Features and Benefits
- Small Solution Size
- >85% Efficiency over Wide Load Range
- Internal Synchronous Rectifier
- VIN Range: 1.5V to 5.5V
- 5V at 30mA from 3.3V Input
- 3.3V at 20mA from 2 AA Cell Input
- Programmable Output Voltages Up to 10V
- Burst Mode Operation
- Inrush Current Limiting
- Output Disconnect in Shutdown
- Ultralow Quiescent (10µA) and Shutdown (<1µA) Currents
- Low Proﬁle 2mm × 2mm DFN, 2mm × 3mm DFN or SOT-23 Package
The LTC3459 is a low current, high efficiency synchronous boost converter intended for low power, size constrained portable applications. The LTC3459 can be powered from a single lithium ion battery, a 2- to 3-cell stack of Alkaline or Nickel batteries, or any low impedance voltage source between 1.5V and 5.5V. The output is programmable via an external divider between 2.5V and 10V. Although the part is primarily intended for boost applications, VOUT will maintain regulation below VIN (at reduced efficiency).
The LTC3459 offers Burst Mode operation with a fixed peak current, providing high conversion efficiency over a wide range of load currents. During start-up, inductor current is controlled preventing the inrush surge current found in many boost converters. In shutdown the output is disconnected from the input and quiescent current is reduced to <1µA.
The LTC3459 is offered in low proﬁle 6-pin 2mm × 2mm DFN, 2mm × 3mm DFN or SOT-23 (ThinSOT) packages, allowing a tiny footprint for the total solution.
- General Purpose Micropower Boost
- Digital Cameras
- LCD Bias
- Small OLED Displays
- Supercap Charging
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
DC2042A - Demo Board for:
LTC3588-1 Piezoelectric Energy Harvesting Power Supply
LTC3108 Ultralow Voltage Step-Up Converter and Power Manager
LTC3105 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up
LTC3459 10V Micropower Synchronous Boost Converter in ThinSOT
LTC2935 Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
The DC2080 is a versatile energy harvesting demo board that is capable of accepting piezoelectric, solar, 4mA to 20mA loops, thermal powered energy sources or any high impedance AC or DC source. The board contains four independent circuits consisting of the following EH ICs:
- LTC3588-1: Piezoelectric Energy Harvesting Power Supply
- LTC3108: Ultralow Voltage Step-Up Converter and Power Manager
- LTC3105: Step-Up DC/DC Converter with Power Point Control and LDO Regulator
- LTC3459: 10V Micropower Synchronous Boost Converter
- LTC2935-2 and LTC2935-4: Ultralow Power Supervisor with Power-Fail Output Selectable Thresholds
The board is designed to connect to the Silicon Labs EFM32™ Wonder Gecko Starter Kit (Part No:EFM32WG-STK3800). It also includes two energy harvester transducers (TEG and Solar) and a terminal block for connecting a high impedance AC source. In addition, many turrets are provided, making it easy to connect additional transducers to the board. The board contains multiple jumpers that allow the board to be configured in various ways. The standard build for the board has 4 jumpers installed out of the possible 12 jumpers. The board is very customizable to the end users’ needs. This compatibility makes it a perfect evaluation tool for any low power energy harvesting system. Please refer to the individual data sheets for the operation of each power management circuit. The application section of the demo manual describes the system level functionality of this board and the various ways it can be used in early design prototyping.
Demonstration circuit 703 features the LTC3459 10V micropower synchronous boost converter. The circuit in DC703 is designed to generate an 8V output from a 1.8V to 5.5V input voltage range. The maximum output current is 40mA and is dependent on the input voltage.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.