°C µV/VO dB V mA A
Max -6.25
-6.3
120 60 120 60 6.0 0.5 1.3
Unit
V
.