The LTM4657EY#PBF from Analog Devices is a complete 8A step-down DC/DC μModule regulator. It integrates the switching controller, power MOSFETs, inductor, and supporting components into a compact package, reducing the number of external components and simplifying power-supply design. Only bulk input and output capacitors and an output-setting resistor are normally required.
The device operates from a wide 3.1V to 20V input-voltage range and supports an adjustable 0.5V to 5.5V output-voltage range. It delivers up to 8A of continuous output current and provides a maximum total DC output-voltage error of ±1.5% over line, load, and temperature.
LTM4657 uses current-mode control for fast transient response and supports external frequency synchronization, multiphase parallel current sharing, output-voltage tracking, supply sequencing, selectable discontinuous-mode operation, and a power-good indicator. Its default switching frequency is 500kHz and can be adjusted using an external resistor.
Integrated protection functions include output overvoltage, overcurrent, and overtemperature protection. A differential remote-sense amplifier helps compensate for PCB voltage drops and improves regulation accuracy at the load.
The LTM4657EY#PBF is supplied in a 49-ball BGA package measuring 6.25 × 6.25 × 3.87mm. This model uses SAC305 lead-free solder balls, is RoHS compliant, and carries an MSL 3 rating. Its ordering temperature range is listed as -40°C to +125°C. For the E-grade device, performance specifications are guaranteed from 0°C to 125°C, while operation from -40°C to 125°C is supported by design, characterization, and statistical correlation.
Key Specifications:
- Manufacturer: Analog Devices
- Manufacturer Part Number: LTM4657EY#PBF
- Device Type: Step-Down DC/DC μModule Regulator
- Number of Outputs: 1
- Input-Voltage Range: 3.1V to 20V
- Output-Voltage Range: 0.5V to 5.5V
- Continuous Output Current: Up to 8A
- Total DC Output Error: ±1.5% Maximum
- Default Switching Frequency: 500kHz
- Control Architecture: Current-Mode Control
- Output Programming: Single External Feedback Resistor
- Remote Sensing: Differential Remote-Sense Amplifier
- Parallel Operation: Multiphase Current Sharing
- Sequencing Features: Soft Start and Output Tracking
- Status Output: Power-Good Indicator
- Protection Features: Overvoltage, Overcurrent, and Overtemperature
- Package: 49-Ball BGA
- Package Dimensions: 6.25 × 6.25 × 3.87mm
- Temperature Range: -40°C to +125°C
- Moisture Sensitivity Level: MSL 3
- Ball Finish: SAC305 Lead-Free Alloy
- Environmental Compliance: RoHS-Compliant Lead-Free Version
Typical Applications:
Suitable for telecommunications, datacom and networking equipment, industrial systems, medical diagnostic equipment, data-storage rack units and cards, test and debug systems, and point-of-load supplies for FPGAs, ASICs, processors, and other digital loads. Thermal conditions, PCB layout, input-to-output voltage ratio, and output-current derating should be evaluated in the final design.
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