Features and Benefits
- High Efficiency: Up to 96%
- Very Low Quiescent Current: 55μA Total
- 2.25MHz Constant Frequency Operation
- Low Dropout Operation: 100% Duty Cycle
- Low-Ripple (Typical 30mVP-P) Burst Mode® Operation
- Peak Current-Mode Control Architecture for Excellent Line and Load Transient Response
- Wide Voltage Input Range: 4.5V to 15V
- 600mA/Channel Rated Output Current
- 0.6V Reference Allows Low Output Voltages
- ±1.5% Output Voltage Accuracy
- Ultralow Shutdown Current: IQ < 1μA
- Internal Compensation
- Power Good Outputs
- Externally Frequency Synchronization (1MHz to 4MHz)
- Independent Internal Soft-Start for Each Channel
- Small 16-Lead Thermally Enhanced Thin QFN (3mm × 3mm) and MSE Packages
The LTC3607 is a 15V dual 600mA monolithic synchronous step-down regulator which has only 55μA quiescent current. Intended for a variety of applications, including dual lithium-ion battery products, it operates from a wide 4.5V to 15V input voltage range. It features a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to VIN. The internal synchronous power switches provide high efficiency without the need for external Schottky diodes.
A user selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise.
To further the maximize battery run time, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle). In shutdown, the device draws <1μA.
- Dual Lithium-Ion Battery Supplies
- Automotive Applications
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 (2)
Demonstration circuit 1847 is a dual output regulator based on the LTC3607 monolithic dual channel synchronous buck regulator. The DC1847 has an input voltage range of 4.5V to 15V, with each regulator capable of delivering up to 600mA of output current. The DC1847 can operate in either Burst Mode® or pulse-skipping mode. In shutdown, the DC1847 can run off of less than 1μA total. The DC1847 is a very efficient circuit: up to 90%. The DC1847 uses the 16-Pin MSOP LTC3607 package, which has an exposed pad on the bottom-side of the IC for good thermal performance.
Demonstration circuit DC1596 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3607 monolithic dual channel synchronous buck regulator. The DC1596 has an input voltage range of 4.5V to 15V, with each regulator capable of delivering up to 600mA of output current. The DC1596 can operate in either Burst Mode® operation or pulse-skipping mode. In shutdown, the DC1596 quiescent current is less than 1μA. The DC1596 is a very efficient circuit attaining up to 90%. The DC1596 uses the LTC3607’s 16-lead QFN package,which has an exposed pad on the bottom side of the IC for better thermal performance. These features, plus a set operating frequency range of 2.25MHz, make the DC1596 demo board an ideal circuit for industrial or distributed power applications.
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:
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
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.