Features and Benefits
- Dual 10A or Single 20A Output
- Wide Input Voltage Range: 4.5V to 20V
- 2.375VMIN with CPWR Bias
- Output Voltage Range: 0.6V to 5.5V
- ±1.5% Maximum Total DC Output Error
- Multiphase Current Sharing
- Differential Remote Sense Amplifier, Each Channel
- Current Mode Control/Fast Transient Response
- Up to 96% Efficiency
- Adjustable Switching Frequency (250kHz to 1.3MHz)
- Frequency Synchronization
- Overcurrent Foldback Protection
- Output Overvoltage Protection
- Internal or External Compensation
- Built-In Temperature Monitoring Diode
- SnPb or RoHS Compliant Finish
- 11.25mm × 15mm × 5.01mm BGA Package
The LTM4646 is a complete dual 10A output switching mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductors, and all supporting components. Operating from an input voltage range of 4.5V to 20V, the LTM4646 supports two outputs each with an output voltage range of 0.6V to 5.5V, set by external resistors. Its high efficiency design delivers up to 10A continuous current for each output. Only a few input and output capacitors are needed.
The device supports frequency synchronization, multiphase operation, high efficiency light load operation and output voltage tracking for supply rail sequencing and has an on-board temperature diode per channel for device temperature monitoring. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.
Fault protection features include overvoltage and overcurrent protection. The power module is offered in a small footprint 11.25mm × 15mm × 5.01mm BGA package. The LTM4646 is available with SnPb or RoHS compliant terminal finish.
- Point-of-Load Power Supplies
- Telecom and Networking Equipment
- Industrial Equipment
- Medical Equipment
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 2527A-B features the LTM4646EY, a dual 10A or single 20A high efficiency, switch mode step-down power μModule regulator. The input voltage range is from 4.5V to 20V. With CPWR bias, input voltage can be as low as 2.375V. The output voltage range is 0.6V to 5.5V. De-rating is necessary for certain VIN, VOUT, frequency and thermal conditions. The DC2527A-B offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE_PLLIN jumper can select discontinuous conduction mode. The MODE_PLLIN pin also allows the LTM4646 to synchronize to an external clock signal (between 300kHz and 1.3MHz). DC2527A-B has the option of choosing both internal and external compensation circuit for LTM4646. Tying the PHASMD pin to different pins generates certain phases of CLKOUT and Channel2. The LTM4646 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2527A-B.
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.
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.