MAX1562/MAX1562H/MAX1563 19-2631 Rev 2 2/10 Programmable 4A USB Current-Limited Switches with Autoreset and Fault Blanking General Description Features The MAX1562/MAX1562H/MAX1563 single current- Programmable Current Limit (1A to 4A) with limited switches provide up to 4A to power up to eight Resistor USB ports. They operate from a 4V to 5.5V input supply and consume only 40A of quiescent current Autoreset Feature Saves System Power when operating and only 3A in shutdown. 20ms Fault-Blanking Circuitry The MAX1562/MAX1562H/MAX1563s autoreset feature latches the switch off if the output is shorted, thereby Active-High/Low Control Logic saving system power. When the short is removed, the switch is reactivated. A fault-blanking feature enables the Fault-Indicator Output circuit to ignore momentary faults, such as those caused Thermal-Overload Protection when hot swapping a capacitive load, preventing false alarms to the host system. Fault blanking also prevents Smaller 4mm x 4mm Thin QFN Package (MAX1563) fault signals from being issued when the device powers up the load. 3A Shutdown Current The MAX1562/MAX1562H/MAX1563 provide several safety features to protect the USB port. Built-in thermal- overload protection turns off the switch when the die Ordering Information temperature exceeds +160C. Accurate internal cur- rent-limiting circuitry protects the input supply against PART TEMP RANGE PIN-PACKAGE both overload and short-circuit conditions. An open- MAX1562ESA+ -40C to +85C 8 SO drain fault signal (FAULT) notifies the microprocessor MAX1562HESA+ -40C to +85C 8 SO when a thermal-overload, current-limit, undervoltage MAX1563ETC+ -40C to +85C 12 TQFN-EP* lockout (UVLO), or short-circuit fault occurs. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX1562 has an active-low ON, and the *EP = Exposed pad. MAX1562H has an active-high ON enable input. The MAX1563 has a selectable active-high or active-low logic-controlled enable. The current limit is pro- grammed from 1A to 4A using a resistor. The MAX1562/MAX1562H are available in 8-pin SO Typical Operating Circuit packages and are pin-compatible upgrades to the MIC2545A/MIC2549A. The MAX1563 provides the same features and higher current performance in a smaller 12-pin (4mm x 4mm) Thin QFN package. These devices operate over an extended temperature range (-40C to +85C). An evaluation kit is available to speed IN designs. FAULT INPUT IN 4V TO 5.5V Applications MAX1562 Notebook Computers MAX1562H Desktop Computers MAX1563 ON USB Ports and Hubs ACTIVE-HIGH/ACTIVE-LOW USB MAX1563 PDAs and Palmtop Computers OUT SEL SELECTABLE PORT ONLY Docking Stations ISET OUT GND Pin Configurations appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEProgrammable 4A USB Current-Limited Switches with Autoreset and Fault Blanking ABSOLUTE MAXIMUM RATINGS IN, ON, ON, ISET, SEL, OUT to GND.......................-0.3V to +6V 12-Pin Thin QFN (4mm x 4mm) (derate 16.9mW/C above +70C).............................1350mW FAULT to GND.............................................-0.3V to (V + 0.3V) IN IN to OUT..................................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C Junction Temperature......................................................+150C OUT Maximum Continuous Switch Current ............................5A Storage Temperature Range .............................-65C to +150C FAULT DC Current..............................................................10mA Continuous Power Dissipation Lead Temperature (soldering, 10s) .................................+300C 8-Pin SO (derate 5.9mW/C above +70C)..................471mW 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 = +5V, C = 1F, C = 4.7F, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) IN IN OUT A A PARAMETER SYMB O L CONDITIONS MINTYPMAXUNITS Supply Voltage Range V 4.0 5.5 V IN Switch On-Resistance R 26 50 m ON Standby Supply Current Switch disabled 3 10 A Quiescent Supply Current I Switch enabled, I = 0A 40 80 A IN OUT OUT Off-Leakage Current I Switch disabled, V = 0V 0.02 10 A LKG OUT Undervoltage-Lockout Threshold V Rising edge, 3% hysteresis 2.9 3.4 3.8 V UVLO MAX1563 1 4 Continuous Current-Limit Adjust A Range MAX1562/MAX1562H 1 3 R = 4.22k (MAX1563 only) 3.2 4 4.8 ISET R = 5.76k 2.4 3 3.6 V - V ISET IN OUT Continuous Current Limit I A LIM = 0.5V R = 8k 1.7 2.1 2.6 ISET R = 12k 1.1 1.4 1.7 ISET 4.9 A(peak) R = 4.22k (MAX1563 only) ISET 1.6 A(RMS) 2.5 3.6 4.7 A(peak) V = 0V, OUT Short-Circuit Current Limit I R = 5.76k LIM ISET I pulsing OUT 1.4 A(RMS) 1.2 1.7 2.3 A(peak) R = 12k ISET 0.4 A(RMS) Short-Circuit Detect Threshold (Note 1) 1 V Continuous Current-Limit From continuous current-limit condition to 10 20 35 ms Blanking Timeout Period FAULT asserted Short-Circuit Blanking Timeout From short-circuit current-limit condition to 7.5 18 35 ms Period FAULT asserted R = 2, C = 4.7F OUT OUT Turn-On Delay t 0.5 1.2 4.0 ms ON (from ON to 10% of V ) OUT R = 2, C = 4.7F OUT OUT Output Rise Time t 2.5 ms RISE (from 10% to 90% of V ) OUT R = 2, C = 4.7F OUT OUT Turn-Off Delay t 0.1 3 ms OFF (from ON to 90% of V ) OUT 2 MAX1562/MAX1562H/MAX1563