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CALIFORNIA MICRO DEVICES
PRELIMINARY CM3511
Dual USB Overcurrent Switch 1.2A (VCC) / 200mA (VSBY)
Features
* * * * * * * * Dual outputs, each with independent over-current protection circuitry and indicator Supports standby mode in PCs so that a peripheral can ramp down safely to a current <100mA Up to 1.2A (VCC) / 200mA (VSBY) continuous current on each output Over-current limits at 1.2A / 200mA respectively 10msec min fault blanking delay on OC# outputs prevents false overcurrent alarms Prevents backdrive current when host powered off Low operating current (95A typ.) Small 8-Lead SOIC package PC motherboards, Notebooks, Set-Top-Boxes The CM3511 also prevents backdrive current flowing into the host from the connected peripheral. This can occur when VCC is removed as the host powers down, and the peripheral still has normal power applied. The 5V from the peripheral can therefore be linked to the host's VBUS, potentially causing backdrive current into the host and overloading the peripheral power supply.
Pin Diagram
GND VCC VSBY SEL
TOP SOIC-8
OC1# VOUT1 VOUT2 OC2#
Applications
*
Typical Application Circuit Product Description
California Micro Devices' CM3511 is a dual port USB overcurrent power switch that selects between two independent 5V inputs available on a PC, depending on the state of a logic input (SEL). The device has two pairs of power switches, and each pair is an analog "OR" function, providing a continuous voltage at both outputs during power transfer between inputs. VCC is the main 5V supply, which can be disabled in a PC, and VSBY is the 5V standby supply which is powered up whenever the PC has power. When the `SEL' pin is at logic high, VCC is the assigned input power supply. When `SEL' is at logic low, VSBY is used to power the output, and no current is taken from VCC. Both switches can be deselected and switched off by not driving (floating) the `SEL' input, which places the chip in low power mode.
GND 5V VCC 5V VSBY Select VCC VCC VSBY SEL
OC1# VOUT1 VOUT2 OC2# VBUS VBUS 2 USB Ports 2 USB Ports
Simplified Electrical Schematic
CP H Over current protect L Over current protect H Over current protect L Over current protect
C0970500
Both pairs of switches have over-current protection. Depending on whether `SEL' is high or low, a current VCC over 1.2A or 200mA respectively out of either output causes the device to enter a constant-current mode, SEL where the output voltage is progressively reduced to prevent the current from increasing further. Each VSBY output is independent of the other, so if one of the switches is switched on but is not in overcurrent mode then it will remain switched on. The OC# output becomes active only if the overcurrent condition exceeds a minimum continuous duration of 10ms. If the overcurrent condition is severe enough that the part heats up to the thermal limit TMAX, the switch turns off and the temperature cools down to TMIN. The switch then turns on again, and the device heats up again, and so on, until the fault is removed.
(c) 2002 California Micro Devices Corp. All rights reserved.
OC1# VOUT1
CP
OC2# VOUT2
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
Absolute Maximum Ratings Parameter Rating ESD Protection (All pins, HBM) 2000 VCC, VSBY Input Voltage + 5.6, GND - 0.5 Storage Temperature Range -55 to +150 Operating Ambient -40 to +85 Operating Junction -40 to +150* Output Current Loading Internally limited Package Power Dissipation 0.5
* - Internally limited
PRELIMINARY CM3511
Unit V V C A W
Operating Conditions (unless specified otherwise) Parameter Range VCC, VSBY Input Voltage 4.5 to 5.5 Ambient Temperature -40 to +85 0 to 1200 ILOAD per port VCC VSBY 0 to 200 Symbol UVLO VOUT1, VOUT2 RSW1 RSW2 ILIM VCC ILIM VSBY tFBD TMAX TMIN IR CC IR SBY ICC ON ISBY OFF ISBY ON ICC OFF ICC H Q ISBY L Q ICC L Q ISBY H Q VIH-EN VIL-EN IOHZ-OC VOL-OC
Unit V C mA
Electrical Operating Characteristics (over operating conditions unless specified otherwise) Parameter Conditions MIN TYP MAX VCC/VSBY voltage under which 2.2 2.5 circuit locks out - will not operate Output Voltage ILOAD = 1000mA, VCC = 5.0V, 4.8 SEL = 5V, T = 25C VCC Switch ON-Resistance ILOAD = 0 to 1200mA; VCC = 5V 0.13 0.20 T=25C VSBY Switch ON-Resistance ILOAD = 0 to 200mA; VSBY = 5V 0.7 1.4 T = 25C VCC over-current limit VCC = 5V SEL = high 1200 VSBY over-current limit VSBY = 5V SEL = low 200 Time delay from overcurrent 10 20 detection to OC# output indication (fault blanking delay) Temperature at which hot switch 150 turns off during overcurrent 125 Temperature at which cool switch turns on, after cooling from TMAX Reverse leakage from outputs VCC = 0V, VOUT = 5V, SEL floating 1 VSBY= 0V, VOUT = 5V, SEL floating to inputs - backdrive current 1 VCC = 5V, VSBY < VCC , SEL = high, VCC operating supply current 95 ILOAD = 0mA 1 VSBY standby supply current VSBY operating supply current 95 VSBY = 5V, VSBY >VCC , SEL = low, ILOAD = 0mA 1 VCC standby supply current VCC higher, quiescent current 40 VCC = 5V, VSBY < VCC, SEL floating 1 VSBY lower, quiescent current VCC lower, quiescent current 1 VCC = 5V, VSBY >VCC, SEL floating VSBY higher, quiescent current 40 EN# input Logic-1 threshold VCC = 5V 2 EN# input Logic-0 threshold VCC = 5V 0.8 OC# output OFF state leakage VCC = 5V, VOUT = 5V 1.0 OC# output Logic-0 threshold IOC = 1mA to VCC 0.4
UNIT V V mA mA ms C C A A A A A A A A A V V uA V
Note: the internal supply current is taken from whichever input (VCC or VSBY) is higher.
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
2
CALIFORNIA MICRO DEVICES
Pin Functions
SEL pin is above 2V it will be selected, and VSBY will be deselected.
PRELIMINARY CM3511
During the cold-start interval when the input is initially applied, internal circuitry provides a soft turn-on for the switches, which limits peak in-rush current.
VCC is the higher current power source. Whenever the
SEL pin is below 0.8V it will be selected, and VCC will be deselected. The two VSBY power switches can only supply 200mA each. Note that the internal supply current (95uA typ.) will be taken from whichever input supply pin (VCC or VSBY) is higher. VSB
VSBY is the lower current power source. Whenever the
SEL is the 3-level logic input pin that is used to control which of the power switch pairs are turned on. Set SEL high to select VCC, set SEL low to select VSBY, or allow SEL to float to deselect both power switches. The external device driving the SEL pin must able to source and sink 100A while maintaining the proper VIL/VIH levels. OC1#, OC2# are independent, active low opendrain outputs, indicating an overcurrent fault condition has been detected at VOUT1 or VOUT2. There is a builtin 10msec (min.) fault blanking period after the overcurrent fault condition has been detected, before these outputs become active. The OC# outputs become deasserted only when both the overcurrent condition stops and when the voltage drop across the switch is less than 1V. External pull-up resistors of 10k - 100k are required if the OC# outputs are used. Because they are open-drain, the two OC# outputs can be shorted together to make one OC# signal.
VOUT1 provides the power for a USB port. The internal
MOSFET switches are designed for low voltage drops from the voltage input pins at their full rated currents. internal MOSFET switches are designed for low voltage drops from the voltage input pins at their full rated currents.
VOUT2 provides the power for a second USB port. The
Current loads of up to 1.2A are allowed (sourced from Vcc). Current loads above 1.2A may cause the constantcurrent limiting circuit to operate - reducing the output voltage. Continuous over-current loads will cause the part's internal temperature to rise. If the internal temperature exceeds 150'C then any switch that is in overcurrent mode will be immediately turned off. Any switch that is not in overcurrent mode will remain on - it will not be affected by the over-temperature detection. Once the part has cooled to 125'C then the switch or switches that were in overcurrent mode will be automatically turned on again. Pin No. 1 2 3 4 5 6 7 8 Symbol GND VCC VSBY SEL OC2# VOUT2 VOUT1 OC1#
GND is the negative reference for all voltages.
Pin Functions Description Negative reference for all voltages. High current positive supply input. Standby positive supply input. Also provides internal power. 3-level logic input. High = VCC, Low = VSBY, Floating = both off Active low when VOUT2 is in overcurrent mode. Output voltage internally switched to either VCC or VSBY input source. Output voltage internally switched to either VCC or VSBY input source. Active low when VOUT1 is in overcurrent mode. STANDARD PART ORDERING INFORMATION
Pins 8
11/10/03
Package SOIC
Ordering Part Number CM3511-04SN
1
Part Marking CM3511-04SN
(c) 2003 California Micro Devices Corp. All rights reserved
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
CALIFORNIA MICRO DEVICES
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
PRELIMINARY CM3511
OC# Response to Momentary Overcurrent Fault
>1200mA <1200mA
IOUT
VOUT drops to reduce IOUT
VOUT
OC#
OC# goes active after 10ms (min) 20ms (typ.) delay
OC# goes inactive as soon as overcurrent condition stops
<150'C
DieTemp.
OC# Response to Continuous Overcurrent Fault
>1200mA
IOUT
VOUT drops to reduce IOUT
Re-powers when temperature drops to 125'C Total powerdown when over-temperature limit reached
VOUT
OC#
OC# goes active after 10ms (min) 20ms (typ.) delay OC# stays low TMAX = 150'C 150'C
Die Temp.
TMIN = 125'C Note: The other port stays on (unless it is also in current limit.) Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
4
CALIFORNIA MICRO DEVICES
Typical Operating Characteristics
Resistance [milliohms] 190 180 170 160 150 140 130 120 110 100 -40 -20 0 20 40 60 80 100 120 140 Temperature ['C]
PRELIMINARY CM3511
VCC On-resistance
Vcc=5.5V Vcc=5.0V Vcc=4.5V Vcc=4.0V
Resistance [milliohms] 950 900 850 800 750 700 650 600 550 500 -40 -20 0 20 40
VSBY On-resistance
Vsby=5.5V Vsby=5.0V Vsby=4.5V Vsby=4.0V
60
80
100
120
140
Temperature ['C]
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
CALIFORNIA MICRO DEVICES
V OUT [V] 6
PRELIMINARY CM3511
Vout-Iout characteristic (SEL=5V, Vcc active)
5
4
3
2
1
0 0 0.5 1 1.5 IOU [A] 2 2.5 3 3.5
V OUT [V] 6 5 4 3 2 1 0 0
Vout-Iout characteristic (SEL=0V, Vsby active)
0.1
0.2
0.3 IOUT [A]
0.4
0.5
0.6
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
6
CALIFORNIA MICRO DEVICES
ICC vs. VCC
120 110 100 90 ICC [uA] 80 70 60 50 40 30 20 4 4.2 4.4 4.6 4.8 V CC [V] 5 5.2 5.4 5.6
PRELIMINARY CM3511
Idd(SEL=Vcc) Idd(SEL=floats )
Supply current
Current [uA] 120
100
80 Vcc=5.0V SEL=float Vcc=4.0V SEL=float 60 Vcc=5.0V SEL=0V Vcc=4.0V SEL=0V Vcc=5.0V SEL=5V Vcc=4.0V SEL=4V 40
20
0 -40 -20 0 20 40 60 80 100 120 Temperature ['C]
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
7
CALIFORNIA MICRO DEVICES
OC# Fault Blanking Period
40 35 30 Delay [msec] 25 20 15 10 5 0 3.5 3.7 3.9 4.1 4.3 4.5 V C C [V] 4.7 4.9 5.1 5.3
PRELIMINARY CM3511
5.5
OC# Fault Blanking Period
25
20 Time [milliseconds]
15
Vcc=5.0V Vcc=4.0V
10
5
0 -40 -20 0 20 40 60 80 100 120 140 Temperature ['C]
Undervoltage Lock-Out (UVLO)
2.25 2.2 2.15 2.1 2.05 2 1.95 -40 -20 0 20 40 60 80 100 120 140
Te m pe rature ['C]
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Supply voltage V
CC
or V SBY [V]
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
8
CALIFORNIA MICRO DEVICES
VCC Turn-on time
250
PRELIMINARY CM3511
200
Time [usec]
150 Vcc=5.5V Vcc=4.5V 100
50
0 -40 -20 0 20 Te mpe rature ['C] 40 60 80
VSBY Turn-on time 5
4
Time [usec]
3 Vsby=5.5V Vsby=4.5V 2
1
0 -40 -20 0 20 T emperature ['C] 40 60 80
VCC T urn-off time
5.0
4.0
Time [usec]
3.0 Vcc=5.5V Vcc=4.5V 2.0
1.0
0.0 -40 -20 0 20 Te mpe rature ['C] 40 60 80
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
9
CALIFORNIA MICRO DEVICES
VSBY Turn-off time 50
PRELIMINARY CM3511
40
Time [usec]
30 Vsby=5.5V Vsby=4.5V 20
10
0 -40 -20 0 20 40 60 80 T emperature ['C]
Turn-on time v s. VCC
180 160 140 120 Time [usec] 100 80 60 40 20 0 4 4.5 V CC [V ] 5 5.5 Cout=0.1u Cout=1u
Turn-on time v s. VSB Y
5 4.5 4 3.5 Time [usec] 3 2.5 2 1.5 1 0.5 0 4 4.5 V SBY [V ] 5 5.5 Cout=0.1u Cout=1u
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
10
CALIFORNIA MICRO DEVICES
Turn-off time vs. V C C
30
PRELIMINARY CM3511
25
20 Time [usec] Cout=0.1u Cout=1u 10
15
5
0 4 4.5 V CC [V ] 5 5.5
Turn-off time vs. V SB Y
300
250
200 Time [usec] Cout=0.1u Cout=1u
150
100
50
0 4 4.5 V SBY [V ] 5 5.5
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
11
CALIFORNIA MICRO DEVICES
Normalized Overcurrent indicator trip point (V CC )
1.50 1.40 1.30 Current [normalized] 1.20 1.10 1.00 0.90 0.80 0.70 0.60 0.50 -40 -20 0 20 40 60 80 100 120 Temperature ['C]
PRELIMINARY CM3511
Vcc=5.5V Vcc=4.5V
Normalized Overcurrent indicator trip point (V SBY)
1.20 1.15 1.10 Current [normalized] 1.05 1.00 0.95 0.90 0.85 0.80 -40 -20 0 20 40 60 80 100 120 Temperature ['C] Vsby=5.5V Vsby=4.5V
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
12
CALIFORNIA MICRO DEVICES
PRELIMINARY CM3511
SOIC-8 Package Dimensions
(c) 2003 California Micro Devices Corp. All rights reserved
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
13

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