Boost, flyback or SEPIC controller for high-temperature, 175C operation

Boost, flyback or SEPIC controller for high-temperature, 175C operation

New Products |
By Graham Prophet

Its 2.5V to 36V input voltage range is intended for high temperature applications such as oil exploration drilling equipment with power sources ranging from 3V to 36V. The LTC1871X’s electrical parameters are 100% tested at 175°C, offering a VREF accuracy of ±2% over the entire –40°C to 175°C temperature range. The LTC1871X’s flexibility for use in boost, SEPIC or flyback topologies is suitable for a range of battery-powered applications commonly found in downhole drilling applications. Its Burst Mode operation offers low quiescent current, for applications that require extended operating battery life. Specialized Cu/Ni/Au bond pad plating ensures long life in high temperature environments while an MSOP-10 package offers a highly compact solution footprint.


It is priced at $125.00 (1,000).


Analog Devices/Linear Technology;


next page; feature listing

Summary of Features: LTC1871X


100% tested at 175°C

±2% reference accuracy over –40°C to 175°C range

High efficiency (no sense resistor required)

Wide input voltage range: 2.5V to 36V

Current mode control provides excellent transient response

High maximum duty cycle (92% typ)

±2% RUN pin threshold with 100 mV hysteresis

Micropower shutdown: IQ = 10 μA

Programmable operating frequency (65 kHz to 900 kHz) with one external resistor

Synchronizable to an external clock up to 1.3 × fOSC

User-controlled pulse-skipping or burst mode operation

Internal 5.2V low dropout voltage regulator

Output overvoltage protection

Capable of operating with a sense resistor for high output voltage applications

Small 10-lead MSOP package



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