DC/DC Converter offers output disconnect and soft start.

Press Release Summary:

Current-mode, synchronous-boost, 500 kHz Model LTC3429 provides inrush current limiting. Internal 0.35 and 0.45 ohm switches provide 600 mA current limit and deliver output voltage up to 5 V from input voltage of 0.5-4.4 V. Unit delivers loads up to 100 mA of continuous output current from single alkaline cell. Synchronous rectification enables efficiencies up to 96%, while Burst Mode® operation lowers quiescent current to 20 µA.

Original Press Release:

600mA, 500kHz Synchronous ThinSOT Boost Regulator Offers Output Disconnect & SoftStart

MILPITAS, CA - March 8, 2004 - Linear Technology announces the LTC3429, a 500kHz, current mode, synchronous boost DC/DC converter with true output disconnect, inrush current limiting and integrated softstart capability. Its internal 0.35 Ohm (N-Channel) and 0.45 Ohm (P-Channel) switches provide a guaranteed 600mA current limit and can deliver an output voltage as high as 5V from an input voltage range of 0.5V to 4.4V, making it ideal for Li-Ion and single or multicell alkaline/NiMH applications. The LTC3429 can deliver up to 100mA of continuous output current (at 3.3V) from a single alkaline cell. Synchronous rectification enables efficiencies of up to 96% while Burst Mode® operation lowers quiescent current to only 20uA, providing maximum battery run time in handheld applications. A constant switching frequency of 500kHz minimizes both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits inrush current during start-up, minimizing surge currents seen by the input supply. Additional features include anti-ringing control, short-circuit protection, softstart, and thermal protection. LTC3429 delivers an ideal solution for boost applications that require up to 200mA of output current and where a small solution size and low maximum battery run-time are defining factors.

LTC3429ES6 is available from stock in a 6-lead ThinSOT package and 1,000-piece pricing starts at $1.95 each.

Summary of Features: LTC3429ES6
Up to 96% Efficiency
True Output Disconnect
Inrush Current Limited with Internal Soft-Start
Low Start-Up Voltage: 0.85V
Automatic Burst Mode Operation with IQ<20uA
Internal Synchronous Rectifier
Current Mode Control with Internal Compensation
Short Circuit Protection
500kHz Fixed Frequency Switching
VIN: 0.5V to 4.4V (Up to 5V with Schottky)
Low Profile (<1mm) SOT-23 Package

Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.

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