When you try to cram more features into a cell phone, iPod or virtually any kind of electronic device, you need more power. And — as a result — you need power management integrated circuits (ICs) to regulate that power.
“All electronic products use power management ICs,” says Jaime Tseng, design manager for the Power Products Group at Linear Technology Corp. “Wherever there's an electronic device that has to drive a display or charge a battery, there's a need.”
As we did in the last issue of Design News (10.09.06), we're offering you a glimpse of some of the latest in power management IC technology. The following are products from Linear Technology, Microchip Technology Inc. and Qualcomm Inc., all of which share a common trait — they help designers regulate power in a power-hungry world.
Synchronous Buck Regulator
Linear Technology's LTC3547 dual-channel, 2.25-MHz synchronous buck regulator is aimed at cell phones, video cameras and a host of other portable applications. It delivers up to 300 mA of continuous output current per channel from a tiny 3 × 2 mm DFN package, and gives customers the ability to provide two signal outputs — for example, baseband and amplifier — on applications such as cell phones. Using a constant frequency current mode architecture, the LTC3547 operates from an input voltage range of 2.5 to 5.5V, making it a candidate for lithium ion or nickel-metal hydride batteries, among others. It can generate output voltages as low as 0.6V, enabling it to power low-voltage DSPs and microcontrollers. Get more information on Linear Technology's LTC3547.
Qualcomm's Handset IC
Qualcomm Inc.'s PM7500 IC is said to be an enabler for thinner mobile handsets, while offering video output and longer battery life. It integrates advanced capabilities, such as TV-out amplifier, camera flash support, full charging system, backlighting, USB On-The-Go transceiver and stereo far-field speaker amplification. It also features a 9 × 9 mm package and high-level of integration in order to support advanced wireless capabilities with fewer external components, reduced bill-of-material costs and quicker time-to-market. Get more information about Qualcomm's PM7500.
MOSFET Driver Circuits
Microchip Technology's TC4451 and TC4452 MOSFET driver circuits are aimed at industrial applications that use power supplies, and at motor control systems. The new drivers offer peak output currents of 12A, putting them among the highest-current MOSFET drivers in industry. The devices feature latch-up immunity and a fast drive speed of 15 nF in 27 nS, which equip them with the high-power switching speeds to drive large MOSFETs and IGBTs in high-current applications. Get more information about the new MOSFET driver circuits.