LTC3400ES6-1

LTC3400-1 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Up to 92% Efficiency Generates 3.3V at 100mA from a Single AA Cell Low Start-Up Voltage: 0.85V VOUT Connected to VIN in Shutdown Internal Synchronous Rectifier 2.5V to 5V Output Range Automatic Burst Mode® Operation Logic Controlled Shutdown (< 1µA) Antiringing Control Minimizes EMI Tiny External Components Low Profile (1mm) SOT-23 Package The LTC®3400-1 is a synchronous, fixed frequency, stepup DC/DC converter delivering high efficiency in a 6-lead ThinSOT™ package. Capable of supplying 3.3V at 100mA from a single AA cell input, the device contains an internal NMOS switch and PMOS synchronous rectifier. A switching frequency of 1.2MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3400-1 features automatic shifting to power saving Burst Mode operation at light loads. In shutdown, VOUT and VIN are connected, which allows the input battery to be used for backup power. The LTC3400-1 features low shutdown current of under 1µA. The LTC3400-1 is offered in the low profile (1mm) SOT-23 package. , LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. US Patent Numbers 5,481,178; 6,580,258; 6,304,066; 6,127,815; 6,498,466; 6,611,131. APPLICATIO S ■ ■ ■ ■ ■ ■ ■ Pagers MP3 Players Digital Cameras LCD Bias Supplies Handheld Instruments Wireless Handsets GPS Receivers TYPICAL APPLICATIO 100 Single Cell to 3.3V Synchronous Boost Converter 90 4.7µH SINGLE AA CELL 4.7µF VIN EFFICIENCY (%) + 80 70 60 50 SW VOUT 1.02M 1% 604k 1% LTC3400-1 OFF ON SHDN GND FB VOUT 3.3V 100mA 4.7µF FIGURE 1 CIRCUIT WITH OPTIONAL SCHOTTKY DIODE (SEE APPLICATIONS INFORMATION) 1 10 100 LOAD CURRENT (mA) 1000 34001 F01a 34001 F01 40 0.1 U Efficiency VIN = 2.4V VIN = 1.5V 34001f U U 1 LTC3400-1 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW SW 1 GND 2 FB 3 6 VIN 5 VOUT 4 SHDN VIN Voltage ................................................. – 0.3V to 6V SW Voltage DC .......................................................... – 0.3V to 6V Pulsed (