Data Sheet

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General Description

The MAX17043/MAX17044 are ultra-compact, low-cost,

host-side fuel-gauge systems for lithium-ion (Li+) batter-

ies in handheld and portable equipment. The MAX17043

is configured to operate with a single lithium cell and the

MAX17044 is configured for a dual-cell 2S pack.

The MAX17043/MAX17044 use a sophisticated Li+ bat-

tery-modeling scheme, called ModelGauge™ to track

the battery’s relative state-of-charge (SOC) continuously

over a widely varying charge/discharge profile. Unlike

traditional fuel gauges, the ModelGauge algorithm elimi-

nates the need for battery relearn cycles and an external

current-sense resistor. Temperature compensation is pos-

sible in the application with minimal interaction between a

μC and the device.

The IC can be located on the system side, reducing cost

and supply chain constraints on the battery. Measurement

and estimated capacity data sets are accessed through

an I

C interface. The MAX17043/MAX17044 are avail-

able in either a 0.4mm pitch 9-bump UCSP™ or 2mm x

3mm, 8-pin TDFN lead-free package.

Applications

● Smartphones, Tablets

● Health and Fitness Monitors

● Digital Still, Video, and Action Cameras

● Medical Devices

● Handheld Computers and Terminals

● Wireless Speakers

Features

● Host-Side or Battery-Side Fuel Gauging

• 1 Cell (MAX17043)

• 2 Cell (MAX17044)

● Precision Voltage Measurement

• ±12.5mV Accuracy to 5.00V (MAX17043)

• ±30mV Accuracy to 10.00V (MAX17044)

● Accurate Relative Capacity (RSOC) Calculated from

ModelGauge Algorithm

● No Offset Accumulation on Measurement

● No Full-to-Empty Battery Relearning Necessary

● No Sense Resistor Required

● External Alarm/Interrupt for Low-Battery Warning

● 2-Wire Interface

● Low Power Consumption

● Tiny, Lead(Pb)-Free, 8-Pin, 2mm x 3mm TDFN

Package or Tiny 0.4mm Pitch 9-Bump UCSP Package

19-4811; Rev 7; 1/17

ModelGauge is a trademark of Maxim Integrated Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.

Visit www.maximintegrated.com/products/patents for product

patent marking information.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX17043G+U -20°C to +70°C 8 TDFN-EP*

