If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Input Supply (V
IN
)
SD/SS Pin Input Voltage (Note 2)
Output Pin Voltage
(3.3V, 5.0V and ADJ)
(12V and H-ADJ)
ADJ Pin Voltage (ADJ, H-ADJ only)
Power Dissipation
Storage Temperature Range
+45V
6V
−1V
≤
V
≤
9V
−1V
≤
V
≤
16V
−0.3V
≤
V
≤
25V
Internally Limited
−40˚C to +125˚C
ESD Susceptibility
Human Body Model (Note 3)
Lead Temperature (Soldering 10 sec.)
2 kV
260˚C
Operating Ratings
Ambient Temperature Range
Junction Temperature Range
Input Supply Voltage (3.3V version)
Input Supply Voltage (5V version)
Input Supply Voltage (12V version)
Input Supply Voltage (-ADJ, H-ADJ)
−40˚C
≤
T
A
≤
+85˚C
−40˚C
≤
T
J
≤
+125˚C
4.75V to 40V
7V to 40V
15V to 40V
4.5V to 40V
LM2825-3.3 Electrical Characteristics
Symbol
Parameter
(Note 4)
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Test Circuit
Figure 2.
Conditions
LM2825-3.3
Typical
(Note 6)
V
OUT
Output Voltage
4.75V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
1A
3.3
3.168/3.135
3.432/3.465
Line Regulation
Load Regulation
Output Ripple Voltage
η
Efficiency
4.75V
≤
V
IN
≤
40V
I
LOAD
= 100 mA
0.1A
≤
I
LOAD
≤
1A
V
IN
= 12V
V
IN
= 12V, I
LOAD
= 1A
V
IN
= 12V, I
LOAD
= 0.5A
1.5
8
40
75
Limit
(Note 7)
V
V(min)
V(max)
mV
mV
mV p-p
%
Units
(Limits)
LM2825-5.0 Electrical Characteristics
Symbol
Parameter
(Note 4)
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Test Circuit
Figure 2.
Conditions
LM2825-5.0
Typical
(Note 6)
V
OUT
Output Voltage
7V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
1A
5.0
4.800/4.750
5.200/5.250
Line Regulation
Load Regulation
Output Ripple Voltage
η
Efficiency
7V
≤
V
IN
≤
40V
I
LOAD
= 100 mA
0.1A
≤
I
LOAD
≤
1A
V
IN
= 12V
V
IN
= 12V, I
LOAD
= 1A
V
IN
= 12V, I
LOAD
= 0.5A
2.7
8
40
80
Limit
(Note 7)
V
V(min)
V(max)
mV
mV
mV p-p
%
Units
(Limits)
www.national.com
2
LM2825-12 Electrical Characteristics
Symbol
Parameter
(Note 4)
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Test Circuit
Figure 2.
Conditions
LM2825-12
Typical
(Note 6)
V
OUT
Output Voltage
15V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.75A
12.0
11.52/11.40
12.48/12.60
Line Regulation
Load Regulation
Output Ripple Voltage
η
Efficiency
15V
≤
V
IN
≤
40V
I
LOAD
= 100 mA
0.1A
≤
I
LOAD
≤
0.75A
V
IN
= 24V
V
IN
= 24V, I
LOAD
= 1A
V
IN
= 24V, I
LOAD
= 0.5A
8.5
12
100
87
Limit
(Note 7)
V
V(min)
V(max)
mV
mV
mV p-p
%
Units
(Limits)
LM2825-ADJ Electrical Characteristics
Symbol
Parameter
(Note 5)
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Test Circuit
Figure 3.
Conditions
LM2825-ADJ
Typical
(Note 6)
V
ADJ
Adjust Pin Voltage
4.5V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
1A
1.23V
≤
V
OUT
≤
8V
η
Efficiency
V
IN
= 12V, I
LOAD
= 0.5A
V
OUT
Programmed for 3V. See Circuit of
Figure 3
74
1.230
1.193/1.180
1.267/1.280
Limit
(Note 7)
V
V(min)
V(max)
%
Units
(Limits)
LM2825H-ADJ Electrical Characteristics
Symbol
Parameter
Conditions
(Note 5)
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Temperature
Range.
Test Circuit
Figure 3.
LM2825H-ADJ
Typical
(Note 6)
V
ADJ
Adjust Pin Voltage
9V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.55A
7V
≤
V
OUT
≤
15V
η
Efficiency
V
IN
= 24V, I
LOAD
= 0.5A
87
1.230
1.193/1.180
1.267/1.280
V
OUT
Programmed for 12V.
See Circuit of
Figure 3
Limit
(Note 7)
V
V(min)
V(max)
%
Units
(Limits)
3
www.national.com
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for T
A
= 25˚C, and those with
boldface type
apply over
full Operating Range.
Un-
less otherwise specified, V
IN
= 12V for 3.3V, 5.0V and ADJ versions, V
IN
= 24V for 12V and H-ADJ versions, I
LOAD
= 100 mA.
Symbol
Parameter
Conditions
LM2825-XX
Typical
(Note 6)
I
CL
DC Output Current
Limit
R
L
= 0Ω
1.4
1.2
2.4
I
Q
Operating Quiescent
Current
Standby Quiescent
Current
Adjust Pin Bias Current
Oscillator Frequency
Thermal Resistance
Shutdown Threshold
Voltage
Low (Shutdown Mode)
V
SS
I
SD
I
SS
Soft-start Voltage
Shutdown Current
Soft-start Current
High (Soft-start Mode)
V
OUT
= 20% of Nominal Output Voltage
V
OUT
= 100% of Nominal Output Voltage
V
SHUTDOWN
(Note 8)
V
SOFT-START
= 2.5V
(Note 8)
1.6
5
= 0.5V
2
3
5
10
µA
µA(max)
µA
µA(max)
SD/SS Pin = 3.1V
(Note 8)
SD/SS Pin = 0V
(Note 8)
I
ADJ
f
O
θ
JA
V
SD
Adjustable Versions Only, V
FB
= 1.3V
(Note 9)
Junction to Ambient (Note 10)
6
50/100
150
30
1.3
0.6
2.0
5
10
65
200
Limit
(Note 7)
A
A(min)
A(max)
mA
mA(max)
µA
µA(max)
nA
nA(max)
kHz
˚C/W
V
V(max)
V(min)
V
Units
(Limits)
I
STBY
SHUTDOWN/SOFT-START CONTROL
Test Circuit
Figure 2
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 5 mA.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 4:
When the LM2825 is used as shown in
Figure 2
test circuit, system performance will be as shown in Electrical Characteristics.
Note 5:
When the LM2825 is used as shown in
Figure 3
test circuit, system performance will be as shown in Electrical Characteristics.
Note 6:
Typical numbers are at 25˚C and represent the most likely norm.
Note 7:
All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face) when output current is limited to the value given
in the temperature derating curves. See the application section for curves. All limits at temperature extremes are guaranteed using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 8:
I
LOAD
= 0A.
Note 9:
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-
load.
Note 10:
Junction to ambient thermal resistance (no external heat sink) for the DIP-24 package with the leads soldered to a printed circuit board with (1 oz.) copper
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Analogue and Mixed Signal
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