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LTC4362-2 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4362-2 Datasheet(HTML) 6 Page - Linear Technology |
6 / 14 page LTC4362-1/LTC4362-2 6 436212fa BLOCK DIAGRAM Mobile devices like cell phones and MP3/MP4 players have highly integrated subsystems fabricated from deep submicron CMOS processes. The small form factor is accompanied by low absolute maximum voltage ratings. The sensitive electronics are susceptible to damage from transient or DC overvoltage conditions from the power supply. Failures or faults in the power adaptor can cause an over- voltage event. So can hot-plugging an AC adaptor into the power input of the mobile device (see Application Note 88). Today’s mobile devices derive their power supply or recharge their internal batteries from multiple alternative inputs like AC wall adaptors, car battery adaptors and USB ports. A user might unknowingly plug in the wrong adap- tor, damaging the device with a high or even a negative power supply voltage. The LTC4362 protects low voltage electronics from these overvoltage conditions by controlling an internal N-chan- nel MOSFET configured as a pass transistor. At power-up (VIN > 2.1V), a start-up delay cycle begins. Any overvolt- age condition causes the delay cycle to continue until a safe voltage is present. When the delay cycle completes, an internal high-side switch driver slowly ramps up the MOSFET gate, powering up the output at a controlled rate and limiting the inrush current to the output capacitor. CHARGE PUMP SENSE RESISTOR 31mΩ CONTROL OVERCURRENT COMPARATOR OVERVOLTAGE COMPARATOR 5μA 10μA 1.8M 200k 5.8V 5.8V 5.7V + – GATE HIGH COMPARATOR GATE HIGH THRESHOLD + – + – 500k 5.8V OUT GND ON PWRGD GATEP IN SENSE 436212 BD + – 1V + – 47mV OPERATION |
Similar Part No. - LTC4362-2_15 |
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Similar Description - LTC4362-2_15 |
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