The LTM4640 is a complete 20A step-down switching mode power μModule® (micromodule) regulator in a tiny 6.25mm × 6.25mm × 5.07mm BGA package.
The LTM4640 package includes the switching controller, the power MOSFETs, an inductor, and the supporting components. Operating over an input voltage range of 3.1V to 20V, the LTM4640 supports an output voltage range of 0.6V to 3.3V, set by a single external resistor. Its high-efficiency design delivers up to 20A continuous output current. Only bulk input and output capacitors are needed.
The LTM4640 supports selectable discontinuous conduction mode (DCM) operation and output voltage tracking for supply rail sequencing. Its high switching frequency and controlled on-time valley current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. Fault protection features include overvoltage and overtemperature protection.
The LTM4640 is available with a RoHS-compliant terminal finish.
Key Features and Benefits
- Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
- Wide Input Voltage Range: 3.1V to 20V
- 0.6V to 3.3V Output Voltage
- Up to 20A DC output current
- ±1.5% Maximum Total DC Output Voltage Error
- Differential Remote Sensing Amplifier
- Fast Transient Response
- External Frequency Synchronization
- Multiphase Parallel Current Sharing with upnto 4 × LTM4640s
- Power Good Indicator
- Overvoltage and Overtemperature Protection
- 49-Pin, 6.25mm × 6.25mm × 5.07mm, BGA package
- Pin compatible with LTM4626, LTM4638, and LTM4657
Applications
- Telecom, Datacom, Networking, and Industrial Equipment
- Medical Diagnostic Equipment
- Data Storage Rack Units and Cards
- Test and Debug Systems
Evaluation Board
The LTM4640 can be evaluated with the DC3107A.
Block Diagrams and Tables
Featured Parts
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