Stepdown DC-DC Controller
Linear Technology's LT3742 is a 100% duty-cycle dual-output stepdown switching regulator dc-dc controller that produces output voltages up to 30 V. The controller can also be configured with one side as a stepdown voltage regulator and the other as a supercapacitor charger (current source) for capacitor values up to several farads, a useful feature in robotic applications when longer holdup times are needed or where high peak currents are required.
The LT3742's 100% duty cycle allows the output voltage to be very close to the input voltage, ideal for battery-powered systems. The 4-V to 30-V input-voltage range enables operation from several intermediate bus voltages. A simple stepup dc-dc converter is incorporated to generate its own gate-drive voltage and also eliminates the extra parts required to drive the high-side MOSFETs. The LT3742 is offered in a 4-mm × 4-mm QFN-24 package. Pricing starts at $2.30 each in quantities of 1000.
Semtech's SC198 and SC198A are dual-output synchronous dc-dc buck converters, each with eight VID programmable output-voltage settings that allow portable systems manufacturers to easily lower processor voltages and extend the battery life of their devices.
The SC198 and SC198A provide options for powering core ICs in fixed 5-V, single Li-ion cell portable systems or three-cell NiMH/NiCd systems. The converters operate with an input-voltage range of 2.7 V to 5.5 V. The output voltage for the devices can be digitally programmed by control pins to eight different output pairs, ranging from 1 V to 3.3 V. Available in thermally enhanced 4-mm × 4-mm MLPQ-20 packages, the SC198 and SC198A are priced at $0.98 each in 1000-piece quantities.
The SiP21301 LDO controller from Vishay Intertechnology offers adjustable and fixed-output-voltage options that use external n-channel MOSFETs to provide dropout voltages under 50 mV at currents up to 7 A with 80%efficiency.
Because it works with an external n-channel MOSFET with a separate supply voltage, the SiP21301 allows designers to choose the FET with the on-resistance, dropout voltage, output current and power-dissipation ratings that best suit their applications, operating from 2.5 V down to 0.65 V at up to 7 A. Available in the compact, lead-free MSOP8 package, the SiP21301 is priced at $0.34 each in quantities of 1000.
ITT Interconnect Solutions has extended the current rating of its Cm5 Series servo-motor connector. Capable of handling current up to 40 A in a low-profile design, the connector is ideal for small servomotor applications requiring high current and where space is at a premium.
The Cm5 Series connectors feature crimp contacts, superior vibration resistance, and are completely shielded and sealed, including two sealed entries for power and signal cables. The connector meets IP67 approvals. The Cm5 connectors use a 4-way (3 phase, 1 ground) power connector and a signal connector providing several configuration options: 4-way sensor and brake, or 18- or 24-way signal.
Typical pricing for the Cm5 servo-motor connectors ranges from $50 to $75 each in quantities of 500 to 5000 pieces.
ITT Interconnect Solutions
Santa Ana, Calif.
Flyback Converter Controller
The L6566 controller from STMicroelectronics is designed for high-performance flyback powerconverters, which can operate in either the fixed-frequency or quasi-resonant mode, selectable by connection of a single pin. In addition, the chip integrates many protection capabilities commonly implemented with external components,and energy-saving features.
The IC is available in two versions, L6566A and L6566B. Version Ais designed specifically for converters supplied through a front-end powerfactor correction (PFC) circuit, while version B is intended for applications where a front-end PFC is not used. Available in an SO-16 package, the L6566 is priced at $0.50each in quantities of 2500.
Power-One's Z-One digital point-of-load converters (POLs) are additions to the company's ZY2000 no-bus and ZY8000 bus-programmable series. The new Z-One POLs provide from 5 A to 40 A for server and communications applications, augmenting the high-current-density 60-A models that were introduced in 2007.
The ZY2000 POLs are hardware configured via pin strapping and trim components. The ZY8000 POLs can be programmed via an I2C bus or a wizard-driven GUI. The ZY2000 and ZY8000 POLs are priced with 5-A models starting at $7 each and 40-A models starting at $16 each, in quantities of 1000.
CCFL Backlight Inverter
Fairchild Semiconductor's FAN7316 and FAN7317 integrated CCFL backlight inverter drive ICs provide space and cost savings, system reliability and simplified design for n-n half-bridge, push-pull and p-n full-bridge LCD backlight inverter designs. The FAN7316 and FAN7317, featuring a wide input-voltage range and built-in open lamp protection and open lamp regulation circuit (FAN7317 only), eliminate up to 30 external components in four lamp circuit inverter designs.
Available in a 20-pin, SOIC lead-free package, the FAN7316 costs $1.48 each and the FAN7317 costs $1.55 each in quantities of 1000.
San Jose, Calif.
Renco Electronics has expanded its RL-8100 Series of shielded SMD power inductors. This series now has seven package sizes with a total of 125 standard inductance values up to 180 H and current capabilities up to 3.5 A. This series also has a dc resistance as low as 0.018 Ω.
The special features of this series are its solderability, current rating and shielded construction. The newest package size is the smallest, measuring 4.1-mm wide × 4.1-mm high × 1.8-mm tall. The RL-8100 Series inductors cost $0.18 each in quantities of 1000.