Linear Technology’s new LTC3839 is a high-frequency, controlled on-time, single-output, dual phase synchronous step-down DC/DC controller that can achieve up to 95% efficiency with a 25 A output when operating at 2 MHz. The operating frequency is selectable from 200 kHz to 2 MHz or can be synchronised to an external clock.
A low 30 ns minimum on-time allows for a high step-down ratio at very high operating frequencies. The controlled on-time, valley current-mode architecture and ‘detect transient release’ feature provide a very fast transient response by increasing operating frequency during a transient event, enabling the output voltage to recover in only a few clock cycles. Up to 12 phases can be paralleled and clocked out of phase for high-current applications (up to 250 A).
The LTC3839 operates over a 4,5 V to 38 V input voltage range, encompassing a wide variety of applications including most intermediate bus voltages. Strong onboard N-channel MOSFET gate drivers allow the use of high-power external MOSFETs for output currents up to 50 A, at output voltages ranging from 0,6 V to 5,5 V, making the device well suited for point-of-load requirements.
The IC’s differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high-accuracy regulation independent of PCB IR losses (up to ±500 mV). The output current is monitored by sensing the voltage drop across the output inductor (DCR) for highest efficiency or by using a sense resistor for extra precision. Additional features include an onboard bias voltage LDO, soft-start or tracking, adjustable current limit, over-voltage protection, current limit foldback and external VCC control.
The LTC3839 offers high total regulation accuracy and is specified to account for all error sources including line, load and differential sensing. Total output voltage accuracy is ±0,25% at 25°C, ±0,67% from 0°C to 85°C, and ±1% maximum DC error over the full -40°C to 125°C operating junction temperature range.
Compact direct Time-of-Flight 3D LiDAR module Altron Arrow
Opto-Electronics Electronics Technology AI & ML
The VL53L9 from STMicroelectronics is the first direct Time-of-Flight (dToF) 3D LiDAR all-in-one module in ST’s portfolio, offering a resolution of 2,3K zones, wide field of view, on-chip processing, 100 frames per second, and sensing range from 5 centimeters to 9 meters.
Read more...Quality batteries are critical for IIoT Uniross Batteries
Power Electronics / Power Management
Batteries intended for use in industrial operations must indeed offer complete reliability under extreme environmental conditions, resistance to vibration and harsh environments.
Read more...12 kW hybrid inverter
Power Electronics / Power Management
Sungrow recently unveiled its next-generation residential energy storage solution, expanding its power range from 5 kW to 12 kW with the introduction of the new MG12RL hybrid inverter.
Read more...40 W and 75 W railway DC/DC converter Brabek
Power Electronics / Power Management
RECOM has announced two new cost-efficient DC/DC converters for the rail market with an ultra-wide 11:1 input range to cover all nominal input voltages from 24 to 110 V DC.
Read more...Power modules for solid-state transformers RS South Africa
Power Electronics / Power Management
Microchip’s new 3,3 kV silicon carbide modules deliver the required thermal performance and efficiency for SSTs to increase power available for token generation.
Read more...Solving South African power problems with locally built intelligence
Editor's Choice Power Electronics / Power Management
Smart metering infrastructure in South Africa remains patchy. The rollout has been slow, coverage is inconsistent, and for the most part, granular per-unit measurement simply does not exist.
Read more...Wide range power module
Power Electronics / Power Management
The latest DC-DC modules from Würth Elektronik are characterised by high resilience to voltage transients on the 24 V bus and an extremely wide input-voltage range from 3,5 V to 38 V.
Read more...Generating negative voltages from a positive supply Altron Arrow
Editor's Choice Passive Components
It is common for IoT devices, industrial sensors, meters, and medical equipment to require both a positive and negative voltage, and this article explains the options available to produce a negative rail from a positive rail supply.
Read more...Addressing latency and signal integrity challenges Altron Arrow
DSP, Micros & Memory
Strengthening Microchip Technology’s data centre solutions portfolio, its XpressConnect retimers support high-bandwidth architectures, while helping reduce integration complexity.
Read more...Precision timing in compact package Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Designed for use in harsh environments, the EX-423 incorporates a four-point mounted quartz crystal structure that improves shock resistance and reduces g-sensitivity.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version