The MAX6819/MAX6820 are power-supply sequencers for dual-voltage microprocessors (µPs) and multivoltage systems. These devices monitor a primary supply voltage and enable/disable an external N-channel MOSFET switch for a secondary supply voltage. The MAX6819/MAX6820 control local component voltage sequencing when system power-on/power-off characteristics cannot be guaranteed (supplies come from a multivoltage system bus, silver box, or must be sequenced in different modes for components on the same board). These small power-supply sequencers improve system reliability.
The MAX6819/MAX6820 include an internal voltage reference/comparator with externally adjustable thresholds to monitor the primary power supply. When the primary supply is below the desired threshold, an external secondary supply MOSFET switch is disabled. When the primary supply exceeds the threshold, an internal charge pump is activated and the external MOSFET switch is enabled to connect the secondary supply to the load. The charge pump fully enhances the N-channel MOSFET switch to provide a very low RDS-ON voltage drop. The devices can be connected to support various supply sequencing priorities such as VI/O before VCORE or VCORE before VI/O.
The MAX6819 features a logic-driven EN input to enable/disable the external MOSFET drive and includes an internally fixed 200ms enable timeout period
(VPRIMARY GOOD to VSECONDARY ENABLE). The MAX6820 allows the enable timeout period to be adjusted with a single external capacitor. Both devices are specified over the automotive temperature range
(-40°C to +125°C) and are available in space-saving
6-pin SOT23 packages.
주요기능
애플리케이션/용도
Adjustable Primary Supply Voltage Monitor (Monitors Down to 0.62V)
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Maxim 애플리케이션 엔지니어에게 문의하십시오. 부품을 찾는데 필요한 전문가의 도움이 보통 업무일 1일 이내에 제공됩니다.
부품번호 suffix: T 또는 T&R = 테잎 앤 릴,
+ = RoHS/lead-free,
# = RoHS/lead 예외.추가 정보: 전체 데이터 시트 또는 부품번호 규칙
*일부 패키지는 크기 편차(variation)를 가지며 이 값은 도면 상에 제시되어 있습니다. “패키지 코드/편차”는 해당 제품이 사용하고 있는 편차를 보여줍니다. 부품번호 suffix에 "+", "#", "-"는 RoHS 준수 상태를 나타냅니다. 패키지 도면에 suffix 문자는 다를 수 있습니다.
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