MAX6429 MAXIM [Maxim Integrated Products], MAX6429 Datasheet

MAX6429

Manufacturer Part Number

MAX6429

Description

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

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6429.pdf (20 pages)

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The MAX6427–MAX6438 are single/dual-level battery mon-

itors 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 out-

put 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 micro-

processor 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 sin-

gle 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 out-

put 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.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

________________________Applications

19-2323; Rev 1; 9/03

Typical Operating Circuit appears at end of data sheet.

Battery-Powered Systems (Single-Cell Li+ or

Two/Three-Cell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Portable Medical Devices

Electronic Toys

Low-Power, Single/Dual-Level Battery Monitors

________________________________________________________________ Maxim Integrated Products

General Description

Pagers

PDAs

MP3 Players

o Factory-Trimmed or User-Adjustable Threshold

o Low Current (1µA, typ)

o Single or Dual Low-Battery Outputs

o Push-Pull LBO, Open-Drain LBO, and Open-Drain

o 140ms Minimum LBO Timeout Period

o Immune to Short Battery Voltage Transients

o Guaranteed Valid LBO Logic State to BATT = 1.0V

o -40°C to +85°C Operating Temperature Range

o Small 3, 4, 5 and 6-Pin SOT Packages

o No External Components Required

Ordering Information continued at end of data sheet.

†

battery-monitor thresholds. Select the desired thresholds

using Tables 1 or 2 and enter the corresponding letters in

the part number by replacing “_ _”.

Note: There are 26 standard versions with a required order

minimum of 2500 pieces. Sample stock is generally held on

the standard versions only (see Standard Versions Table).

Required order increment is 10,000 pieces for nonstandard

versions. Contact factory for availability. All devices avail-

able in tape-and-reel only.

Pin Configurations continued at end of data sheet.

The MAX6427–MAX6432 are available with factory-trimmed

MAX6427_ _UR-T

Options

LBO Options

(MAX6427–MAX6432)

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)

TOP VIEW

PART

( ) ARE FOR THE MAX6429.

(LBO)

with Hysteresis

BATT

LBO

-40°C to +85°C

TEMP RANGE

Ordering Information

SOT23-3

MAX6427

MAX6428

MAX6429

Pin Configurations

GND

PIN-PACKAGE

3 SOT23-3

Features

Related parts for MAX6429

MAX6429 Summary of contents

Page 1

... TOP VIEW Pagers PDAs MP3 Players Pin Configurations continued at end of data sheet. with Hysteresis Features Ordering Information TEMP RANGE PIN-PACKAGE -40°C to +85°C 3 SOT23-3 Pin Configurations LBO 1 (LBO) MAX6427 3 GND MAX6428 MAX6429 BATT 2 SOT23 ARE FOR THE MAX6429. 1 ...

Page 2

... LBO deasserted when BATT rises above HTH V (MAX6427/MAX6428/MAX6429) HTH Factory-fixed options, BATT falling, LBO asserted when BATT falls below V LTH (MAX6427/MAX6428/MAX6429) Factory-fixed options, BATT falling, LBOH asserted when BATT falls below V (MAX6430/MAX6431/MAX6432) Factory-fixed options, BATT rising, LBOH deasserted when BATT rises above V (MAX6430/MAX6431/MAX6432) ...

Page 3

Low-Power, Single/Dual-Level Battery Monitors ELECTRICAL CHARACTERISTICS (continued) (BATT = 1. 1.6V to 5.5V (Note 1) PARAMETER SYMBOL USER-ADJUSTABLE THRESHOLDS (MAX6433–MAX6438) HTHIN Threshold (Note 4) LTHIN Threshold (Note 4) HTHIN+ Threshold V (Note 4) ...

Page 4

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis ELECTRICAL CHARACTERISTICS (continued) (BATT = 1. 1.6V to 5.5V (Note 1) PARAMETER SYMBOL LOW-BATTERY OUTPUTS (LBO, LBO, LBOH, LBOH, LBOL, LBOL ) Timeout Period t LBOP Delay ...

Page 5

Low-Power, Single/Dual-Level Battery Monitors (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE 1 BATT 1 3.3V 1.2 BATT 0.9 0 BATT 0.3 LBO NOT ASSERTED 0 -40 -20 0 ...

Page 6

... M AX6436/ NAME M AX6437/ M AX6438 Low-Battery Output. LBO/LBO is asserted when BATT drops below V (MAX6427/MAX6428/MAX6429) or when LTHIN LTH LBO/ (MAX6433/MAX6434/MAX6435) drops below V — LBO remains asserted for at least 140ms after BATT exceeds V (MAX6427/MAX6428/MAX6429 MAX6434/MAX6435). Battery-Voltage Input. Input for battery-voltage threshold — ...

