Linear Unveils LTC3546 Dual-Channel Regulator

Linear Technology has introduced a dual-channel synchronous buck regulator that can deliver either dual 2A outputs or 3A from one channel and 1A from the other, with up to 96 per cent efficiency. Using a constant-frequency, current-mode architecture, the LTC3546 operates from an input-voltage range of 2.25V to 5V, making it suitable for single-cell Li-ion/polymer or multi-cell alkaline/NiCad/NiMH applications.

Each output is adjustable from 0.6V to 5V and has turn-on supply tracking. Separate Run and Power Good PINs enable independent control of each channel. The LTC3546's switching frequency can be set at 2.25MHz or is programmable from 750kHz to 4MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 4mm x 5mm QFN-28 package and its high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

The LTC3546's design consists of 2A and 1A primary synchronous switches and a 1A dependent synchronous output switch, which can be externally connected to either of the primary outputs to produce either 3A and 1A outputs or dual 2A outputs. The 2A primary switch can be run either in phase with the additional switches or 180 degrees out of phase via an external phase pin. The LT3546's Burst Mode operation minimises quiescent current to 160uA (both channels on) in no-load conditions. The current threshold at which Burst Mode operation begins can be independently programmed for each channel, optimising overall efficiency.

For applications demanding very low noise, the LTC3546 can also be run in pulse skipping or forced continuous modes to minimise output ripple. The LTC3546 offers a Power Good indicator and is synchronisable to an external clock. Other features include an external synchronisation capability and over-temperature and short-circuit protection. The LTC3546EUFD is available in a 4mm x 5mm QFN-28 and is priced at USD3.75 (GBP2.28) each in 1,000-piece quantities. The industrial-grade version - LTC3546IUFD - is tested and guaranteed to operate from a -40C to +125C operating junction temperature and is priced at USD4.41 in 1,000-piece quantities. All versions are available from stock.

Comments

Post a Comment

Popular posts from this blog

Han® HC 250 high current contact

A Powerful Solution HARTING has developed the new Han® HC 250high current connector as a powerful interface that impresses by requiring little space, transmitting high current intensities and allowing flexible configuration of the number of poles. The HC 250 one-pole crimp module can be connected in various frame geometries to produce the required number of poles in a compact space – and in the existing Han® HPR housing. Technical details: - Rated current 250 A at a rated voltage of 2000 V - Termination cross-sections are: 35 mm2, 50 mm2 and 70 mm2 - Maximum four-pole interfaces in a size 24 B HPR housing, making it particularly suitable for motor connections - High quality plastic with good smoke and inflammability levels - Removal tool for simple installation and removal of the contacts and inserts - Confusion of a number of interfaces is reliably prevented by multiple coding options for the individual inserts The requirements in the railway industry are changing, as ...
Read more

EGCS-D0 Accelerometer Now Available in 10,000g Range

Measurement Specialties, Inc. (NASDAQ: MEAS) has recently redesigned the EGCS-D0 accelerometer to enable it to accurately and reliably measure up to ±10,000g. This rugged device is critically damped, which is the ideal mechanism to protect the accelerometer against ±20,000g impacts and prevent sensor ringing. The EGCS-D0 accelerometer is now available in ranges from ±5g to ±10,000g which makes it ideal for both critical low-g measurements and high-g impacts. These units feature a Wheatstone Bridge mV output with a standard compensated temperature range of 20ºC to 80ºC (other options available). The EGCS-D0 was specifically designed for impact and shock testing in auto safety, aerospace, military and civil engineering applications. Designed to be bolt-mounted, this device operates from 2-15Vdc excitation with electrical output ratiometric to voltage input. Optional triaxial mounting blocks (MTG-F4), signal conditioners (Model 101) and auto-zero inline amplifiers (Model 140) are avai...
Read more
Ilix Cermet Reamers Are Ideal For Dry Machining Engineers Cutting Tools, the UK agent for Ilix, has introduced Ilix solid-carbide and cermet reamers for the machining of hard metals. The machine reamers 6372C and 6323 allow the production of high-precision holes with good surface finish. Compared with HSS, the solid-carbide qualities enable the increase of cutting parameters and tool life. The quality of the reamers is said to guarantee high performance, even for hard metals with a resistance more than 1200N/mm2. The Ilix carbide 6372C range of hundredth reamers is from 0.98mm through to 12.05mm in increments of 0.01mm. The reamers are manufactured to a tolerance of +0.000 - +0.004mm. The cermet reamers 6323 have new cutting geometry developed by Ilix. These reamers are said to be ideal for steel machining, having high chemical stability during the cutting process. They offer good wear resistance due to the high hardness and have low material adhesion. The Ilix cermet reamer is said to...
Read more