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參數(shù)資料
| 型號： | LM3224MMX-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 615kHz/1.25MHz Step-up PWM DC/DC Converter |
| 中文描述： | 2.8 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大小： | 920K |
| 代理商： | LM3224MMX-ADJ |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
SW Voltage
FB Voltage (Note 2)
V
C
Voltage (Note 3)
SHDN Voltage
FSLCT
Maximum Junction
Temperature
Power Dissipation(Note 4)
Lead Temperature
7.5V
21V
7V
1.26V
±
0.3V
7.5V
7.5V
150C
Internally Limited
300C
Vapor Phase (60 sec.)
Infrared (15 sec.)
ESD Susceptibility
(Note 5)
Human Body Model
Machine Model
215C
220C
2kV
200V
Operating Conditions
Operating Junction
Temperature Range (Note 6)
Storage Temperature
Supply Voltage
Maximum Output Voltage
40C to +125C
65C to +150C
2.7V to 7V
20V
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). V
IN
= 2.7V, FSLCT = SHDN = V
IN
, and I
L
= 0A, unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 7)
1.3
0.1
1.26
2.45
2.1
2.2
Max
(Note 6)
2.0
2.0
1.2915
Units
I
Q
Quiescent Current
FB = 2V (Not Switching)
V
SHDN
= 0V
mA
μA
V
V
FB
I
CL
(Note 8)
Feedback Voltage
Switch Current Limit
1.2285
V
IN
= 2.7V (Note 9)
V
IN
= 3V, V
OUT
= 8V
V
IN
= 3V, V
OUT
= 5V
2.7V
≤
V
IN
≤
7V
A
%V
FB
/
V
IN
Feedback Voltage Line
Regulation
FB Pin Bias Current (Note
10)
SS Pin Current
SS Pin Voltage
Input Voltage Range
Error Amp Transconductance
I = 5μA
Error Amp Voltage Gain
Maximum Duty Cycle
Switching Frequency
0.085
0.15
%/V
I
B
35
250
nA
I
SS
V
SS
V
IN
g
m
A
V
D
MAX
f
S
7.5
11
13
μA
1.2090
2.7
40
1.2430
1.2622
7
135
V
87
78
92.5
615
1.25
2.4
0.3
0.2
0.15
0.8
0.8
2.5
2.6
μmho
V/V
%
kHz
MHz
μA
85
450
0.9
FSLCT = Ground
FSLCT = V
IN
V
SHDN
= 2.7V
V
SHDN
= 0.3V
V
SW
= 20V
V
IN
= 2.7V, I
SW
= 1A
Output High
Output Low
750
1.5
5.0
1.2
8.0
0.4
I
SHDN
Shutdown Pin Current
I
L
R
DSON
Th
SHDN
Switch Leakage Current
Switch R
DSON
Shutdown Threshold
μA
V
V
V
V
1.2
0.3
UVP
On Threshold
Off Threshold
2.3
2.7
Note 1:
Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to
be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The FB pin should never exceed V
IN
.
Note 3:
Under normal operation the V
pin may go to voltages above this value. This maximum rating is for the possibility of a voltage being applied to the pin,
however the V
C
pin should never have a voltage directly applied to it.
Note 4:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
(MAX), the junction-to-ambient thermal resistance,
θ
JA
,
and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated using: P
D
(MAX) = (T
J(MAX)
T
A
)/
θ
JA
.
Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
L
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