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LTC4355 Datasheet(PDF) 6 Page - Linear Integrated Systems |
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LTC4355 Datasheet(HTML) 6 Page - Linear Integrated Systems |
6 / 20 page 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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