Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3812-5
Edited by the Electronicstalk Editorial Team on 27 September 2007
Controller simplifies step-down supplies
Switching regulator controller directly steps down voltages from 60V to output voltages ranging from 0.8V to 93% of the input.
The LTC3812-5 is a high-input-voltage synchronous step-down switching regulator controller that directly steps down voltages from 60V to output voltages ranging from 0.8V to 93% of the input Using a single inductor, the device employs a constant-on-time valley current mode control architecture to deliver very low duty cycles and extremely fast transient response with accurate cycle-by-cycle current limit without requiring a sense resistor
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3812-5's strong onboard 1ohm gate drivers minimise switching transient losses associated with driving MOSFETs at high frequency and high voltage.
To optimise the size of inductors and capacitors, the switching frequency is selectable from 100kHz to 1MHz.
The LTC3812-5 can be configured for pulse skipping operation to maintain high efficiency at light loads.
Its 0.8V reference has +/-0.75% accuracy over the operating temperature range of -40 to +85C.
The programmable soft-start allows users to adjust the startup time.
Integrated bias control generates gate drive power from the input supply during startup with the addition of a small external SOT23 MOSFET.
Additional features include a power-good signal, shutdown, undervoltage lockout and output overvoltage protection.
Applications include 48V power conversion in telecomms and basestation power supplies, networking equipment as well as automotive, industrial control and avionics systems that must be compliant with high input voltage surges.
The LTC3812-5 is offered in a 16-lead thermally enhanced SSOP package.
Pricing for 1000-piece quantities begin at US $3.25 each. Request a free brochure from Linear Technology Corp ...
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