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参数资料
| 型号： | LM2639MX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 8700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | PLASTIC, SOIC-24 |
| 文件页数： | 4/11页 |
| 文件大小： | 198K |
| 代理商： | LM2639MX/NOPB |
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
CC5V
7V
V
CC12V
20V
Junction Temperature
125C
Power Dissipation (Note 2)
1.6W
Storage Temperature
65C to +150C
ESD Susceptibility (Note 8)
2 kV
Soldering Time, Temperature
10 sec., 300C
Operating Ratings (Note 1)
V
CC
4.75V to 5.25V
Junction Temperature Range
0C to 70C
Electrical Characteristics
V
CC5V = 5V, VCC12V = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ = +25C.
Limits appearing in boldface type apply over the entire operating temperature range.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Vcc5V
V
CC5V Pin Voltage
4.5
5.0
5.5
V
Vcc12V
V
CC12V Pin Voltage
10.0
12.0
18.0
V
DACOUT
5-bit DAC Output Voltage
(Note 3)
N1%
NN+1%
V
N1.5%
NN+1.5%
I
CC12V
Quiescent V
CC12V Current
Enable = 5V, VID = 00001,
DRV Outputs Floating
1.3
3
mA
I
CC5V
Operating V
CC5V Current
V
OUT = 2.00V
4.3
8
mA
V
REF
Rref Pin Voltage
1.225
V
INL
Vid0:4, Clksel, Divsel, and
Enable Pins Logic Threshold
Logic Low (Note 4)
1.8
1.5
V
INH
Logic High (Note 5)
3.5
2.8
V
I
INL
Vid0:4 and Enable Pins Internal
Pullup Current
The Corresponding Pin = 0V
60
100
140
A
Clksel, Divsel Pins Internal
Pullup Current
10
0
10
Gate Driver Resistance When
Sinking Current
I
SINK = 50 A, VCC12V = 14V
12
V
DRV
DRV0:3 Output Voltage
I
DRV = 10 mA, VCC12V = 14V,
OutV = 12V or 5V
OutV
0.3V
OutV
OutV +
0. 3V
V
t
fall
DRV0:3 Fall Time
(Note 6)
7
ns
I
SRC
DRV0:3 Source Current
DRV0:3 = 0V, V
CC12V = 14V,
OutV = 5V
40
60
mA
I
SINK
DRV0:3 Sink Current
DRV0:3 = 5V, V
CC12V = 14V,
OutV = 5V
90
160
250
mA
B
gOUT Voltage
Current Limit Not Activated
4
V
Current Limit Activated
0
I
FB
FB Pin Bias Current
FB = 2V
30
nA
B
gOUT Sink Current
B
gOUT = 1V
1.0
2.4
5
mA
F
OSC
Oscillator Frequency
8.02k
from Rref Pin to
Ground
7.0
8.0
8.7
MHz
D
DRV0:3 Duty Cycle Match
Duty Cycle = 50%
1
+1
%
ph
DRV0:3 Phase Accuracy
Duty Cycle = 50%,F
clock = 8
MHz
1
+1
Deg
T
off
PWM Off time
Divide by 4
22
%
T
off
Divide by 3
22
OutV
Drive Voltage Range
Output Freq.= 2MHz, V
O =
2.00V
0
12
Vcc12
V
LM2639
www.national.com
2
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