IC category

LTC7820 – Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

The LTC7820 is a fixed ratio high voltage high power switched capacitor/charge pump controller. The device includes four N-channel MOSFET gate drivers to drive external power MOSFETs in voltage divider, doubler or inverter configurations. The device achieves a 2:1 stepdown ratio from an input voltage as high as 72V, a 1:2 step-up ratio from an input voltage as high as 36V, or a 1:1 inverting ratio from an input voltage up to 36V. Each power MOSFET is switched with 50% duty cycle at a constant pre-programmed switching frequency. System efficiency can be optimized to over 99%. The LTC7820 provides a small and cost effective solution for high power, non-isolated intermediate bus applications with fault protection.

LTC7820 – Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller – [Link]

CP2615 USB-I2S Bridge – A New Solution from Silicon Labs

Apple said goodby to 3.5mm audio jack in Iphone 7 by adding the audio signal to USB plug besides the other functionalities. While Iphone is a pioneer brand, a lot of manufacturers in the near future will drop that analog jack. However, your ear responds to analog signals only. So either you buy headphones with built-in USB audio to analog converter, or you use your old headphones with an adapter. This “new” demand for converting between USB and analog increases the need for ready made solutions.

IPhone 6 and iPhone 7 ports comparison — By Rafael Fernandez (Own work) CC BY-SA 4.0 , via Wikimedia Commons

Silicon Labs has a lot of solutions for USB fixed-function chips. A new IC from Silicon Labs called CP2615 serves as a digital audio bridge transferring digital audio data between the USB and integrated I2S serial bus interfaces with no firmware development needed.
CP2615 is available in 5mm x 5mm QFN-32 package and includes a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, I2S audio interface, integrated I2C to communicate with DACs/codecs and embedded flash memory for storing device configurations.

CP2615 has a number of properties that need to be configured like Audio Sample Rates, selecting audio interfaces and others. They can all be configured using “Xpress Configurator” available in Silicon Lab’s IDE (Simplicity Studio).

CP2615 Datasheet
Source: Electropages

Reverse engineering the 76477 sound effect chip

Ken Shirriff has written an article on reverse engineering the 76477 “Space Invaders” sound effect chip:

Remember the old video game Space Invaders? Some of its sound effects were provided by a chip called the 76477 Complex Sound Generation chip. While the sound effects1 produced by this 1978 chip seem primitive today, it was used in many video games, pinball games. But what’s inside this chip and how does it work internally? By reverse-engineering the chip from die photos, we can find out. (Photos courtesy of Sean Riddle.) In this article, I explain how the analog circuits of this chip works and show how the hundreds of transistors on the silicon die form the circuits of this complex chip.

Reverse engineering the 76477 sound effect chip – [Link]

Motor driver fits small IoT devices

Susan Nordyk @ edn.com:

A single-chip 2.6 A driver for brushed DC motors, STMicroelectronics’ STSPIN250 targets battery-powered portable and wearable applications. This low-voltage, energy-efficient driver integrates a power MOSFET bridge and fixed off-time PWM current controller in a tiny 3×3 mm VFQFPN package.

Motor driver fits small IoT devices – [Link]

Fuel gauge needs no battery characterization

by Susan Nordyk @ edn.com

The MAX17055 single-cell fuel gauge from Maxim not only eliminates battery characterization, but also keeps SOC (state-of-charge) error to within 1% in most scenarios. With its ModelGauge m5 EZ algorithm, the device provides tolerance against battery diversity for most lithium batteries and applications. It also allows system designer’s to decide when to shut down the device when the battery gets low, maximizing device runtime.

As the battery approaches the critical region near empty, the ModelGauge m5 algorithm invokes a special error correction mechanism that eliminates any error. In addition, it provides three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

Fuel gauge needs no battery characterization – [Link]

LT8641 – 65V, 3.5A Synchronous Step-Down Silent Switcher

The LT8641 is a monolithic, constant frequency, current mode synchronous (external schottky diode is not necessary) step-down switching regulator. Its 3V to 65V input voltage range makes it ideal for 12V or 24V automotive and industrial applications. It delivers up to 3.5A of continuous output current and peak loads of 5A. Output voltages can be set in 0.81 to 64V range. [via]

LT8641 – 65V, 3.5A Synchronous Step-Down Silent Switcher – [Link]

Teardown of a TDA7375 audio amplifier IC

A teardown of a TDA7375 audio amplifier IC from Electronupdate:

The TDA7375 audio power amplifier.
Another example of a long-lived integrated circuit.  1st introduced in 1998… looks like it’s still being made.

Teardown of a TDA7375 audio amplifier IC – [Link]

Sensirion solves long-standing stability problem in metal-oxide gas sensors

At this year’s Sensor+Test 2017 in Nuremberg (May 30 – June 1), Sensirion AG, the expert in environmental and flow sensor solutions, introduces the SGP – a siloxane resistant metal-oxide gas sensor with unprecedented long-term stability.

The SGP gas sensor is based on Sensirion’s multi-pixel platform, which integrates four gas sensing elements into a very small 2.45 x 2.45 x 0.9 mm3 DFN package featuring a fully calibrated air quality output signal. The unique combination of long-term stability and multi-pixel technology opens up new possibilities for environmental monitoring in smart home, appliances and Internet of Things applications. Thanks to its unique performance, the SGP allows the integration of metal-oxide gas sensors into mobile devices.

Sensirion solves long-standing stability problem in metal-oxide gas sensors – [Link]

2.5V to 36V, 2.5MHz, PWM Boost Controller with 4μA Shutdown Current

by Graham Prophet @ eedesignnewseurope.com:

Maxim Integrated has posted details of the MAX17290/MAX17292 high-efficiency, synchronous step-up DC-DC controllers, that operate over a 4.5V to 36V input voltage range with 42V input transient protection and feature reduced EMI. The input operating range can be extended to as low as 2.5V in bootstrapped mode.

2.5V to 36V, 2.5MHz, PWM Boost Controller with 4μA Shutdown Current – [Link]

LT8315 – 560VIN Micropower No-Opto Isolated Flyback Converter

The LT8315 is a high voltage monolithic flyback regulator that simplifies the design of an isolated DC/DC converter. By sampling the reflected isolated output voltage across the third winding on the power transformer, the part requires no opto-isolator or LT1431 for regulation. The LT8315 operates over an 18V to 560V input voltage range, has a 0.30A/630V integrated power switch and delivers up to 15 watts of output power, ideal for electric vehicles and battery stacks, as well as off line, automotive, industrial and medical applications.

LT8315 – 560VIN Micropower No-Opto Isolated Flyback Converter – [Link]