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參數(shù)資料
| 型號(hào)： | CM3513 |
| 廠商： | California Micro Devices Corporation |
| 英文描述： | USB 2.4A Overcurrent Switch |
| 中文描述： | 過流開關(guān)的USB 2.4? |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大小： | 141K |
| 代理商： | CM3513 |
CALIFORNIA MICRO DEVICES
Preliminary
CM3513
2003 California Micro Devices Corp. All rights reserved.
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
C0970500
1
USB 2.4A Overcurrent Switch
Features
High-side high current switch with active low Enable
Up to 2.4A continuous current on the output
Over-current limits at 2.4A min
10msec min fault blanking delay on OC# output
prevents false overcurrent alarms
Prevents backdrive current when host powered off
Low operating current (95
μ
A typ.)
Low quiescent current when disabled (<1
μ
A max)
Small 8-Lead SOIC package
Applications
Desktop PCs, Notebooks and Set-Top-Boxes
Pin Diagram
GND
Product Description
California Micro Devices’ CM3513 is a USB
overcurrent power switch that provides power to four
USB ports. The device has a power switch that
provides the V
voltage at the USB output ports
with minimal voltage drop. When the EN# pin is logic
low, the power switch is ON, and V
CC
is connected to
the output V
. When the EN# pin is logic high, the
power switch is OFF, and no power is available at
the output.
The power switch has full over-current protection.
Whenever the current limit of the switch is
exceeded, the device enters a constant-current
mode, where the output voltage is progressively
reduced to prevent the current from increasing
further. The OC# output becomes active low only if
the overcurrent condition exceeds at least 10ms.
This fault blanking delay prevents false alarms from
being reported to the host USB controller.
If the overcurrent condition is severe enough that
the part heats up to the thermal limit T
MAX
, then the
switch will be turned off and the temperature cools
down. At T
the switch then turns on again, and
the device heats up again, and so on, until the fault
is removed.
The CM3513 also prevents backdrive current
flowing into the host from the connected peripheral.
This can occur when V
CC
is removed as the host
powers down, and the peripheral still has normal
power applied. The 5V from the peripheral can
therefore be linked to the host’s V
BUS
, potentially
causing backdrive current into the host and
overloading the peripheral power supply.
Typical Application Circuit
Simplified Electrical Schematic
V
OUT
V
OUT
OC#
V
OUT
V
CC
EN#
V
CC
SOIC-8
TOP
2 USB Ports
V
BUS
V
BUS
2 USB Ports
V
CC
EN#
GND
V
CC
V
OUT
V
OUT
OC#
V
OUT
V
CC
EN#
OC#
V
OUT
V
CC
Over
current
protect
Charge
Pump
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|---|---|
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