CALMIRCO CM3512-04SN Dual usb overcurrent 1.2a switches with independent control Datasheet

Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Dual USB Overcurrent 1.2A Switches with Independent Controls
The CM3512 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.
Features
•
•
•
•
•
•
•
•
•
Dual switches, each with independent over-current
protection and flag indicator, for 4 USB ports
Two active low Enable controls, one per output
Up to 1.2A continuous current each output
Over-current limits at 1.2A min
10msec min fault blanking delay on OC# outputs
prevents false overcurrent alarms
Prevents backdrive current when host powered off
Low operating current (95µA typ.)
Low quiescent current when disabled (<1µA max)
Small 8-Lead SOIC package
Pin Diagram GND
VCC
•
PC’s, Notebooks, STBs
VOUT1
SOIC-8
EN1#
Applications
OC1#
TOP
VOUT2
OC2#
EN2#
Product Description
Typical Application Circuit
California Micro Devices CM3512 is a dual channel
USB overcurrent power switch that provides 5V
power to four independent USB ports. The device
has two power switches that provide the VBUS
voltage at each USB output port with minimal
voltage drop.
GND
VCC
When either of the EN# inputs is at logic low, the
corresponding power switch is ON and VCC is
connected to the corresponding output through the
switch. When either of the EN# inputs is at logic
high, the corresponding power switch is OFF, and
no power is available at the output.
VCC
OC1#
VOUT1
EN1#
VOUT2
EN2#
OC2#
Both of the power switches have full over-current
protection. Whenever the current limit out of either
switch is exceeded, the device enters a constantcurrent mode, and the output voltage is
Simplified Electrical
progressively reduced to prevent the current from
increasing further. Each switch is independent of the
other, so if a switch is on but is not in overcurrent
mode then it will remain switched on. The OC#
Charge
output becomes active low only if the overcurrent EN1#
Pump
condition exceeds a minimum continuous duration of
10ms. This fault blanking delay prevents false
alarms being reported to the host USB controller.
If the overcurrent condition is severe enough that
the part heats up to the thermal limit TMAX, then that EN2#
switch will be turned off and the device temperature
cools down. At TMIN the switch then turns on again,
VCC
and the device heats up again to TMAX, and so on,
until the fault is removed.
VBUS
2 USB Ports
2 USB Ports
VBUS
Schematic
Over
current
protect
OC1#
VOUT1
Over
current
protect
VOUT2
Charge
Pump
© 2003 California Micro Devices Corp. All rights reserved.
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035
OC2#
C0970500
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Absolute Maximum Ratings
Parameter
Rating
ESD Protection (All pins, HBM)
± 2000
VCC 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 Input Voltage
4.5 to 5.5
Ambient Temperature
-40 to +85
ILOAD per portB
0 to 1200 00
Symbol
UVLO
RSW
VOUT1,
VOUT2
ILIM
tFBD
TMAX
TMIN
IR CC
ICC
ICCQ
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 voltage under which circuit
2.2
2.5
locks out - will not operate
Switch ON-Resistance
ILOAD = 0 to 1200mA; VCC = 5V,
0.13
0.2
T= 25°C
Output Voltage
ILOAD = 1000mA, VCC = 5.0V,
4.8
EN# = 0V, T = 25°C
Over-current limit
1200
VCC = 5V, T = 25°C
10
20
Time delay from overcurrent
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
1
Reverse leakage from outputs
VCC = 0V, VOUT1,2 = 5V,
to input
EN# =high, T=25°C
Operating supply current
EN# = low
95
Quiescent current
EN# = high
1
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
Ω
V
mA
ms
°C
°C
µA
µA
µA
V
V
uA
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
2
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Pin Functions
VCC is the power source.
VOUT1 provides the power for the first load. The internal
MOSFET switches are designed for very low voltage drops
from the voltage input pins at their full rated currents.
VOUT2 provides the power for the second load. The internal
MOSFET switches are designed for very low voltage drops
from the voltage input pins at their full rated currents.
Current loads of up to 1200mA are allowed. Current
loads above 1200mA may cause the constant-current
limiting circuit to operate, thereby 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.
EN1#, EN2# are the active low logic input pins that
are used to control the power switches. Both
switches are independent. Set EN1# and EN2# high
(to >2V) to deselect VOUT1 and VOUT2 respectively, and
set EN1# and EN2# low (to <0.8V) to select VOUT1
and VOUT2 respectively.
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 delay after the
overcurrent fault condition has been detected, before
these outputs become active. The OC# outputs
become inactive 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.
GND is the negative reference for all voltages.
During the cold-start interval when the input is initially
applied, internal circuitry provides a soft turn-on for the
switch, which limits peak in-rush current.
Pin No.
1
2
3
4
5
6
Symbol
GND
VCC
EN1#
EN2#
OC2#
VOUT2
7
8
VOUT1
OC1#
Pin Functions
Description
Negative reference for all voltages.
Power supply input.
Active low Enable pin for VOUT1.
Active low Enable pin for VOUT2.
Active low when VOUT2 is in overcurrent mode.
Output voltage #2.
Output voltage #1.
Active low when VOUT1 is in overcurrent mode.
STANDARD PART ORDERING INFORMATION
1
Pins
Package
Ordering Part Number
Part Marking
8
SOIC
CM3512-04SN
CM3512-04SN
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 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
CM3512
CALIFORNIA MICRO DEVICES
Response to Momentary Overcurrent Fault
>1200mA
<1100mA
IOUT
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
Die
Temp.
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
CM3512
CALIFORNIA MICRO DEVICES
Typical Operating Characteristics
On-resistance
190
180
Resistance [milliohms]
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]
VOUT-IOUT characteristic (EN#=0V)
V OUT
[V] 6
5
4
3
2
1
0
0
0.5
1
1.5
2
2.5
3
3.5
I OUT [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
5
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
OC# Fault Blanking Delay
60
50
Delay [msec]
40
30
20
10
0
3.5
4
4.5
5
5.5
6
V CC [V]
OC# Fault Blanking Period
25
Time [milliseconds]
20
Vcc=5.0V
15
Vcc=4.0V
10
5
0
-40
-20
0
20
40
60
80
100
120
140
T emperature ['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
6
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Supply current vs . s upply voltage
120
100
ICC [uA]
80
60
40
20
0
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
V CC [V]
Supply curre nt [EN#=0V]
140
120
Current [uA]
100
80
Vcc=5.0V
Vcc=4.0V
60
40
20
0
-40
-20
0
20
40
60
80
100
120
Temperature ['C]
Supply current [EN#=logic'1']
5
4.5
4
3.5
Current [uA]
3
V cc=5.0V
2.5
V cc=4.0V
2
1.5
1
0.5
0
-40
-20
0
20
40
60
80
100
120
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
7
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Turn-on time v s. VC C
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-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 ]
© 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
CM3512
CALIFORNIA MICRO DEVICES
Turn-on time
250
Time [usec]
200
150
Vcc=5.5V
Vcc=4.5V
100
50
0
-40
-20
0
20
40
60
80
Temperature ['C]
Turn-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
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
9
Preliminary
CM3512
CALIFORNIA MICRO DEVICES
Normaliz ed Overcurrent indicator trip point
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]
© 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
CM3512
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
11
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