19-1544; Rev 2; 09/07 USB Current-Limited Switch in Pin-Compatible Package The MAX1607 is a current-limited 60mΩ switch with built-in fault blanking. Its accurate, preset 0.7A to 1.0A current limit makes it ideal for USB applications. Its low quiescent supply current (14µA) and standby current (1µA) conserve battery power in portable applications. The MAX1607 operates with inputs from +2.7V to +5.5V, making it ideal for both 3V and 5V systems. An overcurrent signal (OC) notifies the microprocessor that the internal current limit has been reached. A 10ms overcurrent-blanking feature allows momentary faults (such as those caused when hot-swapping into a capacitive load) to be ignored, thus preventing false alarms to the host system. This blanking also prevents an OC signal from being issued when the device is powering up. The MAX1607 has several safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. The device also has accurate internal current-limiting circuitry to protect the input supply against overload. The MAX1607 is a pin-compatible upgrade to Texas Instruments’ TPS2014, TPS2015, and TPS2041 for USB applications. The same die is available in a space-saving 10-pin µMAX® package (MAX1693) and can be used for next-generation designs. The MAX1694 is similar to the MAX1693, but it has a built-in latch that turns off the power switch in case of a long-term shortcircuit condition. The MAX1607 is also offered in a 10-pin TDFN package (not pin compatible with Texas Instruments TPS2014, TPS2015, and TPS2041 for USB applications). Applications Notebook Computers USB Hubs USB Ports Docking Stations Pin Configurations Features ♦ SO Package is Pin Compatible with TPS2014, TPS2015, and TPS2041 ♦ Accurate Current Limit (0.7A min, 1.0A max) ♦ Guaranteed 0.75A Short-Circuit Protection ♦ 10ms Internal OC Blanking Timeout ♦ No Overcurrent (OC) Signal During Power-Up ♦ 125mΩ max High-Side MOSFET ♦ 500mA Continuous Current ♦ Short-Circuit and Thermal Protection with Overcurrent Logic Output ♦ 1ms Start-Up Time ♦ Undervoltage Lockout ♦ 14µA Quiescent Supply Current ♦ 1µA max Standby Supply Current ♦ +2.7V to +5.5V Supply Range ♦ UL Recognized #E211935 Ordering Information PART TEMP RANGE MAX1607ESA -40°C to +85°C 8 SO MAX1607ETB+ -40°C to +85°C 10 TDFN-EP* OUT 7 OUT 3 6 OUT EN 4 5 OC IN 2 Typical Operating Circuit INPUT +2.7V TO +5.5V OUTPUT OC OFF ON SO Pin Configurations continued at end of data sheet. OUT MAX1607 MAX1607 IN S8-5 T1033-1 +Denotes a lead-free package. IN 8 PKG CODE *EP = Exposed paddle. TOP VIEW GND 1 PINPACKAGE EN GND µMAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX1607 General Description MAX1607 USB Current-Limited Switch in Pin-Compatible Package ABSOLUTE MAXIMUM RATINGS IN, EN, OC to GND .....................................................-0.3 to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Maximum Switch Current.........................1.2A (internally limited) OUT Short-Circuit to GND ..........................................Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW 10-Pin TDFN (derate 18.5mW/°C above +70°C) .......1481mW Operating Temperature Range (extended) .........-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = +5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V OPERATING CONDITION Input Voltage 2.7 VIN POWER SWITCH Switch Static Drain-Source On-State Resistance TA = +25°C RDS(ON) TA = 0°C to +85°C Switch Turn-On Time tON ILOAD = 400mA Switch Turn-Off Time tOFF ILOAD = 400mA 60 VIN = 4.4V to 5.5V 90 125 VIN = 4.4V to 5.5V VIN = 3V 3 mΩ 72 150 80 200 µs 6 20 µs ENABLE INPUT (EN) EN High-Level Input Voltage VIH EN Low-Level Input Voltage VIL VIN = 2.7V to 3.6V 2.0 VIN = 3.7V to 5.5V 2.4 V VIN = 2.7V to 5.5V EN Input Current V EN = VIN or GND Start-Up Time VIN = 5V, COUT = 150µF from EN driven low to 50% full VOUT -1 0.8 V +1 µA 1 ms CURRENT LIMIT Overload