參數(shù)資料
型號(hào)： LM3351
廠商： National Semiconductor Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Switched Capacitor Voltage Converter
中文描述： 開(kāi)關(guān)電容電壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 2/8頁(yè)
文件大?。?/td> 265K
代理商： LM3351
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Input Voltage, Step-Down
Maximum Input Voltage, Step-Up
Power Dissipation (P
D
) (T
A
=25C,
(Note 2))
θ
ja
(Note 2)
Tj Max (Note 2)
5.5V
3.65V
500 mW
250C/W
150C
Storage Temperature
Lead Temperature (Soldering, 10
secs)
ESD Susceptibility (Note 3)
Not short circuit protected.
65C to +150C
260C
2kV
Operating Conditions
(Note 1)
Ambient Temperature Range
40C to + 85C
Electrical Characteristics
3/2 Step-Up Voltage Converter
Specifications in standard type face are for T
= 25C, and those with
boldface type
apply over
full operating temperature
range
. Unless otherwise specified, V
in
= 3.3V, V
Enable
= 3.3V, I
load
= 50 mA, C
1
, C
2
, C
in
and C
out
= 1 μF.
Symbol
Parameter
Conditions
V
out
NL
Output Voltage at
No Load
V
out
FL
Output Voltage at
50 mA
V
in
Input Supply
Voltage Range
Typ
(Note 4)
5.0
Limits
(Note 5)
Units
V
I
load
= 0 A
I
load
= 50 mA
4.7
V
3.3
V
2.5
3.65
V(Min)
V(Max)
μA
μA(Max)
mA
mA(Max)
(Max)
kHz
kHz(Min)
kHz(Max)
V
V(Min)
V(Max)
μA
μA(Max)
%
I
Q1
Quiescent Current
Shutdown Mode, V
Enable
= 0V,
I
load
=0 A; Current into pin V
low
0.025
3
I
Q2
Quiescent Current
Normal Mode, I
Ioad
= 0A; Current into
pin V
Iow
1.1
1.5
Z
out
Output Source
Impedance
I
load
= 50 mA
4.2
6.25
f
SW
Switching
Frequency
(Note 6)
200
125
275
V
Enable
Enable Threshold
Voltage
1.7
1.0
2.5
I
Enable
Leakage Current
Current into ENABLE pin; ENABLE =
5V and all other pins at ground
0.025
1
P
η
Power Efficiency
95
Electrical Characteristics
2/3 Step-Down Voltage Converter
Specifications in standard type face are for T
= 25C, and those with
boldface type
apply over
full operating temperature
range
. Unless otherwise specified, V
high
= 5V, V
Enable
= 5V, I
load
= 50 mA, C
1
, C
2
, C
in
and C
out
= 1 μF.
Symbol
Parameter
Conditions
V
out
NL
Output Voltage at
No Load
V
out
FL
Output Voltage at
50 mA
V
in
Input Supply
Voltage Range
Typ
(Note 4)
3.3
Limits
(Note 5)
Units
V
I
load
= 0 A
I
load
=50 mA
3.2
V
5
V
2.2
5.5
V(Min)
V(Max)
μA
μA(Max)
I
Q1
Quiescent Current
Shutdown Mode, V
Enable
= 0V,
I
load
=0 A; Current into pin V
high
0.25
3
L
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