Dual Overcurrent Switch 750mA (VCC) 100mA (VSBY) Dual outputs, ea

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Dual Overcurrent Switch 750mA (VCC) 100mA (VSBY) Dual outputs, ea

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PRELIMINARY CM3501
Dual Overcurrent Switch 750mA (VCC) 100mA (VSBY)
Dual outputs, each with independent over-current protection circuitry indicator Supports standby mode that peripheral ramp down safely current <100mA ON-resistance switches 750mA (VCC) 100mA (VSBY) continuous current each output Over-current limits 750mA 100mA respectively 10msec fault blanking delay outputs prevents false overcurrent alarms Prevents backdrive current when host powered operating current (95µA typ.) quiescent current when disabled (<1µA max) Small 8-Lead SOIC package motherboards with ports (i.e., CM3501 ports CM3501s ports, etc) CM3501 also prevents backdrive current flowing into host from connected peripheral. This occur when removed host powers down, peripheral still normal power applied. from peripheral therefore linked host's VBUS, potentially causing backdrive current into host overloading peripheral power supply.
Diagram
VSBY SOIC-8 OC1# VOUT1 VOUT2 OC2#
Applications
Typical Application Circuit Product Description
California Micro Devices' CM3501 dual port overcurrent power switch that selects between independent inputs available depending state logic input (SEL). device pairs power switches, each pair analog "OR" function, providing continuous voltage both outputs during power transfer beween inputs. main supply, which disabled VSBY standby supply which powered whenever power. When `SEL' logic high, assigned input power supply. When `SEL' logic low, VSBY used power output, current taken from VCC. Both switches deselected switched driving (floating) `SEL' input, which places chip power mode. Both pairs switches have over-current protection. Depending whether `SEL' high low, current over 750mA 100mA respectively either output causes device enter constant-current mode, where output voltage progressively reduced prevent current from increasing further. Each output independent other, switches switched overcurrent mode then will remain switched output becomes active only overcurrent condition exceeds minimum continuous duration 10ms. overcurrent condition severe enough that part heats thermal limit TMAX, switch turns temperature cools down TMIN. switch then turns again, device heats again, until fault removed.
2002 California Micro Devices Corp. rights reserved.
VSBY Select VSBY
OC1# VOUT1 VOUT2 VBUS OC2# VBUS Port Port
Simplified Electrical Schematic
VSBY
750mA Over current 100mA Over current 750mA Over current 100mA Over current
OC1# VOUT1
OC2# VOUT2
C0970500
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Absolute Maximum Ratings Parameter Rating Protection (All pins, HBM) 2000 VCC, VSBY Input Voltage 5.6, Storage Temperature Range +150 Operating Ambient Operating Junction +150* Output Current Loading Internally limited Package Power Dissipation
Internally limited
PRELIMINARY CM3501
Unit
Operating Conditions (unless specified otherwise) Parameter Range VCC, VSBY Input Voltage Ambient Temperature ILOAD port VSBY
Unit
Symbol UVLO VOUT1, VOUT2 RSW1 RSW2 ILIM ILIM VSBY tFBD
TMAX TMIN
ISBY ISBY ISBY ISBY VIH-EN VIL-EN VOL-OC
Electrical Operating Characteristics (over operating conditions unless specified otherwise) Parameter Conditions VCC/VSBY voltage under which T=25°C circuit locks will operate Output Voltage ILOAD 500mA, 5.0V, 25°C Switch ON-Resistance ILOAD 750mA; 0.13 0.20 T=25°C VSBY Switch ON-Resistance ILOAD 100mA; VSBY 25°C over-current limit VSBY over-current limit VSBY Time delay from overcurrent detection output indication (fault blanking delay) Temperature which switch turns during overcurrent Temperature which cool switch turns after cooling from TMAX Reverse leakage from outputs VOUT floating VSBY= VOUT floating inputs backdrive current operating supply current high, ILOAD VSBY standby supply current VSBY SEL=high, ILOAD VSBY operating supply current VSBY low, ILOAD higher, quiescent current VSBY VCC, floating VSBY lower, quiescent current VSBY VCC, floating lower, quiescent current VSBY >VCC, floating VSBY higher, quiescent current VSBY >VCC, floating input Logic-1 threshold input Logic-0 threshold output Logic-0 threshold
