ISL91128 – A New Buck-Boost Regulator With I2C Interface From Intersil

If your application requires a changing supply voltage, then this new IC is ideal for you. Intersil announced the ISL91128, a new buck-boost regulator. The new regulator has an I2C interface to select a broad set of features including output voltage range and slew rate. This eliminates the need of feedback resistors and allows the reuse of the same design for multiple output voltage needs.

The input voltage range is from 1.8V to 5.5V, and the output voltage range is from 1.9V to 5.5V with output current up to 2.2A. ISL91128 has 2.5MHz switching frequency. It is fully protected for short-circuit, over-temperature and undervoltage, according to the datasheet.

isl91128_applicationISL91128 is available in a small 2.15mm x 1.74mm WLCSP package.

intersil_bbIntersil provides ISL91128IIN-EVZ, an evaluation board for ISL91128. ISL91128 is part of ISL911xx family of buck-boost/boost regulators.

Key Differences in Family
Key Differences in Family

[Product Page]


Via: ElectronicsWeekly

ESPUSB – An USB Software Stack For ESP8266

ESP8266EX and even the new ESP32 SoC lack a USB hardware transceiver, so [CNLohr] decided to develop a USB software stack for ESP8266. After a quick search, I think it is the first try to do a USB software stack for esp8266. USB software stack is a firmware-only implementation of a USB. ESPUSB works in a similar way of V-USB for AVR MCUs.

This USB Stack uses D- on GPIO 4 and D+ on GPIO 5 and only operates with low-speed USB. To run ESPUSB on ESP8266 it will need about 317 byte of SRAM and 1422 byte from flash/IRAM.

USB Enumeration Using ESPUSB - Images courtesy of cnlohr
USB Enumeration Using ESPUSB – Images courtesy of cnlohr

[CNLohr] said that he could flash ESP8266 using the ESPUSB.

Flashing ESP8266 Using ESPUSB - Images courtesy of cnlohr
Flashing ESP8266 Using ESPUSB – Images courtesy of cnlohr

[CNLohr] described in a video the code of ESPUSB and how he developed it.

A forum for discussion for ESPUSB was created in ESP8266 website.
You can reach the source code of ESPUSB project on the GitHub repository.

Via: cnx-software

Power supply IC packs eight buck regulators


Aimed at systems requiring multiple low-voltage supplies, Linear Technology’s LTC3374A can be configured to supply two to eight independent regulated outputs with 15 possible output-current configurations. Each of the eight synchronous 1-A buck converters is powered from an independent 2.25-V to 5.5-V input supply. Output voltage range is 0.8 V to VIN. by @

The LTC3374A is well-suited for a variety of multichannel applications, including industrial, automotive, and communication systems. Along with a peak efficiency of 94%, the device provides one output with ±1% voltage accuracy and up to seven additional outputs with ±2% accuracy. Up to four adjacent buck regulators can be combined in parallel to provide up to 4 A of output current with a single shared inductor by connecting their VIN pins together, their SW pins together, and by connecting the slave bucks’ FB pins to the input supply.

Power supply IC packs eight buck regulators – [Link]

Rail-to-rail step-down regulator sinks/sources ±5A from 0V to 14.5VOUT


LTC3623 is a ±5A high efficiency, current mode synchronous buck regulator that is adjustable from 14.5V down to 0V output with a single resistor. Its architecture uses a 50 µA current reference, combined with a single resistor, to set the output voltage. by Graham Prophet @

The LTC3623’s 4V to 15V input voltage range is suitable for dual-cell Li-Ion applications, and fixed 5V and 12V intermediate bus systems. Low R DS(ON) integrated N-channel power MOSFETs (60mΩ top & 30 mΩ bottom) and synchronous rectification deliver efficiencies up to 96%. The device’s design allows dynamic adjustment of output voltage from 0V to V IN – 0.5V, offering virtually rail-to-rail performance.

