LTC3402 2A, 3MHz Micropower Synchronous Boost Converter FEATURES DESCRIPTIO Synchronous Rectification: Up to 97% Efficiency The LTC 3402 is a high efficiency, fixed frequency, step- 2A Switch Current Rating up DC/DC converter that operates from an input voltage Fixed Frequency Operation Up to 3MHz below 1V. The device includes a 0.16 N-channel MOSFET Wide Input Range: 0.5V to 5V switch and a 0.18 P-channel synchronous rectifier. Very Low Quiescent Current: 38A (Burst Mode Switching frequencies up to 3MHz are programmed with Operation) an external timing resistor and the oscillator can be 2.6V to 5.5V Adjustable Output Voltage synchronized to an external clock. An external Schottky 0.85V (Typ) Start-Up Voltage diode is optional but will slightly improve efficiency. No External Schottky Diode Required (V < 4.3V) OUT Quiescent current is only 38A in Burst Mode operation, Synchronizable Switching Frequency maximizing battery life in portable applications. Burst Burst Mode Enable Control Mode operation is user controlled and can be enabled by Antiringing Control Reduces Switching Noise driving the MODE/SYNC pin high. If the MODE/SYNC pin PGOOD Output has either a clock or is driven low, then fixed frequency OPTI-LOOP Compensation switching is enabled. Very Low Shutdown Current: <1A Other features include a 1A shutdown, antiringing con- Small 10-Pin MSOP Package U trol, open-drain power good output, thermal shutdown APPLICATIO S and current limit. The LTC3402 is available in the 10-lead thermally enhanced MSOP package. Lower current appli- Cellular Telephones cations should use the 1A rated LTC3401 synchronous Handheld Computers boost converter. Applications that require V < 2.6V OUT MP3 Players should use the LTC3424. 2-Way Pagers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. GPS Receivers Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. Battery Backup Supplies CCFL Backlights TYPICAL APPLICATIO All Ceramic Capacitor 2-Cell to 3.3V at 1A Step-Up Converter Efficiency L1 100 Burst Mode 2.2H V V = 1.8V to 3V OUT IN 90 OPERATION 3.3V 1A 80 1MHz LTC3402 3 4 70 CONSTANT R2 V SW IN FREQUENCY 909k 60 10 7 SHDN V OUT 50 + 2 C2 2 8 40 CELLS MODE/SYNC FB 44F (2 22F) 6 30 9 PGOOD V C C3 R1 20 C1 1 5 470pF 549k 10F R GND t 10 V = 2.4V WITH SCHOTTKY IN R R5 C4 0 t 0.1 100 1000 30.1k 82k 4.7pF 110 I (mA) OUT 3402 TA02 C1: TAIYO YUDEN JMK212BJ106MG 3402 TA01 0 = FIXED FREQ C2: TAIYO YUDEN JMK325BJ226MM 1 = Burst Mode OPERATION L1: COILCRAFT: D03316P-222 3402fb 1 EFFICIENCY (%) U ULTC3402 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) V , V Voltages ...................................... 0.5V to 6V ORDER PART IN OUT TOP VIEW SW Voltage ................................................. 0.5V to 6V NUMBER R 1 10 SHDN t V , R Voltages ......................... 0.5V to (V + 0.3V) C t OUT MODE 2 9 V C LTC3402EMS V 3 8 FB IN PGOOD, SHDN, FB, MODE Voltages ........... 0.5V to 6V SW 4 7 V OUT Operating Temperature Range (Note 2) .. 40C to 85C GND 5 6 PGOOD MS PACKAGE Storage Temperature Range ................. 65C to 125C 10-LEAD PLASTIC MSOP MS PART MARKING Lead Temperature (Soldering, 10 sec).................. 300C T = 125C JMAX LTSK = 130C/ W 1 LAYER BOARD JA Order Options Tape and Reel: Add TR = 100C/ W 4 LAYER BOARD JA Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: