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LTC2952 Datasheet(PDF) 6 Page - Linear Integrated Systems

Part # LTC2952
Description  18V Dual Input Micropower PowerPath Prioritizer with Backup Supply Monitoring
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC2952 Datasheet(HTML) 6 Page - Linear Integrated Systems

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LTC4420
6
4420f
For more information www.linear.com/LTC4420
pin FuncTions
ADJ: Adjustable Switchover Threshold Input. ADJ is the
noninvertinginputtotheswitchoverthresholdcomparator.
If V1 ≥ 1.55V and ADJ ≥ 1.097V for at least 64ms, OUT
is switched internally to the primary V1 input. When the
ADJ input voltage is lower than 1.047V, OUT is switched
internally to V2 if conditions in Table 1 of the Applica-
tions Information section are met. Otherwise, OUT stays
unpowered. Tie ADJ via a resistive divider to V1, in order
to set the V1 to V2 switchover voltage. Do not leave open.
CMP1:AuxiliaryComparator1MonitorInput.CMP1isthe
noninverting input to an auxiliary comparator. The invert-
ing input is internally connected to a 0.387V reference.
Connect CMP1 to GND when it is not used.
CMPOUT1:AuxiliaryComparatorOutput1.Thisopen-drain
comparator output is pulled low when CMP1 is below
0.387V and during power-up, otherwise it is released.
Once released, connecting a resistor between CMPOUT1
and a desired supply voltage up to 18V causes this pin to
be pulled high. Leave open if unused.
GNDSW: Pulsed GND Output. This open-drain output is
pulled low when V2UV is being monitored, otherwise it
is released high. Connect a resistive divider between V2,
V2UV and GNDSW to set V2 undervoltage threshold.
Leave open if unused.
Exposed Pad: For best thermal performance, solder the
exposed pad to a large PCB area.
GND: Device Ground.
OUT: Output Voltage Supply. OUT is a prioritized voltage
output that is either connected to V1, V2 or is unpowered
as indicated in Table 1 of the Applications Information sec-
tion. Additionally, OUT must be at least 50mV below the
inputsupplyforaconnectiontothatsupplytobeactivated.
Bypass with a capacitor of 1µF or greater. See Applica-
tions Information for bypass capacitor recommendations.
V1: Primary Power Supply. OUT is internally switched to
V1 if V1 ≥ 1.55V and ADJ ≥ 1.097V. When in freshness
seal, applying V1 ≥ 1.55V and ADJ ≥ 1.097V for 32ms
disables freshness seal. Bypass with 1µF or greater. Tie
to GND if unused.
V2: Backup Power Supply. OUT is internally switched to
V2 if ADJ < 1.047V or V1 < 1.55V, provided other condi-
tions listed in Table 1 in Applications Information are met.
Bypass with 1µF or greater. Tie to GND if unused.
V2DIS: V2 Power Path Disable Input. When driven low,
this pin disables the V2 to OUT power path if input V2UV
drops below 0.387V. Connect a resistor between V2 or
OUT and this pin to provide additional pull-up. Leave open
if unused. This pin is initialized high during power-up.
V2OK:V2OKLogicOutput.V2OKisanoutputthatisdriven
high with a 5µA pull-up if V2UV > 0.387V at the end of
the V2UV monitoring period. Otherwise it is driven low.
Connect a resistor between OUT and this pin to provide
additional pull-up. As this pin is used to enable freshness
seal, do not force low or connect a pull-down resistor to
this pin. Leave open if unused.
V2TEST: V2 Undervoltage Test Enable Input. This pin sets
the duty cycle of V2 undervoltage monitoring. When V1
is valid, driving V2TEST low disables V2 monitoring while
driving it high enables V2 monitoring with a maximum
duty cycle of ~0.1%. When V1 is invalid or not present,
V2 is always monitored with V2TEST setting the duty
cycle between 0.0015% and 0.1% depending on its own
state and previously determined V2 validity. Refer to the
state diagram and waveforms in the Applications Informa-
tion section for details. Leave open or connect a resistor
between V2 or OUT and this pin to provide additional
pull-up. Connect to GND if unused. This pin is initialized
high on power-up.
V2UV: V2 Undervoltage Monitor Input. V2UV is the non-
inverting input to a comparator whose inverting input is
internally connected to a 0.387V reference. Connect a
resistive divider between V2, V2UV and GNDSW to set V2
undervoltage threshold. See the Applications Information
section for details on V2 monitoring. Connect a pull-up
resistor to V2 if unused. Do not leave open.


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