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