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LTC3129 Datasheet(PDF) 8 Page - Linear Integrated Systems |
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LTC3129 Datasheet(HTML) 8 Page - Linear Integrated Systems |
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8 / 20 page  LTC4419 8 4419f For more information www.linear.com/LTC4419 operaTion The Functional Diagram shows the major blocks of the LTC4419. The LTC4419 is a PowerPath prioritizer that switches output OUT between primary (V1) and backup (V2) sources depending on their validity and priority with V1 having the highest priority. If neither supply is valid, OUTstaysunpowered.AresistivedividerbetweenV1,ADJ and GND and comparators CUV1 and CADJ are used to monitor V1’s voltage to establish validity. V1 is valid if V1 ≥ 1.55V and ADJ ≥ 1.097V for 64ms after V1 rises above 1.55V. Otherwise V1 is invalid. V2 is valid if its voltage as monitored by comparator CUV2 is ≥1.55V. Otherwise, it is invalid. Switchover threshold is independent of relative V1 and V2 voltages, permitting V1 to be lower or higher than V2 when V1 powers OUT and vice versa. Powerconnectiontotheoutputismadebyenhancingback- to-back internal P-channel MOSFETs. Current passed by the MOSFETs is limited to typically 1.1A if OUT is greater than 1V. Otherwise it is limited to 250mA. When switching from V1 to V2, the V1 to OUT power path is first disabled and comparator CREV2 is enabled. After the OUT voltage drops 50mV below V2, as detected by CREV2, OUT is then connected to V2. V2ON pulls high after switchover. This break-before-make strategy prevents OUT from backfeeding V2. Switchover back to V1 occurs in a similar manner once V1 has been revalidated. V2ON pulls low if the V2 power path is disabled and during initial power-up when V1 or V2 is first applied. The LTC4419 blocks reverse voltages up to –15V when a reverse condition occurs on an inactive channel. The LTC4419 also disables a channel if the corresponding input supply falls below 1.52V. A small ~3µA current is drawnfromeithertheprioritizedinputsupplyorthehighest input supply if both input supplies are below 1.55V. Very little current (~320nA) is drawn from the unused supply. The LTC4419 provides two additional comparators, CP1 and CP2, whose open-drain outputs pull low when CMP1 and CMP2 pin voltages fall below 0.387V and during initial power-up. These comparators can be used to monitor supplies to provide early power failure warning and other useful information. The LTC4419 can be put into a V2 freshness seal mode to prevent battery discharge during storage or shipment. The Applications Information section lists the steps to engage and disengage V2 freshness seal. |
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Similar Description - LTC3129 |
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