Features

• Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
• Wide V_IN Range: 4.5V to 36V
• Wide V_OUT Range: 0.8V to 34V
• I_OUT: 4A DC (10A DC in Buck Mode)
• Up to 98% Efficiency
• Current Mode Control
• Power Good Output Signal
• Phase-Lockable Fixed Frequency: 200kHz to 400kHz
• Ultrafast Transient Response
• Current Foldback Protection
• Output Overvoltage Protection
• Small Surface Mount Footprint, Low Profile
  (15mm × 15mm × 2.82mm) LGA and
  (15mm × 15mm × 3.42mm) BGA Packages
• SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish

Typical Application

Description

The LTM®4609 is a high efficiency switching mode buckboost power supply. Included in the package are the switching controller, power FETs and support components. Operating over an input voltage range of 4.5V to 36V, the LTM4609 supports an output voltage range of 0.8V to 34V, set by a resistor. This high efficiency design delivers up to 4A continuous current in boost mode (10A in buck mode). Only the inductor, sense resistor, bulk input and output capacitors are needed to finish the design.

The low profile package enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The high switching frequency and current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The LTM4609 can be frequency synchronized with an external clock to reduce undesirable frequency harmonics.

Fault protection features include overvoltage and foldback current protection. The DC/DC μModule® regulator is offered in small 15mm × 15mm × 2.82mm LGA and 15mm × 15mm × 3.42mm BGA packages. The LTM4609 is available with SnPb (BGA) or RoHS compliant terminal finish.