Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8833 and MAX885
Edited by the Electronicstalk Editorial
Team on 11 December 2007
Step-down regulators take switches
onboard
The use of internal MOSFETs enables these devices to operate efficiently from low input voltages, which is not possible with large, discrete MOSFETs.
Maxim describes its MAX8833 and MAX8855 as the industry's first step-down regulators to operate from 3.3 or 2.5V inputs, provide dual 3 or 5A outputs (respectively), and integrate switches that maximise space savings In addition to saving space, the use of internal MOSFETs enables these devices to operate efficiently from low input voltages, which is not possible with large, discrete MOSFETs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Internal MOSFETs provide much better performance in low-voltage applications compared with their discrete counterparts, which require higher voltages for full enhancement.
With low on-resistances of 49 and 37mohm, respectively, the MAX8833 and MAX8855 are capable of providing efficiencies in the mid-90% range while switching above 1MHz.
The low on-resistance, high efficiency, and small package of these devices make them ideal for DDR power supplies, processors that require more than one rail, and high-end enterprise equipment.
To increase design flexibility, each device provides a programmable frequency up to 2MHz and an external frequency-synchronisation input.
An external reference input enables the implementation of tracking applications, such as DDR power supplies, by allowing one channel to power Vddq while the tracking channel powers Vtt.
Programmable soft-start for each channel supports a wide range of outputs, further enhancing flexibility.
Additionally, a separate power-good signal and enable input for each output ensure simple sequencing.
The MAX8833 and MAX8855 also combine a high-bandwidth, voltage-error amplifier with high-frequency switching to allow the use of ceramic capacitors that have minimal values.
The MAX8833 and MAX8855 are fully specified over the -40 to +85C extended temperature range.
Each device is available in a 5 x 5mm, 32-pin TQFN package to allow interchangeability as current requirements change.
Pricing starts at US $2.59 for the MAX8833 and $3.41 for the MAX8855 (10,000-up).
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