The LTC3335 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 discharge in an internal register accessible via an I2C interface.

The LTC3335 from Linear Technology is a high efficiency synchronous buck-boost converter that delivers up to 50mA of continuous output current. With only 680nA of quiescent current and programmable peak input currents from as low as 5mA up to as high as 250mA, the device is ideal for a wide variety of low power battery applications.

This device’s 1.8V to 5.5V input range and eight user-selectable outputs between 1.8V and 5V can provide a regulated output supply with input voltage above, below or equal to the output. In addition, the device’s integrated precision coulomb counter (±5% battery discharge measurement accuracy) provides accurate monitoring of accumulated battery discharge in long-life primary cell applications that have extremely flat battery discharge curves. The full-scale coulomb counter has a programmable range of 32,768:1.

Typical applications include remote sensors and monitors, and Linear Technology’s Dust Networks® SmartMesh® wireless sensor network systems. The LTC3335 includes four internal low RDSON MOSFETs and can deliver efficiency of up to 90%. Other features include a programmable discharge alarm threshold, an I2C interface for accessing coulomb count and device programming, a power good output, and eight selectable peak input currents.

The LTC3335 is available in both an E and I grade with an operating junction temperature range from –40°C to 125°C in a thermally enhanced, 20-lead 3mm x 4mm QFN package. Pricing starts at $3.35 each for the E-grade at 1,000-piece quantities and all versions are available from stock.

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

 

For more information, visit www.linear.com/product/LTC3335.

Summary of Features of the LTC3335:

·  680nA Input Quiescent Current (Output in Regulation at No Load)

·  1.8V to 5.5V Input Operating Range

·  Selectable Output Voltages of 1.8V, 2.5V, 2.8V, 3V, 3.3V, 3.6V, 4.5V, 5V

·  Integrated Coulomb Counter Measures Accumulated Battery Discharge

·  ±5% Battery Discharge Measurement Accuracy

·  Programmable Peak Input Current of 5mA, 10mA, 15mA, 25mA, 50mA, 100mA, 150mA & 250mA

·  Up to 50mA of Output Current

·  Up to 90% Efficiency

·  Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes

·  Programmable Discharge Alarm Threshold

·  I 2C Interface

·  Low Profile (0.75mm) 20-Lead 3mm × 4mm QFN Package

 

Typical Application

 

 

 

 

 

 

 

 

 

 

 

Applications

 

  • Long Lifetime Primary Cell Battery Applications
  • Wireless Sensors
  • Remote Monitors
  • Dust Networks® SmartMesh® Applications

 

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule products, and many other analog functions.  Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

 

Linear Technology (UK) Limited
Tel: +44 (0)1628 477066

E-mail: uksales@linear.com

Web site: www.linear.com

Website for product information:  www.linear.com/product/LTC3335