Output Current Short-Circuit Output Current ILIMIT ISC 700 850 1000 mA 500 700 mA 0.001 1 µA Timer not running 14 25 Timer running 35 Force VOUT to 4.5V OUT shorted to GND SUPPLY CURRENT Supply Current, Low-Level Input Supply Current, High-Level Input V EN = VIN = VOUT = 5.5V IQ V EN = GND, IOUT = 0 V EN = VIN = 5.5V, VOUT = GND Supply Leakage Current 0.01 TA = +25°C 2 15 TA = 0°C to +85°C µA µA UNDERVOLTAGE LOCKOUT Undervoltage Lockout UVLO Rising edge, 100mV hysteresis 2.0 2.4 2.6 V OVERCURRENT (OC) OC Output Low Voltage VOL OC Off-State Current OC Blanking Timeout Period ISINK = 1mA, VIN = 3V VIN = V OC = 5V tBL From overcurrent condition to OC assertion 7 10 0.4 V 1 µA 13 ms THERMAL SHUTDOWN Thermal Shutdown Threshold 2 +165 _______________________________________________________________________________________ °C USB Current-Limited Switch in Pin-Compatible Package MAX1607 ELECTRICAL CHARACTERISTICS (VIN = +5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V OPERATING CONDITION Input Voltage 3.0 VIN POWER SWITCH Switch Static Drain-Source On-State Resistance RDS(ON) VIN = 4.4V to 5.5V 125 VIN = 3V 150 Switch Turn-On Time tON ILOAD = 400mA Switch Turn-Off Time tOFF ILOAD = 400mA 1 mΩ 200 µs 20 µs ENABLE INPUT (EN) EN High-Level Input Voltage VIH EN Low-Level Input Voltage VIL EN Input Current VIN = 3.0V to 3.6V 2.0 VIN = 3.7V to 5.5V 2.4 V 0.8 V V EN = VIN or GND -1 +1 µA Force VOUT to 4.5V 640 1060 mA 750 mA V EN = VIN = VOUT = 5.5V 2 µA V EN = GND, IOUT = 0, timer not running 25 µA V EN = VIN = 5.5V, VOUT = GND 15 µA 2.9 V VIN = 3.0V to 5.5V CURRENT LIMIT Overload Output Current Short-Circuit Output Current ILIMIT ISC OUT shorted to GND SUPPLY CURRENT Supply Current, Low-Level Input Supply Current, High-Level Input IQ Supply Leakage Current UNDERVOLTAGE LOCKOUT Undervoltage Lockout OVERCURRENT (OC) OC Output Low Voltage UVLO VOL OC Off-State Current OC Blanking Timeout Period Rising edge, 100mV hysteresis 2.0 ISINK = 1mA, VIN = 3V VIN = V OC = 5V tBL From overcurrent condition to OC assertion 6 0.4 V 1 µA 14 ms Note 1: Specifications to -40°C are guaranteed by design, not production tested. Note 2: TDFN package parts are 100% production tested at TA = +25°C. Specifications over operating temperature are guaranteed by design. _______________________________________________________________________________________ 3 Typical Operating Characteristics (VIN = +5V, TA = +25°C, unless otherwise noted.) 10 8 6 4 14 VIN = 3V 13 12 11 9 1 3 4 5 6 1 0.1 0.01 -40 -20 0 20 40 60 80 100 INPUT VOLTAGE (V) TEMPERATURE (°C) 0 20 40 60 TEMPERATURE (°C) OFF SWITCH CURRENT vs. TEMPERATURE NORMALIZED ON-RESISTANCE vs. TEMPERATURE NORMALIZED OUTPUT CURRENT vs. OUTPUT VOLTAGE 1.4 IOUT = 425mA 1.2 NORMALIZED RON 100 10 1 1.0 0.8 0.6 0.4 0.1 -40 0.2 -20 0 20 40 60 80 -40 100 0.8 SHORT-CIRCUIT CURRENT 0.6 0.4 0.2 -20 0 20 40 60 80 0 100 2 3 4 5 TURN-ON TIME vs. TEMPERATURE TURN-OFF TIME vs. TEMPERATURE FAULT-BLANKING TIMEOUT vs. TEMPERATURE VIN = 5V 6 120 100 80 VIN = 5V tOFF (μs) 5 4 VIN = 3V 3 60 2 40 12 10 8 6 4 20 1 2 0 0 0 -20 0 20 40 60 TEMPERATURE (°C) 80 100 -40 -20 0 20 40 60 TEMPERATURE (°C) 80 100 6 MAX1607-09 ILOAD = 425mA FAULT-BLANKING TIMEOUT (ms) VIN = 3V 7 MAX1607-08 OUTPUT VOLTAGE (V) ILOAD = 425mA -40 1 TEMPERATURE (°C) 140 100 ILIMIT 1.0 TEMPERATURE (°C) MAX1607-07 -40 80 0 0 0.01 -20 1.2 NORMALIZED OUTPUT CURRENT VEN = VIN MAX1607-05 1000 2 MAX1607-04 0 OFF SWITCH CURRENT (nA) 10 MAX1607-06 0 4 VEN = VIN 10 2 160 MAX1607-03 15 OFF SUPPLY CURRENT (nA) VIN = 5V QUIESCENT CURRENT (μA) QUIESCENT CURRENT (μA) 12 100 MAX1607-02 VEN = GND IOUT = 0 14 16 MAX1607-01 16 OFF SUPPLY CURRENT vs. TEMPERATURE QUIESCENT CURRENT vs. TEMPERATURE QUIESCENT CURRENT vs. INPUT VOLTAGE tON (μs) MAX1607 USB Current-Limited Switch in Pin-Compatible Package VIN = 3V OR 5V IOUT = 850mA -40 -20 0 20 40 60 TEMPERATURE (°C) _______________________________________________________________________________________ 80 100 USB Current-Limited Switch in Pin-Compatible Package CURRENT-LIMIT AND OC RESPONSE MAX1607-12 MAX1607-11 MAX1607-10 CH1 SWITCH TURN-ON TIME CURRENT-LIMIT RESPONSE CH1 CH1 CH2 CH2 CH2 CH3 CH3 CH3 CH4 CH4 CH4 2ms/div 20μs/div 10μs/div CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 200mA/div CH1 = VIN, 200mV/div, AC-COUPLED CH2 = VOUT, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 1A/div START-UP TIME (TYPICAL USB APPLICATION) MAX1607-13 SWITCH TURN-OFF TIME MAX1607-14 CH1 = VIN, 200mV/div, AC-COUPLED CH2 = VOUT, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 500mA/div CH1 CH1 CH2 CH2 FULL CURRENT LIMIT CHARGES CAPACITOR RESISTOR LOAD CURRENT CH3 CH3 SHORT-CIRCUIT CURRENT LIMIT CH4 CH4 1μs/div CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 200mA/div 1ms/div VIN = 5V, RL = 15Ω, CL = 150μF CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = IIN, 500mA/div CH4 = VOC, 5V/div _______________________________________________________________________________________ 5 MAX1607 Typical Operating Characteristics (continued) (VIN = +5V, TA = +25°C, unless otherwise noted.) USB Current-Limited Switch in Pin-Compatible Package MAX1607 Pin Description PIN NAME FUNCTION SO TDFN 1 6 GND 2, 3 1, 3, 9 IN Input. P-channel MOSFET source. Connect all IN pins together and bypass with a 1µF capacitor to ground. 4 5 EN Active-Low Switch Enable Input. A logic-low turns on the switch. 5 7 OC Overcurrent Indicator Output. This open-drain output goes low when the device is in thermal shutdown or undervoltage lockout, or during a sustained (> 10ms) current-limit condition. 6, 7, 8 2, 4, 8, 10 OUT Switch Output. P-channel MOSFET drain. Connect all OUT pins together and bypass with a 0.1µF capacitor to ground. — — EP Exposed Paddle (TDFN Package Only). Internally connected to GND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. Ground These switches are not bidirectional; therefore, the input voltage must be higher than the output voltage. P IN OUT P OC N REPLICA AMPLIFIER Thermal Shutdown ON The MAX1607 has a thermal shutdown feature. The switch turns off and the OC output goes low immediately (no overcurrent blanking) when the junction temperature exceeds +165°C. When the MAX1607 cools 20°C, the switch turns back on. If the fault short-circuit condition is not removed, the switch will cycle on and off, resulting in a pulsed output. P ON 10ms TIMER Continuous Short-Circuit Protection The MAX1607 is a short-circuit-protected switch. In the event of an output short-circuit condition, the current through the switch is foldback-current-limited to 500mA continuous. MAX1607 CURRENT-LIMIT AMPLIFIER 1.24V OC Indicator Detailed Description The MAX1607 provides an overcurrent output (OC). A 100kΩ pull-up resistor from OC to IN provides a logic control signal. This open-drain output goes low when any of the following conditions occur: • The input voltage is below the 2.4V undervoltagelockout (UVLO) threshold. • The die temperature exceeds the thermal shutdown temperature limit of +165°C. • The device is in current limit for greater than 10ms. The MAX1607 P-channel MOSFET power switch limits output current to 0.7A min and 1.0A max. When the output current is increased beyond the current limit (ILIMIT), the current also increases through the replica switch (IOUT / 6500). The current-limit error amplifier compares the voltage to the internal 1.24V reference and regulates the current back to the ILIMIT (Figure 1). The MAX1607 features 10ms overcurrent blanking. Blanking allows brief current-limit faults, including momentary short-circuit faults that occur when hotswapping a capacitive load, and also ensures that no OC is issued during power-up. When a load transient causes the device to enter current limit, an internal HOT EN CONTROL CIRCUITRY GND