Preliminary CM3513 CALIFORNIA MICRO DEVICES USB 2.4A Overcurrent Switch Features • • • • • • • • Pin Diagram High-side high current switch with active low Enable Up to 2.4A continuous current on the output Over-current limits at 2.4A min 10msec min fault blanking delay on OC# output 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 GND VCC VCC VOUT TOP VOUT SOIC-8 VOUT OC# EN# Applications • Desktop PCs, Notebooks and Set-Top-Boxes Product Description California Micro Devices’ CM3513 is a USB overcurrent power switch that provides power to four USB ports. The device has a power switch that provides the VBUS voltage at the USB output ports with minimal voltage drop. When the EN# pin is logic low, the power switch is ON, and VCC is connected to the output VOUT. When the EN# pin is logic high, the power switch is OFF, and no power is available at the output. The power switch has full over-current protection. Whenever the current limit of the switch is exceeded, the device enters a constant-current mode, where the output voltage is progressively reduced to prevent the current from increasing further. The OC# output becomes active low only if the overcurrent condition exceeds at least 10ms. This fault blanking delay prevents false alarms from being reported to the host USB controller. Typical Application Circuit VCC VOUT VCC VOUT VCC VOUT EN# VBUS VBUS 2 USB Ports 2 USB Ports OC# Simplified Electrical Schematic If the overcurrent condition is severe enough that the part heats up to the thermal limit TMAX, then the switch will be turned off and the temperature cools down. At TMIN the switch then turns on again, and the device heats up again, and so on, until the fault is removed. The CM3513 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. GND EN# Charge Pump VCC Over current protect © 2003 California Micro Devices Corp. All rights reserved. 11/10/03 430 N. McCarthy Blvd, Milpitas, California 95035 OC# VOUT C0970500 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 1 Preliminary CM3513 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 VCC 0 to 2400 Symbol UVLO RSW RSWa RSWb VOUT ILIM tFBD TMAX TMIN IRCC 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 2400mA; VCC = 5V, 0.07 0.1 T = 25°C Switch ON-Resistance ILOAD = 0 to 2400mA; VCC = 5V, 0.125 T = 0 to +85°C Switch ON-Resistance ILOAD = 0 to 2400mA; VCC = 5V, 0.125 T = -40 to +85°C Output Voltage ILOAD = 1000mA, VCC = 5.0V, 4.9 EN#=0V, T=25°C Over-current limit 2400 3000 3800 VCC = 5V T=25°C 10 20 30 Time delay from overcurrent detection to OC# output indication (fault blanking delay) Temperature at which switch 150 turns off during overcurrent Temperature at which switch 125 turns on, after cooling from TMAX 1 Reverse leakage from output to VCC = 0V, VOUT = 5V, EN# = high, input T=25°C Operating supply current EN# = low 95 Quiescent current 1 EN# = high T=25°C 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 0.4 UNIT V Ω Ω Ω V mA ms °C °C µA µA µA V V uA V Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES Pin Functions VCC is the power source. Pins 2 & 3 must be connected together externally EN# is the active low logic input pin that is used to control the power switch. Set EN# high (>2V) to deselect VOUT, and set EN# low (<0.8V) to select VOUT. VOUT provides the power for the loads. The internal MOSFET switch is designed for very low voltage drops from the voltage input pins at the full rated current. Pins 6, 7 & 8 must be connected together externally. OC# is an active low open-drain output voltage, Current loads of up to 2.4A are allowed. Current loads above 2.4A may cause the constant-current limiting circuit to operate – reducing the output voltage. indicating an overcurrent fault condition has been detected at VOUT. There is a built-in 10msec (min.) fault blanking delay after the overcurrent fault condition has been detected, before this output becomes active low. The OC# output deasserts only when both the overcurrent condition stops and when the voltage drop across the switch is less than 1V. An external pull-up resistor of 10k - 100k is required if the OC# output is used. Continuous over-current loads will cause the part’s internal temperature to rise. If the internal temperature exceeds 150’C then the switch immediately turns off. Once the part has cooled to 125’C then the switch automatically turns on again. 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 VCC EN# OC# VOUT 7 8 VOUT VOUT GND is the negative reference for all voltages. Pin Descriptions Description Negative reference for all voltages. Power Primary High current Positive supply input. Power supply input connected to pin 2 Active low enable pin Active low when VOUT is in overcurrent mode. External pull-up resistor required. Output connected to pins 7 and 8 Output connected to pins 6 and 8 Output connected to pins 6 and 7 STANDARD PART ORDERING INFORMATION 1 Pins Package Ordering Part Number Part Marking 8 SOIC CM3513-04SN CM3513-04SN Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES Response to Momentary Overcurrent Fault >2400mA <2300mA 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 >2400mA IOUT Re-powers when temperature drops to 125’C VOUT drops to reduce IOUT Total powerdown when over-temperature limit reached VOUT OC# OC# goes active after 10ms (min) 20ms (typ.) delay OC# stays low 150’C TMAX = 150’C Die Temp. TMIN = 125’C Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES Typical Operating characteristics Resistance [milliohms] 90 CM3513 On-resistance 85 80 75 Vcc=5.5V 70 Vcc=5.0V 65 Vcc=4.5V Vcc=4.0V 60 55 50 -40 -20 0 20 40 60 80 100 120 Temperature ['C] CM3513 V OUT - IOUT characteristic 6 5 4 V OUT [V] 3 2 1 0 0 1 2 3 4 5 6 IOUT [A] Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES CM3513 Quiescent supply current vs. l lt 120 100 I CC 80 [uA] 60 40 20 0 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 V CC [V] CM3513 Supply current [EN#=0V] 160 140 120 100 Current [uA] 80 Vcc=5.0V Vcc=4.0V 60 40 20 0 -40 -20 0 20 40 60 80 100 120 Temperature ['C] CM3513 Supply current [EN#=logic'1'] 2.5 2 1.5 Current [uA] Vcc=5.0 V Vcc=4.0 V 1 0.5 0 -40 -20 0 20 40 60 80 100 120 140 Temperature ['C] Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 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 CC [V] Fault Blanking Period 25 Time [milliseconds] 20 15 Vcc=5.0V 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] Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES Turn-on time 140 120 Time [usec] 100 80 Vcc=5.5V Vcc=4.5V 60 40 20 0 -40 -20 0 20 40 60 80 Temperature ['C] Turn-off time 5.0 4.0 3.0 Vcc=5.5V Vcc=4.5V Time [usec] 2.0 1.0 0.0 -40 -20 0 20 40 60 80 Temperature ['C] Turn-on time v s. VCC 140 120 Time [usec] 100 80 60 40 Cout=0.1u 20 Cout=1u 0 4 4.5 5 5.5 V CC [V] Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 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 ] 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] Note: This is a preliminary datasheet only. Data subject to change at any time. © 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 CM3513 CALIFORNIA MICRO DEVICES SOIC-8 Package Dimensions Note: This is a preliminary datasheet only. Data subject to change at any time. © 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