600mA, 1.2MHz Micropower Synchronous Boost Converters in ThinSOT

The LTC3400/LTC3400B are synchronous, fixed frequency, step-up DC/DC converters delivering high efficiency in a 6-lead ThinSOT™ package. Capable of supplying 3.3V at 100mA from a single AA cell input, the devices contain 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 features automatic shifting to power saving Burst Mode operation at light loads, while the LTC3400B features continuous switching at light loads. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode, and the devices feature low shutdown current of under 1µA.

Both devices are available in the low profile (1mm) SOT-23 package.

Features

LTC3400

Burst Mode

LTC3400B

Burst Mode Disabled

LTC3400-1

Connects Vin To Vout In Shutdown

Applications

* Pagers

* MP3 Players

* Digital Cameras

* LCD Bias Supplies

* Handheld Instruments

* Wireless Handsets

* GPS Receivers

* Up to 92% Efficiency

* Generates 3.3V at 100mA from a Single AA Cell

* Low Start-Up Voltage: 0.85V

* 1.2MHz Fixed Frequency Switching

* Internal Synchronous Rectifier

* 2.5V to 5V Output Range

* Automatic Burst Mode® Operation (LTC3400)

* Continuous Switching at Light Loads (LTC3400B)

* Logic Controlled Shutdown (<1µA)

* Antiringing Control Minimizes EMI

* Tiny External Components

* Low Profile (1mm) SOT-23 Package