Datasheet > CM3503

CM3503

更新时间： 2024-11-17 23:14:31

品牌	Logo	应用领域
CALMIRCO		开关
页数	文件大小	规格书
6页	218K
描述
USB 5V Single 1.4A Overcurrent Switch

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中文翻译

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数据手册

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CM3503 数据手册

PRELIMINARY

CM3503

CALIFORNIA MICRO DEVICES

USB 5V Single 1.4A Overcurrent Switch

Features

Pin Diagram

•

High-side high current switch with active low Enable

Very low on-resistance switch (0.07? typ.)

Up to 1.4A continuous current on the output

Over-current limits at 1.4A min

10msec min fault blanking delay on OC# output

prevents false overcurrent alarms

GND

V_CC

V_OUT

OC#

•

Prevents backdrive current when host powered off

Low operating current (95µA typ.)

Low quiescent current when disabled (<1µA max)

Small 8-Lead SOIC package

V_CC

EN#

Applications

SOIC-8

•

2 USB ports 5V supply overcurrent protection

Product Description

Typical Application Circuit

California Micro Devices’ CM3503 is a USB

overcurrent power switch that provides power to two

USB ports. The device has a very low on-resistance

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

1 USB Port

V_CC

V_BUS

EN#

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.

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.

EN#

V_CC

Over

current

protect

V_OUT

OC#

The CM3503 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.

C0970500

09/10/03

430 N. McCarthy Blvd, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

12 3 4 5 6

中文翻译

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与CM3503相关器件

型号	品牌	获取价格	描述	数据表
CM3503-02SN	CALMIRCO	获取价格	USB 5V Single 1.4A Overcurrent Switch
CM3504	PANJIT	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS(VOLTAGE - 50 to 800 Volts CURRENT - 10 to 35 Ampere
CM3504	TRSYS	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS
CM3-504	VCC	获取价格	Wedge Base
CM3-505	VCC	获取价格	Wedge Base
CM3506	PANJIT	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS(VOLTAGE - 50 to 800 Volts CURRENT - 10 to 35 Ampere
CM3506	TRSYS	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS
CM3-507	VCC	获取价格	Wedge Base
CM3508	PANJIT	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS(VOLTAGE - 50 to 800 Volts CURRENT - 10 to 35 Ampere
CM3508	TRSYS	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS

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