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參數(shù)資料
| 型號(hào)： | LM3544 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Quad Port USB Power Distribution Switch and Over-Current Protection |
| 中文描述： | 四端口USB電源配電開(kāi)關(guān)和過(guò)電流保護(hù) |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大小： | 349K |
| 代理商： | LM3544 |
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AC Electrical Characteristics
Limits are for T
J
= 25C and V
IN
= 5.0V.
Symbol
Parameter
t
r
OUT
x
Rise Time (Note 5)
t
f
OUT
x
Fall Time (Note 6)
t
ON
Turn-on Delay (Note 7)
t
OFF
Turn-off Delay (Note 8)
t
F
Flag Delay (Note 9)
Conditions
Min
Typ
1.5
0.9
2.9
0.7
7
Max
Units
ms
ms
ms
ms
ms
C
L
= 33 μF, I
LOAD
= 500 mA
C
L
= 33 μF, I
LOAD
= 500 mA
C
L
= 33 μF, I
LOAD
= 500 mA
C
L
= 33 μF, I
LOAD
= 500 mA
I
FLAG
= 10 mA
Note 5:
Time for OUT
x
to rise from 10% to 90% of its enabled steady-state value after EN
x
(EN
x
) is asserted.
Note 6:
Time for OUT
x
to fall from 10% to 90% of its enabled steady-state value after EN
x
(EN
x
) is deasserted.
Note 7:
Time between EN
x
rising through V
IH
(EN
x
falling through V
IL
) and OUT
x
rising through 90% of its enabled steady-state voltage.
Note 8:
Time between EN
x
falling through V
IL
(EN
x
rising through V
IH
) and OUT
x
falling through 10% of its enabled steady-state voltage.
Note 9:
Time between EN
x
rising through V
IN
(EN
x
falling through V
IN
) and FLAG
X
falling through 0.3V when OUT
X
is connected to GND.
Pin Description
Pin Number
2, 6
Pin Name
IN 1, 2
Pin Function
Supply Inputs: These pins are the inputs to the power switches and the supply
input for the IC. In most applications they are connected together externally
and to a single input voltage supply.
Grounds: Must be connected together and to a common ground.
Switch Outputs: These pins are the outputs of the high side switches.
Enable (Inputs): Active-high (or active-low) logic enable inputs.
1, 5
GND 1, 2
OUT 1, 2, 3, 4
LM3544-H: EN 1, 2, 3, 4
(LM3544-L: EN 1, 2, 3, 4)
FLAG 1, 2, 3, 4
15, 14, 11, 10
3, 4, 7, 8
16, 13, 12, 9
Fault Flag (Outputs): Active-low open drain outputs. Indicates over-current,
UVLO or thermal shutdown. See
″
Application Information
″
section for more
details.
L
www.national.com
4
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