Features and Benefits
- Dual 25A or Single 50A Output
- Input Voltage Range: 4.5V to 16V
- Output Voltage Range: 0.6V to 5.5V
- ±1% Maximum Total DC Output Error Over Line, Load and Temperature
- Higher Light Load Efficiency and Wider VOUT Range Than LTM4650-1
- Adjustable Control Loop Compensation
- Differential Remote Sense Amplifier
- Current Mode Control/Fast Transient Response
- Multiphase Parallel Current Sharing Up to 300A
- Internal Temperature Monitor
- Adjustable Switching Frequency or Synchronization
- Overcurrent Foldback Protection
- Selectable Burst Mode® Operation, Pulse-Skipping Mode Operation
- Soft-Start/Voltage Tracking
- Output Overvoltage Protection
- 16mm × 16mm × 5.01mm BGA Package
The LTM4650A-1 is a dual 25A or single 50A output switching mode step-down DC/DC μModule® (micromodule) regulator with ±1% total DC output error. Included in the package are the switching controllers, power FETs, inductors and all supporting components. Operating from an input voltage range of 4.5V to 16V, the LTM4650A-1 supports two outputs with an output voltage range of 0.6V to 5.5V, each set by a single external resistor. Its high efficiency design delivers up to 25A continuous current for each output. Only a few input and output capacitors are needed. Adjustable control loop compensation allows for fast transient response to minimize output capacitance when powering FPGAs, ASICs, and processors.
Fault protection features include overvoltage and overcurrent protection. The LTM4650A-1 is offered in 16mm × 16mm × 5.01mm BGA package.
|Vin Range||Vout Range||Comp||DC Vout Accy|
|LTM4650||4.5V to 15V||0.6V to 1.8V||Internal||1.5%|
|LTM4650-1B||4.5V to 15V||0.6V to 1.8V||External||1.5%|
|LTM4650-1A||4.5V to 15V||0.6V to 1.8V||External||0.8%|
|LTM4650A||4.5V to 16V||0.6V to 5.5V||Internal||1%|
|LTM4650A-1||4.5V to 16V||0.6V to 5.5V||External||1%|
- Telecom and Networking Equipment
- Storage and ATCA Cards
- Industrial 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 (2)
Demonstration circuit 2268A-I is a high efficiency, high density, dual 8A, switch mode step-down power supply on a compact 1.5' × 1.2' PCB. It features the LTM4650A-1 μModule® regulator. The input voltage is from 4.5V to 16V. The output voltage is programmable from 0.6V to 5.3V. DC2268A-I can deliver up to 25A maximum in each channel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the resistor jumper (R1/R2) selects pulse-skipping mode for noise sensitive applications or Burst-Mode® in less noise sensitive applications. Two outputs can be connected in parallel for a single 50A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. Remote output voltage sensing is available for improved output voltage regulation at the load point. An optional input inductor L1 reduces the EMI noise for noise sensitive applications. DC2268A can be easily inserted to an edge connector for testing and debugging. These features and the availability of the LTM4650A-1 in a compact 16mm × 16mm × 4.41mm LGA package make it ideal for use in many high-density point-of-load regulation applications. The LTM4650A-1 data sheet must be read in conjunction with this demo manual for working on or modifying the DC2268A-I.
Demonstration circuit 2603A-B features the LTM4650AEY-1, the high efficiency, high density, dual 25A, single 50A switch mode step-down power module regulator. The input voltage is from 4.5V to 16V. The output voltage is programmable from 0.6V to 5.5V. DC2603A-B can deliver 25A maximum current from each channel. The board designs with minimum components to demonstrate this high efficiency, high density μModule®. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP1) selects pulse-skipping mode for noise sensitive applications or Burst Mode® operation in less noise sensitive applications. Two outputs can be connected in parallel for a single 50A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally or ratiometrically track with another supply’s output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the availability of the LTM4650AEY-1 in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load applications. The LTM4650A-1 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2603A-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.
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.
LTpowerCAD Project Files
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.