LTC3672B-1 - Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

The LTC3672B-1 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs), where one of the LDOs can be powered from the buck output to improve efficiency. Constant-frequency 2.25MHz operation is maintained down to very light loads. The input supply range of 2.9V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Polymer applications, and for powering low voltage ASICs from 3.3V or 5V rails.

The LTC3672B-1 regulates 1.8V at the buck output, 1.2V at the LDO1 output, and 2.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-1.

The LTC3672B-1 is available in a 2mm x 2mm x 0.75mm 8-Lead DFN package.

Features
  • Triple Output Supply From a Single 2.9V to 5.5V Input
  • Buck DC/DC: Fixed 1.8V Output, Up to 400mA
  • LDO1: Fixed 1.2V Output, Up to 150mA
  • LDO2: Fixed 2.8V Output, Up to 150mA
  • ±2.5% Reference Accuracy
  • Constant Frequency 2.25MHz Operation
  • Minimum External Component Count
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Internal Soft-Start for Each Output
  • Single Enable Pin Turns On/Shuts Down All Three Outputs
  • Tiny 2mm x 2mm x 0.75mm DFN Package
Typical Application

Applications
  • DMB Cellphones
  • Handheld Products (PDA, PMP, GPS)
  • Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, CPUs, and RF Chipsets
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3672BEDC-1#PBF2x2 DFN-8E$2.79
LTC3672BEDC-1#TRMPBF2x2 DFN-8E$2.79$2.00
LTC3672BEDC-1#TRPBF2x2 DFN-8E$2.79$1.95
Datasheet
Reliability Data
Press Release
Related Product
LTC3672B-1 - Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN
R457 - Reliability Data
LTC3672B-1/LTC3672B-2 - 400mA、2.25MHz 同步降压型 DC/DC 转换器,具双路 150mA LDO 及采用 2mm x 2mm DFN 封装
LTC3672B-1 Footprints and Symbols