MAX6849KAYD7-T Maxim Integrated, MAX6849KAYD7-T Datasheet

MAX6849KAYD7-T

Manufacturer Part Number

MAX6849KAYD7-T

Description

Battery Management

Manufacturer

Maxim Integrated

Series

MAX6846, MAX6847, MAX6848, MAX6849r

Datasheet

1.MAX6849KATD7-T.pdf (12 pages)

Specifications of MAX6849KAYD7-T

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Package / Case

SOT-23

Current page: 1 of 12
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The MAX6846–MAX6849 are a family of ultra-low-power

battery monitors with integrated microprocessor (µP)

supervisors. The user-adjustable battery monitors are

offered with single or dual low-battery output options that

can be used to signal when the battery is OK (enabling

full system operation), when the battery is low (for low-

power system operation), and when the battery is dead

(to disable system operation). These devices also have

an independent µP supervisor that monitors V

provides an active-low reset output. A manual reset

function is available to reset the µP with a pushbutton.

The MAX6846–MAX6849 are ideal for single-cell lithium-

ion (Li+) or multicell alkaline/NiCd/NiMH applications.

When the battery voltage drops below each adjusted low

threshold, the low-battery outputs are asserted to alert

the system. When the voltage rises above the adjusted

high thresholds, the outputs are deasserted after a

150ms minimum timeout period, ensuring the voltages

have stabilized before power circuitry is activated or pro-

viding microprocessor reset timing.

These devices have user-adjustable battery threshold

voltages, providing a wide hysteresis range to prevent

chattering that can result due to battery recovery after

load removal. Single low-battery outputs are supplied

by the MAX6846/MAX6847 and dual low-battery out-

puts are supplied by the MAX6848/MAX6849. All bat-

tery monitors have open-drain low-battery outputs.

The MAX6846–MAX6849 monitor system voltages

options. Each device is offered with two minimum reset

timeout periods of 150ms or 1200ms. The MAX6846/

MAX6848 are offered with an open-drain RESET output

and the MAX6847/MAX6849 are offered with a push-

pull RESET output.

The MAX6846–MAX6849 are offered in a SOT23 pack-

age and are fully specified over a -40°C to +85°C temp-

erature range.

19-2947; Rev 1; 11/05

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.

) from 1.8V to 3.3V with seven fixed reset threshold

Low-Power, Adjustable Battery Monitors with

Battery-Powered Systems (Single-Cell Li+ or

Multicell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Portable Medical Devices

Digital Cameras

Pagers

PDAs

MP3 Players

Electronic Toys

________________________________________________________________ Maxim Integrated Products

General Description

Hysteresis and Integrated µP Reset

Applications

and

♦ User-Adjustable Thresholds for Monitoring

♦ Single and Dual Low-Battery Output Options

♦ Independent µP Reset with Manual Reset

♦ Factory-Set Reset Thresholds for Monitoring 1.8V

♦ Available with 150ms (min) or 1.2s (min) V

♦ 150ms (min) LBO Timeout Period

♦ Immune to Short-Battery Voltage Transients

♦ Low Current (2.5µA, typ at 3.6V)

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

♦ Small 8-Pin SOT23 Packages

Note: The first “_” is the V

in Table 1. The “_” after the D is a placeholder for the reset

timeout period suffix found in Table 2. All devices are available

in tape-and-reel only. There is a 2500 piece minimum order

increment for standard versions (see Standard Versions table).

Sample stock is typically held on standard versions only. Non-

standard versions require a minimum order increment of

10,000 pieces. Contact factory for availability.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

MAX6846KA_D_-T

MAX6847KA_D_-T

MAX6848KA_D_-T

MAX6849KA_D_-T

TOP VIEW

LTHIN

Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH

Applications

to 3.3V Systems

Reset Timeout Period Options

GND

LBO

PART

MAX6846

MAX6847

SOT23

Ordering Information

HTHIN

RESET

-40°C to +85°C

TEMP RANGE

reset threshold level, suffix found

Pin Configurations

LTHIN

LBOL

GND

MAX6848

MAX6849

SOT23

PIN-PACKAGE

8 SOT23-8

Features

HTHIN

LBOH

RESET

Related parts for MAX6849KAYD7-T

MAX6849KAYD7-T Summary of contents

Page 1

... Portable Medical Devices Digital Cameras Pagers PDAs MP3 Players Electronic Toys ________________________________________________________________ Maxim Integrated Products 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. ♦ User-Adjustable Thresholds for Monitoring Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH Applications ♦ ...

Page 2

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset ABSOLUTE MAXIMUM RATINGS GND ....................................................-0.3V to +6V Open-Drain LBO, LBOH, LBOL to GND .................-0.3V to +6V* Open-Drain RESET to GND ....................................-0.3V to +6V* Push-Pull ...

Page 3

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset ELECTRICAL CHARACTERISTICS (continued 1.6V to 5.5V 1.2V to 5.5V PARAMETER SYMBOL LBO, LBOL, LBOH Output Open-Drain Leakage Current V Reset Threshold CC V ...

Page 4

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset (V = 3.6V 3.3V, unless otherwise specified. Typical values are SUPPLY CURRENT vs. TEMPERATURE 3.3V 3. ...

Page 5

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset (V = 3.6V 3.3V, unless otherwise specified. Typical values are NORMALIZED UPPER AND LOWER LBO TRIP VOLTAGES vs. TEMPERATURE 1.050 1.025 1.000 0.975 0.950 ...

Page 6

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset PIN MAX6846/MAX6847 MAX6848/MAX6849 — — — 6 — 4 Detailed Description The MAX6846–MAX6849 family is available ...

Page 7

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset V DD LTHIN LTH DETECT HTHIN HTH LBO TIMEOUT DETECT PERIOD 615mV V CC RESET V TH TIMEOUT DETECT PERIOD 1.23V MR Figure 1a. MAX6847 Functional Diagram Low-Battery Output The ...

Page 8

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset V MONITORED V HTH TRIPHIGH V LTH TRIPLOW LBO V = HYSTERESIS HYST Figure 2. Single Low-Battery Output Timing V MONITORED (V +5%) HTH+ TRIPHIGH V HTH- TRIPHIGH (V +5%) ...

Page 9

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset Many microprocessor-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset while the monitored supplies remain above their reset thresholds. ...

Page 10

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset 1) Choose a value for R , the sum of R1, R2, and TOTAL R3. Because the MAX6848/MAX6849 have very high input impedance, R can 500kΩ. TOTAL ...

Page 11

Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset OPEN-DRAIN PART RESET MAX6846 X MAX6847 — MAX6848 X MAX6849 — Standard Versions Table PART MAX6846KARD3 MAX6846KASD3 MAX6846KAWD3 MAX6846KAZD3 MAX6847KARD3 MAX6847KASD3 MAX6847KAWD3 MAX6847KAZD3 MAX6848KARD3 MAX6848KASD3 MAX6848KAWD3 MAX6848KAZD3 MAX6849KARD3 MAX6849KASD3 MAX6849KAWD3 ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products SEE DETAIL "A" ...

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