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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： | 5/11页 |
| 文件大小： | 198K |
| 代理商： | LM2639MX/NOPB |
Electrical Characteristics (Continued)
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
V
OCC_CM
Over-current Comparator
Common Mode Range
312
V
IB_OC+
OC+ Input Bias Current
V
IN = 5V, OC+ = 5V, OC =
4V
100
145
200
A
IB_OC
OC Input Bias Current
V
IN = 5V, OC+ = 6V, OC =
5V
85
125
165
A
V
OS_OCC
Over-current Comparator Input
Offset Voltage
V
IN = 5V
2
16
42
mV
V
IN = 12V
21
D
MAX
Maximun Duty Cycle
FB = 0V
78
%
gm
Error Amplifier
Transconductance
1.36
mmho
V
ramp
Ramp Signal Peak-to-Peak
Amplitude
2V
I
comp
COMP Pin Source Current
250
400
550
A
I
comp
COMP Pin Sink Current
160
280
400
A
V
comp_hi
COMP Pin High Clamp
2.9
V
comp_lo
COMP Pin Low Clamp
0.19
V
POR
Power On Reset Trip Point
Vcc5V Pin Voltage Rising
4.0
V
Vcc5V Pin Voltage Falling
3.6
Vcc12V Minimum Working
Voltage
(Note 7)
3.8
V
t
SS
Soft Start Delay
F
OSC = 8MHz
1.6
ms
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings do not imply guaranteed performance limits.
Note 2: Maximum allowable power dissipation is a function of the maximum junction temperature, TJMAX, the junction-to-ambient thermal resistance, θJA, and the
ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PMAX = (TJMAX TA)/θJA. The
junction-to-ambient thermal resistance,
θJA, for LM2639 is 78C/W. For a TJMAX of 150C and TA of 25C, the maximum allowable power dissipation is 1.6W.
Note 3: The letter
N stands for the typical output voltages appearing in italic boldface type in Table 1.
Note 4: Max value of logic low means any voltage below this value is guaranteed to be taken as logic low whereas a voltage higher than this value is not guaranteed
to be taken as a logic low.
Note 5: Min value of logic high means any voltage above this value is guaranteed to be taken as logic high whereas a voltage lower than this value is not guaranteed
to be taken as a logic high.
Note 6: When driving bipolar FET drivers in the typical application circuit.
Note 7: When Vcc12V pin goes below this voltage, all DRV pins go to 0V.
Note 8: ESD ratings for pins DRV0, DRV1, DRV2 and DRV3 is 1kV. ESD rating for all other pins is 2kV.
LM2639
www.national.com
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