POWER LOSS (mW) LTC3528B-2 1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm 3mm DFN FEATURES DESCRIPTION n Delivers 3.3V at 200mA from a Single Alkaline/ The LTC 3528B-2 is a synchronous, fixed frequency NiMH Cell or 3.3V at 400mA from Two Cells step-up DC/DC converter with output disconnect. High n V Start-Up Voltage: 700mV efficiency synchronous rectification, in addition to a 700mV IN n 0.50V to 5.5V Input Range start-up voltage and operation down to 500mV once n 1.6V to 5.25V V Range started, provides longer run-time for single or multiple OUT n Up to 94% Efficiency cell battery-powered products. n Output Disconnect A switching frequency of 2MHz minimizes solution n 2MHz Fixed Frequency Operation footprint by allowing the use of tiny, low profile induc - n V > V Operation IN OUT tors and ceramic capacitors. The current mode PWM is n Integrated Soft-Start internally compensated, simplifying the design process. n Current Mode Control with Internal Compensation The LTC3528B-2 features continuous switching at light n Low Noise PWM Operation loads. Anti-ringing circuitry reduces EMI by damping the n Internal Synchronous Rectifier inductor in discontinuous mode. Additional features include n Logic Controlled Shutdown: <1A a low shutdown current, open-drain power good output, n Anti-Ringing Control short-circuit protection and thermal overload protection. n Low Profile (2mm 3mm 0.75mm) DFN Package The LTC3528B-2 is offered in an 8-lead 2mm 3mm APPLICATIONS 0.75mm DFN package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Medical Instruments ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Flash-Based MP3 Players n Noise Canceling Headphones n Wireless Mice n Bluetooth Headsets TYPICAL APPLICATION Efficiency and Power Loss 100 1000 V = 3.3V OUT 90 V = 2.4V 2.2H IN 80 70 SW V 100 OUT EFFICIENCY V IN V V 3.3V 60 IN OUT 1.8V TO 3.2V 400mA 499k 68pF 4.7F 50 LTC3528B-2 POWER LOSS 40 PGOOD FB 10F 10 30 OFF ON SHDN 287k GND 20 35282 TA01a 10 0 1 0.1 1 10 100 1000 LOAD CURRENT (mA) 35282 TA01b 3528b2fa 1 EFFICIENCY (%)LTC3528B-2 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V Voltage ................................................... 0.3V to 6V TOP VIEW IN SW Voltage SHDN 1 8 V DC ............................................................ 0.3V to 6V IN FB 2 7 SGND Pulsed < 100ns ........................................ 0.3V to 7V 9 PGOOD 3 6 PGND SHDN, FB Voltage ........................................ 0.3V to 6V V 4 5 SW OUT V ............................................................. 0.3V to 6V OUT PGOOD ......................................................... 0.3V to 6V DDB PACKAGE 8-LEAD (3mm 2mm) PLASTIC DFN Operating Junction Temperature Range T = 125C, = 76C/W (NOTE 6) JMAX JA (Notes 2, 5) ............................................ 40C to 125C EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB Junction Temperature ........................................... 125C Storage Temperature Range ................... 65C to 125C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3528BEDDB-2 PBF LTC3528BEDDB-2 TRPBF LDPB 8-Lead (3mm 2mm) Plastic DFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: