CALMIRCO CM3511 Dual usb overcurrent switch 1.2a (vcc) / 200ma (vsby) Datasheet

PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
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 (95µA 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
OC1#
TOP
VCC
VSBY
Applications
VOUT1
SOIC-8
VOUT2
OC2#
SEL
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.
5V VCC
5V VSBY
Select VCC
GND
OC1#
VCC
VOUT1
VSBY
VOUT2
SEL
OC2#
VBUS
VBUS
2 USB Ports
2 USB Ports
Simplified Electrical Schematic
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.
CP
CP
H Over
current
protect
L Over
current
protect
H Over
current
protect
430 N. McCarthy Blvd, Milpitas, California 95035
OC2#
VOUT2
L Over
current
protect
© 2002 California Micro Devices Corp. All rights reserved.
11/10/03
OC1#
VOUT1
C0970500
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
PRELIMINARY
CM3511
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
Unit
V
V
°C
A
W
* - Internally limited
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 = 25°C
VCC Switch ON-Resistance
ILOAD = 0 to 1200mA; VCC = 5V
0.13
0.20
T=25°C
VSBY Switch ON-Resistance
ILOAD = 0 to 200mA; VSBY = 5V
0.7
1.4
T = 25°C
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
I
=
0mA
LOAD
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
=
5V,
V
>V
,
SEL
floating
V
CC
SBY
CC
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
Ω
Ω
mA
mA
ms
°C
°C
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
V
uA
V
Note: the internal supply current is taken from whichever input (VCC or VSBY) is higher.
© 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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Pin Functions
VCC is the higher current power source. Whenever the
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.
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 100µA while
maintaining the proper VIL/VIH levels.
SEL pin is above 2V it will be selected, and VSBY will be
deselected.
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
OC1#, OC2# are independent, active low open-
VOUT1 provides the power for a USB port. The internal
drain 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.
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
internal MOSFET switches are designed for low voltage
drops from the voltage input pins at their full rated
currents.
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
Symbol
GND
VCC
VSBY
SEL
OC2#
VOUT2
7
8
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
1
Pins
Package
Ordering Part Number
Part Marking
8
SOIC
CM3511-04SN
CM3511-04SN
© 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
3
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
OC# Response to Momentary Overcurrent Fault
>1200mA
IOUT
<1200mA
VOUT drops to reduce IOUT
VOUT
OC# goes active
after 10ms (min)
20ms (typ.) delay
OC#
OC# goes inactive as
soon as overcurrent
condition stops
<150’C
DieTemp.
OC# Response to Continuous Overcurrent Fault
>1200mA
IOUT
Re-powers when
temperature drops
to 125’C
VOUT drops to reduce IOUT
Total powerdown when
over-temperature limit
reached
VOUT
OC# goes active
after 10ms (min)
20ms (typ.) delay
OC#
OC# stays low
150’C
TMAX = 150’C
Die Temp.
TMIN = 125’C
Note: The other port stays on (unless it is also in current limit.)
© 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
4
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Typical Operating Characteristics
VCC On-resistance
Resistance
[milliohms]
190
180
170
160
Vcc=5.5V
150
Vcc=5.0V
140
Vcc=4.5V
Vcc=4.0V
130
120
110
100
-40
-20
0
20
40
60
80
100
120
140
Temperature ['C]
VSBY On-resistance
Resistance
[milliohms]
950
900
850
800
Vsby=5.5V
750
Vsby=5.0V
700
Vsby=4.5V
Vsby=4.0V
650
600
550
500
-40
-20
0
20
40
60
80
100
120
140
Temperature ['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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Vout-Iout characteristic (SEL=5V, Vcc active)
V OUT
[V]
6
5
4
3
2
1
0
0
0.5
1
1.5
2
2.5
3
3.5
IOU [A]
Vout-Iout characteristic (SEL=0V, Vsby active)
V OUT
[V]
6
5
4
3
2
1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
IOUT [A]
© 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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
ICC vs. VCC
120
110
100
ICC [uA]
90
80
Idd(SEL=Vcc)
70
Idd(SEL=floats )
60
50
40
30
20
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
V CC [V]
Supply current
Current [uA]
120
100
80
Vcc=5.0V SEL=float
Vcc=4.0V SEL=float
Vcc=5.0V SEL=0V
60
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]
© 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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
OC# Fault Blanking Period
40
35
Delay [msec]
30
25
20
15
10
5
0
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
V C C [V]
OC# Fault Blanking Period
25
Time [milliseconds]
20
15
Vcc=5.0V
10
Vcc=4.0V
5
0
-40
-20
0
20
40
60
80
100
120
140
Temperature ['C]
Undervoltage Lock-Out (UVLO)
2.2
2.15
Supply voltage V
CC
or V SBY [V]
2.25
2.1
2.05
2
1.95
-40
-20
0
20
40
60
80
100
120
140
Te m pe rature ['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
8
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
VCC Turn-on time
250
200
Time [usec]
150
Vcc=5.5V
Vcc=4.5V
100
50
0
-40
-20
0
20
40
60
80
Te mpe rature ['C]
VSBY Turn-on time
5
Time [usec]
4
3
Vsby=5.5V
Vsby=4.5V
2
1
0
-40
-20
0
20
40
60
80
T emperature ['C]
VCC T urn-off time
5.0
Time [usec]
4.0
3.0
Vcc=5.5V
Vcc=4.5V
2.0
1.0
0.0
-40
-20
0
20
40
60
80
Te mpe rature ['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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
VSBY Turn-off time
50
Time [usec]
40
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
Time [usec]
120
100
80
60
40
Cout=0.1u
20
Cout=1u
0
4
4.5
5
5.5
V CC [V ]
Turn-on time v s. VSB Y
5
4.5
4
Time [usec]
3.5
3
2.5
2
1.5
1
Cout=0.1u
0.5
Cout=1u
0
4
4.5
5
5.5
V SBY [V ]
© 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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Turn-off time vs. V C C
30
25
Time [usec]
20
Cout=0.1u
15
Cout=1u
10
5
0
4
4.5
5
5.5
V CC [V ]
Turn-off time vs. V SB Y
300
250
Time [usec]
200
Cout=0.1u
150
Cout=1u
100
50
0
4
4.5
5
5.5
V SBY [V ]
© 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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
Normalized Overcurrent indicator trip point (V CC )
1.50
1.40
Current [normalized]
1.30
1.20
1.10
Vcc=5.5V
1.00
Vcc=4.5V
0.90
0.80
0.70
0.60
0.50
-40
-20
0
20
40
60
80
100
120
Temperature ['C]
Normalized Overcurrent indicator trip point (V SBY)
1.20
1.15
Current [normalized]
1.10
1.05
1.00
Vsby=5.5V
Vsby=4.5V
0.95
0.90
0.85
0.80
-40
-20
0
20
40
60
80
100
120
Temperature ['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
PRELIMINARY
CM3511
CALIFORNIA MICRO DEVICES
SOIC-8 Package Dimensions
© 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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