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MAX1564ETE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1564ETE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 11 page Triple 1.2A USB Switch in 4mm x 4mm Thin QFN 8 _______________________________________________________________________________________ current limiting. When VOUT_ is greater than 1V, the device operates in continuous current-limit mode and limits output current to a user-programmable level. When VOUT_ is less than 1V, the device operates in short-circuit current-limit mode and pulses the output current to levels that are 30% (typ) higher than the selected current limit. When either fault condition per- sists for 20ms (typ), the output turns off and its fault flag is asserted. The output automatically restarts 20ms after the short or overload is removed. Auto-Restart Mode The MAX1564 detects short-circuit removal by sourcing 25mA from the output and monitoring the output volt- age. When the voltage at the output exceeds 0.5V for 20ms, the fault flag resets, the output turns back on, and the 25mA current source turns off. Active loads are not expected to draw measurable current when sup- plied with less than 0.5V. The MAX1564 can also be reset from a fault by toggling the ON_ input for the offending channel. Reverse Current Blocking The USB specification does not allow an output device to source current back into the USB port. However, the MAX1564 is designed to safely power noncompliant devices. During normal operation with the channel enabled, the IC immediately turns off the switch if the output voltage rises above the input voltage sufficiently to create a reverse current in excess of 0.9A (typ). If the output voltage condition persists for longer than 20ms (typ), the switch remains off and the FLT_ flag is assert- ed. When any channel is disabled, the output is switched to a high-impedance state, blocking reverse current flow from the output back to the input. Thermal Shutdown Independent thermal shutdown of each channel per- mits delivering power to normal loads even if one load has a fault condition. The thermal limit does not have the 20ms fault blanking but sets the same fault latch that is used for other faults. Exiting this latched state is described in the Auto-Restart Mode section. Fault Indicators and Fault Blanking The MAX1564 provides an independent open-drain fault output (FLT_) for each switch. Connect FLT_ to IN_ through a 100k Ω pullup resistor for most applications. FLT_ asserts low when any of the following conditions occur: • The input voltage is below the UVLO threshold. • The switch junction temperature exceeds the +160°C thermal-shutdown temperature limit. • The switch is in current-limit or short-circuit current- limit mode after the fault-blanking period (20ms typ) expires. • The reverse current condition exists after the fault- blanking period expires. The FLT_ output goes high impedance after a 20ms delay once the fault condition is removed. Ensure that the MAX1564 input bypass capacitance prevents glitches from triggering the FLT_ outputs. To differenti- ate large capacitive loads from short circuits or sus- tained overloads, the MAX1564 has an independent fault-blanking circuit for each switch. When a load tran- sient causes the output to enter current limit, an internal counter monitors the duration of the fault. For load faults exceeding the 20ms fault-blanking time, the switch turns off, FLT_ asserts low, and the output enters auto-restart mode (see the Current-Limit Fault Protection and Auto-Restart Mode sections). Only cur- rent-limit and short-circuit faults are blanked. Thermal- overload faults and input voltages below the UVLO threshold immediately turn off the offending output and assert FLT_ low. Fault blanking allows the MAX1564 to handle USB loads that might not be fully compliant with USB specifications. The MAX1564 successfully powers USB MAX1564 INA 1 3 4 2 5 16 15 14 6 11 9 10 12 8 7 13 INB INC VCC SEL OUTA OUTB OUTC ONA ONB ONC FLTA FLTB FLTC R2 100k Ω R3 100k Ω R1 26.1k Ω R4 100k Ω C2 1 µF C1 0.1 µF C3 1 µF C4 1 µF SETI INPUT 2.75V TO 5.5V USB PORT A USB PORT B USB PORT C GND ACTIVE-HIGH/ ACTIVE-LOW SELECT INPUT Figure 1. Typical Application Circuit |
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