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參數(shù)資料
| 型號： | LM3485 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Hysteretic PFET Buck Controller |
| 中文描述： | 遲滯PFET的降壓控制器 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LM3485 |
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 1)
VIN Voltage
PGATE Voltage
FB Voltage
ISENSE Voltage
ADJ Voltage
Maximum Junction Temp.
Power Dissipation
0.3V to 36V
0.3V to 36V
0.3V to 5V
1.0V to 36V
0.3V to 36V
150C
417mW
@
T
A
=
25C
ESD Susceptibilty
Human Body Model (Note 3)
Lead Temperature
Vapor Phase (60 sec.)
Infared (15 sec.)
Storage Temperature
2kV
215C
220C
65C to 150C
Operating Ratings
(Note 1)
Supply Voltage
Operating Junction
Temperature
4.5V to 35V
40C to +125C
Electrical Characteristics
Specifications in Standard type face are for T
= 25C, and in
bold type face
apply over the full
Operating Temperature
Range
(T
= 40C to +125C). Unless otherwise specified, V
= 12V, V
= V
IN
1V, and V
ADJ
= V
IN
1.1V. Datasheet
min/max specification limits are guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
250
Max
(Note 4)
400
Unit
I
Q
Quiescent Current at
ground pin
Feedback Voltage
(Note 6)
Comparator
Hysteresis
Current limit
comparator trip
voltage
Current limit
comparator offset
Current limit ADJ
current source
Current limit one shot
off time
FB = 1.5V
(Not Switching)
μA
V
FB
1.226
1.217
1.242
1.258
1.267
15
20
V
V
HYST
10
14
110
mV
V
CL
(Note 7)
R
ADJ
= 20k
mV
R
ADJ
= 160k
880
V
CL_OFFSET
V
FB
= 1.5V
20
0
+20
mV
I
CL_ADJ
V
FB
= 1.5V
3.0
5.5
7.0
μA
T
CL
V
ADJ
= 11.5V
V
ISNS
= 11.0V
V
FB
= 1.0V
Source
I
SOURCE
= 100mA
Sink
I
Sink
= 100mA
Source
V
IN
= 7V,
P
GATE
= 3.5V
Sink
V
IN
= 7V,
P
GATE
= 3.5V
V
IN
= 4.5V
V
FB
= 1.0V
I
GATE
= 100μA sink
V
FB
= 1.0V
6
9
14
μs
R
PGATE
Driver resistance
5.5
8.5
I
PGATE
Driver Output current
0.44
A
0.32
V
PGATEMIN
Minimum driver
voltage
1.2
V
I
FB
FB pin Bias Current
(Note 8)
Minimum on time in
normal operation
300
750
nA
T
ONMIN_NOR
V
ISNS
= V
ADJ
+0.1V
C
load
on OUT =
1000pF
(Note 9)
100
ns
L
www.national.com
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