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參數(shù)資料
| 型號(hào)： | MIC2525-1BN |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | USB Power Control Switch Not Recommended for New Designs |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 93K |
| 代理商： | MIC2525-1BN |
January 2000
9
MIC2525
MIC2525
Applications Information
Supply Filtering
A 0.1
μ
F to 1
μ
F bypass capacitor from IN to GND, located at
the device, is strongly recommended to control supply tran-
sients. Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply lead induc-
tance) to damage internal control circuitry.
Input or output transients must not exceed the absolute
maximum supply voltage (V
IN max
= 6V) even for a short
duration.
Micrel
MIC2525
EN
OUT
FLG
GND
OUT
NC
NC
IN
1
8
2
7
3
6
4
5
0.1μF to 1μF
3V to 5.5V
Figure 1. Supply Bypassing
Enable Input
EN must be driven logic high or logic low for a clearly defined
input. Floating the input may cause unpredictable operation.
EN should not be allowed to go negative with respect to GND.
Soft Start
The MIC2525 presents a high impedance when off, and
slowly becomes a low impedance as it turns on. This reduces
inrush current and related voltage drop that results from
charging a capacitive load, satisfying the USB voltage droop
requirements for bus-powered applications as shown in
Figure 2.
The soft start circuit shown in Figure 3 can be utilized to meet
USB transient regulation specifications with large load ca-
pacitances (C
BULK
> 10uF). The MIC2525 will provide inrush
current limiting for these applications.
Transient Overcurrent Filter
When the MIC2525 is enabled, large values of capacitance
at the output of the device will cause inrush current to exceed
the short circuit current-limit threshold of the device and
assert the flag. The duration of this time will depend on the
size of the output capacitance. Refer to the
“
Functional
Characteristics
”
turn-on and turnoff behaviors for details.
MIC2525-xBM
EN
OUT
FLG
GND
OUT
NC
IN
1
8
2
7
3
6
5
0.1μF
Capacitive
Load
USB
Controller
NC
4
Bus Powered Hub
Downstream USB Device
Cable
Cable
USB Host
V
BUS
GND
μF
C
BULK
Figure 2. Soft-Start Application
MIC2525-2
EN
OUT
FLG
GND
OUT
NC
IN
1
8
2
7
3
6
5
USB
Controller
NC
4
USB Peripheral
Cable
USB Hub
C
BULK
GND
V
BUS
4.7
μF
USB
Function
Figure 3. Inrush Current-Limit Application
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2525-2BM | USB Power Control Switch Not Recommended for New Designs |
| MIC2525-2BN | USB Power Control Switch Not Recommended for New Designs |
| MIC2529-1BM | CONNECTOR ACCESSORY |
| MIC2529-2BM | Single-Channel USB Power Controller Advance Information |
| MIC2529 | Single-Channel USB Power Controller Advance Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2525-2BM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2526-1BM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2526-1BM T&R | 制造商:Micrel Inc 功能描述:DUAL-CHANNEL POWER DISTRIBUTION SWITCH |
| MIC2526-2BM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2526-2BM T&R | 制造商:Micrel Inc 功能描述:DUAL-CHANNEL POWER DISTRIBUTION SWITCH |
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