Wide Input Voltage Range Boost/SEPIC/Inverting Controller
Features and Benefits
- Wide VIN Range: 1.9V to 18V
- 300kHz Fixed Frequency Current Mode Control
- 1A Rail-to-Rail N-Channel MOSFET Driver
- Low 53mV Current Limit Threshold Voltage Improves Efficiency
- Implements Boost, SEPIC and Flyback Converters Requiring Low Side Power Transistors
- Internal Current Sense Amplifier with Leading Edge Blanking
- Up to 500kHz External Synchronization
- Burst Mode® Operation for High Efficiency at Light Load
- 140µA Quiescent Current
- 15µA Shutdown Current
- 8-Lead MSOP and SO Packages
The LT1619 is a fixed frequency PWM controller for implementing current mode DC/DC converters with minimum external parts. The LT1619 operates with input voltages ranging from 1.9V to 18V and is suitable for a variety of battery-powered and distributed DC/DC converters. The internal rail-to-rail N-channel MOSFET driver operates either from the input in the non-bootstrapped mode or from the output in bootstrapped operation. The driver is designed to drive a low side power transistor in boost, SEPIC, flyback and other topologies.
Converter efficiency is improved at heavy loads with a 53mV current sense voltage and at light load with Burst Mode operation. The operating frequency is internally setat 300kHz. The oscillator can also be synchronized externally up to 500kHz. No load quiescent current is 140µA and shutdown current is 15µA.
The LT1619 is available in 8-lead MSOP and SO packages.
- 3.3V to 5V DC/DC Converters
- Distributed Power Supplies
- Isolated Power Supplies
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.
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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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.