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14 Jun 2012

This dual power supply regulator board provides constant 3.3V and 5.0V outputs from an unregulated DC input (6.5-10V). It is small in size and can be easily enclosed inside the project box along with a project circuit board. It can also be used to power test circuits on breadboard. The board uses two AMS1117 series fixed voltage regulators and receives input power through a DC wall wart or an external 9V battery.

Dual power supply (5.0V and 3.3V) regulator board – [Link]

1 Jun 2012

TPS7A7100 LDO Regulator

The TPS7A7100/200/300 low-dropout (LDO) voltage regulators are designed for applications seeking very low dropout capability (typically less than 100mV at 1-A load) with an input voltage from 1.5V to 6.5V. The TPS7A7100 offers an innovative, user-configurable output-voltage setting from 0.9V to 3.5V. The output is pin-programmable, which eliminates accuracy error due to the tolerance of feedback resistors used in traditional adjustable regulator designs.

Very Low Input – Programmable Output (0.9V to 5.0V) Low-Dropout Linear Regulators - [Link]

30 May 2012

Steven Keeping writes:

Switching DC/DC converters (“regulators”) have become popular because they are highly efficient and able to step-up (boost), step-down (buck), and invert voltages with ease. However, voltage and current ripples generated by high frequency operation can cause operational problems with sensitive chips and electromagnetic interference (EMI) hassles.

One answer is to spend a lot of time and resources ‘tuning’ the PCB design to minimize parasitic inductances and capacitances, and design time consuming filter circuits to minimize voltage and current ripples. Another is to enlist the venerable linear regulator to work in tandem with the switching converter to smooth the output of the latter and provide a stable, reliable voltage output.

This latter technique requires careful design and considered component selection to get the two regulators working in harmony and eliminate those post-regulation filters. This article describes the benefits of a “hybrid” voltage regulator approach, recommends component selection criteria, and describes a low-noise analog power supply example from Texas Instruments.

Hybrid Power Supplies Deliver Noise-Free Voltages for Sensitive Circuitry - [Link]

15 Apr 2012

The TPS65135 is a high-efficient, single-inductor, dual-output converter. Due to its single-inductor multiple-output (SIMO) technology, the converter uses a minimum of external components. The device operates with a buck-boost topology and generates a positive and a negative output voltage above or below the input voltage rail. The SIMO technology enables excellent line and load regulation required to avoid disturbance of a mobile phone display as a result of input voltage variations that occur during transmit periods. The device can also be used as a standard ±supply as long as the output current mismatch between the rails is smaller than 50 percent.

TPS65135 – Single-Inductor, Multiple-Output (SIMO) Regulator – [Link]

21 Feb 2012

PowerXR Programmable Power Solutions

A range of serial (I2C) programmable step-down regulators for complex systems with multiple supply voltages.

  • 3 or 4 completely independent PWM channels.
  • One 3.3/5 V selectable linear LDO regulator.
  • Programmable output voltage from 0.9 to 5.1 V.
  • Programmable switch frequencies from 0.3 to 1.5 MHz.
  • Up to 6 configurable GPIO pins.
  • PowerArchitect™ » Free development software.

PowerXR – Programmable switching regulator - [Link]

3 Dec 2011

Linear Technology Corporation introduces the latest device in its family of DC/DC uModule™ regulator systems that can regulate an output voltage from a variable input voltage greater than, less than or equal to the output voltage.

The LTM4607 is designed for higher voltage systems and operates from 4.5VIN to 36VIN, regulates an output voltage from 0.8V to 24V, and delivers output power up to 190W. The LTM4607 integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and all compensation circuitry in a 15mm x 15mm x 2.8mm land grid array (LGA) plastic molded package. Only an inductor, feedback and sense resistors, and bulk capacitors are required to implement a very low profile, compact and high efficiency design. The LTM4607 provides a compact regulator solution for applications such as networking, industrial, automotive systems and high power battery-operated devices.
The LTM4607 is offered for operation from -40°C to 85°C temperature range.

97% Efficient, Buck-Boost DC/DC uModule Regulator - [Link]

2 Nov 2011

The TL431 is a three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors.


  • Operation from -40°C to 125°C
  • Reference voltage tolerance at 25°C
  • 1%: A grade
  • 2%: standard grade
  • Low output noise
  • 0.2-Ω typical output impedance
  • Sink-current capability: 1 mA to 100 mA
  • Adjustable output voltage: Vref to 36 V

TL431: Cost-effective shunt regulator solution - [Link]

23 Sep 2011

System-level hardware designers pay careful attention to selecting the right analog signal path ICs for their specific applications. Each IC needs “clean” power but often, power management is the last part of a system design. As many designers know, power supply design affects the analog signal integrity which, ultimately, impacts overall system performance.

National Semiconductor’s broad portfolio of low-noise, low dropout (LDO) regulators preserve signal fidelity in the analog signal path over a wide range of input voltages and output currents. National’s portfolio of low-noise LDOs provide maximum Power Supply Rejection Ratio (PSRR) and low output voltage noise for low-power, space-constrained applications. In contrast to switching regulators which induce a voltage ripple and other high frequency voltage spikes in their output, an LDO’s PSRR filters out unwanted noise.

Low Dropout Regulators Deliver Quiet Power for Noise-Sensitive Circuits - [Link]

13 Sep 2011

An unconventional, scalable high efficiency 12V solar power system, a battery charge controller with low voltage cutout to protect the battery. www.opend.co.za writes:

Low idling current
This circuit was designed for small to medium lead acid systems and feature a lowish idle current ( 5mA ) which increases battery life on small capacity systems.

Easily obtainable parts
All the parts in this design are through hole parts and can be found from a number of sources. None of the parts need programing and only a voltmeter and an adjustable supply is needed to calibrate the board. This makes it easy and cheap to build and maintain.

Late generation
This is the 3rd iteration of the design, with improvements and bug fixes at every step.

A Novel high efficiency scalable solar regulator - [Link]

12 Aug 2011

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

LM5117 / LM25117 — Powerwise Wide Input Range Synchronous Buck Controller with Analog Current Monitor - [Link]





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