Dual Overcurrent Switch 1.2A (VCC) 200mA (VSBY) Dual outputs, eac

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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
VSBY
SOIC-8
OC1# VOUT1 VOUT2 OC2#
Applications
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. 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.
VSBY Select VSBY
OC1# VOUT1 VOUT2 OC2# VBUS VBUS Ports Ports
Simplified Electrical Schematic
Over current protect Over current protect Over current protect Over current protect
C0970500
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.
2002 California Micro Devices Corp. rights reserved.
OC1# VOUT1
OC2# VOUT2
11/10/03
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 CM3511
Unit
Operating Conditions (unless specified otherwise) Parameter Range VCC, VSBY Input Voltage Ambient Temperature 1200 ILOAD port VSBY Symbol UVLO VOUT1, VOUT2 RSW1 RSW2 ILIM ILIM VSBY tFBD TMAX TMIN ISBY ISBY ISBY ISBY VIH-EN VIL-EN IOHZ-OC VOL-OC
Unit
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 VSBY= VOUT floating inputs backdrive current VSBY high, operating supply current ILOAD VSBY standby supply current VSBY operating supply current VSBY VSBY >VCC low, 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
UNIT
Note: internal supply current taken from whichever input (VCC VSBY) higher.
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
Functions
above will selected, VSBY will deselected.
PRELIMINARY CM3511
During cold-start interval when input initially applied, internal circuitry provides soft turn-on switches, which limits peak in-rush current.
higher 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.
VSBY lower current power source. Whenever
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. 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.
VOUT1 provides power port. internal
MOSFET switches designed voltage drops from voltage input pins their full rated currents. internal MOSFET switches designed voltage drops from voltage input pins their full rated currents.
VOUT2 provides power second port.
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#
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
2003 California Micro Devices Corp. rights reserved
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
VOUT
goes active after 10ms (min) 20ms (typ.) delay
goes inactive soon overcurrent condition stops
<150'C
DieTemp.
Response Continuous Overcurrent Fault
>1200mA
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.) Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
2003 California Micro Devices Corp. rights reserved
11/10/03
McCarthy Blvd, Milpitas, California 95035
Typical Operating Characteristics
Resistance [milliohms] Temperature ['C]
PRELIMINARY CM3511
On-resistance
Vcc=5.5V Vcc=5.0V Vcc=4.5V Vcc=4.0V
Resistance [milliohms]
VSBY On-resistance
Vsby=5.5V Vsby=5.0V Vsby=4.5V Vsby=4.0V
Temperature ['C]
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
PRELIMINARY CM3511
Vout-Iout characteristic (SEL=5V, active)
Vout-Iout characteristic (SEL=0V, Vsby active)
IOUT
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
[uA]
PRELIMINARY CM3511
Idd(SEL=Vcc) Idd(SEL=floats
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]
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
Fault Blanking Period
Delay [msec]
PRELIMINARY CM3511
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]
2003 California Micro Devices Corp. rights reserved
11/10/03
McCarthy Blvd, Milpitas, California 95035
Supply voltage
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
Turn-on time
PRELIMINARY CM3511
Time [usec]
Vcc=5.5V Vcc=4.5V
rature ['C]
VSBY Turn-on time
Time [usec]
Vsby=5.5V Vsby=4.5V
emperature ['C]
urn-off time
Time [usec]
Vcc=5.5V Vcc=4.5V
rature ['C]
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
VSBY Turn-off time
PRELIMINARY CM3511
Time [usec]
Vsby=5.5V Vsby=4.5V
emperature ['C]
Turn-on time
Time [usec] Cout=0.1u Cout=1u
Turn-on time
Time [usec] Cout=0.1u Cout=1u
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
Turn-off time
PRELIMINARY CM3511
Time [usec] Cout=0.1u Cout=1u
Turn-off time
Time [usec] Cout=0.1u Cout=1u
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
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 Temperature ['C]
PRELIMINARY CM3511
Vcc=5.5V Vcc=4.5V
Normalized Overcurrent indicator trip point SBY)
1.20 1.15 1.10 Current [normalized] 1.05 1.00 0.95 0.90 0.85 0.80 Temperature ['C] Vsby=5.5V Vsby=4.5V
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
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

Dual Overcurrent Switch 1.2A (VCC) 200mA (VSBY) Dual outputs, eac

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