參數(shù)資料
型號(hào)： LM2698
文件頁數(shù)： 4/17頁
文件大?。?/td> 503K
代理商： LM2698
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 1)
V
IN
SW Voltage
FB Voltage
V
C
Voltage
SHDN Voltage
(Note 2)
FSLCT
(Note 2)
Maximum Junction
Temperature
Power Dissipation (Note 3)
Lead Temperature
0.3V
≤
V
IN
≤
12V
0.3V
≤
V
SW
≤
18V
0.3V
≤
V
FB
≤
7V
0.965
<
V
C
<
1.565
0.3V
≤
V
SHDN
≤
7V
0.3V
≤
V
FSLCT
≤
12V
150C
Internally Limited
300C
Vapor Phase (60 sec.)
Infrared (15 sec.)
ESD Susceptibility
(Note 4)
Human Body Model
(Note 5)
Machine Model
215C
220C
2kV
200V
Operating Conditions
Operating Junction
Temperature Range
(Note 6)
Storage Temperature
Supply Voltage
SW Voltage
40C to +125C
65C to +150C
2.2V to 12V
0
≤
V
SW
≤
17.5V
Electrical Characteristics
Specifications in standard type face are for T
= 25C and those with
boldface type
apply over the full
Operating Tempera-
ture Range
( T
J
= 40C to +125C)Unless otherwise specified. V
IN
=2.2V and I
L
= 0A, unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 7)
1.3
5
1.26
1.9
0.013
Max
(Note 6)
2.0
10
1.2915
2.4
0.1
Units
I
Q
Quiescent Current
FB = 0V (Not Switching)
V
SHDN
= 0V
mA
μA
V
A
%/V
V
FB
I
CL
%V
FB
/
V
IN
Feedback Voltage
Switch Current Limit
Feedback Voltage Line
Regulation
FB Pin Bias Current
(Note 9)
Input Voltage Range
Error Amp Transconductance
I = 5μA
Error Amp Voltage Gain
Maximum Duty Cycle
Minimum Duty Cycle
1.2285
1.35
V
IN
= 2.7V (Note 8)
2.2V
≤
V
IN
≤
12.0V
I
B
0.5
20
nA
V
IN
g
m
A
V
D
MAX
D
MIN
2.2
40
12
290
V
135
120
85
15
30
600
1.25
0.01
0.5
0.01
0.2
0.6
0.6
2.05
1.95
μmho
V/V
%
%
FSLCT = Ground
FSLCT = Ground
FSLCT = V
IN
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
78
f
S
Switching Frequency
480
1
720
1.5
0.1
-1
3
0.4
0.9
kHz
MHz
μA
I
SHDN
Shutdown Pin Current
I
L
R
DS(ON)
TH
SHDN
Switch Leakage Current
Switch R
DS(ON)
SHDN Threshold Voltage
μA
V
V
V
V
0.3
1.95
1.85
UVP
On Threshold
Off Threshold
2.2
2.1
L
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