MAX1812 19-1865 Rev 0 11/00 Dual USB Switch with Fault Blanking General Description Features The MAX1812 is a dual current-limited switch specifi- Dual USB Switch in Tiny 10-Pin MAX Package cally made for USB applications. Each channel is guar- Guaranteed 500mA Load per Channel anteed to supply 500mA and meets USB specifications. The MAX1812s low quiescent supply current (45A) Built-In 20ms Fault Blanking and shutdown current (3A) conserve battery power in Compliant to USB Specifications portable applications. The MAX1812 has multiple safety features to ensure +4.0V to +5.5V Input Voltage Range that the USB port is protected. Built-in thermal-overload 45A Quiescent Current protection limits power dissipation and junction temper- ature. The device also has accurate internal current-lim- 3A Shutdown Current iting circuitry to protect the input supply against both Independent Shutdown Control overload and short-circuit conditions. Independent fault signals (FAULTA and FAULTB) notify the microproces- Independent FAULT Indicator Outputs sor when a thermal-overload, current limit, undervoltage Thermal-Overload Protection lockout, or short-circuit fault occurs. A 20ms fault-blank- ing feature enables the circuit to ignore momentary UL Listing Pending faults, such as those caused when hot-swapping a capacitive load, thereby preventing false alarms to the host system. The MAX1812 is available in a space-saving 10-pin MAX package. For single versions of this device, refer to the MAX1693, MAX1694, and MAX1607 data sheets. Applications Ordering Information USB Ports PART TEMP. RANGE PIN-PACKAGE USB Hubs MAX1812EUB -40C to +85C 10 MAX Notebook Computers Desktop Computers PDAs and Palmtop Computers Docking Stations Typical Operating Circuit Pin Configuration TOP VIEW USB INA OUTA PORT A IN INPUT INB 4.0V TO 5.5V ONA 1 10 FAULTA INA 2 9 OUTA MAX1812 MAX1812 IN 3 8 GND USB FAULTA OUTB PORT B INB 4 7 OUTB FAULTB ONB 5 6 FAULTB ONA ONA MAX ONB ONB GND Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Dual USB Switch with Fault Blanking ABSOLUTE MAXIMUM RATINGS IN, INA, INB, ONA, ONB, OUTA, OUTB to GND......-0.3V to +6V Continuous Power Dissipation (T = +70C) A 10-Pin MAX (derate 5.6mW/C above +70C) ............444mW FAULTA, FAULTB to GND .........................-0.3V to (V + 0.3V) IN INA, IN to OUTA INB, IN to OUTB..........................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C Junction Temperature......................................................+150C OUTA, OUTB Maximum Continuous Switch Current (per channel, internally limited) .........................................1.2A Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C FAULTA, FAULTB Current .................................................20mA 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 (V = V = V = 5V, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C) (Note 1) IN INA INB A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range 4.0 5.5 V T = +25C, each switch 75 105 A Switch On-Resistance R m ON T = -40C to +85C, each switch 135 A Standby Supply Current Both switches disabled 3 10 A Quiescent Supply Current Both switches enabled, I = I = 0 45 100 A OUTA OUTB Switches disabled, V = V = 0, OUTA OUTB 0.002 1 T = +25C A OUT Leakage Current A Switches disabled, V = V = 0, OUTA OUTB 10 T = -40C to 85C A U nd er volta ge Lockout Thr eshol d UVLO Rising edge, 3% hysteresis 3.0 3.4 3.8 V Continuous Load Current 500 mA Continuous Current Limit ILIM V - V = 0.5V 0.6 0.9 1.2 A IN OUT 0.8 1.2 1.6 A(pe ak) Short-Circuit Current Limit ISHORT V = 0 (I pulsing) OUT OUT 0.35 A RMS Short-Circuit Detect Threshold (Note 2) 1 V Continuous Current-Limit From continuous current-limit condition to 10 20 35 ms Blanking Timeout Period FAULT assertion Short-Circuit Blanking Timeout From short-circuit current-limit condition to 7.5 18 35 ms Period FAULT assertion R = 10 , C = 1 F does not include OUT OUT Turn-On Delay 0.5 1.2 4.0 ms rise time (from ON to 10% of V ) OUT R = 10 , C = 1 F, from 10% to OUT OUT Output Rise Time 2.5 ms 90% of V OUT R = 10 , C = 1 F does not include OUT OUT Turn-Off Delay from ON 0.8 3 ms fall time (from ON to 90% of V ) OUT C = 1 F, R = 10 , from 90% to 10% OUT OUT Output Fall Time 2.5 ms of V OUT Thermal Shutdown Threshold 15C hysteresis 160 C 2 MAX1812