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CM3501 PDF预览

CM3501

更新时间: 2024-11-18 04:12:23
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7页 226K
描述
Dual USB Overcurrent Switch 750mA (VCC) / 100mA (VSBY)

CM3501 数据手册

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PRELIMINARY  
CM3501  
CALIFORNIA MICRO DEVICES  
Dual USB Overcurrent Switch 750mA (VCC) / 100mA (VSBY)  
The CM3501 also prevents backdrive current  
Features  
flowing into the host from the connected peripheral.  
This can occur when VCC 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 VBUS, 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 (VCC) / 100mA (VSBY) 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#  
VOUT1  
VOUT2  
OC2#  
GND  
VCC  
VSBY  
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  
VCC  
OC1#  
VOUT1  
VOUT2  
OC2#  
VBUS  
1 USB Port  
1 USB Port  
5V VCC  
5V VSBY  
VSBY  
SEL  
VBUS  
VCC is the main 5V supply, which can be disabled in  
a PC, and VSBY is the 5V standby supply which is  
powered up whenever the PC has power. When the  
‘SEL’ pin is at logic high, VCC is the assigned input  
power supply. When ‘SEL’ is at logic low, VSBY is  
used to power the output, and no current is taken  
from VCC. Both switches can be deselected and  
switched off by not driving (floating) the ‘SEL’ input,  
which places the chip in low power mode.  
Select VCC  
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#  
VOUT1  
VCC  
SEL  
100mA  
Over  
current  
VSBY  
750mA  
Over  
current  
OC2#  
VOUT2  
overcurrent condition exceeds  
continuous duration of 10ms.  
If the overcurrent condition is severe enough that  
a
minimum  
the part heats up to the thermal limit TMAX, the switch  
100mA  
Over  
current  
turns off and the temperature cools down to TMIN  
.
The switch then turns on again, and the device  
heats up again, and so on, until the fault is removed.  
© 2002 California Micro Devices Corp. All rights reserved.  
C0970500  
09/10/03  
430 N. McCarthy Blvd, Milpitas, California 95035  
Tel: (408) 263-3214  
Fax: (408) 263-7846  
www.calmicro.com  
1

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