Linear Technology Corporation announces the LTM4648, a 2.375VIN to 5.5VIN, 10A step-down µModule (micromodule) regulator in a 9mm x 15mm x 4.92mm BGA package with high operating efficiency and low temperature rise. With an integrated 5V boost converter to drive the gates of its N-channel MOSFETs from low VIN supplies, the LTM4648 improves efficiency and simplifies system design by eliminating the need for 5V or 12V power rails and dependency on auxiliary regulators. Applications include point-of-load conversion from a 3.3V main power bus and battery-powered systems in telecom, medical, industrial, avionics and portable test equipment.
At full power (10A, full range of VOUT and VIN) is delivered when operating from 0°C to 85°C ambient temperature, while the LTM4648 requires no heat sink or airflow nor is its output current derated. Half-power occurs at high ambient temperature of 110°C (TJMAX=125°C). The µModule regulator operates at up to 91% efficiency (3.3VIN or 5VIN, 1.5VOUT at 10A). 95% efficiency is achieved when converting 3.3VIN to 2.5VOUT at 10A.
The LTM4648 regulates output voltages adjustable from 0.6V to 5V. Equipped with a differential remote sense amplifier to compensate for voltage droop due to circuit board trace impedance, the LTM4648 regulates a load voltage with ±1.5% accuracy over line, load and temperature (-40°C to 125°C).
The LTM4648 provides input and output clocks for multiphase operation among multiple devices to accurately current share for up to 40A load. Multiphase operation reduces input and output ripple as well as the number of input and output capacitors.
The LTM4648 is synchronizable to an external clock ranging in frequency from 400kHz to 750kHz. With options for Burst Mode operation for the highest conversion efficiency at light load and pulse-skipping operation for lower output voltage ripple, gives users the option to personalize a circuit’s performance. The LTM4648 permits output voltage tracking for sequencing multiple rails in a system. To protect the load, the LTM4648 features output overvoltage and overcurrent protection.
Summary of Features: LTM4648
10A DC Output Current
Input Voltage Range: 2.375V to 5.5V
Output Voltage Range: 0.6V Up to 5V
No Heat Sink or Current Derating Up to 85°C Ambient Temperature
±1.5% Maximum Total DC Output Error
Multiphase Operation with Current Sharing
Remote Sense Amplifier
Built-In Temperature Monitor
Selectable Pulse-Skipping Mode/Burst Mode
9mm x 15mm x 4.92mm BGA
Linear Technology Corporation
Filed Under: Power Electronic Tips, Capacitors