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Regulator delivers up to 400mA

Posted: 26 Jan 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LTC3444? buck-boost regulator? W-CDMA? wideband-code division multiple access? Linear Technology?

Linear Technology unveiled a synchronous buck-boost regulator, which has been designed for use in 3G W-CDMA cellphone applications. The new LTC3444 can deliver up to 400mA of continuous output current to outputs between 0.5V and 5V from a single cell Li-ion input. According to the company, its boost function is particularly important for the 3G W-CDMA high speed data (HSDPA) mode in which the RF power amplifier requires a nominal 4.2V from a Li-ion input. The buck-boost design is said to enable the regulator to operate from input voltages above, below and equal to the output voltage. The topology incorporated in the IC provides a continuous high efficiency transfer function through all operating modes, making the device suitable for single cell Li-ion 3G W-CDMA applications where the output voltage can vary over a wide range. Additionally, its 1.5MHz switching frequency allows the utilization of tiny, low cost ceramic capacitors and inductors.

The LTC3444's buck-boost design yields efficiencies of up to 92 percent. High efficiency is also attained at very low output voltages while also eliminating external components. Its high speed error amplifier and current mode architecture provide the fast transient response required to slew the RF power amplifier from standby to transmit in less than 25s. Other features include output disconnect in shutdown, over-voltage protection, internal soft-start and thermal shutdown.

The LTC3444EDD is available from stock in a 3-by-3mm DFN-8 package. Pricing starts at $2.40 each in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3444 Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications ICs, Interface



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