Datasheet > CM3513

CM3513

更新时间： 2024-11-17 21:53:59

品牌	Logo	应用领域
CALMIRCO		开关
页数	文件大小	规格书
10页	143K
描述
USB 2.4A Overcurrent Switch

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中文翻译

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数据手册

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CM3513 数据手册

Preliminary

CM3513

CALIFORNIA MICRO DEVICES

USB 2.4A Overcurrent Switch

Features

Pin Diagram

•

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

GND

V_CC

V_OUT

TOP

10msec min fault blanking delay on OC# output

prevents false overcurrent alarms

V_OUT

OC#

•

Prevents backdrive current when host powered off

Low operating current (95µA typ.)

SOIC-8

V_CC

Low quiescent current when disabled (<1µA max)

Small 8-Lead SOIC package

EN#

Applications

•

Desktop PCs, Notebooks and Set-Top-Boxes

Product Description

Typical Application Circuit

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_BUSvoltage at the USB output ports

with minimal voltage drop. When the EN# pin is logic

low, the power switch is ON, and V_CCis connected to

the output V_OUT. When the EN# pin is logic high, the

power switch is OFF, and no power is available at

the output.

GND

V_OUT

OC#

V_BUS

V_CC

2 USB Ports

V_CC

V_BUS

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.

EN#

Simplified Electrical Schematic

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_MINthe switch then turns on again, and

the device heats up again, and so on, until the fault

is removed.

Charge

EN#

Pump

The CM3513 also prevents backdrive current

flowing into the host from the connected peripheral.

This can occur when V_CCis 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.

Over

OC#

V_OUT

current

V_CC

protect

C0970500

11/10/03

430 N. McCarthy Blvd, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

12 3 4 5 6 7...10

中文翻译

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