MAX6819
MAX6819
PRODUCTIONSOT23 Power-Supply Sequencers
Power Supply Sequencers for Dual/Multi-Voltage Systems Control Power On/Power Off Characteristics for Higher System Reliability
- Part Models
- 2
- 1ku List Price
- Starting From $3.90
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Overview
- Adjustable Primary Supply Voltage Monitor (Monitors Down to 0.62V)
- Internal Charge Pump to Enhance External Secondary Supply N-Channel MOSFET Switch
- Delay from Primary Supply Good to Secondary Supply Enabled
- Factory Fixed 200ms (MAX6819)
- Capacitor Adjustable (MAX6820)
- Logic Driven ENABLE Input (MAX6819)
- Immune to Short Voltage Transients
- Few External Components
- -40°C to +125°C Operating Temperature Range
- Small 6-Pin SOT23 Package
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.
Applications
- Digital Signal Processing
- Dual-Voltage Microprocessors
- Multivoltage Systems
- PowerPC® Series Processors
Documentation
Data Sheet 1
Design Note 2
Technical Articles 5
Product Selection Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX6819UT+ | SOT_23 | ||
| MAX6819UT+T | SOT_23 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571C PIN/ERRATA |
||
| MAX6819UT+ | PRODUCTION | |
| MAX6819UT+T | PRODUCTION | |
|
Feb 4, 2015 - 1341_CANCELLATION ASSEMBLY |
||
| MAX6819UT+ | PRODUCTION | |
| MAX6819UT+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Supervisory Circuits & Reset ICs 1 | ||
| MAX809 | PRODUCTION | 3-Pin Microprocessor Reset Circuits |
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