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MAX4959 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX4959
Description  High-Voltage OVP with Battery Switchover
Download  17 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX4959 Datasheet(HTML) 6 Page - Maxim Integrated Products

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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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