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參數(shù)資料
| 型號： | LM3211 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Step-up PWM DC/DC Converter Integrated with 4 Buffers |
| 中文描述： | 升壓PWM直流/直流轉(zhuǎn)換器集成有4緩沖器 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 821K |
| 代理商： | LM3211 |
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
V
SW
Voltage
FB Voltage
V
C
Voltage
SHDN Voltage
FSLCT Voltage
Supply Voltage, Vs+
Buffer Input Voltage
Buffer Output Voltage
-0.3V to 7.5V
-0.3V to 18V
-0.3V to 7V
0.965V to 1.565V
-0.3V to V
IN
AGND to V
IN
-0.3V to 14V
Rail-to-Rail
Rail-to-Rail
ESD Ratings
(Note 3)
Human Body Model
Machine Model
2kV
150V
Operating Conditions
Operating Temperature
Storage Temperature
Supply Voltage, V
IN
V
SW
Voltage
Supply Gamma Buffer, Vs+
40C to +125C
65C to +150C
2.2V to 7.5V
17V
4V to 14V
Electrical Characteristics
Specifications in standard type face are for T
J
= 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 Vs+ = 8V.
Switching Regulator
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
1.6
1.65
2.5
3.4
6
1.265
Max
(Note 4)
2
2.2
3
4
15
1.291
Units
I
Q
Quiescent Current
Not Switching, FSCLT = 0V
Not Switching, FSCLT = V
IN
Switching, FSCLT = 0V
Switching, FSCLT = V
IN
Shutdown mode
mA
μA
V
V
FB
%V
FB
/
V
IN
Feedback Voltage
Feedback Voltage Line
Regulation
Switch Current Limit
(Note 6)
Switch R
DSON
(Note 7)
FB Pin Bias Current(Note 8)
Input Voltage Range
Soft Start Current
Internal Soft Start Ramp
Time
Error Amp Transconductance
I = 5μA
Error Amp Voltage Gain
Maximum Duty Cycle
Switching Frequency
1.239
0.03
0.05
%/V
I
CL
V
IN
= 2.5V, V
OUT
= 8V
1.4
A
R
DSON
I
B
V
IN
I
SS
T
SS
V
IN
= 2.7V
170
30
m
nA
V
μA
90
7.5
15
2.2
5
11
FSLCT = 0V
6.7
12
mS
g
m
A
V
D
MAX
f
S
60
135
135
85
600
1.25
0.185
0.6
0.6
0.5
1.9
1.8
100
250
μmho
V/V
%
kHz
MHz
μA
V
V
μA
V
V
mV
78
500
0.9
FSLCT = 0V
FSLCT = V
IN
V
SW
= 17V
Output High
Output Low
0V
≤
SHDN
≤
V
IN
700
1.5
20
I
L
SHDN
Switch Leakage Current
SHDN Threshold
0.85
0.3
1
2
1.9
I
SHDN
UVP
Shutdown Pin Current
On Threshold
Off Threshold
Hysteresis
1.8
1.7
L
www.national.com
5
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