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Power Management I Product News

Versatile buck-boost battery manager offers multi-chemistry operation & PowerPath control

Linear Technology has introduced the LTC4020, an advanced high voltage power manager and multi-chemistry battery charger designed to efficiently transfer power from a variety of sources to a system power supply rail and a battery.

The device offers precision charge current

regulation, ±0.5% charge voltage regulation and operates across a wide 4.5V to 55V input voltage range compatible with a variety of different input voltage sources. With an output voltage range up to 55V and

three selectable termination algorithms, the LTC4020 accommodates a wide variety of battery stack voltages and chemistries. The device contains a step-up/step-down DC/DC controller, enabling operation with battery voltages that are above, below or equal to the input voltage (VIN). Typical applications include portable industrial and medical equipment, solar- powered systems, military communications equipment, plus 12V to 24V embedded automotive systems. The LTC4020 features an intelligent PowerPath topology that reduces the voltage range required by downstream system components to that of the expected battery voltage range rather than the full extent of the input voltage source. However, instant-on operation still ensures system load power with a fully discharged battery. Furthermore, this topology preferentially provides power to the system load when input power is limited - the device’s ideal diode controller guarantees that ample power is always available to VOUT if there is insufficient power available from the DC/DC converter.

A maximum power point control (MPPC)

circuit features an input voltage regulation loop, which controls charge current to hold the input voltage at a programmed level, ideal for high impedance input or solar panel-powered applications. When no input supply is present, the battery drain current is reduced to only 10µA, maintaining maximum stored capacity. The LTC4020’s three pin-selectable charging

profiles have been optimised for a variety of battery chemistries. It can provide a constant- current/constant-voltage (CC/CV) charge characteristic with either C/10 or timed termination for use with lithium-based battery systems including Li-Ion, Li-polymer and LiFePO4. A constant-current (CC) characteristic with timed termination can be used for charging supercapacitors or trickle charging nickel-based batteries. Finally, a 4-step, 3-stage lead-acid charge profile works well with all types of lead-acid batteries including sealed, AGM and flooded. An integrated timer controls termination during CC/CV charging, as well as additional protection during battery preconditioning and absorption charging for lead-acid batteries. Two digital open-drain outputs provide charger status and signal fault conditions. These binary coded pins signal battery charging, standby or shutdown modes, battery temperature faults and bad battery faults.

Other features of the battery charger include: temperature-qualified charging using an NTC thermistor, automatic recharge and precondition low current charging for deeply discharged cells. The LTC4020 is housed in a low profile (0.75mm) 38-pin 5mm x 7mm QFN package with a backside metal pad for excellent thermal performance. The device is guaranteed for operation from -40°C to 125°C.

Linear Technology |

IR expands µIPM family with half-bridge power modules

International Rectifier has expanded its family of highly integrated, ultra-compact, patent pending µIPM power modules with the introduction of the IRSM808-105MH and IRSM807-105MH, both of which have been optimised for high efficiency appliance and light industrial applications with motor power up to 300W. Available in an ultra-compact 8x9x0.9mm PQFN package, the half-bridge power modules offer up to a 60 percent smaller footprint than existing 3-phase motor control power ICs to provide a compact heatsink-free solution for applications including compressor drives for refrigeration, pumps for heating and water circulation, air-conditioning fans, dishwashers, and automation systems.

“These µIPM power modules will provide designers with even greater scalability, in addition to offering up to a 60 percent smaller footprint compared to existing leading solutions and delivering advantages in output current capability and system efficiency cost-effectively,” said Alberto Guerra, Vice President, Strategic Market Development, IR’s Energy Saving Products Business Unit. IR’s patent pending µIPM product family offers a scalable power solution with common pin-out and package size. Featuring rugged and efficient high-voltage FredFET MOSFET switches which have been optimised for variable frequency drives and IR’s most advanced high-voltage driver ICs,

26 December 2013/January 2014

COOLiRFET family offers efficiency for high performance automotive applications

RS Components (RS) is stocking a new family of automotive-qualified COOLiRFET MOSFETs from International Rectifier (IR). The devices deliver on- state resistance (Rds(on)) for heavy load applications including electric power steering (EPS), braking systems and other heavy loads on internal combustion engine (ICE) and micro hybrid vehicle platforms.

