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參數(shù)資料
| 型號(hào)： | LM2645 |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 504K |
| 代理商： | LM2645 |
Absolute Maximum Ratings
(Notes 2, 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
IN, SW1, and SW2
FB1 and FB2
SD, ON/OFF1, ON/OFF2,
2NDFB/FPWM, SYNC, REF,
SS1, SS2, COMP1,
COMP2 and CSL1
LIN
CSH1, CSH2, and CSL2
Voltage from CBOOT1 to SW1
and from CBOOT2 to SW2
Voltage from HDRV1 to SW1
and from HDRV2 to SW2
0.3 to 31V
0.3 to 3V
0.3 to (V
LIN
+0.3)V
0.3 to 6V
0.3 to 7V
0.3 to 5V
0.3V
Voltage from CBOOT1 to
HDRV1 and from CBOOT2
HDRV2
Junction Temp.
Power Dissipation (Note 3)
Ambient Storage Temp. (T
J
)
Soldering Dwell Time, Temp. (Note 4)
Wave
Infrared
Vapor Phase
ESD Rating (Note 5)
0.3V
+150C
883 mW
65 to +150C
4 sec, 260C
10 sec, 240C
75 sec, 219C
2 kV
Operating Ratings
(Notes 1, 2)
V
IN
Junction Temp. (T
J
)
5.5 to 30V
0 to +125C
Electrical Characteristics
Typicals and limits appearing in regular type apply for T
= 25C. Limits appearing in
boldface
type apply over the entire junc-
tion temperature range for operation, 0 to +125C. Unless otherwise specified under the Parameter or Conditions columns, V
IN
= 10V, and V
SD
= V
ON/OFF1
= V
ON/OFF2
= 5V. (Note 2), (Note 6) and (Note 7)
Symbol
Parameter
Conditions
System
V
IN
Input Supply Voltage Range
Typical
Limit
Units
5.5
30
2.2
6.0
V(min)
V(max)
V(min)
V(max)
%
V
OUT
Output Voltage Adjustment
Range
V
OUT
/V
OUT
Load Regulation
0 mV
≤
(CSH1-CSL1)
≤
80 mV,
0 mV
≤
(CSH2-CSL2)
≤
80 mV
5.5V
≤
V
IN
≤
30V
ON (Note 8)
V
FB1
= V
FB2
= 1.4V,
V
CSH1
= 5.2V, V
CSL1
= 5V,
V
CSH2
= 3.5V, V
CSL2
= 3.3V
Standing By (Note 9)
V
ON/OFF1
= V
ON/OFF2
= 0V
Shut Down (Note 10)
V
SD
= 0V
V
SS1
= V
SS2
= 1V
0.5
V
OUT
/
V
IN
I
IN
Line Regulation
Input Supply Current
0.002
0.6
%/V
mA
1
mA(max)
80
μA
150
μA(max)
μA
μA(max)
μA
μA(min)
μA(max)
μA
mV
mV(min)
mV(max)
mV(min)
mV
mV(min)
mV(max)
25
60
I
SS1
, I
SS2
Soft-Start Source Current
4.75
2.0
7.0
Soft-Start Sink Current
Positive Current Limit Voltage
(Voltage from CSH1 to CSL1
and from CSH2 to CSL2)
10
100
V
PCL
80
140
75
40C
≤
T
J
≤
+125C
V
2NDFB/FPWM
= 0.8V
100
100
V
NCL
Negative Current Limit Voltage
(Voltage from CSH1 to CSL1
and from CSH2 to CSL2)
80
140
L
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