High-side high current switch with active Enable Very on-resistance sw
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CALIFORNIA MICRO DEVICES Single 1.4A Overcurrent Switch
High-side high current switch with active Enable Very on-resistance switch (0.07? typ.) 1.4A continuous current output Over-current limits 1.4A 10msec fault blanking delay output 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
PRELIMINARY CM3503
Diagram
SOIC-8
VOUT VOUT VOUT
Applications
ports supply overcurrent protection
Product Description
California Micro Devices' CM3503 overcurrent power switch that provides power ports. device very on-resistance power switch that provides VBUS voltage output ports with minimal voltage drop. When logic low, power switch connected output VOUT. When logic high, power switch OFF, power available output. power switch full over-current protection. Whenever current limit switch exceeded, device enters constant-current mode, where output voltage progressively reduced prevent current from increasing further. output becomes active only overcurrent condition exceeds least 10ms. This fault blanking delay prevents false alarms from being reported host controller. overcurrent condition severe enough that part heats thermal limit TMAX, then switch will turned temperature cools down. TMIN switch then turns again, device heats again, until fault removed. CM3503 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.
Typical Application Circuit
VOUT VOUT VOUT VBUS
VBUS Port Port
Simplified Electrical Schematic
Over current protect VOUT
2003 California Micro Devices Corp. rights reserved.
C0970500
09/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
CALIFORNIA MICRO DEVICES
Absolute Maximum Ratings Parameter Rating Protection (All pins, HBM) 2000 Input Voltage 5.6, Storage Temperature Range +150 Operating Ambient Operating Junction +150* Output Current Loading Internally limited Package Power Dissipation
*Internally limited
PRELIMINARY CM3503
Unit
Operating Conditions (unless specified otherwise) Parameter Range Input Voltage Ambient Temperature ILOAD 1400
Unit
Symbol UVLO RSWa RSWb VOUT ILIM tFBD
TMAX TMIN IRCC ICCQ VIH-EN VIL-EN VOL-OC
Electrical Operating Characteristics (over operating conditions unless specified otherwise) Parameter Conditions voltage under which circuit T=25°C locks will operate Switch ON-Resistance ILOAD 1400mA; 0.07 25°C Switch ON-Resistance ILOAD 1400mA; 0.125 +85°C Switch ON-Resistance ILOAD 1400mA; 0.125 +85°C Output Voltage ILOAD 1000mA, 5.0V, EN#=0V, T=25°C Over-current limit 1400 2000 2600 T=25°C Time delay from overcurrent detection output indication (fault blanking delay) Temperature which switch turns during overcurrent Temperature which switch turns after cooling from TMAX Reverse leakage from output VOUT high, input T=25°C Operating supply current Quiescent current high input Logic-1 threshold input Logic-0 threshold output Logic-0 threshold
UNIT
Note: This preliminary datasheet only. Data subject change time. 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
CALIFORNIA MICRO DEVICES
Functions power source.
Pins must connected together externally
PRELIMINARY CM3503
active logic input that used VOUT provides power loads. internal
MOSFET switch designed very voltage drops from voltage input pins full rated current. Pins must connected together externally. Current loads 1.4A allowed. Current loads above 1.4A cause constant-current limiting circuit operate reducing output voltage. Continuous over-current loads will cause part's internal temperature rise. internal temperature exceeds 150'C then switch immediately turns off. Once part cooled 125'C then switch automatically turns again. During cold-start interval when input initially applied, internal circuitry provides soft turn-on switch, which limits peak in-rush current. control power switch. high (>2V) deselect VOUT, (<0.8V) select VOUT.
active open-drain output voltage,
indicating overcurrent fault condition been detected VOUT. There built-in 10msec (min.) fault blanking delay after overcurrent fault condition been detected, before this output becomes active low. output deasserts only when both overcurrent condition stops when voltage drop across switch less than external pull-up resistor 100k required output used.
negative reference voltages.
Symbol VOUT VOUT VOUT
Descriptions Description Negative reference voltages. Power Primary High current Positive supply input. Power supply input connected Active enable Active when VOUT overcurrent mode. External pull-up resistor required. Output connected pins Output connected pins Output connected pins
STANDARD PART ORDERING INFORMATION Pins Package SOIC Ordering Part Number CM3503-02SN
Part Marking CM3503-02SN
Note Parts shipped Tape Reel form unless otherwise specified.
Note: This preliminary datasheet only. Data subject change time. 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
CALIFORNIA MICRO DEVICES
Response Momentary Overcurrent Fault
>1400mA
PRELIMINARY CM3503
<1300mA
IOUT
VOUT drops reduce IOUT
VOUT
goes active after 10ms (min) 20ms (typ.) delay
goes inactive soon overcurrent condition stops
<150'C
Temp.
Response Continuous Overcurrent Fault
>1400mA IOUT
VOUT drops reduce IOUT VOUT Total powerdown when over-temperature limit reached
Re-powers when temperature drops 125'C
goes active after 10ms (min) 20ms (typ.) delay stays TMAX 150'C 150'C
Temp.
TMIN 125'C
Note: This preliminary datasheet only. Data subject change time. 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
CALIFORNIA MICRO DEVICES
Typical Operating characteristics
CM3503 Quiescent supply current supply voltage [uA]
PRELIMINARY CM3503
Fault Blanking Delay
Delay [msec]
CM3503 IOUT characteristic
IOUT
Note: This preliminary datasheet only. Data subject change time. 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
CALIFORNIA MICRO DEVICES
PRELIMINARY CM3503
SOIC-8 Package Dimensions
Note: This preliminary datasheet only. Data subject change time. 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
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