Qualified to AEC-Q101, the 22 new 40V N- channel MOSFETs feature IR's Gen12.7 trench technology delivering ultra-low Rds(on) in D2Pak- 7P, D2Pak, DPak, TO-262, IPAK and TO-220 packages. The benchmark D2Pak-7P AUIRFS8409-7P delivers Rds(on) max as low as 0.75mOhm at 10Vgs with a current rating up to 240A. The new devices also offer low conduction losses and robust avalanche performance to deliver higher efficiency, power density and reliability.

These automotive MOSFETs are subject to dynamic and static part average testing combined with 100 percent automated wafer level visual inspection as part of IR's automotive

quality initiative targeting zero defects. The new devices are AEC-Q101 qualified, which requires that there is no more than a 20 percent change in Rds(on) after 1,000 temperature cycles of testing, and feature an environmentally friendly, lead-free and RoHS compliant bill of materials.

RS Components |

Ultra-compact 50 W DC-DC converter cuts both board space and cost

CUI Inc has unveiled what it claims is one of the smallest 50 W DC-DC converters on the market, the PQA50-D. The series’ feature set makes it suitable for IT equipment, telecom and industrial systems. It is a low cost, high performance family with a 2 x 1 inch (50.8 x 25.4 mm) footprint – an industry standard size for less powerful devices. The device also incorporates a six sided metal shielding for improved EMC performance and efficiency up to 93%. The converters maintain high

efficiency figures across the entire input voltage range - including under light loads, making the PQA50-D series suitable for designs where minimising power consumption at various operating conditions is a priority. The modules feature a 2:1 input range and

are available with an 18~36 Vdc or 36~75 Vdc input voltage range and 3.3, 5, 12, 15 or 24 Vdc output voltages.

The series has 1500 Vdc input-to-output isolation and protections for output over voltage,

short circuit, over load, and input under voltage. It also offers precise voltage regulation, featuring load regulation of +/- 1% max. from 10% to 100% load and line regulation of +/- 0.5% max. Additional features of the new PQA50-D series include an operating temperature range of -40~85 °C, remote on/off control, and voltage adjustability of +/- 10%.


New sensorless brushless DC motor control solution speeds applications development

Silicon Labs has introduced a brushless dc (BLDC) motor control reference design that features ready-to-use hardware and software for sensorless BLDC applications using Silicon Labs’ C8051F85x/6x microcontrollers (MCUs). The new reference design provides a comprehensive, system-level solution that accelerates embedded development for a wide range of motor control applications.

The C8051F85x/6x MCU-based motor control

the µIPM product family offers DC current ratings ranging from 2A to 10A and voltages of 250V and 500V.

This is a new approach pioneered by IR and used PCB copper traces to dissipate heat from the module, providing cost savings through a smaller package design and eliminating the need for an external heat sink. By using standard packaging QFN technology, assembly is simplified by eliminating through-hole second pass assembly and improving thermal performance compared to traditional dual-in-line module solutions.

International Rectifier | Components in Electronics

reference design looks to make the work of engineers easier by providing them with cost- effective hardware and production-quality firmware for quick evaluation and deployment in cost-sensitive BLDC applications. In addition, the motor control graphical user interface (GUI) gives developers greater flexibility and ease-of-use when controlling and understanding BLDC motor operation.

The sensorless BLDC motor control reference design uses a C8051F850 MCU to control a BLDC outrunner motor (typically found in toy helicopters) mounted on the motor mount board. The powertrain board contains gate drivers, power MOSFETs, a current sensing resistor as well as resistor dividers to attenuate motor phase voltages so that they can be measured by the C8051F85x/6x MCU. The MCU

board contains a C8051F85x/6x MCU, as well as buttons to start/stop and change motor direction and reset the MCU. The MCU’s PWM output drives the gate drivers on the powertrain board. The MCU board also contains an operational amplifier (op-amp) to amplify the current sensing voltage so it can be measured by the MCU. Silicon Labs’ sensorless BLDC reference design is designed to give developers a productive, comprehensive “out-of-box” experience and the reference design includes both hardware and software tools.

Silicon Labs |

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