CM3501-02SN CALMIRCO [California Micro Devices Corp], CM3501-02SN Datasheet

CM3501-02SN

Manufacturer Part Number

CM3501-02SN

Description

Dual USB Overcurrent Switch 750mA (VCC) / 100mA (VSBY)

Manufacturer

CALMIRCO [California Micro Devices Corp]

Datasheet

1.CM3501-02SN.pdf (7 pages)

Current page: 1 of 7
Download datasheet (227Kb)

09/10/03

Features

Applications

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.

a PC, and V

powered up whenever the PC has power. When the

‘SEL’ pin is at logic high, V

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

used to power the output, and no current is taken

from V

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

which places the chip in low power mode.

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

overcurrent

continuous duration of 10ms.

If the overcurrent condition is severe enough that

the part heats up to the thermal limit T

turns off and the temperature cools down to T

The switch then turns on again, and the device

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

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

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

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 (95 A typ.)

Low quiescent current when disabled (<1 A max)

Small 8-Lead SOIC package

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

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

CALIFORNIA MICRO DEVICES

Dual USB Overcurrent Switch 750mA (V

430 N. McCarthy Blvd, Milpitas, California 95035

. Both switches can be deselected and

SBY

condition

is the 5V standby supply which is

) / 100mA (V

exceeds

is the assigned input

SBY

MAX

) continuous

, the switch

minimum

SBY

MIN

Tel: (408) 263-3214

SEL

Select V

Typical Application Circuit

Simplified Electrical Schematic

SBY

Pin Diagram

5V V

The CM3501 also prevents backdrive current

flowing into the host from the connected peripheral.

This can occur when V

powers down, and the peripheral still has normal

power applied. The 5V from the peripheral can

therefore be linked to the host’s V

causing backdrive current into the host and

overloading the peripheral power supply.

SBY

SEL

GND

SBY

Fax: (408) 263-7846

GND

SEL

SBY

) / 100mA (V

SOIC-8

OC1#

OC2#

OUT1

OUT2

is removed as the host

PRELIMINARY

www.calmicro.com

750mA

100mA

current

100mA

current

750mA

current

BUS

OC1#

OC2#

BUS

Over

OUT1

OUT2

SBY

BUS

, potentially

CM3501

)

1 USB Port

C0970500

OC2#

OC1#

OUT1

OUT2

Related parts for CM3501-02SN

CM3501-02SN Summary of contents

Page 1

... Low quiescent current when disabled (<1 A max) Small 8-Lead SOIC package Applications PC motherboards with USB ports (i.e., can use a CM3501 for 2 ports or 2 CM3501s for 4 ports, etc) 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) ...

Page 2

... 1mA Tel: (408) 263-3214 PRELIMINARY MIN TYP MAX 2.2 2.5 4 0.13 0. 1.4 750 100 10 20 150 125 0mA 95 = 0mA 1 = 0mA 0.8 0.4 Fax: (408) 263-7846 www.calmicro.com CM3501 UNIT ...

Page 3

... OUT1 1 CM3501-02SN Tel: (408) 263-3214 PRELIMINARY CM3501 , set SEL low to select CC /V levels are independent, active low open There is a built- OUT1 OUT2 input source. SBY input source. SBY Part Marking CM3501-02SN Fax: (408) 263-7846 www.calmicro.com 3 ...

Page 4

... OUT OUT Total powerdown when over-temperature limit reached OC# goes active after 10ms (min) 20ms (typ.) delay OC# stays low T = 150’C MAX Tel: (408) 263-3214 Fax: (408) 263-7846 PRELIMINARY CM3501 Re-powers when temperature drops to 125’C 150’ 125’C MIN www.calmicro.com 4 ...

Page 5

... CALIFORNIA MICRO DEVICES 120 110 100 4.2 CM3501 Vout-Iout characteristic (SEL=0V, Vsby active 0.1 © 2003 California Micro Devices Corp. All rights reserved 09/10/03 430 N. McCarthy Blvd, Milpitas, California 95035 Typical Operating Characteristics CM3501 I vs ...

Page 6

... CALIFORNIA MICRO DEVICES CM3501 Vout-Iout characteristic (SEL=5V, Vdd active 0 3.5 © 2003 California Micro Devices Corp. All rights reserved 09/10/03 430 N. McCarthy Blvd, Milpitas, California 95035 1 1 [A] OUT OC# Fault Blanking Delay 4 4.5 V [V] CC Tel: (408) 263-3214 ...

Page 7

... CALIFORNIA MICRO DEVICES © 2003 California Micro Devices Corp. All rights reserved 09/10/03 430 N. McCarthy Blvd, Milpitas, California 95035 SOIC-8 Package Dimensions Tel: (408) 263-3214 Fax: (408) 263-7846 PRELIMINARY CM3501 www.calmicro.com 7 ...

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