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LTC2952 Datasheet(PDF) 6 Page - Linear Integrated Systems |
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LTC2952 Datasheet(HTML) 6 Page - Linear Integrated Systems |
6 / 24 page 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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