Datasheet

LM2825
www.ti.com SNVS127C –MAY 1997–REVISED APRIL 2013
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.
Unless 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 Units
(Limits)
Typical
(1)
Limit
(2)
I
CL
DC Output Current Limit R
L
= 0Ω 1.4 A
1.2 A(min)
2.4 A(max)
I
Q
Operating Quiescent SD/SS Pin = 3.1V
(3)
5 mA
Current
10 mA(max)
I
STBY
Standby Quiescent SD/SS Pin = 0V
(3)
65 μA
Current
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 See
(4)
150 kHz
θ
JA
Thermal Resistance Junction to Ambient
(5)
30 °C/W
SHUTDOWN/SOFT-START CONTROL Test Circuit, see Figure 17
V
SD
Shutdown Threshold 1.3 V
Voltage
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
(3)
5 μA
10 μA(max)
I
SS
Soft-start Current V
SOFT-START
= 2.5V
(3)
1.6 μA
5 μA(max)
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured 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 Information section for curves. All limits at temperature
extremes are ensured using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing
Quality Level (AOQL).
(3) I
LOAD
= 0A.
(4) The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the
severity of current overload.
(5) Junction to ambient thermal resistance (no external heat sink) for the PDIP package with the leads soldered to a printed circuit board
with (1 oz.) copper area of approximately 2 in
2
.
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