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 elim-

inates the need for battery relearn cycles and an exter-

nal current-sense resistor. Temperature compensation

is possible in the application with minimal interaction

between a µC and the device.

A quick-start mode provides a good initial estimate of

the battery’s SOC. This feature allows the IC to be

located on system side, reducing cost and supply

chain constraints on the battery. Measurement and esti-

mated capacity data sets are accessed through an I

interface. The MAX17043/MAX17044 are available in

either a 0.4mm pitch 9-bump UCSP™ or 2mm x 3mm,

8-pin TDFN lead-free package.

Applications

Features

o Host-Side or Battery-Side Fuel Gauging

1 Cell (MAX17043)

2 Cell (MAX17044)

o Precision Voltage Measurement

±12.5mV Accuracy to 5.00V (MAX17043)

±30mV Accuracy to 10.00V (MAX17044)

o Accurate Relative Capacity (RSOC) Calculated

from ModelGauge Algorithm

o No Offset Accumulation on Measurement

o No Full-to-Empty Battery Relearning Necessary

o No Sense Resistor Required

o External Alarm/Interrupt for Low-Battery Warning

o 2-Wire Interface

o Low Power Consumption

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

Package or Tiny 0.4mm Pitch 9-Bump UCSP

Package

MAX17043/MAX17044

Compact, Low-Cost 1S/2S Fuel Gauges

with Low-Battery Alert

________________________________________________________________

Maxim Integrated Products

Ordering Information

Li+

PROTECTION

CIRCUIT

MAX17043

MAX17044

CELL

1µF

1kΩ

10nF

150Ω

GND

CTG

SCL

SDA

QSTRT

ALRT

SYSTEM

µP

C BUS

MASTER

INTERRUPT

4.7kΩ

Simplified Operating Circuit

19-4811; Rev 3; 10/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

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

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

T = Tape and reel.

EP = Exposed pad.

Smartphones

MP3 Players

Digital Still Cameras

Digital Video Cameras

Portable DVD Players

GPS Systems

Handheld and Portable

Applications

ModelGauge is a trademark of Maxim Integrated Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.

Summary of content (14 pages)

PAGE 1
9-4811; Rev 3; 10/10 KIT ATION EVALU E L B AVAILA Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert Features o Host-Side or Battery-Side Fuel Gauging 1 Cell (MAX17043) 2 Cell (MAX17044) o Precision Voltage Measurement ±12.5mV Accuracy to 5.00V (MAX17043) ±30mV Accuracy to 10.
PAGE 2
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 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
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert (2.5V ≤ VDD ≤ 4.5V, TA = -20°C to +70°C.) PARAMETER SYMBOL SCL Clock Frequency f SCL 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 0.6 µs Setup Time for a Repeated START Condition t SU:STA 0.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SIMPLE C/2 RATE CYCLES SOC ACCURACY TA = +70°C 90 80 STATE OF CHARGE (%) TA = +25°C 60 40 20 TA = -20°C 4 60 2 50 0 40 -2 30 -4 -6 REFERENCE SOC: SOLID LINE 0 2 3 4 5 0 -10 4 6 8 10 12 SIMPLE C/4 RATE CYCLES SOC ACCURACY MAX17043 VOLTAGE ADC ERROR vs.
PAGE 5
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 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 × 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 2wire interface. This pin has a 0.
PAGE 6
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert SDA tF tLOW tSU:DAT tR tSP tF tR tBUF tHD:STA SCL tHD:STA tSU:STA tHD:DAT S 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
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 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. Initial error caused by the battery not being in a relaxed state fades over time, regardless of cell loading following this initial conversion.
PAGE 8
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 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
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert LSB—ADDRESS 0Dh MSB LSB SLEEP X ALRT ATHD ATHD 24 23 ATHD ATHD 22 21 MSB ATHD 20 LSB ATHD UNITS: 1 LSB = 2’S COMPLEMENT 1% ATHD RANGE: 11111b = 1% 00000b = 32% Figure 5. CONFIG Register Format SLEEP (Sleep Bit) ATHD (Alert Threshold) Writing SLEEP to logic 1 forces the ICs into Sleep mode. Writing SLEEP to logic 0 forces the ICs to exit Sleep mode. The power-up default value for SLEEP is logic 0.
PAGE 10
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert BATTERY SYSTEM SYSTEM VDD PACK+ 150Ω 1kΩ 4.7kΩ SYSTEM µP CELL VDD INTERRUPT INPUT ALRT PROTECTION IC (Li+/POLYMER) MAX17043 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 PROTECTION IC (Li+/POLYMER) 3.
PAGE 11
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert The 2-wire bus system supports operation as a slaveonly 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
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert Table 5.
PAGE 13
Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert S. SAddr W. A. MAddr. A. Sr. SAddr R. A. Data0. A. Data1. A... DataN. N. P Data is returned beginning with the MSB of the data in MAddr. Because the address is automatically incremented after the LSB of each byte is returned, the MSB of the data at address MAddr + 1 is available to the host immediately after the acknowledgment of the data at address MAddr.
PAGE 14
MAX17043/MAX17044 Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert Revision History PAGES CHANGED REVISION NUMBER REVISION DATE 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.