L7900AC
SERIES
2% NEGATIVE VOLTAGE REGULATORS
s
s
s
s
s
OUTPUT CURRENT TO 1.5A
OUTPUT VOLTAGES OF -5; -6; -8; -12; -15;
-18; -20; -24V
THERMAL OVERLOAD PROTECTION
SHORT CIRCUIT PROTECTION
OUTPUT TRANSITION SOA PROTECTION
DESCRIPTION
The L7900AC series of three-terminal negative
regulators is available in TO-220 and D2PAK
packages and several fixed output voltages.
These regulators can provide local on-card
regulation, eliminating the distribution problems
associated
with
single
point
regulation;
furthermore, having the same voltage option as
the L7800A positive standard series, they are
particularly suited for split power supplies. If
adequate heat sinking is provided, they can
deliver over 1.5A output current.
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable voltages
and currents.
TO-220
D2PAK
SCHEMATIC DIAGRAM
June 2004
Rev. 7
1/13
L7900AC SERIES
Figure 2: Application Circuits
Table 4: Electrical Characteristics Of L7905A (refer to the test circuits, TJ = 0 to 125°C, VI = -10V,
IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
-4.9
-5
-5.1
V
-4.8
-5
-5.2
V
100
mV
VO
Output Voltage
TJ = 25°C
VO
Output Voltage
IO = -5 mA to -1 A
VI = 8 to 20 V
∆VO(*)
Line Regulation
VI = -7 to -25 V
TJ = 25°C
VI = -8 to -12 V
TJ = 25°C
50
∆VO(*)
Load Regulation
IO = 5 mA to 1.5 A
TJ = 25°C
100
IO = 250 to 750 mA
TJ = 25°C
50
Quiescent Current
TJ = 25°C
Quiescent Current Change
IO = 5 mA to 1 A
Id
∆Id
PO ≤ 15W
3
eN
mA
1.3
IO = 5 mA
-0.4
B = 10Hz to 100KHz
Supply Voltage Rejection
Vd
Dropout Voltage
IO = 1 A
mV
Isc
Short Circuit Current
Iscp
Short Circuit Peak Current
TJ = 25°C
TJ = 25°C
100
TJ = 25°C
∆VI = 10 V f = 120Hz
54
∆VO = 100
mV/°C
µV
60
dB
1.4
V
2.1
Output Noise Voltage
SVR
mA
0.5
VI = -8 to -25 V
∆VO/∆T Output Voltage Drift
mV
A
2.5
A
(*) 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 cycle is used.
3/13
