LM2622
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
SW Voltage
FB Voltage
V
C
Voltage
SHDN Voltage
FSLCT
Maximum Junction
Temperature
Power Dissipation(Note 2)
Lead Temperature
12V
18V
7V
7V
7V
12V
150˚C
Internally Limited
300˚C
Vapor Phase (60 sec.)
Infrared (15 sec.)
ESD Susceptibility
Human Body Model
Machine Model
215˚C
220˚C
2kV
200V
Operating Conditions
Operating Junction
Temperature Range (Note 4)
Storage Temperature
Supply Voltage
−40˚C to +125˚C
−65˚C to +150˚C
2V to 12V
Electrical Characteristics
Specifications in standard type face are for T
J
= 25˚C and those with
boldface type
apply over the full
Operating Tempera-
ture Range
( T
J
= −40˚C to +125˚C)Unless otherwise specified. V
IN
=2.0V and I
L
= 0A, unless otherwise specified.
Symbol
I
Q
V
FB
I
CL
∆V
O
/∆I
LOAD
%V
FB
/∆V
IN
I
B
V
IN
g
m
A
V
D
MAX
f
S
I
SHDN
I
L
R
DSON
Th
SHDN
UVP
θ
JA
Parameter
Quiescent Current
Feedback Voltage
Switch Current Limit
Load Regulation
Feedback Voltage Line
Regulation
FB Pin Bias Current (Note 8)
Input Voltage Range
Error Amp Transconductance
∆I
= 5µA
Error Amp Voltage Gain
Maximum Duty Cycle
Switching Frequency
Shutdown Pin Current
Switch Leakage Current
Switch R
DSON
SHDN Threshold
On Threshold
Off Threshold
Thermal Resistance
Junction to Ambient(Note 9)
Junction to Ambient(Note 10)
Junction to Ambient(Note 11)
Junction to Ambient(Note 12)
Junction to Ambient(Note 13)
FSLCT = Ground
FSLCT = V
IN
V
SHDN
= V
IN
V
SHDN
= 0V
V
SW
= 18V
V
IN
= 2.7V, I
SW
= 1A
Output High
Output Low
1.8
1.7
0.9
78
480
1
2
40
135
135
85
600
1.25
0.01
−0.5
0.01
0.2
0.6
0.6
1.92
1.82
235
225
220
200
195
0.3
2.0
1.9
720
1.5
0.1
-1
3
0.4
µA
Ω
V
V
V
V
˚C/W
V
IN
= 2.7V (Note 7)
V
IN
= 3.3V
2.0V
≤
V
IN
≤
12.0V
Conditions
FB = 0V (Not Switching)
V
SHDN
= 0V
1.2285
1.0
Min
Typ
1.3
5
1.26
1.65
6.7
0.013
0.5
0.1
20
12
290
Max
2.0
10
1.2915
2.3
Units
mA
µA
V
A
mV/A
%/V
nA
V
µmho
V/V
%
kHz
MHz
µA
Note 1:
Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to
be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(MAX), the junction-to-ambient thermal resistance,
θ
JA
,
and the ambient temperature, T
A
. See the Electrical Characteristics table for the thermal resistance of various layouts. The maximum allowable power dissipation
at any ambient temperature is calculated using: P
D
(MAX) = (T
J(MAX)
− T
A
)/θ
JA
. Exceeding the maximum allowable power dissipation will cause excessive die
temperature, and the regulator will go into thermal shutdown.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin.
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