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參數(shù)資料
| 型號(hào)： | LM2678 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| 中文描述： | 高效率的SIMPLE SWITCHER第5A降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/27頁 |
| 文件大?。?/td> | 459K |
| 代理商： | LM2678 |
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All Output Voltage Versions
Electrical Characteristics
Limits appearing in
bold type face
apply over the entire junction temperature range of operation, 40C to 125C. Specifica-
tions appearing in normal type apply for T
A
= T
J
= 25C. Unless otherwise specified V
IN
=12V for the 3.3V, 5V and Adjustable
versions and V
IN
=24V for the 12V version.
Symbol
Parameter
Conditions
DEVICE PARAMETERS
I
Q
Quiescent
Current
V
FEEDBACK
= 8V
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V
For 12V Versions
I
STBY
Standby
Quiescent
Current
I
CL
Current Limit
I
L
Output Leakage
Current
V
SWITCH
= 0V
V
SWITCH
= 1V
R
DS(ON)
Switch
On-Resistance
f
O
Oscillator
Frequency
D
Duty Cycle
Maximum Duty Cycle
Minimum Duty Cycle
I
BIAS
Feedback Bias
Current
ADJ Version Only
V
ON/OFF
ON/OFF
Threshold
Voltage
I
ON/OFF
ON/OFF Input
Current
θ
JA
Thermal
Resistance
(Note 5)
θ
JA
T Package, Junction to Ambient
(Note 6)
θ
JC
T Package, Junction to Case
θ
JA
S Package, Junction to Ambient
(Note 7)
θ
JA
S Package, Junction to Ambient
(Note 8)
θ
JA
S Package, Junction to Ambient
(Note 9)
θ
JC
S Package, Junction to Case
θ
JA
SD Package, Junction to Ambient
(Note 10)
θ
JA
SD Package, Junction to Ambient
(Note 11)
Typ
Min
Max
Units
4.2
6
mA
ON/OFF Pin = 0V
50
100/
150
μA
7
6.1/
5.75
8.3/
8.75
A
V
IN
= 40V, ON/OFF Pin = 0V
16
0.12
200
15
μA
mA
I
SWITCH
= 5A
0.14/
0.225
Measured at Switch Pin
260
225
280
kHz
91
0
85
%
%
nA
V
FEEDBACK
= 1.3V
1.4
0.8
2.0
V
ON/OFF Input = 0V
20
45
μA
T Package, Junction to Ambient
65
45
2
56
C/W
35
26
2
55
++
C/W
29
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical
Characteristics tables.
Note 2:
ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 k
resistor into each pin.
Note 3:
Typical values are determined with T
A
= T
J
= 25C and represent the most likely norm.
L
www.national.com
4
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PDF描述 |
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| LM2679S-12 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679S-3.3 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679S-5.0 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679T-12 | 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 250 Ohm Resistance Value |
| LM2679T-3.3 | 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 2.5 kOhm Resistance Value |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2678_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-5.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
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