The LT8614 is a 4A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher architecture reduces EMI/EMC emissions by more than 20dB, well below the CISPR 25 Class 5 limit. Even with switching frequencies in excess of 2MHz, synchronous rectification delivers efficiency as high as 96% while Burst Mode operation keeps quiescent current under 2.5μA in no-load standby conditions. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications.
LT8614 – 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current - [Link]
The LTC2057 is a high voltage, low noise, zero-drift operational amplifier that offers precision DC performance over a wide supply range of 4.75V to 36V (or 4.75V to 60V for the LTC2057HV). Offset voltage and 1/f noise are suppressed, allowing this amplifier to achieve a maximum offset voltage of 4μV and a DC to 10Hz input noise voltage of 200nV peak to peak (typ). The LTC2057’s self-calibrating circuitry results in low offset voltage drift with temperature, 0.015μV/°C (max), and zero-drift over time. The amplifier also features an excellent power supply rejection ratio (PSRR) of 160dB and a common mode rejection ratio (CMRR) of 150dB (typ).
LTC2057 – 60V Zero-Drift Operational Amplifier with 220nVP-P Noise - [Link]
Linear Technology have announced the LTM4624 14V, 4A step-down µModule® (micromodule) regulator in a 6.25 x 6.25 x 5.01mm BGA package. Along with two (1206 package) ceramic capacitors and a (0603 or smaller package) resistor this complete regulator solution fits within 1cm² on a single-sided or 0.5cm² on a double-sided PCB. Like other µModule regulators in the range, the LTM4624 contains the DC/DC controller, power switches, inductor and compensation on-board. It is designed to operate from a 4V to 14V input supply, delivering a regulated output adjustable between 0.6V to 5.5V which according to Linear Technology make it ideal for applications in communications, storage, industrial, and medical systems. [via]
4A Step Down µModule in less than 1cm² - [Link]
Steve Taranovich writes:
Linear Technology Corporation announced the LT8705, a very high efficiency (up to 98%) synchronous buck-boost DC/DC controller that operates from input voltages above, below or equal to the regulated output voltage. This device has four feedback loops to regulate the input current/voltage, along with the output current/voltage.
Convert any input voltage from 2.8V to 80V into a fixed output voltage or output current - [Link]
The LTM4641 is a 4.5V to 38V input, 0.6V to 6V output, 10A step-down μModule regulator with comprehensive input and load protection features. The part monitors input voltage, output voltage and temperature conditions. If any user-adjustable trip thresholds are exceeded, the LTM4641 responds quickly (within 500ns in the case of an output overvoltage fault), ceasing operation and if necessary activating external switches to protect both input source and load. As a μModule regulator, the LTM4641 includes power MOSFETs, DC/DC controller, inductor, compensation and the protection logic circuits in a compact surface mount BGA package.
- Wide Operating Input Voltage Range: 4.5V to 38V
- 10A DC Typical, 12A Peak Output Current
- Output Range: 0.6V to 6V
- ±1.5% Maximum Total Output DC Voltage Error
- Differential Remote Sense Amplifier for POL Regulation
- Internal Temperature, Analog Indicator Output
LTM4641 – 38V, 10A DC/DC µModule Regulator with Advanced Input and Load Protection - [Link]
Here is a PDF document from Linear Technology, featuring current sense circuits for different applications, including High side, low side, level shifting, high and low voltage, fault sensing, etc: [via]
Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the techniques to do so are as diverse as the applications them-selves. This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents.
Current sense circuit collection - [Link]
The LTC®4000-1 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers with maximum power point control. In contrast to the LTC4000, the LTC4000-1 has an input voltage regulation loop instead of the input current regulation loop.
Features of the LTC4000-1’s battery charger include: accurate (±0.25%) programmable float voltage, selectable timer or current termination, temperature qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells, bad battery detection and status indicator outputs. The battery charger also includes precision current sensing that allows lower sense voltages for high current applications.
LTC4000-1 – High Voltage/Current Controller for Battery Charging with Maximum Power Point Control - [Link]
Light, sound, temperature: the world is a symphony of vibrations. All around us is a world alive with continuously varying signals. These real world sensations are called analog signals to distinguish them from digital signals–which can only switch between 0 and 1 (on and off) and which exist only in a computer. Many systems have both analog and digital elements: a smartphone, for example, has both analog and digital parts and converts signals back and forth between the two continuously. Over half of the iPhone 4 is composed of analog circuits or systems.
Capturing these real-world signals and making them do amazing things is the domain of the analog circuit designer. Jim Williams, who was considered one of the best analog circuit designers in the world, suffered a stroke and passed away on June 12, 2011. Linear Technology, the company Jim worked for, has loaned the Computer History Museum Jim’s unique workbench so that visitors can learn about Jim and the fascinating world of analog circuit design.
An Analog Life: Remembering Jim Williams - [Link]
Designers of high availability systems frequently engineer redundancy into their power systems by paralleling two similar supplies with diodes (diode-OR) such that one can handle the load when the other fails. System reliability is further increased if both supplies operate simultaneously, each sharing half the load current. The LTC4370 is a first-of-its-kind current-sharing controller with reverse current blocking. The LTC4370 frees the designer from the limitations and complications of existing current-sharing methods to obtain a simpler, quicker, and space-saving solution for sharing between two supplies.
- Shares Load Between Two Supplies
- Eliminates Need for Active Control of Input Supplies
- No Share Bus Required
- Blocks Reverse Current
- No Shoot-Through Current During Start-Up or Faults
LTC4370 – Two-Supply Diode-OR Current Balancing Controller - [Link]
I’ve been doing a lot of power supply testing lately, using both switching a linear supplies. Since it’s not something I’ve had to do often in the past (I’m an apps person, not so much a test engineer) … I thought it was worthwhile to spend a bit of time digging around for app notes on accurately characterising linear and switching supplies.
AN 372-1 Power Supply Testing - [Link]