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|LTC3525-3.3/-5 : 400mA MicroPower Synchronous Step-up Regulators with
Output Disconnect in an SC70|
MILPITAS, CA – Linear Technology announces the LTC3525-3.3
and LTC3525-5, 400mA synchronous step-up DC/DC converters with true output disconnect and inrush current limiting in
SC70 packages. They operate from an input voltage range of 1V to 4.5V, making them ideal for single- and multicell
alkaline/NiCd/NiMH, as well as Li-Ion applications. The LTC3525 -3.3 offers a fixed 3.3V output whereas the
LTC3525-5 has a fixed 5V output. The LTC3525-3.3 can deliver up to 140mA of continuous output current from dual AA
alkaline cells. The LTC3525-5 can deliver up to 175mA at 5V from a 3V input. Both devices use synchronous
rectification to enable efficiencies of up to 95%. Their Burst Mode® operation lowers quiescent current to only 7uA,
providing maximum battery run-time in handheld applications. The combination of an SC70 package plus only 3 tiny
externals provides small solution footprints as required in space constrained applications.
The LTC3525-3.3 and
LTC3525-5 both incorporate internal switches with an RDS(ON) of only 0.5 Ohm (N-Channel) and 0.8 Ohm (P-Channel).
Combined with their unique Adaptive Power Control switching topology, they deliver efficiencies greater than 90% to
loads varying from 1mA to 100mA. Both parts offer output disconnect and inrush current limiting to restrict the
current during start-up, minimizing surge currents seen by the input supply. Additional features include
anti-ringing control, short-circuit protection and thermal protection. The LTC3525-3.3 and LTC3525-5 deliver ideal
solutions for boost applications requiring up to 150mA of output current, and where a small solution size and
maximum battery run-time are defining factors.
Both the LTC3525ESC6-3.3 and the LTC3525ESC6-5 are
available from stock in a 6-Lead SC70 package. 1,000-piece pricing starts at $1.75 each.
* Up to 95% Efficiency
* Output Disconnect &
Inrush Current Limit
* Fixed Output Voltages of 3.3V or 5V
* Delivers 60mA at 3.3V from a
1V Input, or 140mA at 3.3V from a 1.8V Input
* Delivers 175mA at 5V from a 3V Input
Burst Mode Operation: IQ = 7uA
* Only Three External Components
* 1V to 4.5V Input
* <1uA Shutdown Current
* Short-Circuit and Overtemperature Protection
* Very Low Solution Footprint Profile of 1mm
* Tiny 6-Pin SC-70 Package
Miércoles, 19 Octubre, 2005 - 12:19