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參數(shù)資料
| 型號： | LM2651 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大小： | 215K |
| 代理商： | LM2651 |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(All voltages are referenced to the PGND and GND pins.)
DC Voltage at PV
IN
and V
IN
DC Voltage at SD, SLEEP LOGIC
and SYNC
DC current into SW
Junction Temperature
DC Power Dissipation (Note 2)
Storage Temperature
20V
15V
±
7.5A
Limited by the IC
1.28W
65C to +150C
Soldering Time, Temperature (Note
3)
Wave (4 seconds)
Infrared (10 seconds)
Vapor Phase (75 seconds)
ESD Susceptibility (Note 4)
260C
240C
219C
1.3 kV
Operating Ratings
(Note 1)
Supply Voltage Range (PV
IN
and
V
IN
)
Junction Temperature Range
4.5V to 18V
40C to +125C
Electrical Characteristics
V
= 15V, V
SLEEP LOGIC
= 0V and V
SD
= 0V unless superseded under
Conditions
. Typicals and limits appearing in plain
type apply for T
J
boldface
type apply over the full junction temperature range shown under
Operating Ratings
.
Symbol
Parameter
Conditions
V
OUT
Output Voltage
R1 = 75 k
, 1%,
R2 = 25 k
, 1%,
7.5V
≤
V
PVIN
≤
18V
0.12A
≤
I
LOAD
≤
3A
η
1
System Efficiency
I
LOAD
= 1A, T
A
= 25C,
F
OSC
Not Adjusted
η
2
System Efficiency
I
LOAD
= 3A, T
A
= 25C,
F
OSC
Not Adjusted
V
REF
Reference Voltage
V
SLEEPLOGIC
= 3V (Note 7)
Typ
(Note 5)
5.00
Limit
(Note 6)
Units
V
V(min)
V(max)
4.80/
4.75
5.20/
5.25
94
%
89
%
1.25
1.281/
1.294
1.219/
1.206
V(min)
V(max)
mA
mA(max)
μA
mA(max)
μA
μA(max)
m
m
(max)
I
Q
Quiescent Current in PWM
mode
Quiescent Current in Sleep
mode
Quiescent Current in Shutdown
mode
DC On-Resistance
Drain-to-Source of the
High-Side Power Switch
V
FB
= V
REF
20mV (Note 8)
IV
FB
= V
REF
20mV,
V
SLEEPLOGIC
= 3V (Note 8)
V
SD
= 3V
(Note 8)
I
DS
= 1A,
V
SLEEPLOGIC
= 3V,
V
FB
= 3V,
V
BOOT
= 24V
I
DS
= 1A,
V
FB
= 3V
4.0
6.50/
7.0
I
QS
850
1.35/
1.60
I
QSD
9
20/
25
R
DS(on)
HS
130
170/
245
R
DS(on)
LS
DC On-Resistance
Drain-to-Source of the
Low-Side Power Switch
Leakage current of the
High-Side Power Switch
Leakage current of the
Low-Side Power Switch
Active Current Limit of the
High-Side Power Switch
125
175/
245
m
m
(max)
I
L HS
V
PVIN
= 18V, V
SW
= 0V,
V
SD
= 3V
V
PVIN
= 18V, V
SW
= 18V,
V
SD
= 3V
V
PVIN
= 15V,
V
BOOT
= 24V,
V
FB
= 3V,
V
SLEEPLOGIC
= 3V,
V
FB
= V
REF
20 mV
100
10
nA
μA(max)
μA
μA(max)
A
A(min)
A(max)
I
L LS
95
210
I
LIMIT
5.5
3.5
7.5
F
OSC
Oscillator Frequency
90
80/
75
100/
105
kHz
kHz(min)
kHz(max)
kHz
kHz(min)
kHz(max)
%
%(min)
F
MAX
Maximum Oscillator Frequency
I
FREQ ADJ
= 100μA,(Note 9)
V
FB
= V
REF
20 mV
315
270/
260
360/
370
D
MAX
Maximum Duty Cycle
V
FB
= V
REF
20 mV,
F
OSC
Not Adjusted
97
94/
93
L
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