Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3770
Edited by the Electronicstalk Editorial Team on 04 April 2005
Controller claims fast transient
response
The LTC3770 is a synchronous step-down DC/DC controller with fast transient response, high output accuracy, integrated tracking and sequencing functions, and output margining capability.
Linear Technology has introduced the LTC3770, a synchronous step-down DC/DC controller with fast transient response, high output accuracy, integrated tracking and sequencing functions, and output margining capability The LTC3770's constant-on-time valley-current-mode architecture, combined with a very low minimum on-time (50ns typical), allows the control loop to respond instantly to load steps
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3770 uses current mode control and can operate without a sense resistor by sensing the voltage drop across the synchronous power MOSFET.
For systems where control of the maximum output current is important, a conventional sense resistor can be used in the source of the lower MOSFET.
For either case the current limit is user-programmable, allowing optimum system efficiency and excellent control over the maximum output current.
The LTC3770 is capable of operating at very low duty cycles; outputs as low as 0.6V can be supplied from input voltages as high as 32V.
The operating frequency is selected by a single external resistor.
For applications that require constant-frequency operation, a phase lock loop allows the LTC3770 to be synchronised to an external clock.
The LTC3770 output voltage accuracy is specified at +/-0.5% at room temperature and +/-0.67% from 0 to +85C.
Tracking and sequencing functions allow the user to optimise the startup of multiple power supplies, and margining capability provides the user with the ability to stress the load circuitry with overvoltage and undervoltage conditions during production testing.
An open-drain power-good output provides fault condition feedback.
The LTC3770 is offered in two packages: 5 x 5mm QFN and 28-lead SSOP.
It is rated for operation from -40 to +85C. Request a free brochure from Linear Technology Corp ...
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