LTC3400-1 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT FEATURES DESCRIPTIO Up to 92% Efficiency The LTC 3400-1 is a synchronous, fixed frequency, step- Generates 3.3V at 100mA from a Single AA Cell up DC/DC converter delivering high efficiency in a 6-lead Low Start-Up Voltage: 0.85V ThinSOT package. Capable of supplying 3.3V at 100mA V Connected to V in Shutdown from a single AA cell input, the device contains an internal OUT IN Internal Synchronous Rectifier NMOS switch and PMOS synchronous rectifier. 2.5V to 5V Output Range A switching frequency of 1.2MHz minimizes solution Automatic Burst Mode Operation footprint by allowing the use of tiny, low profile inductors Logic Controlled Shutdown (<1A) and ceramic capacitors. The current mode PWM design is Antiringing Control Minimizes EMI internally compensated, reducing external parts count. Tiny External Components The LTC3400-1 features automatic shifting to power sav- Low Profile (1mm) SOT-23 Package ing Burst Mode operation at light loads. In shutdown, V OUT U and V are connected, which allows the input battery to be IN APPLICATIO S used for backup power. The LTC3400-1 features low shutdown current of under 1A. Pagers MP3 Players The LTC3400-1 is offered in the low profile (1mm) Digital Cameras SOT-23 package. LCD Bias Supplies Handheld Instruments , LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. Wireless Handsets US Patent Numbers 5,481,178 6,580,258 6,304,066 6,127,815 6,498,466 6,611,131. GPS Receivers TYPICAL APPLICATIO Efficiency 100 Single Cell to 3.3V Synchronous Boost Converter 90 V = 2.4V IN 4.7H 80 V = 1.5V IN + SINGLE 4.7F AA CELL SW V OUT 70 V V 3.3V IN OUT 100mA 1.02M LTC3400-1 1% 60 OFF ON SHDN FB 4.7F 604k GND FIGURE 1 CIRCUIT 50 1% WITH OPTIONAL SCHOTTKY DIODE (SEE APPLICATIONS INFORMATION) 40 34001 F01 0.1 1 10 100 1000 LOAD CURRENT (mA) 34001 F01a 34001f 1 EFFICIENCY (%) U ULTC3400-1 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART V Voltage ................................................. 0.3V to 6V IN TOP VIEW NUMBER SW Voltage SW 1 6 V IN DC .......................................................... 0.3V to 6V LTC3400ES6-1 GND 2 5 V OUT Pulsed (<100ns) ......................................0.3V to 7V FB 3 4 SHDN SHDN, FB Voltage ....................................... 0.3V to 6V S6 PACKAGE S6 PART MARKING V ........................................................... 0.3V to 6V 6-LEAD PLASTIC TSOT-23 OUT LTBJM Operating Temperature Range (Note 2) .. 30C to 85C T = 125C, = 102C/W JMAX JC Storage Temperature Range ................... 65C to 125 Lead Temperature (Soldering, 10 sec).................. 300C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 1.2V, V = 3.3V, unless otherwise specified. A IN OUT PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Start-Up Voltage I = 1mA 0.85 1 V LOAD Minimum Operating Voltage SHDN = V (Note 4) 0.5 0.65 V IN Output Voltage Adjust Range 2.5 5 V Feedback Voltage 1.192 1.23 1.268 V Feedback Input Current V = 1.25V (Note 3) 1 nA FB Quiescent Current (Burst Mode Operation) V = 1.4V (Note 5) 19 30 A FB Quiescent Current (Shutdown) V = 0V, Not Including Switch Leakage, V = V 0.01 1 A SHDN IN OUT Quiescent Current (Active) Measured On V 300 500 A OUT NMOS Switch Leakage V = 5V 0.1 5 A SW PMOS Switch Leakage V = 0V (Note 3) 0.1 A SW NMOS Switch On Resistance V = 3.3V 0.35 OUT V = 5V 0.20 OUT PMOS Switch On Resistance V = 3.3V 0.45 OUT V = 5V 0.30 OUT NMOS Current Limit 600 850 mA Burst Mode Operation Current Threshold (Note 3) 3 mA Current Limit Delay to Output (Note 3) 40 ns Max Duty Cycle V = 1.15V 80 87 % FB Switching Frequency 0.95 1.2 1.5 MHz 0.85 1.2 1.5 MHz SHDN Input High 1V SHDN Input Low 0.35 V SHDN Input Current V = 5.5V 0.01 1 A SHDN Note 1: Absolute Maximum Ratings are those values beyond which the life Note 3: Specification is guaranteed by design and not 100% tested in of a device may be impaired. production. Note 2: The LTC3400-1 is guaranteed to meet performance specifications Note 4: Minimum V operation after start-up is only limited by the IN from 0C to 70C. Specifications over the 30C to 85C operating batterys ability to provide the necessary power as it enters a deeply temperature range are assured by design, characterization and correlation discharged state. with statistical process controls. Note 5: Burst Mode operation I is measured at V . Multiply this value Q OUT by V /V to get the equivalent input (battery) current. OUT IN 34001f 2 U WWW