Datasheet LTC3525-3, LTC3525-3.3, LTC3525-5 (Analog Devices)

LTC3525-3/ LTC3525-3.3/LTC3525-5 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect
FeaTures DescripTion
n
Up to 95% Efficiency
The LTC®3525-3/LTC3525-3.3/LTC3525-5 are high efficiency n
Output Disconnect and Inrush Current Limit
synchronous step-up DC/DC converters with output discon- n
Fixed Output Voltages of 3V, 3.3V or 5V
nect that can start up with an input as low as 0.85V. They n
Delivers 65mA at 3V from a 1V Input
offer a compact, high efficiency alternative to charge pumps n
Delivers 60mA at 3.3V from a 1V Input,
in single cell or dual cell alkaline or Li-Ion applications. Only
or 140mA at 3.3V from a 1.8V Input
three small external components are required. The LTC3525 n
Delivers 175mA at 5V from a 3V Input
is offered in fixed output voltages of 3V, 3.3V or 5V. n
Burst Mode® Operation: IQ = 7µA
The device includes a 0.5Ω N-channel MOSFET switch and n Only Three External Components a 0.8Ω P-channel synchronous rectifier. Peak switch current n VIN > VOUT Operation ranges from 150mA to 400mA, depending on load, providing n <1µA Shutdown Current enhanced efficiency. Quiescent current is an ultralow 7µA, n Antiringing Control maximizing battery life in portable applications. n Short-Circuit and Overtemperature Protection n Very Low Profile of 1mm Other features include <1µA shutdown current, anti- n Tiny 6-Lead SC70 Package ringing control and thermal shutdown. The LTC3525 is available in a tiny 6-Lead SC70 package.
applicaTions List of LTC3525 Options
n MP3 Players
PART NAME INPUT START-UP OUTPUT VOUT STATUS IN
n
VOLTAGE VOLTAGE SHUTDOWN MODE
Portable Instruments n LTC3525-3 0.85V 3V Output Disconnect Glucose Meters n LTC3525-3.3 0.85V 3.3V Output Disconnect Digital Cameras LTC3525-5 0.85V 5V Output Disconnect L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the LTC3525D-3.3 0.85V 3.3V Pass Through Mode property of their respective owners. Patents pending. LTC3525L-3 0.7V 3V Output Disconnect
LTC3525-3.3 Efficiency and Power Typical applicaTion Loss vs Load Current
L1* 100 100 10µH 90 80 10 POWER LOSS (mW) LTC3525-3.3 EFFICIENCY VIN VIN SW 70 1V TO 1.6V VOUT OFF ON SHDN V 3.3V OUT 60 1 60mA POWER LOSS GND GND EFFICIENCY (%) 50 1µF 10µF 40 0.1 VIN = 3V 3525 TA01 30 VIN = 2.4V VIN = 1.2V 20 0.01 0.01 0.1 1 10 100 1000 *MURATA LQH32CN100K53 LOAD (mA) LT3525 • TA02 3525fc For more information www.linear.com/LTC3525 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts