CIE Sept P26:new 08/09/2009 12:26 Page 26
Power Management l Product News
New 2.25-MHz, 1-A DC/DC
Digital
converter from TI
Texas Instruments has introduced the 2.25-MHz DC/DC converter for USB-powered portable
applications and wireless modems. The TPS62750 is a high-performance, 92 percent power-
efficient, synchronous step-down converter, which can provide up to 1-A typical input cur-
rent. The device supports an input voltage from 2.9 V to 6 V, allowing it to support batteries
Editions
with an extended voltage range and USB-compliant power requirements.
In addition to small size, the TPS62750 offers a high degree of performance and efficiency.
The device’s Power Save Mode operates at light load currents over the entire load current
range. In addition, the converter can discharge during shutdown.
Key features of the TPS62750 include:
• Programmable average current limiting for USB applications (50 mA to 300 mA for low
now available
current; 0.3 A to 1.3 A for high current)
• +/-10 percent current accuracy
• Input voltage monitoring prevents USB host from crashing
• Hot plug, load disconnect, short circuit (Vin/Vout) protection
Register for your
Texas Instruments |
www.ti.com
FREE editions
Maximum unveils new low-cost,
today at:
quad sink/source current DAC
Maxim Integrated Products has launched the DS4426, a low-cost, quad sink/source current
DAC with tracking control. This device is an I2C-controlled, 7-bit current DAC with four out-
put channels explicitly designed for power-supply margining and adjustment functions. Three
www.cieonline.co.uk/
of the DAC channels have additional circuitry to provide power-supply sequencing or track-
ing. Each output channel provides control of a DC-DC power supply by sinking or sourcing
current directly into the power supply's feedback node. This technique allows existing power-
digitaledition
supply designs to be margined and adjusted with minimal redesign, thus making the DS4426
ideal for any DC-DC power-supply application requiring low-cost, system-level voltage con-
trol, calibration, or margin testing. Typical end products include servers, routers, switches,
and video processing cards.
The DS4426 powers up with all DAC out-
puts in a neutral (or zero current) output con-
dition to minimize system-startup overhead
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Maxim Integrated |
www.maxim-ic.com
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The industry's first precision thin film surface-mount resistor networks and dividers to feature
a 4-mm by 4-mm dual flat no-lead package with a 0.65-mm pitch and low 1-mm profile
have been unveiled by Vishay Intertechnology. The new package format of the DFN series
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The devices feature precision ratio tolerances to ± 0.05 % and stable film and performance
characteristics of 500 ppm at 70°C for 2,000 hours. The DFN resistor networks and dividers
offer tight TCR tracking to ± 3 ppm and ± 5 ppm, respectively. These specifications make the
devices ideal for unity gain operational amplifier applications in industrial, telecommunica-
tion, military, and test and measurement instrumentation and equipment.
The DFN resistor networks offer a resistance range from 100 ! to 100 k! per element.
The dividers feature a resistance range from 1 k! to 100 k! with ratios from 2:1 to 100:1. All
devices offer power ratings of 50 mW at 70°C per resistor, very low noise of < - 30 dB, volt-
age coefficients of 0.1 ppm/V, and a temperature range of - 55 °C to 125 °C.
The DFN devices are halogen-free and qualified to Moisture Sensitivity Level 1 per J-STD-
020. Offering lead (Pb)-free or lead terminations, the resistor networks and dividers are com-
pliant with RoHS Directive 2002/95/EC and flame-resistant in accordance with UL 94 V-0.
Custom configurations of the devices are available.
Samples and production quantities of the DFN series are available now, with lead times of
eight weeks for standard orders.
Vishay Intertechnology |
www.vishay.com
26 September 2009 Components in Electronics
www.cieonline.co.uk
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