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LTC4355 Datasheet(PDF) 6 Page - Linear Integrated Systems

Part # LTC4355
Description  18V Dual Input Micropower PowerPath Prioritizer
Download  20 Pages
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC4355 Datasheet(HTML) 6 Page - Linear Integrated Systems

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LTC4419
6
4419f
For more information www.linear.com/LTC4419
pin FuncTions
ADJ: Adjustable V1 Switchover Threshold Input. ADJ
is the noninverting input to the switchover threshold
comparator. 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 V2 ≥ 1.55V. Otherwise, OUT
stays unpowered. Tie ADJ via a resistive divider to V1 to
set the V1 to V2 switchover voltage. Do not leave open.
CMP1: Auxiliary Comparator 1 Monitor Input. CMP1 is the
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.
CMP2: Auxiliary Comparator 2 Monitor Input. CMP2 is
the noninverting input to a second auxiliary comparator.
The inverting input is internally connected to a 0.387V
reference. Connect CMP2 to GND when it is not used.
CMPOUT1:AuxiliaryComparator1Output.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.
CMPOUT2:AuxiliaryComparator2Output.Thisopen-drain
comparator output is pulled low when CMP2 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.
Exposed Pad: For best thermal performance, solder ex-
posed pad to a large PCB area.
GND: Device Ground.
NC: No Connection. Not internally connected.
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
section. Additionally, OUT must be at least 50mV below
the input supply for a connection to that supply to be
activated. Bypass with a capacitor of 1µF or greater. See
Applications Information section 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 mode, 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. V2 is valid if its voltage is
≥1.55V. OUT is internally switched to V2 if ADJ < 1.047V
or V1 < 1.55V, provided V2 is valid. Refer to Table 1 of
the Applications Information section. Bypass with 1µF or
greater. Tie to GND if unused.
V2ON: V2 Connected Status. V2ON is an output that is
driven high with a 5µA pull-up when the V2 to OUT power
path is active. Otherwise it is driven low. Connect a resis-
tor between OUT or V2 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.


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