Figure 1. Functional Diagram 6 OC Blanking _______________________________________________________________________________________ USB Current-Limited Switch in Pin-Compatible Package Applications Information Input Capacitor To limit the input voltage drop during momentary output short-circuit conditions, connect a capacitor from IN to GND. A 1µF ceramic capacitor will be adequate for most applications; however, higher capacitor values will further reduce the voltage drop at the input (Figure 2). Output Capacitor Connect a 0.1µF capacitor from OUT to GND. This capacitor helps to prevent inductive parasitics from pulling OUT negative during turn-off. Layout and Thermal Dissipation Important: Optimize the switch response time to output short-circuit conditions by keeping all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm away). All IN and OUT pins must be connected with short traces to the power bus. Wide power-bus planes will provide superior heat dissipation through the MAX1607’s IN and OUT pins. Under normal operating conditions, the package can dissipate and channel heat away. Calculate the maximum power dissipation as follows: P = (ILIMIT)2 ✕ RON where ILIMIT is the preset current limit (1.0A max) and RON is the on-resistance of the switch (125mΩ max). When the output is short circuited, foldback-current limiting activates and the voltage drop across the switch equals the input supply. The power dissipated across the switch increases, as does the die temperature. If the fault condition is not removed, the thermal-overload-protection circuitry activates (see Thermal Shutdown section). Wide power-bus planes connected to IN and OUT and a ground plane in contact with the device will help dissipate additional heat. Pin Configurations (continued) MAX1607 100k OVERCURRENT OUTPUT TOP VIEW GND 0.1μF* 1μF OC OUTPUT OUT OUT IN IN OUT INPUT 10 9 8 7 6 OC MAX1607 OFF EN *USB SPECIFICATIONS REQUIRE A HIGHER VALUE CAPACITOR. 3 IN 4 5 EN 2 OUT 1 OUT + GND IN ON EP* *EP = EXPOSED PADDLE Figure 2. Typical Application Circuit Chip Information TRANSISTOR COUNT: 715 _______________________________________________________________________________________ 7 MAX1607 counter starts. If the load fault persists beyond the 10ms overcurrent-blanking timeout, the OC output asserts low. Ensure that the MAX1607 input is adequately bypassed to prevent input glitches from triggering spurious OC outputs. Input voltage glitches less than 150mV will not cause a spurious OC output. Loadtransient faults less than 10ms (typ) will not cause an OC output assertion. Only current-limit faults are blanked. Die overtemperature faults and input voltage droops below the UVLO threshold will cause an immediate OC output. Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS MAX1607 USB Current-Limited Switch in Pin-Compatible Package 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D A B e C 0∞-8∞ A1 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 8 _______________________________________________________________________________________ REV. B 1 1 USB Current-Limited Switch in Pin-Compatible Package 6, 8, &10L, DFN THIN.EPS _______________________________________________________________________________________ 9 MAX1607 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX1607 USB Current-Limited Switch in Pin-Compatible Package Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.10 T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF A1 0.00 0.05 T1033-1 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF L 0.20 0.40 T1033-2 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF k 0.25 MIN. T1433-1 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF A2 0.20 REF. T1433-2 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF Revision History Pages changed at Rev 2: 1, 2, 3, 6, 7–10 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.