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MAX4959 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4959 Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 17 page 
no blanking time for OVP, but the debounce time applies once the IN voltage falls below VOVLO but above VUVLO. When the voltage at IN is higher than VOVLO, the CB pin does not control P1. Correct Adapter (VUVLO < VIN < VOVLO) In this case, when the adapter is plugged in, the device goes through a 20ms (typ) debounce time and ensures that the voltage at IN is between VUVLO and VOVLO before P1 is turned on. In this state, the CB pin controls both P1 and P2. Low-Power Adapter or Glitch Condition If the adapter has the correct voltage but not enough power (incorrect low-power adapter), the MAX4959/ MAX4960 protect pFET P1 from oscillation. When the adapter is first plugged in, P1 is off so the voltage is cor- rect. When P1 is turned on after the debounce time, the low-power adapter is dragged down to below VUVLO. The device waits for a 10ms blanking time to make sure it is not a temporary glitch, and, if a fault still exists, it latches off P1. P1 does not turn on again until the adapter is unplugged (VIN<~0.75V) and plugged in again. This feature can work without the battery present High-Voltage OVP with Battery Switchover 6 _______________________________________________________________________________________ MAX4959 + - + - + - + - GATE2 CB GND UVS OVS VDD N2 N1 GATE1 N IN VSG + - + - LOGIC DIGITAL SUPPLY ANALOG SUPPLY BANDGAP UVLO OVLO UVLOINT POWER ON VDD UVLO VREF1 = 2V VREF2 = 0.7V POWER-ON RESET AND OFF STORAGE Functional Diagram for the MAX4959 Functional Diagrams |
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