MAX17043G+T -20°C to +70°C 8 TDFN-EP*

MAX17043X+ -20°C to +70°C 9 UCSP

MAX17043X+T10 -20°C to +70°C 9 UCSP

MAX17044G+U -20°C to +70°C 8 TDFN-EP*

MAX17044G+T -20°C to +70°C 8 TDFN-EP*

MAX17044X+ -20°C to +70°C 9 UCSP

MAX17044X+T10 -20°C to +70°C 9 UCSP

Li+

PROTECTION

CIRCUIT

MAX17043

MAX17044

CELL

1µF

1kΩ

10nF

150Ω

GND

CTG

SCL

SDA

QSTRT

ALRT

SYSTEM

µP

C BUS

MASTER

INTERRUPT

4.7kΩ

MAX17043/MAX17044 1-Cell/2-Cell Fuel Gauge with

ModelGauge and Low-Battery Alert

Simple Fuel-Gauge Circuit Diagram

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (14 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX17043/MAX17044 1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert General Description Features The MAX17043/MAX17044 are ultra-compact, low-cost, host-side fuel-gauge systems for lithium-ion (Li+) batteries in handheld and portable equipment. The MAX17043 is configured to operate with a single lithium cell and the MAX17044 is configured for a dual-cell 2S pack.
PAGE 2
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Absolute Maximum Ratings Voltage on CTG Pin Relative to VGND....................-0.3V to +12V Voltage on CELL Pin Relative to VGND..................-0.3V to +12V Voltage on All Other Pins Relative to VGND..............-0.3V to +6V Operating Temperature Range..............................-40°C to +85°C Storage Temperature Range (TA = 0°C to +70°C (Note 10)).......................
PAGE 3
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Electrical Characteristics: 2-Wire Interface (2.5V ≤ VDD ≤ 4.5V, TA = -20°C to +70°C, unless otherwise noted.) PARAMETER SYMBOL SCL Clock Frequency fSCL Bus Free Time Between a STOP and START Condition tBUF Hold Time (Repeated) START Condition tHD:STA CONDITIONS (Note 5) (Note 5) MIN 0 TYP MAX UNITS 400 kHz 1.3 µs 0.6 µs Low Period of SCL Clock tLOW 1.3 µs High Period of SCL Clock tHIGH 0.
PAGE 4
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert QUIESCENT CURRENT vs.
PAGE 5
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Pin Configurations TOP VIEW SDA SCL QSTRT ALRT 8 7 6 5 TOP VIEW (BUMPS ON BOTTOM) MAX17043 MAX17044 1 2 3 A SDA SCL CTG B QSTRT N.C. CELL C ALRT VDD GND + MAX17043 MAX17044 + 1 2 3 4 CTG CELL VDD GND TDFN (2mm x 3mm) UCSP Pin Description PIN NAME FUNCTION UCSP TDFN A1 8 SDA Serial Data Input/Output. Open-drain 2-wire data line. Connect this pin to the DATA signal of the 2-wire interface.
PAGE 6
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 SDA tF tLOW tSU:DAT tR tSP tF tR tBUF tHD:STA SCL tHD:STA S tSU:STA tHD:DAT tSU:STO Sr P S Figure 1. 2-Wire Bus Timing Diagram Detailed Description Figure 1 shows the 2-wire bus timing diagram, and Figure 2 is the MAX17043/MAX17044 block diagram. ModelGauge Theory of Operation The MAX17043/MAX17044 use a sophisticated battery model that determines the SOC of a nonlinear Li+ battery.
PAGE 7
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 IC Power-Up When the battery is first inserted into the system, there is no previous knowledge about the battery’s SOC. The IC assumes that the battery has been in a relaxed state for the previous 30min. The first A/D voltage measurement is translated into a best “first guess” for the SOC.
PAGE 8
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 VCELL Register Battery voltage is measured at the CELL pin input with respect to GND over a 0 to 5.00V range for the MAX17043 and 0 to 10.00V for the MAX17044 with resolutions of 1.25mV and 2.50mV, respectively. The A/D calculates the average cell voltage for a period of 125ms after IC POR and then for a period of 500ms for every cycle afterwards. The VCELL register requires 500ms to update after exiting Sleep mode.
PAGE 9
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 MSB—ADDRESS 0Ch LSB—ADDRESS 0Dh RCOMP RCOMP RCOMP RCOMP RCOMP RCOMP RCOMP RCOMP 27 26 25 24 23 22 21 20 MSB LSB SLEEP X ALRT ATHD ATHD ATHD ATHD ATHD 24 23 22 21 20 MSB LSB ATHD UNITS: 1 LSB = 2’S COMPLEMENT 1% ATHD RANGE: 11111b = 1% 00000b = 32% Figure 5. CONFIG Register Format SLEEP (Sleep Bit) Writing SLEEP to logic 1 forces the ICs into Sleep mode. Writing SLEEP to logic 0 forces the ICs to exit Sleep mode.
PAGE 10
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 BATTERY SYSTEM SYSTEM VDD PACK+ 150Ω 1kΩ 4.7kΩ SYSTEM µP CELL VDD INTERRUPT INPUT ALRT MAX17043 PROTECTION IC (Li+/POLYMER) 1µF QSTRT CTG SDA GND SCL EP I2C BUS MASTER 10nF SYSTEM GND PACK- Figure 6. MAX17043 Application Example with Alert Interrupt BATTERY SYSTEM SYSTEM VDD PACK+ 1kΩ SYSTEM PMIC CELL VDD QSTRT 3.
PAGE 11
MAX17043/MAX17044 2-Wire Bus System The 2-wire bus system supports operation as a slave-only device in a single or multislave, and single or multimaster system. Slave devices can share the bus by uniquely setting the 7-bit slave address. The 2-wire interface consists of a serial-data line (SDA) and serialclock line (SCL). SDA and SCL provide bidirectional communication between the MAX17043/MAX17044 slave device and a master device at speeds up to 400kHz.
PAGE 12
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Table 5.
PAGE 13
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Read Data Protocol The read data protocol is used to read to register from the MAX17043/MAX17044 starting at the memory address specified by MAddr. Both register bytes must be read in the same transaction for the register data to be valid. Data0 represents the data byte in memory location MAddr, Data1 represents the data from MAddr + 1, and DataN represents the last byte read by the master: S. SAddr W. A. MAddr. A. Sr.
PAGE 14
1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert MAX17043/MAX17044 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 9/09 Initial release 1 4/10 Updated soldering temperature information; updated CTG pin voltage range to from 0.3V to +12V to -0.