UNIT
version higher ON-resistance. other functions identical regular version.
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Functions higher current power source. Whenever
above will selected, VSBY will deselected.
PRELIMINARY CM3501
During cold-start interval when input initially applied, internal circuitry provides soft turn-on switches, which limits peak in-rush current.
VSBY lower current power source. Whenever
below 0.8V will selected, will deselected. VSBY power switches only supply 100mA. VOUT1 provides power port. internal MOSFET switches designed voltage drops from voltage input pins their full rated currents.
3-level logic input that used
control which power switch pairs turned high select VCC, select VSBY, allow float deselect both power switches. external device driving must able source sink 100µA while maintaining proper VIL/VIH levels.
VOUT2 provides power second port.
internal MOSFET switches designed voltage drops from voltage input pins their full rated currents. Current loads 750mA allowed (from Vcc). Current loads above 750mA cause constantcurrent limiting circuit operate reducing output voltage. Continuous over-current loads will cause part's internal temperature rise. internal temperature exceeds 150'C then switch that overcurrent mode will immediately turned off. switch that overcurrent mode will remain will affected over-temperature detection. Once part cooled 125'C then switch switches that were overcurrent mode will automatically turned again.
OC1#, OC2# independent, active opendrain outputs, indicating overcurrent fault condition been detected VOUT1 VOUT2. There builtin 10msec (min.) fault blanking period after overcurrent fault condition been detected, before these outputs become active. outputs become deasserted only when both overcurrent condition stops when voltage drop across switch less than External pull-up resistors 100k required outputs used.
negative reference voltages.
Symbol VSBY OC2# VOUT2 VOUT1 OC1#
Functions Description Negative reference voltages. High current positive supply input. Standby positive supply input. Also provides internal power. 3-level logic input. High VCC, VSBY, Floating both Active when VOUT2 overcurrent mode. Output voltage internally switched either VSBY input source. Output voltage internally switched either VSBY input source. Active when VOUT1 overcurrent mode.
STANDARD PART ORDERING INFORMATION Pins Package SOIC Ordering Part Number CM3501-02SN
Part Marking CM3501-02SN
Note Parts shipped Tape Reel form unless otherwise specified.
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
PRELIMINARY CM3501
Response Momentary Overcurrent Fault
>750mA <700mA
IOUT
VOUT drops reduce IOUT
VOUT
goes active after 10ms (min) 20ms (typ.) delay
goes inactive soon overcurrent condition stops
<150'C
DieTemp.
Response Continuous Overcurrent Fault
>750mA
IOUT
VOUT drops reduce IOUT
Re-powers when temperature drops 125'C Total powerdown when over-temperature limit reached
VOUT
goes active after 10ms (min) 20ms (typ.) delay stays TMAX 150'C 150'C
Temp.
TMIN 125'C Note: other port stays (unless also current limit.)
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Typical Operating Characteristics
CM3501
[uA]
PRELIMINARY CM3501
Idd(SEL=Vdd) Idd(SEL=floats
CM3501 Vout-Iout characteristic (SEL=0V, Vsby active)
IOUT
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
PRELIMINARY CM3501
CM3501 Vout-Iout characteristic (SEL=5V, active)
IOUT
Fault Blanking Delay
Delay [msec]
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
PRELIMINARY CM3501
SOIC-8 Package Dimensions
2003 California Micro Devices Corp. rights reserved
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com

Dual Overcurrent Switch 750mA (VCC) 100mA (VSBY) Dual outputs, ea

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