Features and Benefits
- Input Voltage Range: 2.5V to 18V
- Runs Down to VIN = 250mV After Start-Up
- Output Voltage Range: 0.8V to 18V
- 5A Output Current in Buck Mode, VIN > 6V
- 3A Output Current for VIN = 3.6V, VOUT = 5V
- Programmable Switching Frequency: 400kHz to 2MHz
- Synchronizable with an External Clock Up to 2MHz
- Accurate Run Comparator Threshold
- Burst Mode® Operation, No-Load IQ = 35μA
- Ultralow Noise Buck-Boost PWM
- Current Mode Control
- Maximum Power Point Control
- Power Good Indicator
- Internal Soft-Start
- 28-Lead 4mm × 5mm QFN and TSSOP Packages
The LTC3119 is a high efficiency 18V monolithic buck-boost converter that can deliver up to 5A of continuous output current. Extensive feature integration and very low resistance internal power switches minimize the total solution footprint for even the most demanding applications. A proprietary 4-switch PWM architecture provides seamless low noise operation from input voltages above, equal to, or below the output voltage.
External frequency programming as well as synchronization using an internal PLL enable operation over a wide switching frequency range of 400kHz to 2MHz. The wide 2.5V to 18V input range is well suited for operation from unregulated power sources including battery stacks and backup capacitors. After start-up, operation is possible with input voltages as low as 250mV.
Other features include: output short-circuit protection, thermal overload protection, less than 3μA shutdown current, power good indicator, Burst Mode operation, and maximum power point control.
The LTC3119 is offered in thermally enhanced 28-lead 4mm × 5mm QFN and TSSOP packages.
- Wide Input Range Power Supplies
- 1- to 4-Cell Lithium Battery Powered Products
- RF Power Supplies
- Solar Battery Chargers
- System Backup Power Supplies
- Lead Acid to 12V Regulator
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 (1)
Demonstration circuit 2129A features the LTC3119, an 18V, 5A synchronous buck/boost DC/DC converter. The DC2129A has been designed for an input voltage range of 2.5V to 18V with an output voltage (VOUT) set to 5V. For VIN > 5V the output current can be as high as 5A. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below, or equal to the output 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:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
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.