Datasheet LTC3526L, LTC3526LB (Analog Devices)

LTC3526L/LTC3526LB 550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN FeAtures Description n
Delivers 3.3V at 100mA from a Single Alkaline/
The LTC®3526L/LTC3526LB are synchronous, fixed
NiMH Cell or 3.3V at 200mA from Two Cells
frequency step-up DC/DC converters with output discon- n
VIN Start-Up Voltage: 680mV
nect. Synchronous rectification enables high efficiency in n
1.5V to 5.25V VOUT Range
the low profile 2mm × 2mm DFN package. Battery life in n
Up to 94% Efficiency
single AA/AAA powered products is extended further with n
Output Disconnect
a 680mV start-up voltage and operation down to 500mV n
1MHz Fixed Frequency Operation
once started. n
VIN > VOUT Operation
A switching frequency of 1MHz minimizes solution foot- n
Integrated Soft-Start
print by allowing the use of tiny, low profile inductors n Current Mode Control with Internal Compensation and ceramic capacitors. The current mode PWM design n Burst Mode® Operation with 9µA IQ (LTC3526L) is internally compensated, reducing external parts count. n Low Noise PWM Operation (LT3526LB) The LTC3526L features Burst Mode operation at light load n Internal Synchronous Rectifier conditions allowing it to maintain high efficiency over a n Logic Controlled Shutdown (IQ < 1µA) wide range of load. The LTC3526LB features fixed frequency n Anti-Ring Control operation for low noise applications. Anti-ring circuitry n Low Profile (2mm × 2mm × 0.75mm) reduces EMI by damping the inductor in discontinuous DFN-6 Package mode. Additional features include a low shutdown current ApplicAtions of under 1µA and thermal shutdown. The LTC3526L/LTC3526LB are housed in a 2mm × 2mm n Medical Instruments × 0.75mm DFN package. n Noise Canceling Headphones L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Wireless Mice property of their respective owners. n Bluetooth Headsets typicAl ApplicAtion
Efficiency and Power Loss vs Load Current
100 1000 V 4.7µH IN = 2.4V 90 EFFICIENCY 80 100 SW POWER LOSS (mW) 70 V VOUT IN VIN VOUT 1.6V TO 3.2V 3.3V 60 10 200mA 4.7µF LTC3526L 1.78M 50 POWER LOSS OFF ON SHDN FB 4.7µF 40 1 GND EFFICIENCY (%) 1M 30 3526l TA01a 20 0.1 10 0 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 3526l TA01b 3526lfc Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts