Datasheet > CM3501

CM3501

更新时间： 2024-11-06 04:12:23

品牌	Logo	应用领域
CALMIRCO		开关
页数	文件大小	规格书
7页	226K
描述
Dual USB Overcurrent Switch 750mA (VCC) / 100mA (VSBY)

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中文翻译

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数据手册

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CM3501 数据手册

PRELIMINARY

CM3501

CALIFORNIA MICRO DEVICES

Dual USB Overcurrent Switch 750mA (V_CC) / 100mA (V_SBY)

The CM3501 also prevents backdrive current

Features

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.

•

Dual outputs, each with independent over-current

protection circuitry and indicator

•

Supports standby mode in PCs so that a peripheral

can ramp down safely to a current <100mA

Low ON-resistance switches

•

Up to 750mA (V_CC) / 100mA (V_SBY) continuous

current on each output

•

Over-current limits at 750mA / 100mA respectively

10msec min fault blanking delay on OC# outputs

prevents false overcurrent alarms

Prevents backdrive current when host powered off

Low operating current (95µA typ.)

Low quiescent current when disabled (<1µA max)

Small 8-Lead SOIC package

Pin Diagram

OC1#

V_OUT1

V_OUT2

OC2#

GND

•

V_CC

V_SBY

Applications

SEL

•

PC motherboards with USB ports (i.e., can use a

CM3501 for 2 ports or 2 CM3501s for 4 ports, etc)

SOIC-8

Typical Application Circuit

Product Description

California Micro Devices’ CM3501 is a dual port

USB overcurrent power switch that selects between

two independent 5V inputs available on a PC,

depending on the state of a logic input (SEL). The

device has two pairs of power switches, and each

pair is an analog “OR” function, providing a

continuous voltage at both outputs during power

transfer beween inputs.

GND

V_CC

OC1#

V_OUT1

V_OUT2

OC2#

V_BUS

1 USB Port

5V V_CC

5V V_SBY

V_SBY

SEL

V_BUS

V_CCis the main 5V supply, which can be disabled in

a PC, and V_SBYis the 5V standby supply which is

powered up whenever the PC has power. When the

‘SEL’ pin is at logic high, V_CCis the assigned input

power supply. When ‘SEL’ is at logic low, V_SBYis

used to power the output, and no current is taken

from V_CC. Both switches can be deselected and

switched off by not driving (floating) the ‘SEL’ input,

which places the chip in low power mode.

Select V_CC

Simplified Electrical Schematic

Both pairs of switches have over-current protection.

Depending on whether ‘SEL’ is high or low, a current

over 750mA or 100mA respectively out of either

output causes the device to enter a constant-current

mode, where the output voltage is progressively

reduced to prevent the current from increasing

further. Each output is independent of the other, so if

one of the switches is switched on but is not in

overcurrent mode then it will remain switched on.

The OC# output becomes active only if the

750mA

Over

current

OC1#

V_OUT1

V_CC

SEL

100mA

Over

current

V_SBY

750mA

Over

current

OC2#

V_OUT2

overcurrent condition exceeds

continuous duration of 10ms.

If the overcurrent condition is severe enough that

minimum

the part heats up to the thermal limit T_MAX, the switch

100mA

Over

current

turns off and the temperature cools down to T_MIN

The switch then turns on again, and the device

heats up again, and so on, until the fault is removed.

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 7

中文翻译

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与CM3501相关器件

型号	品牌	获取价格	描述	数据表
CM3-501	VCC	获取价格	Wedge Base
CM3501-02SN	CALMIRCO	获取价格	Dual USB Overcurrent Switch 750mA (VCC) / 100mA (VSBY)
CM3502	PANJIT	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS(VOLTAGE - 50 to 800 Volts CURRENT - 10 to 35 Ampere
CM3502	TRSYS	获取价格	HIGH CURRENT SILICON BRIDGE RECTIFIERS
CM3503	CALMIRCO	获取价格	USB 5V Single 1.4A Overcurrent Switch
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

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