400mA MicroPower Synchronous Step-up Regulators with Output Disconnect in an SC70

LTC News for Immediate Release
For more information, tel. 408-432-1900
Doug Dickinson, Media Relations Mgr., ext. 2233
John Hamburger, Dir., Mkting Comm., ext. 2419
400mA MicroPower Synchronous Step-up Regulators with
Output Disconnect in an SC70
MILPITAS, CA – October 18, 2005 – 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
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.
400mA MicroPower Synchronous Boost Regulators with
Output Disconnect in an SC70
Page 2
Summary of Features: LTC3525ESC6-3.3/5
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 Range
<1uA Shutdown Current
Short-Circuit and Overtemperature Protection
Very Low Solution Footprint Profile of 1mm
Tiny 6-Pin SC-70 Package
About Linear Technology Corporation
Linear Technology Corporation, a manufacturer of high performance linear integrated
circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500
index of major public companies in 2000. Linear Technology products include high
performance amplifiers, comparators, voltage references, monolithic filters, linear
regulators, DC-DC converters, battery chargers, data converters, communications interface
circuits, RF signal conditioning circuits, and many other analog functions. Applications for
Linear Technology’s high performance circuits include telecommunications, cellular
telephones, networking products such as optical switches, notebook and desktop
computers, computer peripherals, video/multimedia, industrial instrumentation, security
monitoring devices, high-end consumer products such as digital cameras and MP3 players,
complex medical devices, automotive electronics, factory automation, process control, and
military and space systems. For more information, visit www.linear.com
Doug Dickinson, Media Relations Manager
Linear Technology Corporation
1630 McCarthy Boulevard
Milpitas, CA 95035-7417
[email protected]
READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the
company’s web site: http://www.linear.com
Note: LT, LTC, LTM, Burst Mode, and
are registered trademarks of Linear Technology