LTC2959

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Ultra-Low Power

Battery Gas Gauge

The LTC®2959 is an ultra-low power battery gas gauge

that accurately measures charge, voltage, current and

temperature. Its wide input voltage range and its low

operating current make the LTC2959 suitable for many

applications, including duty-cycled systems that operate

over long lifetime.

A precision coulomb counter integrates current through

an external sense resistor connected at any point in the

battery current path. A 16-bit ADC can be configured to

measure voltage, current, temperature and/or an auxiliary

input in single-shot, duty-cycled (1S/52s) or continuous

mode (2.5kS/s). The measurements are stored in internal

The LTC2959 features programmable high and low

thresholds and min/max tracking registers. If a threshold

is exceeded, the device sets a flag in the internal status

register and communicates an alert using the SMBus alert

protocol when configured as such.

48V High-Side Sensing Coulomb Counter

Operating Current vs Temperature

APPLICATIONS

n

Operating Supply Current <1.0µA

n

Supply Voltage from 1.8V to 60V

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0V to 60V Sense Voltage for Low-Side or High-Side

Sensing

n

Fast 16-bit ADC Measures Voltage, Current and

Temperature

n

1% Voltage, Current and Charge Accuracy

n

No Crystal or other Time Reference Required

n

Programmable Deadband Prevents Charge Drift

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Includes Battery Voltage Watchdog

n

Includes Precision Temperature Sensor

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Programmable Alerts and Min/Max Tracking

Registers

n

Auxiliary ADC Input for Sensor Readout

n

n

Available in Small 10-Lead 3mm × 2mm DFN

Package

n

Remote Sensors

n

Energy Harvesting Systems

n

Low-Power Handheld Products

n

Power Tools

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COULOMB COUNTER ON, ADC OFF

TEMPERATURE (°C)

–50

–25

0

25

50

75

100

0

1

2

3

4

5

6

7

8

9

10

2959 TA01b

CHARGER/LOAD

2k

2k

2k

50m

48V

BATTERY

2959 TA01a

1µF

100nF

470nF

GND

3.3V

µP

SENSEP

SCL

SDA

GPIO

LTC2959

GND

SENSEN

CFN

CFP