n 680nA Input Quiescent Current (Output in
Regulation at No Load)
n 1.8V to 5.5V Input Operating Range
n Selectable Output Voltages of 1.8V, 2.5V, 2.8V,
3V, 3.3V, 3.6V, 4.5V, 5V
n Integrated Coulomb Counter Measures
Accumulated Battery Discharge
n ±5% Battery Discharge Measurement Accuracy
n Programmable Peak Input Current of 5mA, 10mA,
15mA, 25mA, 50mA, 100mA, 150mA, 250mA
n Up to 50mA of Output Current
n Up to 90% Efficiency
n Programmable Coulomb Counter Prescaler for Wide
Range of Battery Sizes
n Programmable Discharge Alarm Threshold
n I2C Interface
n Low Profile (0.75mm) 20-Lead (3mm × 4mm) QFN
n Long Lifetime Primary Cell Battery Applications
n Wireless Sensors
n Remote Monitors
n Dust Networks® SmartMesh® Applications
DC/DC with Integrated
The LTC®3335 is a high efficiency, low quiescent current
(680nA) buck-boost DC/DC converter with an integrated
precision coulomb counter which monitors accumulated
battery discharge in long life battery powered applications.
The buck-boost can operate down to 1.8V on its input and
provides eight pin-selectable output voltages with up to
50mA of output current.
The coulomb counter stores the accumulated battery dis-
charge in an internal register accessible via an I2C interface.
The LTC3335 features a programmable discharge alarm
threshold. When the threshold is reached, an interrupt is
generated at the IRQ pin.
To accommodate a wide range of battery types and sizes,
the peak input current can be selected from as low as 5mA
to as high as 250mA and the full-scale coulomb counter
has a programmable range of 32,768:1.
The LTC3335 is available in a 3mm × 4mm QFN-20 package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, SmartMesh and Dust Networks are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
2.2mH TO 47µH
IPEAK = 5mA TO 250mA
1.8V TO 5V
For more information www.linear.com/LTC3335
Efficiency vs Load for 100mA
20 BAT = 3.6V
L = 150µH
DCR = 0.3Ω
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V