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Data Sheet

FULL DATA SHEET (PDF, 528kB) Download   E-Mail

Description

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.

Key Features		Applications/Uses
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		Digital Signal Processing Dual-Voltage Microprocessors Multivoltage Systems PowerPC® Series Processors

Diagram

Typical Operating Circuit

Application Notes

Application Note 1043: Single Supply Sequencer Sequences Negative Voltages - MAX6819, MAX6820 Application Note 1133: Multiple Voltage Systems Need Supply-Voltage Sequencing - MAX6819, MAX6820 Application Note 2391: Dual Voltage Tracking Circuit for I/O, Microprocessor, and DSP Core Voltages - MAX6820 Application Note 2853: Supervisors in Multivoltage Systems - MAX6819, MAX6819, MAX6820, MAX6820 Application Note 3456: Programmable System-Management IC Monitors and Sequences Requirements in Complex, Multivoltage Systems - MAX6819, MAX6820 Application Note 3493: System-Management IC Meets Monitoring and Sequencing Requirements in Multivoltage Systems - MAX6819, MAX6820 Application Note 3567: Monitoring and Sequencing Supply Voltages in High-Reliability Systems - MAX6819 Application Note 3811: Simple Devices for Meeting Voltage Tracking Requirements - MAX6820 Application Note 3864: The FET-OR Connection for Power Supplies - MAX6820

Evaluation Kits

none

Design Guides

MICROPROCESSOR SUPERVISORY (PDF)

Reliability Reports

Show FIT data for: MAX6819 MAX6820 Reliability Report: MAX6820UT.pdf Request Reliability Report for: MAX6819

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX6819	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6819UT+			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6819UT			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6819UT-T			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6819UT+T			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6820	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6820UT+			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6820UT			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6820UT-T			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6820UT+T			SOT-23;6 pin;9 mm² Dwg: 21-0058I (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Topmark Coding: MAX6819 MAX6820 New Product Press Release 2001-02-26

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