Applications supporting plug-and-play connections require (accurate) current limitation and over-current protection, preferably implemented in a low-cost solid-state IC. For a division of a large semiconductor company the accurate current control was a design challenge that was tackled by involving SystematIC in the circuit design. The area, cost-of-silicon and on-resistance of the integrated power switch are relevant parameters for the technology choice, but in any case dictate preference for an NMOS power switch. Using an NMOS switch however complicates the design of driver and sensing circuits. After IC definition and process selection SystematIC was involved to do the challenging circuit design of the product.
SystematIC did the challenging full-chip circuit design, including current sensing circuits using low-offset chopped amplifiers, adjustable over-current current control, over-temperature protection, and push-pull chargepumps to drive the area-optimized NMOS switch, and several other features. SystematIC also guided layout activities and supported evaluation of the silicon with measurement assistance and verification of the specifications. This included investigation and adjustment of the behavior over temperature and support for characterization in the final test.
From feasibility to final test support we were involved in a timespan of approximately 18 months.
WE ARE PROUD
We conquered the circuit design challenge for full-range current sensing and limiting, and verified robust operation over a range of environmental condition such as temperature, supply and output voltage, with minimum impact on on-resistance and chip area. We are proud having supported IC design and evaluation up to final testing, and that the product had several derivitives in different current ranges (up to 3A), including our involvement in the Lightning™ interface switch development.
BENEFITS FOR CUSTOMER
Our customer’s product line of switches was extended with a robust and feature-rich current-limited power switch. The development also was followed-up with several derivative products.
KEY TECHNICAL STATISTICS
- Input voltage 2.5 V to 6 V
- Total pin-to-pin on resistance < 100 mOhm
- Adjustable current limit, Max. 1.7 A (3 A in derivatives)
- Low off-current (1 uA), low-bias current (10 uA)
- Fast and accurate current limiting
- Internal charge pump driver
- Short-circuit protection
- Reverse-voltage protection
- Fault output with deglitch filters
- Under-voltage and Over-temperature protection
OUR OTHER SUCCESS STORIES
Successful achievement of your company’s goals will require IC solutions that are tailor made for your business needs. SystematIC was founded to help businesses imagine, plan, and develop these IC solutions.
INTEGRATED MAGNETIC SENSOR
Our customers is the Isolation Products Division of a semiconductor leader, who has a strong portfolio based on optical isolation techniques. Application of this fully integrated single chip magnetic sensor opened a new line of magnetic isolation products. Based on our reference high speed magnetic design in 2 months’ time a 180nm CMOS prototype was shipped.
PROXIMITY AND AMBIENT LIGHT DETECTION
SystematIC has designed a family of products which combines Ambient Light Sensor (ALS) and Infra-red Proximity Detection Sensor (PS) in a single SoC. The ambient light sensor matches the response of the human eye. The infra red proximity sensor measures the distance to an object. Our client is a leading global organization providing components to mobile phone manufacturing companies.
We were handed the responsibility of a current sensor IC that monitors charge and discharge currents of a battery in a mobile phone and will remain insensitive to the variations of the supply voltage. We took charge of the entire design trajectory along with evaluation and redesign that was needed to make the final product a notch better than competition.
TIRE PRESSURE MONITOR
In this project we developed an analog front-end architecture for a given capacitive MEMS pressure sensor. The front end must accurately measure the pressure in a tire and be robust against leakage, parasitics and noise. The SystematIC methodology was applied. First off, the sensor was electronically modelled to determine an optimal excitation and read out architecture. Next, during the detailed design phase the front-end was designed and layouted for a modern automotive IC application, including safety and test features.
X-RAY DETECTOR READOUT
The customer has a leading international position in industrial X-ray crystallography systems. In one of these products a multi-channel HV passive X-ray sensor is applied for material analysis and an accurate matched channel readout and signal processing ASIC is required. SystematIC proposed an architecture of ultra-low noise front ends that are noise optimized to the sensor element and applied in a matched channel configuration. The digital electronics where designed as special CMOS CML logic to obtain low crosstalk.
AC LED DRIVER IC
Our customer produces a range of AC LED modules for lamp manufacturers. The products were originally built with discrete components, a different set for each module type. For performance enhancement and simplification of production steps and supply chain, the customer was looking for a custom ASIC solution. The customer was also expecting improved performance on TRIAC dimmer compatibility and a reduction in product costs. With a programmable high-voltage ASIC and only a few external components (rectifier, fuse and surge) all module types can be made. LED modules with such an ASIC are directly driven from the AC mains voltage, are low-cost and are very compact and reliable. An electronic solution was created that made the customer AC LED lamp compatible with TRIAC dimmers. A discrete prototype was built and demonstrated to the customer just a few weeks after the first contact. The discrete electronics where chosen such that they could be implemented in a HV IC process.
POINT-OF-LOAD POWER CONTROLLER
Our customer, a fabless semiconductor company, started a new product line of drivers and controllers for power converter applications in industrial applications. SystematIC took care of the design of a complex power controller IC targeting application in Point-of-Load Power Modules, used in Ethernet Routers and Switches and other Industrial Applications. The customer’s approach was to offer a very versatile IC to the market that also realized excellent performance parameters (efficiency, ripple, etc). The customer discovered a strong market interest and had marketing & sales and application support in place but lacked the IC design resources for a quick product development. Within a year SystematIC developed all accurate analog functions in a new IC process and delivered the verified mixed-signal chip design and layout.
INTEGRATED POWER SWITCH
Applications supporting plug-and-play connections require (accurate) over-current protections, preferably implemented in a low-cost solid-state IC. For a division of a large semiconductor company the accurate current control was a design challenge that was tackled by involving SystematIC in the design. The area, cost-of-silicon and on-resistance of the integrated power switch are relevant parameters for the technology choice, but in any case dictate preference for an NMOS power switch. Using an NMOS switch however complicates the design of driver and sensing circuits. SystematIC did the challenging full-chip circuit design, including current sensing circuits using low-offset chopped amplifiers, adjustable over-current current control, over-temperature protection, and push-pull chargepumps to drive the NMOS.
EAR PROTECTION CONTROL IC
Our customer DEC develops and produces Dynamic Sound technology products which can typically be used as stand-alone hearing protection or embedded in headphone systems, hearing aids and hearables. The IC we designed for DEC was an example of an integration project for SME and it covers most aspects of a SystematIC turnkey solution. Our contribution extends from system study to implementation, manufacturability and testability for ears, from zeroing in the IC process to IC design and layout and the production preparation.
State-of-the-art electric propulsion (EP) systems used in satellites may exhibit impressive performance, but the used technologies cannot be scaled down in size and power whilst retaining system performance. As a result, no conventional technologies for propulsion are available for the upcoming micro- and nanosatellite market. SystematIC partners in the HiperLoc-EP project which aims to use a novel electric propulsion approach and develop an Electrospray Colloid Electric Propulsion System (ECEPS) suitable for small (cubesat) form factors.