Rail-to-rail step-down regulator sinks/sources ±5A from 0V to 14.5VOUT – [Link]

DIY Lorentz Force Experiment


Fabian Gebhart shared his Lorentz Force experiment on Thingiverse:

Don’t you love it? Magnetism? Electronics? And 3d printing? In this project I combine all of them together to a little but spectacular do-it-yourself experiment. With just a few components and the 3d printed part you will be able to build your own Lorentz Force Experiment.

DIY Lorentz Force Experiment – [Link]

ams AS1383 A 200mA, 3.5MHz DC-DC Boost Converter

If you have a single Li-Ion battery powered application, then you need to think about using AS1383 in your design.

AS1383 is a DC-DC boost converter comes in a 6-pin WL-CSP package with 0.4mm pitch, a very small package suits the limited space applications. In the below image, you can compare the WL-CSP package with the 0805 SMD capacitor to know how small it is.

AS1383 And 0805 Capacitors
AS1383 And 0805 Capacitors

AS1383 uses 3.5MHz switching frequency and this high frequency allows the usage of a low profile inductor with only 1μH.

The input voltage range is from 2.7V to 5.5V and The output voltage range is from 2.7V to 5.0V with 200mA output current. It has an enable input pin to reduce the supply current to < 1μA.

AS1383 is available in three options:

  • AS1383-BWLT-AD an adjustable Vout version.
  • AS1383-BWLT-45 a 4.5V fixed Vout.
  • AS1383-BWLT-50 a 5.0V fixed Vout.

The output voltage in the adjustable version can be selected with external resistor divider connected to the FB pin.

The AS1383 price is 0.25$ for 1K order. Also, an evaluation Kit for AS1383 is available for 49$.

I obtained the schematic and the BOM from the evaluation kit manual.

Evaluation Kit for AS1383
Evaluation Kit for AS1383


The Schematic of The Evaluation Kit for AS1383
The Schematic of The Evaluation Kit for AS1383


The BOM of The Evaluation Kit
The BOM of The Evaluation Kit

Data sheet

Product page

Via: Mouser

It’s the end of C as we know it!

04-TIOBE discuss about the future of C language and it’s use in embedded systems.

The C programming language has been with embedded software developers since its creation in 1972. Ever since then C has been a blazing constant, surviving even the big push in the late 90’s and early 21st century to move to C++ or other object oriented languages. Undoubtedly, C will continue to be a foundational language for embedded systems but over the last year, the language has begun to see a decrease in popularity.

It’s the end of C as we know it! – [Link]

Bi-Directional Voltage Level Translator


Lukas Fassler from Soldernerd shares his experience designing a bi-directional voltage level translator and manufacturing the board with DirtyPCBs.

While most of my microcontroller designs run on 3.3 volts there is still the occasional 5 volt design. Or I do something with an Arduino. So the need may arise to interface between logic working at different voltage levels. There are several ways of doing this, depending on your needs. Things are relatively simple as long as you know in advance which side is transmitting and which side is receiving. It gets more difficult if the communication is bi-directional or with buses such as I2C that are bi-directional by nature.

Bi-Directional Voltage Level Translator – [Link]

Cheap homemade 30 MHz – 6 GHz vector network analyzer


Henrik Forstén has done amazing job designing a homemade vector analyzer with the goal to fit it’s budget of 200EUR. The design is open source and available on github.

Vector network analyzer (VNA) are used to measure scattering parameters of high frequency circuits. When frequency is high enough the reflections of the waves start to matter and distributed effects need to be taken into account. VNA can be used to analyze reflection and transmission coefficients of circuits at high frequencies.

Cheap homemade 30 MHz – 6 GHz vector network analyzer – [Link]

Projecta: A Solution For PCB Printing


Projecta, the Affordable & Faster PCB Prototyping Machine is going to launch their kickstarter campaign soon. Check the draft kickstarter page and feel free to post your feedback.

Projecta is an affordable desktop CNC machine optimized for making circuit boards in new innovative way.

Projecta: A Solution For PCB Printing – [Link]