AAT4670IHS-B1

AAT4670 Dual-Input, Dual-Output Load Switches General Description The AAT4670 SmartSwitch™ is part of the Analogic Tech Application Specific Power MOSFET (ASPM™) line of products. The AAT4670 consists of dual, independent, 1A current limited, slew rate controlled P-channel MOSFET power switches with a dedicated source and drain pin assigned to each switch. The internal circuitry automatically derives power from the higher of the two input power source pins with a low operating quiescent current of 18µA. In shutdown mode, the supply current decreases to less than 1µA. The switches operate with inputs ranging from 2.2V to 5.5V, making them ideal for 2.5V, 3V and 5V systems. The dual configuration permits integration of the load switch function for systems with two different power busses. Independent under voltage lockout circuits will shut down the corresponding switch if its input voltage falls below the under voltage lockout threshold. If the die temperature reaches the thermal limit, both switches thermal cycle off and on indefinitely without damage until the thermal condition is removed. An open drain FAULT output signals an over current or over temperature condition for each channel. Input logic levels are TTL compatible. The AAT4670 is available in 8 pin SOP, TSSOP or MSOP specified over -40 to 85 °C temperature range. Features • • • • • • • • • • • • SmartSwitch™ 2.2V to 5.5V input voltage range 1A current limit per channel 95mΩ typical RDS(ON) Fast transient response: • < 1µs response to short circuit Low 18µA quiescent current 1µA max with Switches off Slew rate controlled Thermal shutdown Fault flags with 3ms blanking Under voltage lockout Temp range -40 to 85ºC 8-pin SOP, TSSOP or MSOP packages Preliminary Information Applications • • • • • • Notebook Computer PDA, Subnotebook USB ports Peripheral ports Hot swap supplies Media bay Typical Application AAT4670 INA INB EN 7 6 1 INA INB EN GND OUTA OUTB FAULTA FAULTB 8 5 2 3 OUTA OUTB FAULTA FAULTB CINA 1µF GND CINB 1µF 4 COUTA 1µF COUTB 1µF GND 4670.2002.1.0.92 1 AAT4670 Dual-Input, Dual-Output Load Switches Pin Descriptions Pin # 1 2 3 4 5 6 7 8 Symbol EN FAULTA FAULTB GND OUTA INA INB OUTB Function Active-low Enable input (Logic low turns the switches on) Open drain output signals over-current for OUTA and over-temperature condition Open drain output signals over-current for OUTB and over-temperature condition Ground connection P-channel MOSFET drain channel A P-channel MOSFET source channel A P-channel MOSFET source channel B P-channel MOSFET drain channel B Pin Configuration SOP-8 TSSOP-8 8 7 2 MSOP-8 8 7 EN 1 2 3 4 FAULTA FAULTB GND 6 5 OUTB INB INA OUTA EN 1 2 FAULTA FAULTB GND 3 4 6 5 OUTB INB INA OUTA EN 1 2 8 7 FAULTA FAULTB GND 3 4 6 5 OUTB INB INA OUTA 1 1 1 2 2 2 4670.2002.1.0.92 AAT4670 Dual-Input, Dual-Output Load Switches Absolute Maximum Ratings Symbol VINA,B VOUTA,B VFAULTA,B IOUT TJ VESD TLEAD (TA=25°C unless otherwise noted) Value -0.3 to 6 -0.3 to 6 -0.3 to 6 Internally Limited -40 to 150 4000 300 Description INA or INB to GND OUTA or OUTB to GND FAULTA or FAULTB to GND Output Current Operating Junction Temperature Range ESD Rating1 - HBM Maximum Soldering Temperature (at Leads) Units V V V A °C V °C Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time. Note 1: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Thermal Characteristics Symbol ΘJA PD Description Maximum Thermal Resistance2 (SOP-8) Maximum Power Dissipation2 (SOP-8) Value 100 1.25 Units °C/W W Note 2: Mounted on a demo board. Electrical Characteristics -40 to 85°C temperature range) Symbol Description VIN IQ IQ(OFF) ISD(OFF) VUVLO RDS(ON) TCRDS ILIM t1 t2 t3 t4 VEN(L) VEN(H) IEN(SINK) tRESP VFAULTLOW ISINK Tblank TSD Operation Voltage Quiescent Current Off Supply Current Off Switch Current Undervoltage Lockout (VIN = 5V, TA = 25°C unless otherwise noted. Bold values designate Conditions VINA or VINB = 5V IOUTA = IOUTB = 0 EN = VIN, VINA=VINB =5V, OUTA, OUTB open EN = VIN, VINA=VINB =5V, VOUTA=VOUTB =0V VIN=5.0V VIN=3.0V VOUT < VIN - 0.5V VIN=5V, OUT=0 to 10%, RLOAD=20Ω VIN=5V, OUT=10% to 90%, RLOAD=20Ω VIN=5V, OUT=100% to 90%, RLOAD=20Ω VIN=5V, OUT=90% to 10%, RLOAD=20Ω VIN=2.7V to 5.5V3 VIN=2.7V to