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Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX6427, MAX6428, MAX6429, ...

MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis

Low-Power, Single/Dual Level Battery Monitor with Internal Hysteresis Requires No External Components. Ideal for Single Cell Lithium or Multi-Cell Alkaline, NiMH, and NiCd Applications

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX6427-MAX6438 are single/dual-level battery monitors with internal hysteresis. These devices are offered with single (MAX6427/MAX6428/MAX6429, MAX6433/MAX6434/MAX6435) or dual (MAX6430/MAX6431/MAX6432, MAX6436/MAX6437/MAX6438) low-battery output indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system).

These devices are ideal for monitoring single lithium-ion (Li+) cells or multicell alkaline/NiCd/NiMH power supplies. When the power-supply voltage drops below the specified low threshold, the low-battery output asserts. When the voltage rises above the specified high threshold, the low-battery output is deasserted following a 140ms minimum timeout period. The timeout period ensures that the supply voltages have stabilized before power-converter or microprocessor activity is enabled.

The MAX6427-MAX6438 family is available with several monitoring options. The MAX6427/MAX6428/MAX6429 offer factory-trimmed battery-monitor thresholds, with a single low-battery output. The MAX6430/MAX6431/MAX6432 also feature factory-trimmed thresholds, but have two low-battery outputs. The MAX6433-MAX6438 have user-adjustable threshold voltages permitting the user to select the hysteresis range, and consequently the sensitivity of the system to noise. A wide hysteresis range also prevents chattering that can result due to battery recovery after load removal. Single low-battery outputs are supplied by the MAX6433/MAX6434/MAX6435 and dual low-battery outputs by the MAX6436/MAX6437/MAX6438.

The MAX6427-MAX6438 family is available with three output logic options for convenient interface with system power circuitry or microprocessors. The family is offered in small SOT23 and SOT143 packages and is fully specified over temperature.

Data Sheet

Download	Rev 2	(PDF, 388kB)
E-Mail

Key Features

Factory-Trimmed or User-Adjustable Threshold Options
- Factory-Trimmed Low Thresholds from 1.6V to 2.1V or 2.6V to 3.1V in 100mV Increments (MAX6427-MAX6432)
- Factory-Trimmed High Thresholds from 2.3V to 2.6V or 3.3V to 3.6V in 100mV Increments (MAX6427-MAX6432)
- User-Adjustable Low/High Thresholds with 615mV Internal Reference (MAX6433-MAX6438)
Low Current (1µA, typ)
Single or Dual Low-Battery Outputs
Push-Pull active-low LBO, Open-Drain active-low LBO, and Open-Drain LBO Options
140ms Minimum LBO Timeout Period
Immune to Short Battery Voltage Transients
Guaranteed Valid LBO Logic State to BATT = 1.0V
-40°C to +85°C Operating Temperature Range
Small 3, 4, 5 and 6-Pin SOT Packages
No External Components Required (MAX6427-MAX6432)

Applications/Uses

Battery-Powered Systems (Single-Cell Li+ or Multicell NiMH, NiCd, Alkaline)
Cell Phones/Cordless Phones
Electronic Toys
MP3 Players
Pagers
PDAs
Portable Medical Devices

Key Specifications:

Supervisors (1 Monitored Voltage)

Part Number

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6427

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

85ms to 300ms

No Watchdog

Power Fail Comparator/Low Battery Detect

2.5

1.5

$0.90 @1k

MAX6428

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

$0.90 @1k

MAX6429

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active High

Open Drain

$0.90 @1k

MAX6433

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

$0.90 @1k

MAX6434

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

$0.90 @1k

MAX6435

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active High

Open Drain

$0.90 @1k

See All Supervisors (1 Monitored Voltage) (274)

Pricing 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.

Supervisors (2 Monitored Voltages)

Part Number

Interface

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6430

Factory Fixed

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

85ms to 300ms

No Watchdog

Power Fail Comparator/Low Battery Detect

2.5

1.5

$1.14 @1k

MAX6431

Factory Fixed

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

$1.14 @1k

MAX6432

Factory Fixed

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active High

Open Drain

$1.14 @1k

MAX6436

R/C Adjustable

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

$1.14 @1k

MAX6437

R/C Adjustable

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

$1.14 @1k

MAX6438

R/C Adjustable

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active High

Open Drain

$1.09 @1k

See All Supervisors (2 Monitored Voltages) (84)

Diagram

Typical Operating Circuit

Application Notes

Reference Design 3744

Circuit Enables Single NiMH Cell to Simulate a Lithium Battery

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX6434.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Devices: 1-50 / 598

<-- Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next -->

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6427AGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427AGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427AHUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427AHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427AIUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427AIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427AJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427AJUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427BGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427BGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6427BHUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427BHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427BIUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427BIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427BJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427BJUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427CGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427CGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427CHUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427CHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6427CIUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427CIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427CJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427CJUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427DGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427DGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427DHUR+			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6427DHUR+T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6427DHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427DIUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6427DIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427DJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427DJUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427EGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427EGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427EHUR+			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6427EHUR+T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6427EHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427EIUR+			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6427EIUR+T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6427EIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427EJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427EJUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427FGUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427FGUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427FHUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427FHUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427FIUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6427FIUR-T			Active	SOT;3 pin;8 mm² Outline Drawing:21-0051 (PDF) Land Pattern: 90-0179 (PDF) Use pkgcode/variation: U3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6427FJUR+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet

Devices: 1-50 / 598

<-- Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next -->

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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More Information

Topmark Coding	MAX6427
Topmark Coding	MAX6428
Topmark Coding	MAX6429
Topmark Coding	MAX6430
Topmark Coding	MAX6431
Topmark Coding	MAX6432
New Product Press Release	[ 2002-02-06 ]

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Document Ref.: 19-2323 Rev 2; 2006-05-09
This page last modified: 2009-08-18

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Application Notes

Product Guides

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

More Information

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products