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LM2825N-5.0 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2825N-5.0
Descripción Electrónicos  Integrated Power Supply 1A DC-DC Converter
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2825N-5.0 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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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, VIN = 24V for 12V and H-ADJ versions, ILOAD = 100 mA.
Symbol
Parameter
Conditions
LM2825-XX
Units
(Limits)
Typical
Limit
(Note 6)
(Note 7)
I
CL
DC Output Current
Limit
R
L = 0Ω
1.4
A
1.2
A(min)
2.4
A(max)
I
Q
Operating Quiescent
Current
SD/SS Pin = 3.1V
5
mA
(Note 8)
10
mA(max)
I
STBY
Standby Quiescent
Current
SD/SS Pin = 0V
65
µA
(Note 8)
200
µA(max)
I
ADJ
Adjust Pin Bias Current
Adjustable Versions Only, V
FB = 1.3V
6
nA
50/100
nA(max)
f
O
Oscillator Frequency
(Note 9)
150
kHz
θ
JA
Thermal Resistance
Junction to Ambient (Note 10)
30
˚C/W
SHUTDOWN/SOFT-START CONTROL Test Circuit
Figure 2
V
SD
Shutdown Threshold
Voltage
1.3
V
Low (Shutdown Mode)
0.6
V(max)
High (Soft-start Mode)
2.0
V(min)
V
SS
Soft-start Voltage
V
OUT = 20% of Nominal Output Voltage
2
V
V
OUT = 100% of Nominal Output Voltage
3
I
SD
Shutdown Current
V
SHUTDOWN = 0.5V
5µA
(Note 8)
10
µA(max)
I
SS
Soft-start Current
V
SOFT-START = 2.5V
1.6
µA
(Note 8)
5
µA(max)
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: ILOAD = 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
area of approximately 2 in2.
www.national.com
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