LTM4636 Datasheet

• Stacked Inductor Acts as Heat Sink
• Wide Input Voltage Range: 4.7V to 15V
• 0.6V to 3.3V Output Voltage Range
• ±1.3% Total DC Output Voltage Error Over Line, Load and Temperature (–40°C to 125°C)
• Differential Remote Sense Amplifier for Precision Regulation
• Current Mode Control/Fast Transient Response
• Frequency Synchronization
• Parallel Current Sharing (Up to 240A)
• Internal or External Compensation
• 88% Efficiency (12V_IN, 1V_OUT) at 40A
• Overcurrent Foldback Protection
• 16mm × 16mm × 7.07mm BGA Package

• Telecom Servers and Networking Equipment
• Industrial Equipment and Medical Systems

The LTM4636 is a 40A step-down μModule (power module) switching regulator with a stacked inductor as a heat sink for quicker heat dissipation and cooler operation in a small package. The exposed inductor permits direct contact with airflow from any direction. The LTM4636 can deliver 40W (12V_IN, 1V_OUT, 40A, 200LFM) with only 40°C rise over the ambient temperature. Full-power 40W is delivered, up to 83°C ambient and half-power 20W is supported at 110°C ambient.

The LTM4636 operates at 92%, 90% and 88% efficiency, delivering 15A, 30A and 40A, respectively, to a 1V load (12V_IN). The μModule regulator is scalable such that four μModules in current sharing mode deliver 160W with only 40°C rise and 88% efficiency (12V_IN, 1V_OUT, 400LFM). The LTM4636 is offered in a 16mm × 16mm × 7.07mm BGA package.