Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3834/-1
Edited by the Electronicstalk Editorial
Team on 14 March 2008
Step-down DC/DC controller is most
frugal
Drawing only 30uA in sleep mode, the LTC3834/-1 is ideal for preserving battery energy in "always-on" automotive systems or battery-powered devices.
The LTC3834/-1 is a synchronous step-down DC/DC controller, claimed by Linear Technology to exhibit the industry's lowest quiescent current Drawing only 30uA in sleep mode, the LTC3834/-1 is ideal for preserving battery energy in "always-on" automotive systems or battery-powered devices where the system remains semi-active, or when a car's engine is off
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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When in shutdown mode, the LTC3834/-1 draws a mere 4uA.
This controller is the latest addition to Linear Technology's lineup of over 20 ultralow-quiescent-current DC/DC switching regulator controllers for step-down, step-up, buck-boost, SEPIC and inverter topologies.
The input supply range of the LTC3834/-1 at 4 to 36V is wide enough to protect against high input voltage transients and it continues to operate during automotive cold crank.
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It can provide an output voltage from 0.8 to 10V, making it ideal for the higher voltage supplies typically required for audio systems, satellite receivers, analogue tuners and CD/DVD players.
This controller has an onboard LDO for bias power and a powerful onboard MOSFET driver to deliver up to 20A load current at efficiencies as high as 95%.
The LTC3834/-1's constant frequency, current mode architecture provides excellent line and load regulation.
The device features a very low dropout voltage, with up to 99% duty cycle and smoothly ramps the output voltage during startup with its adjustable soft-start and tracking features.
The operating frequency is adjustable from 250 to 530kHz, and can be synchronised to an external clock from 140 to 650kHz using its phased-locked loop (PLL).
In addition, the user can select from continuous, pulse skipping or Burst Mode operation at light loads.
Output overvoltage and overcurrent (short circuit) protection are integrated and the LTC3834/-1 features +/-1% reference voltage accuracy over an operating temperature range of -40 to +85C.
The LTC3834/-1 is available in two versions.
The LTC3834 version has a power good output voltage monitor and an input that allows the IC to be powered from its output for maximum efficiency.
It is also features PolyPhase operation that enables multiple ICs to be synchronised out-of-phase to minimise the required input and output capacitances.
The LTC3834 is offered in 20-lead TSSOP and 4 x 5mm QFN packages, whereas the LTC3834-1 is housed in the smaller 16-pin SSOP and 5 x 3mm DFN packages.
Pricing for 1000-piece quantities starts at US $3.69 each. Request a free brochure from Linear Technology Corp ...
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