Product category:
Power Supply ICs and Controllers
News Release from: Solid State Supplies | Subject: LX1918
Edited by the Electronicstalk Editorial
Team on 26 May 2006
Tiny buck regulator claims top
efficiency
Switching at 1MHz with a free running internal oscillator, the LX1918 step-down buck regulator is also very small.
Switching at 1MHz with a free running internal oscillator, the LX1918 step-down buck regulator from Solid State Supplies, in addition to being very fast, is also very small With a footprint of 3 x 3mm it provides designers with an ideal component for use in high efficiency embedded solutions
This article was originally published on Electronicstalk on 6 Feb 2001 at 8.00am (UK)
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The LX1918 has a synchronous rectifier, and all MOSFET switches and compensation components are built in.
The synchronous rectification eliminates the need of an external Schottky diode and gives an efficiency level of better than 95% for a high step-down ratio and a low output voltage.
Input supply voltage ranges from 2.7 to 5.5V with a maximum output current of 1.5A.
The LX1918 is a current mode PWM with optional PFM under light loads and can switch with a 1MHz free running internal oscillator or be synchronised with an external oscillator ranging from 500kHz to 1.25MHz.
Output voltage is programmable with two resistors and can be tightly regulated down to 0.6V.
The mode feature of the component can either maximise efficiency or reduce EMI depending on the needs of the application.
High efficiency (mode = GND) is obtained by allowing the LX1918 to enter a PFM mode with discontinuous inductor current.
Low EMI (mode=VCC) is obtained by only operating in PWM mode even at no load.
Featuring soft start, cycle-by-cycle switch current limit, hiccup short circuit current limiting and thermal shut down, the LX1918 comes in small 8-pin MLP package which is fully RoHS compliant.
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