Date: 19/02/2010

Synchronous buck-boost dc/dc converter from Linear for high peak power apps

Linear has introduced the LTC3127, a new synchronous buck-boost dc/dc converter that delivers up to 1A of output current to a regulated output voltage with inputs above, below or equal to the output. The LTC3127's input range of 1.8V to 5.5V and output range of 1.8V to 5.25V is compatible with all types of PC card slots, USB and single-cell Li-Ion or dual/triple-cell alkaline/NiCd/NiMH applications.

The key features of the LTC3127 dc/dc converter are,

Programmable (0.2A to 1A) ±4% of accurate average input current limit
1.8V to 5.5V (Input) and 1.8V to 5.25V (Output) voltage range
0.6A of continuous output current: VIN > 1.8V
1A continuous output current: VIN > 3V
Single inductor
Up to 96% efficiency of synchronous rectification
Burst mode operation of IQ = 35µA (pin selectable)
Output disconnect in shutdown
<1µA of shutdown current
Thermal overload protection

The suggested applications for the LTC3127 dc/dc converter are USB powered GSM modems, Supercap charger, handheld test instruments, and wireless terminals.

The LTC3127 includes two N-channel MOSFETs (140mOhm and 160mOhm, respectively) and two P-channel MOSFETs (160mOhm and 190mOhm, respectively) to deliver efficiencies of up to 96%. For applications requiring the low possible noise, the LTC3127 can be configured to run in fixed frequency PWM mode, reducing noise and potential RF interference.

Package: Enhanced 10-Lead (3mm × 3mm × 0.75mm) DFN & 12-Lead MSOP package
Price:
LTC3127EDD: Each $2.95 for 1k pieces
LTC3127EMSE: Each $3.00 for 1k pieces
Availability: Now in stock

For more details visit www.linear.com