Power Electronics

New products

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Low-Noise Op Amps Improve Signal Conditioning in Harsh Industrial Applications

MAXIM INTEGRATED Products introduces the MAX9632/MAX9633 36V, low-noise, precision operational amplifiers with low distortion. The first devices in Maxim's new line of high-voltage, precision op amps, the MAX9632/MAX9633 are designed using a proprietary high-speed complementary BiCMOS process (CB5HV). This high-voltage analog process is optimized for excellent AC dynamic performance, ultra-low noise, wide operating voltage range, and low-drift signal conditioning. The MAX9632/MAX9633 target industrial data acquisition applications that require precision signal conditioning at low frequencies. The MAX9632 is a single op amp with an ultra-low input-voltage noise density of 0.94nV/rt-Hz, a low offset of 125microvolts (max), and an offset temperature coefficient of 0.5microvolts/ degree Celsius (max). The MAX9633 is a dual op-amp with an input-voltage noise density of 3nV/rt-Hz, an offset of 200microvolts (max), and an offset temperature coefficient of 0.9microvolts/degree Celsius (max). Both devices provide high-fidelity signal conditioning with THD specifications better than -136dB, enabling use in professional audio equipment and high-end test and instrumentation applications. Gain-bandwidth product (GBWP) is typically 55MHz for the MA9632 and 27MHz for the MAX9633. This usable bandwidth, combined with a generous 4.5V to 36V operating voltage range and a typical current consumption of 3.9mA (MAX9632), allows the devices to be used in an array of high-performance industrial applications. Both devices offer a new level of robustness, with up to ±8kV Human Body Model ESD rating (MAX9632). The MAX9632/MAX9633 are fully specified for operation over the -40 °C to +125 °C automotive temperature range. The products are available in a small (3mm × 3mm), lead-free, 8-pin TDFN package and an 8-pin SO package (MAX9632 only). Prices start at $3.39 for the MAX9632 and $2.39 for the MAX9633 (1000-up, FOB USA).
Maxim Integrated Products
Sunnyvale, CA


Resettable Overcurrent Protection Device For Li-Ion Batteries Offers Size and Cost Benefits

TYCO ELECTRONICS announced the introduction of a Metal Hybrid PPTC (MHP) technology useful for high-rate-discharge battery applications at ratings above 30VDC/30A such as cordless power tools, e-bikes and back-up power supplies. MHP technology uses a new hybrid circuit protection approach that combines a bimetal protector in parallel with a polymeric positive temperature coefficient (PPTC) device. This integrated solution provides resettable overcurrent protection and utilizes the low resistance of the PPTC device to help prevent arcing in the bimetal protector at higher currents, while also heating the bimetal to keep it open and in a latched position.

Few protection solutions address high-rate-discharge battery applications and traditional circuit protection techniques tend to be large, complex and/or expensive. In response, MHP technology provides a cost-effective, space-saving device that conventional circuit protection approaches are unable to deliver. The initial product in a planned family of MHP devices, the MHP30-36 device has a 36VDC/100A maximum rating and a time-to-trip of under five seconds at 100A (at 25 degrees C). The device's hold current is 30A and the initial resistance is under 2 mΩ. The MHP30-36 device offers excellent arc suppression characteristics compared to standard breaker devices that must limit the number of switching cycles since arcing between contacts may damage them. The MHP30-36 device can also help reduce the number of discharge FETs and accompanying heat sinks in applications that typically use IC-plus-FET battery protection designs. The MHP device technology can be configured for various applications, and higher voltage (up to 400VDC) and hold current (60A) devices are currently in development. Future design considerations include battery protection in Li-ion battery packs used in e-scooters and light electric vehicles (LEVs), as well as standby-power applications and non-battery applications such as electric motor protection.
Tyco Electronics
Menlo Park, CA


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