Dual Overcurrent 750mA Switches with Independent Controls Dual sw

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Dual Overcurrent 750mA Switches with Independent Controls Dual sw

Datasheet Thumbnail

Top Searches for this datasheet

PRELIMINARY CM3502
Dual Overcurrent 750mA Switches with Independent Controls
Dual switches, each with independent over-current protection indicator, ports active Enable controls, channel ON-resistance switches 750mA continuous current each channel Over-current limits 750mA 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 CM3502 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
EN1#
OC1# VOUT1 VOUT2 OC2# SOIC-8
Applications
PC's, notebooks, STBs with ports (i.e., CM3502 ports CM3502s ports, etc) EN2#
Product Description
California Micro Devices CM3502 dual channel overcurrent power switch that provides power independent ports. device on-resistance power switches that provide VBUS voltage each output port with minimal voltage drop. When either inputs logic low, corresponding power switch connected corresponding output through switch. When either inputs logic high, corresponding power switch OFF, power available output. Both power switches have full over-current protection. Whenever current limit either switch exceeded, device enters constantcurrent mode, output voltage progressively reduced prevent current from increasing further. Each switch independent other, switch overcurrent mode then will remain switched output becomes active only overcurrent condition exceeds minimum continuous duration 10ms. This fault blanking delay prevents false alarms being reported host controller. overcurrent condition severe enough that part heats thermal limit TMAX, then that switch will turned device temperature cools down. TMIN switch then turns again, device heats again TMAX, until fault removed.
Typical Application Circuit
EN1# EN2#
OC1# VOUT1 VOUT2
OC2#
VBUS
Port Port
VBUS
Simplified Electrical Schematic
EN1# Over current protect EN2# Over current protect
VOUT2 OC2# OC1# VOUT1
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
PRELIMINARY CM3502
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
Unit
Operating Conditions (unless specified otherwise) Parameter Range Input Voltage Ambient Temperature ILOAD portB
Unit
Symbol UVLO VOUT1, VOUT2 ILIM tFBD
TMAX TMIN
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 750mA; 0.13 25°C Output Voltage ILOAD 500mA, 5.0V, 25°C Over-current limit 25°C 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 VOUT1,2 input =high, T=25°C Operating supply current Quiescent current high input Logic-1 threshold input Logic-0 threshold output Logic-0 threshold
UNIT
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 power source. VOUT1 provides power first load. internal
MOSFET switches designed very voltage drops from voltage input pins their full rated currents.
PRELIMINARY CM3502
EN1#, EN2# active logic input pins that
used control power switches. Both switches independent. EN1# EN2# high >2V) deselect VOUT1 VOUT2 respectively, EN1# EN2# <0.8V) select VOUT1 VOUT2 respectively.
VOUT2 provides power second load. internal
MOSFET switches designed very voltage drops from voltage input pins their full rated currents. Current loads 750mA allowed. Current loads above 750mA cause constant-current limiting circuit operate, thereby 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. During cold-start interval when input initially applied, internal circuitry provides soft turn-on switch, which limits peak in-rush current. Functions Description Negative reference voltages. Power supply input. Active Enable VOUT1. Active Enable VOUT2.
OC1#, OC2# independent active opendrain outputs, indicating overcurrent fault condition been detected VOUT1 VOUT2. There builtin 10msec (min.) fault blanking delay after overcurrent fault condition been detected, before these outputs become active. outputs become inactive 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 EN1# EN2# OC2# VOUT2 VOUT1 OC1#
Active when VOUT2 overcurrent mode. Output voltage Output voltage Active when VOUT1 overcurrent mode.
STANDARD PART ORDERING INFORMATION Pins Package SOIC Ordering Part Number CM3502-02SN
Part Marking CM3502-02SN
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 CM3502
Response Momentary Overcurrent Fault
>750mA
<700mA
IOUT
VOUT drops reduce
VOUT
goes active after 10ms (min) 20ms (typ.) delay
goes inactive soon overcurrent condition stops
<150'C
Temp.
Response Continuous Overcurrent Fault
>750mA 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: 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
CM3502 -IOUT characteristic (EN#=0V)
PRELIMINARY CM3502
IOUT
Fault Blanking Delay
Delay [msec]
CM3502 Quiescent supply current supply voltage
[uA]
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 CM3502
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 750mA Switches with Independent Controls Dual sw

Top Searches for this datasheet

Other recent searches