Product category:
Power Supply ICs and Controllers
News Release from: Solid State Supplies | Subject: LX1741
Edited by the Electronicstalk Editorial
Team on 17 June 2002
Boost controller saves space, power and
cost
A novel high-efficiency boost controller for battery-powered applications features pseudo-hysteretic pulse frequency modulation to deliver better than 85% efficiency, cut board size and lower cost.
A new high-efficiency, high-voltage boost controller for battery-powered applications, the LX1741 from Solid State Supplies, features a pseudo-hysteretic pulse frequency modulation topology designed to deliver greater than 85% efficiency, reduce board size and lower cost Ideal for pagers, mobile phones, PDAs, handheld computers and LED drivers, the LX1741's design is targeted specifically to provide enhancements that improve overall performance under very light load currents by implementing control circuitry optimised for portable systems
This article was originally published on Electronicstalk on 6 Feb 2001 at 8.00am (UK)
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Its quiescent supply current is typically only 80uA, and shutdown current is less than 1uA.
Designers have maximum flexibility in respect to their system's efficiency and cost, by their choice of external N-channel mosfets to use with the LX1741.
Start-up operation is guaranteed at 1.6V input, and with an input range that extends to 6.0V, the LX1741 allows for a wide selection of system battery designs.
Output voltage is programmed easily with two external resistors in conjunction with the feedback pin.
Depending on the choice of mosfets, the LX1741 is capable of achieving output voltages much higher than 40V.
A simple dynamic adjustment of output voltage is achieved by an analogue reference signal or direct PWM input signal applied to the ADJ pin.
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