Page 7

... V BATT V BATT 615 + ARE FOR THE MAX6429 Figure 1. MAX6427/MAX6428/MAX6429 Functional Diagram _______________________________________________________________________________________ with Hysteresis trimmed thresholds are ideal for monitoring single-cell Li+ or multicell alkaline/NiCd/NiMH power supplies. User-programmable versions are also available with thresholds determined using an external resistor- divider (see Resistor-Value Selection).The adjustable versions can monitor down to 0 ...

Page 8

... The MAX6427/MAX6428/MAX6429/MAX6433/MAX6434/ MAX6435 single-output voltage monitors provide a sin- gle low-battery output, LBO/LBO. The MAX6427/ MAX6428/MAX6429 fixed-threshold parts assert LBO/LBO when BATT drops below V MAX6433/MAX6434/MAX6435 adjustable-threshold parts assert LBO/LBO when the LTHIN input drops below the V threshold (615mV) (see Figure 5) ...

Page 9

... This is especially important for applications where the load on the battery creates significant fluctuations in battery voltages. Fixed Hysteresis (MAX6427–MAX6432) The MAX6427/MAX6428/MAX6429 total hysteresis is the difference between the factory-trimmed V For the MAX6430/MAX6431/MAX6432, the total hysteresis is the difference between the factory-trimmed V ...

Page 10

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis V BATT LTHIN HTHIN V BATT 615 + ARE FOR THE MAX6438 Figure 4. MAX6436/MAX6437/MAX6438 Functional Diagram V HTH V BATT V LTH t LBOP LBO Figure 5. Single Low-Battery ...

Page 11

Low-Power, Single/Dual-Level Battery Monitors V HTH+ V HTH- V BATT V LTH+ V LTH- t LBOP LBOL LBOH Figure 6. Dual Low-Battery Output Timing MAX6433 R1 LTHIN R2 HTHIN R3 Figure 7. Adjustable Threshold Selection ______________________________________________________________________________________ ...

Page 12

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis Applications Information Resistor-Value Selection (Programming the Adjustable Thresholds) MAX6433/MAX6434/MAX6435 (See Figure 615 REF LTHIN HTHIN   TRIPLOW LTH ...

Page 13

Low-Power, Single/Dual-Level Battery Monitors Microprocessor power will not return until the battery has recharged to a voltage greater than HTH+ (Figure 6). Li+ Battery Charger Application The MAX6430/MAX6431/MAX6432 and MAX6436/ MAX6437/MAX6438 dual-output battery monitors can be used in conjunction with ...

Page 14

... Low-Power, Single/Dual-Level Battery Monitors with Hysteresis Ordering Information (continued) PART TEMP RANGE MAX6428_ _UR-T -40°C to +85°C MAX6429_ _UR-T -40°C to +85°C MAX6430_ _US-T -40°C to +85°C MAX6431_ _US-T -40°C to +85°C MAX6432_ _US-T -40°C to +85°C MAX6433UK-T -40°C to +85°C MAX6434UK-T -40° ...

Page 15

Low-Power, Single/Dual-Level Battery Monitors Table 1. Factory-Trimmed Lower and Upper Threshold Combinations for Single-Cell Li+ or Three-Cell Alkaline/NiCd/NiMH Applications (MAX6427–MAX6432) VOLTAGES 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V Table 2. Factory-Trimmed Lower and Upper Threshold Combinations for Two-Cell Alkaline/NiCd/NiMH Applications (MAX6427–MAX6432) ...

Page 16

... Low-Power, Single/Dual-Level Battery Monitors with Hysteresis FACTORY- PART FIXED ADJUSTABLE THRESHOLDS THRESHOLDS MAX6427 MAX6428 MAX6429 MAX6430 MAX6431 MAX6432 MAX6433 — MAX6434 — MAX6435 — MAX6436 — MAX6437 — MAX6438 — 16 ______________________________________________________________________________________ ACTIVE- ACTIVE- USER- LOW PUSH- LOW OPEN- PULL DRAIN OUTPUT OUTPUT — ...

Page 17

Low-Power, Single/Dual-Level Battery Monitors (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ with Hysteresis Package Information PACKAGE OUTLINE, 3L SOT-23 1 21-0051 F 1 ...

Page 18

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, SOT-143, 4L 21-0052 1 ...

Page 19

Page 20

Low-Power, Single/Dual-Level Battery Monitors with Hysteresis (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than ...

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