MAX6877, MAX6878, MAX6879 Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors

Description

The MAX6877/MAX6878/MAX6879 multivoltage power trackers/sequencers/supervisors monitor up to three system voltages and provide proper power-up and power-down control for systems requiring voltage tracking or sequencing. These devices ensure controlled voltage tracking within a specified range or sequencing in the proper order as system power supplies are enabled. The MAX6877/MAX6878/MAX6879 generate all required voltages and timing to control up to three external n-channel pass FETs for the OUT1/OUT2/OUT3 supply voltages (see the Selector Guide for different features of each device).

The MAX6877/MAX6878/MAX6879 feature adjustable undervoltage thresholds for each input supply. When all the voltages are above these adjustable thresholds, the devices turn on the external n-channel MOSFETs to either sequence or track the voltages to the system. During voltage-tracking mode, the voltage at the GATE of each MOSFET is increased to slowly bring up all supplies at a controlled slew rate. The MAX6877/MAX6878/MAX6879 feature an autoretry or latch-off mode with capacitor-adjusted timing.

These devices also provide a controlled power-down (tracking mode) when the system shuts off in an orderly manner. When an unexpected fault occurs, the outputs are all pulled down simultaneously with an internal 100 Ohm

pulldown to help discharge capactive loads at the MOSFET's source. The MAX6877/MAX6878/MAX6879 feature independent internal charge pumps to fully enhance the external FETs for low-voltage drop at highpass current. The MAX6877 and MAX6878 also feature a power-good output with a selectable timeout period that can be used for system reset.

The MAX6877/MAX6878/MAX6879 are available in small 4mm x 4mm 24-pin and 16-pin thin QFN packages and are fully specified over the -40°C to +85°C extended operating temperature range.

Key Features

Applications/Uses

Pin-Selectable Tracking or Sequencing Control for Up to Three Supply Voltages
Capacitor-Adjustable Power-Up/Down Tracking Slew Rate
Capacitor-Adjustable Power-Up Sequencing Delay
Internal Charge Pumps to Enhance External n-Channel FETs
Capacitor-Adjustable Timeout Period Power-Good Output (MAX6877/MAX6878)
Adjustable Undervoltage Lockout or Logic-Enable Input
Internal 100 Pulldown for Each Output to Discharge Capacitive Load Quickly
0.5V to 5.5V Nominal IN_/OUT_ Range
2.7V to 5.5V Operating Voltage Range
Immune to Short Voltage Transients
Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN Packages

	Multivoltage Systems
	Networking Systems
	Servers/Workstations
	Storage Equipment
	Telecom

Key Specifications: Sequencers/Trackers

Part Number

Option

Interface

Number of Input Channels

Maximum Operating Voltage Range (V)

Features

Package

Operating Temp. Range (°C)

Price^**

MAX6877

Sequence
Sequence and Track
Track

Factory Fixed
R/C Adjustable

•	Charge Pump Output

•	Enable Input

•	Reset Output

•	Slew Rate Control

THIN QFN/24

-40 to +85

$3.07 @ 1k

MAX6878

•	Charge Pump Output

•	Enable Input

•	Reset Output

•	Slew Rate Control

THIN QFN/24

$2.79 @ 1k

MAX6879

•	Charge Pump Output

•	Enable Input

•	Slew Rate Control

THIN QFN/16

$2.65 @ 1k

See All Sequencers/Trackers (52)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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: 1-12 of 12

MAX6877

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6877ETG

THIN QFN;24 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2444-4*

-40°C to +85°C

See data sheet
Materials Analysis

MAX6877ETG+

THIN QFN;24 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2444+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6877ETG+T

THIN QFN;24 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2444+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6877ETG-T

-40°C to +85°C

See data sheet

MAX6878

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6878ETG+T

-40°C to +85°C

See data sheet

MAX6878ETG+

THIN QFN;24 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2444+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6878ETG

THIN QFN;24 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T2444-4*

-40°C to +85°C

See data sheet
Materials Analysis

MAX6878ETG-T

-40°C to +85°C

See data sheet

MAX6879

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6879ETE-T

-40°C to +85°C

See data sheet

MAX6879ETE+

THIN QFN;16 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T1644+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6879ETE

THIN QFN;16 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T1644-4*

-40°C to +85°C

See data sheet
Materials Analysis

MAX6879ETE+T

THIN QFN;16 pin;
Dwg: 21-0139 (PDF)
Use pkgcode/variation: T1644+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis