680nA IQ Buck-Boost Converter Counts Coulombs

680nA I Q Buck-Boost Converter
Counts Coulombs
LTC3335
VIN = 1.8V to 5.5V
VOUT = 1.8V to 5V
0 0 0 1 0
Q
IOUT up to 50mA
Battery
Coulomb Counter
Buck-Boost
Converter
I2C
Load
Accurate Coulomb Measurement of Battery Usage
The LTC®3335 provides a simple and accurate means to monitor battery state of charge while producing a regulated
output. This buck-boost converter contains an integrated precision coulomb counter which is easily accessible via an
I2C interface. The converter draws only 680nA quiescent current from the battery and offers a number of common fixed
output voltage settings to eliminate the need for external resistors. It also features a programmable input current limit
and delivers output currents up to 50mA at up to 90% efficiency.
Features
• 680nA Input Quiescent Current
• Input Voltage Range: 1.8V to 5.5V
• ±5% Accurate Coulomb Counter
Measures Accumulated Battery
Discharge
• Selectable Outputs: 1.8V, 2.5V, 2.8V,
3V, 3.3V, 3.6V, 4.5V & 5V
• Programmable Peak Input Current
• Up to 50mA of Output Current at
90% Efficiency
Total Unadjusted
Coulomb Counter Error
5
3
Info & Free Samples
www.linear.com/product/LTC3335
VOUT = 1.8V
VOUT = 3.3V
VOUT = 5V
4
1-800-4-LINEAR
2
Error (%)
1
0
–1
–2
–3
–4
–5
1.8
2.3
2.8
3.3
3.8
4.3
4.8
Battery Voltage (V)
5.3
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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