Dual Overcurrent Switch 1.2A (VCC) 200mA (VSBY) Dual outputs, eac
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PRELIMINARY CM3511
Dual Overcurrent Switch 1.2A (VCC) 200mA (VSBY)
Dual outputs, each with independent over-current protection circuitry indicator Supports standby mode that peripheral ramp down safely current <100mA 1.2A (VCC) 200mA (VSBY) continuous current each output Over-current limits 1.2A 200mA respectively 10msec fault blanking delay outputs prevents false overcurrent alarms Prevents backdrive current when host powered operating current (95µA typ.) Small 8-Lead SOIC package motherboards, Notebooks, Set-Top-Boxes CM3511 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
SOIC-8
OC1# VOUT1 VOUT2 OC2#
Applications
VSBY
Typical Application Circuit
Product Description
California Micro Devices' CM3511 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 between inputs.
OC1#
VSBY
VOUT1
VBUS
Ports Ports
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.
Select
VSBY
VOUT2
VBUS
OC2#
Simplified Electrical Schematic
Both pairs switches have over-current protection. Depending whether `SEL' high low, current over 1.2A 200mA respectively either output causes device enter constant-current mode, where output voltage progressively reduced prevent current from increasing further. Each VSBY 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.
McCarthy Blvd, Milpitas, California 95035
Over current protect Over current protect
OC1# VOUT1
Over current protect Over current protect
OC2# VOUT2
2002 California Micro Devices Corp. rights reserved.
C0970500
11/10/03
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 CM3511
Unit
Symbol UVLO VOUT1, VOUT2 RSW1 RSW2 ILIM ILIM VSBY tFBD TMAX TMIN ISBY ISBY ISBY ISBY VIH-EN VIL-EN IOHZ-OC VOL-OC Electrical Operating Characteristics (over operating conditions unless specified otherwise) Parameter Conditions VCC/VSBY voltage under which circuit locks will operate Output Voltage ILOAD 1000mA, 5.0V, 25°C Switch ON-Resistance ILOAD 1200mA; 0.13 0.20 T=25°C VSBY Switch ON-Resistance ILOAD 200mA; VSBY 25°C over-current limit high 1200 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 inputs backdrive current VSBY= VOUT floating VSBY high, operating supply current ILOAD VSBY standby supply current VSBY VSBY >VCC low, VSBY operating supply current ILOAD standby supply current higher, quiescent current VSBY VCC, floating VSBY lower, quiescent current lower, quiescent current VSBY >VCC, floating VSBY higher, quiescent current input Logic-1 threshold input Logic-0 threshold output state leakage VOUT output Logic-0 threshold
Note: internal supply current taken from whichever input (VCC VSBY) higher.
2003 California Micro Devices Corp. rights reserved
Operating Conditions (unless specified otherwise) Parameter Range VCC, VSBY Input Voltage Ambient Temperature 1200 ILOAD port VSBY
Unit
UNIT
11/10/03
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. VSBY lower current power source. Whenever below 0.8V will selected, will deselected. VSBY power switches only supply 200mA each.
Note that internal supply current (95uA typ.) will taken from whichever input supply (VCC VSBY) higher.
PRELIMINARY CM3511
During cold-start interval when input initially applied, internal circuitry provides soft turn-on switches, which limits peak in-rush current.
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.
Current loads 1.2A allowed (sourced from Vcc). Current loads above 1.2A 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. Symbol VSBY OC2# VOUT2 VOUT1 OC1#
2003 California Micro Devices Corp. rights reserved
MOSFET switches designed voltage drops from voltage input pins their full rated currents.
VOUT1 provides power port. internal
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. Because they open-drain, outputs shorted together make signal.
VOUT2 provides power second port. internal MOSFET switches designed voltage drops from voltage input pins their full rated currents.
negative reference voltages.
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
11/10/03
Package SOIC
Ordering Part Number CM3511-04SN
Part Marking CM3511-04SN
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Note Parts shipped Tape Reel form unless otherwise specified.
PRELIMINARY CM3511
Response Momentary Overcurrent Fault
>1200mA <1200mA
IOUT
VOUT drops reduce IOUT
2003 California Micro Devices Corp. rights reserved
goes active after 10ms (min) 20ms (typ.) delay goes inactive soon overcurrent condition stops <150'C
VOUT
DieTemp.
Response Continuous Overcurrent Fault
>1200mA
IOUT
VOUT drops reduce IOUT
Re-powers when temperature drops 125'C
VOUT
Total powerdown when over-temperature limit reached
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.) Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
11/10/03
McCarthy Blvd, Milpitas, California 95035
Typical Operating Characteristics
Resistance [milliohms]
PRELIMINARY CM3511
On-resistance
Vcc=5.5V Vcc=5.0V Vcc=4.5V Vcc=4.0V
2003 California Micro Devices Corp. rights reserved
Temperature ['C] Resistance [milliohms] Temperature ['C]
VSBY On-resistance
Vsby=5.5V Vsby=5.0V Vsby=4.5V Vsby=4.0V
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
PRELIMINARY CM3511
Vout-Iout characteristic (SEL=5V, active)
2003 California Micro Devices Corp. rights reserved
Vout-Iout characteristic (SEL=0V, Vsby active)
IOUT
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
[uA]
PRELIMINARY CM3511
Idd(SEL=Vcc) Idd(SEL=floats
2003 California Micro Devices Corp. rights reserved
Supply current
Current [uA]
Vcc=5.0V SEL=float Vcc=4.0V SEL=float Vcc=5.0V SEL=0V Vcc=4.0V SEL=0V Vcc=5.0V SEL=5V Vcc=4.0V SEL=4V
Temperature ['C]
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Fault Blanking Period
Delay [msec]
PRELIMINARY CM3511
Supply voltage
2003 California Micro Devices Corp. rights reserved
Fault Blanking Period
Time [milliseconds]
Vcc=5.0V Vcc=4.0V
Temperature ['C]
Undervoltage Lock-Out (UVLO)
2.25
2.15 2.05 1.95
rature ['C]
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Turn-on time
PRELIMINARY CM3511
Time [usec]
Vcc=5.5V Vcc=4.5V
Time [usec]
2003 California Micro Devices Corp. rights reserved
rature ['C]
VSBY Turn-on time
Time [usec]
Vsby=5.5V Vsby=4.5V
emperature ['C]
urn-off time
Vcc=5.5V Vcc=4.5V
rature ['C]
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
VSBY Turn-off time
PRELIMINARY CM3511
Time [usec]
Vsby=5.5V Vsby=4.5V
emperature ['C]
Time [usec]
2003 California Micro Devices Corp. rights reserved
Turn-on time
Time [usec] Cout=0.1u Cout=1u
Turn-on time
Cout=0.1u Cout=1u
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Turn-off time
PRELIMINARY CM3511
Time [usec] Cout=0.1u Cout=1u
2003 California Micro Devices Corp. rights reserved
Turn-off time
Time [usec]
Cout=0.1u Cout=1u
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Normalized Overcurrent indicator trip point
1.50 1.40 1.30 Current [normalized] 1.20 1.10 1.00 0.90 0.80 0.70 0.60 0.50
PRELIMINARY CM3511
Vcc=5.5V Vcc=4.5V
2003 California Micro Devices Corp. rights reserved
Temperature ['C]
Normalized Overcurrent indicator trip point SBY)
1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
Current [normalized]
Vsby=5.5V Vsby=4.5V
Temperature ['C]
11/10/03
McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
PRELIMINARY CM3511
SOIC-8 Package Dimensions
2003 California Micro Devices Corp. rights reserved
11/10/03
McCarthy Blvd, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
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