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SOT23 power-supply sequencers
29 August 2001, Power Electronics / Power Management
The Maxim MAX6819/MAX6820 power-supply sequencers are designed for dual-voltage processors and multivoltage systems. These devices monitor a primary supply voltage to enable or disable an external N-channel MOSFET switch for the secondary supply voltage. The devices help control supply voltage sequencing for systems components when a system's turn on/off characteristics cannot be guaranteed such as from a system bus or silver box supply.
When the primary supply is below a user-adjustable voltage threshold, the N-channel MOSFET switch is off, keeping the secondary supply away from the system component. When the primary supply exceeds the voltage threshold, the internal charge pump turns on after a sequence delay of 200 ms and drives the external N-channel MOSFET. The charge pump allows the N-channel MOSFET to be fully enhanced to reduce on-resistance losses.
The MAX6819 features a logic-driven enable input to enable and disable the MOSFET. The MAX6820 provides for the sequence delay to be externally adjusted with a capacitor. For multi-voltage systems, these devices can be daisy-chained together to sequence more than two supplies within a system.
The devices operate from -40 to +125°C and are available in a 6-pin SOT23 package. |
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