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Solutions Power Management PMIC & Multifunction Multitopology DC/DC
Solutions Power Management Switching Regulator Step-Down (Buck) Regulators Buck Regulator Plus LDO
Solutions Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

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400mA, 2.25MHz Synchronous Step-Down DC/DC Converter with Dual 150mA LDOs in a 2mm x 2mm DFN

MILPITAS, CA - September 5, 2007 - Linear Technology announces the LTC3672B-1 and LTC3672B-2. Both parts have a 400mA, 2.25 MHz, synchronous buck regulator and two 150mA LDOs packaged in a 2m x 2mm DFN. The LTC3672B-1 has a fixed 1.8V output on the switching regulator and fixed 1.2V and 2.8V outputs for the LDOs, whereas the LTC3672B-2 has a fixed 1.2V output on the switcher and fixed 1.8V and 2.8V LDOs. Both parts are ideal for Digital Media Broadcasting (DMB) and Digital Video Broadcasting (DVB) chipsets found in the latest generation of cell phones and PDAs. The input voltage range of 2.9V to 5.5V makes them an ideal solution for single cell Li-Ion powered applications. The 1.2V, 1.8V and 2.8V outputs are used to power I/O, memory and core voltages of the latest DMB, DVB processors, as well many standardized DSPs and microcontrollers. The buck regulator's 2.25MHz switching frequency and the LDO designs enable the utilization of tiny, low cost externals, providing a very compact solution footprint for handheld applications.

The LTC3672B's synchronous buck delivers efficiencies as high as 93% and constant frequency, current mode operation minimizes noise while offering fast transient response. The LTC3672B-1's LDOs can be powered from the synchronous switcher's output to maximize efficiency and reduce output ripple. Other features include internal soft-start and internal compensation.

The LTC3672B-1 and LTC3672B-2 are both available from stock in 8-lead 2mm x 2mm DFN package. Pricing starts at $1.95 each in 1,000-piece quantities.

 
Summary of Features: LTC3672B-1/-2
•  Triple Output Supply From a Single 2.9V to 5.5V Input
•  LTC3672-1
       •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
•  LTC3672-2
       •Buck DC/DC: Fixed 1.2V Output, Up to 400mA
       •LDO1: Fixed 2.8V Output, Up to 150mA
       •LDO2: Fixed 1.8V Output, Up to 150mA
•  ±2.5% Reference Accuracy
•  Constant-Frequency 2.25MHz Operation
•  Low Quiescent Current Standby: IQ = 260uA Operation
•  Minimum External Component Count
•  Current Mode Operation for Excellent Line and Load Transient Response
•  Internal Soft-Start for Each Output
•  Single Enable Pin Controls All Three Outputs
•  Tiny 2mm x 2mm x 0.75mm DFN-8 Package
 

Triple Output Converter in Just
2mm x 2mm DFN-8 LTC3672B-1-2 PR Image

Click Photo for High-Res Image