Battery Power - September/October 2012 - (Page 24)

NEW PRODUCTS • ICs & Semiconductors Integrated 600-mA MicroSiP Power Module Achieves 9-mm2 Solution Size and Extends Battery Life Texas Instruments, Inc. (TI) has introduced a small, integrated step-up (boost) DC/DC power module for smartphones, tablets and other portable electronics. The TPS81256 MicroSiP converter integrates the inductor and input/output capacitors to achieve a solution less than 9-mm2 and sub-1 mm height, simplifying design and saving up to 50 percent more board space versus competing solutions. Smartphone and tablet designers continue to require smaller point-of-load converters, while maintaining long battery run-time with high power conversion efficiency. The 4-MHz, 600-mA TPS81256 module supports a 5 V output with a power density of 400 mW/mm3. The device extends battery life by reducing the supply current to 43 uA during light load operation. The TPS81256 also achieves power efficiency of greater than 90 percent from an input voltage of 2.5 V to 5.5 V, enabling it to efficiently manage 3 W over a full Li-Ion battery voltage range. The TPS81256 is available now in a nine-bump, 2.6 mm by 2.9 mm by 1 mm MicroSiP package suited for automated assembly by standard surface mount equipment, and is priced at $1.70 in quantities of 1,000. percent. Its unique control architecture enables it to achieve duty cycles as low as 5 percent, while maintaining switching frequencies up to 2.25 MHz, making it well suited for high step-down ratio applications, such as 12 VIN to 1.2 VOUT conversions. Burst mode operation is used to maximize light load efficiency, requiring 300 μA (at no load), important for applications demanding maximum battery run time. For applications requiring the lowest possible noise, the LTC3626 can be configured to run in forced continuous mode, for minimum noise and potential RF interference. Furthermore, an internal die temperature monitor provides a voltage proportional to temperature, which can be programmed to limit maximum die temperatures. Additional features include a power good voltage monitor, output voltage tracking capability and short circuit protection. The LTC3626EUDC is available in a 3 mm by 4 mm QFN20. Pricing starts at $3.45 each in 1,000-piece quantities. An industrial grade version, the LTC3626IUDC offers guaranteed performance over the -40°C to 125°C operating junction temperature range, priced at $3.97 each in 1,000-piece quantities. Both versions are available from stock. Fairchild Semiconductor’s Load Switches Provide Power Efficiency, Advanced Protection Features for Mobile and Consumer Applications High-complexity mobile devices, such as smart phones, tablets, digital cameras and other consumer goods require seamless power management and battery switching in order to provide greater flexibility and better reliability. Fairchild Semiconductor’s IntelliMAX family of advanced load management switches help designers increase system protection and reduce complexity in their designs while achieving greater system power and reliability. With features such as slew rate control to prevent inrush currents, over-current limit and thermal shutdown protection, reverse current blocking and low operating input voltage, Fairchild’s comprehensive portfolio of IntelliMAX smart load switches are capable of handling a wide range of applications with multi-channel configurations and high-voltage and current loads. The expansion of the IntelliMAX series addresses the dynamic power challenges of light industrial applications with one-chip solutions that provide designers off-the-shelf capability for their design needs, reduced component counts and increased efficiency. For smart devices and portable storage devices that require a high current capability and low ON-resistance solution for power path management, the FPF1039 and FPF1048 switches offer an ON-resistance of 20 mΩ and 23 mΩ, and an input voltage range of 1.2 V to 5.5 V and 1.5 V to 5.5 V, demonstrating low shutdown current drain to help facilitate compliance in lowstandby power applications. The optimized slew rate controlled turn-on characteristics with TR = 2.7 mS prevents voltage droop on supply rails with bulk capacitances as large as 200 μF. The FPF1048 product also offers true reverse current block to avoid unwanted reverse power regardless of the device being on or off. Full-function load switches with adjustable current limits, Synchronous Step-Down Regulator Features Input And Output Current Limiting and Current Monitoring The LTC3626 from Linear Technology is a high efficiency, 3 MHz synchronous buck regulator that offers both input and output current limiting and monitoring. It incorporates a unique constant frequency/controlled on-time, current-mode architecture that delivers up to 2.5 A of continuous output current at output voltages as low as 0.6 V from a 3 mm by 4 mm QFN package. Its current-mode operation offers improved line and load transient response even with high step-down ratios. The LTC3626 operates from an input voltage range of 3.6 V to 20 V, making it suitable for a wide range of applications, including dual/multiple-cell Li-Ion battery stacks and 5 V to 18 V intermediate bus systems. Its average input current and output current limiting are pin-programmable, making it well suited for applications such as USB power. The LTC3626’s switching frequency is user programmable and synchronizable from 500 kHz to 3 MHz, enabling the use of tiny, low cost capacitors and inductors. The LTC3626 uses internal switches with RDS(ON) of 115 mOhms and 70 mOhms to deliver efficiencies as high as 95 24 Battery Power • September/October 2012

Table of Contents for the Digital Edition of Battery Power - September/October 2012

PRBA Battery Proposals Adopted By UN Transport Sub-Committee
The Use of Lithium-Ion Batteries in Uninterruptible Power Supplies
Monitor Your Battery Cells for Superior Reliability
Juicing Up the Battery: Cutting Edge Research Delivers Battery Enhancements
PEM Fuel Cell Systems – Reliable Backup Power Source for Remote or Extended Run Power Outages
Why Your Next Renewable System Should be Built Around Energy Storage
ICs & Semiconductors
Charging, Testing & Monitoring
Power Supplies
Industry News
Calendar of Events

Battery Power - September/October 2012