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来源:LM317 Electronics Components编辑:Datel时间:2021-06-15 14:53:48

In addition, Beceem has partnered with third-party Front End Module (FEM) manufacturers to further simplify the design and layout of any remaining, external RF-related components.

National Semiconductor unveiled what it claims is the industry's first high-current LED driver that enables dual LED operation for the camera flash function in portable multimedia devices. The LM3553 drives either one or two high-current LEDs in series in handheld devices such as mobile phones, personal digital assistants (PDAs), smartphones, portable scanners and medical strobe lights.

The LM3553 is a fixed-frequency, step-up DC-DC converter with two regulated current sinks, driving loads up to 1.2A from a single-cell Li-Ion battery. The adjustable over-voltage protection circuitry allows designers to drive two high-current LEDs in a series configuration, maximizing the illumination-to-power ratio. It can drive the camera in a high-power flash mode for still photography or a low-power torch mode for video recording. To configure the driver to fit their application, designers can use the adjustable 128-flash current levels and 16-flash timer durations via an I2C compatible interface.

dc to dc converter amazon

National's flash LED driver maximizes the light output for low-power systems with peak efficiency equal to or greater than 90 percent, positioning it among National's PowerWise family of energy-efficient products.

National's LM3553 features an adjustable switch current limit for the use of small inductors with lower saturation currents. The voltage mode offers a 5V rail for backlight LEDs and audio amplifiers. One or more high-current LEDs can be driven either in a high-power flash mode or a lower-power torch mode controlled by either an internal register or the FEN and TX pins. The TX input forces the flash pulse into a low-current torch mode, allowing for synchronization to RF power amplifier events or other high-current conditions. A GPIO pin adds a hardware resource to the system. The hardware-reset pin offers full control over the device in case of system failures.

Available now, the LM3553 is priced at $1.20 each in 1,000-unit quantities. The LM3553 is offered in a 12-pin LLP package. For more information or to order samples or an evaluation board, visit: National Semiconductor.

dc to dc converter amazon

See Related Article: The multiple challenges involved in flash LED driver selection–and how to solve them.

LONDON — Siemens has developed an industrial touch-screen human machine interface application using magnetoresistive random access memory (MRAM) technology supplied by Freescale Semiconductor.

dc to dc converter amazon

The companies said the 4Mbit MRAM, the first to be commercially available according to Freescale, has been integrated into Siemens Automation Division's Simatic Multipanel MP 277 and MP 377 HMI.

Siemens (Munich, Germany) said it chose Freescale’s MRAM device as it provides an easy-to-use, non-volatile memory that maintains software-programmable logic controller (SoftPLC) process data for its HMI platforms without the need for battery-backup.

Using its CCCV circuitry, the IC intelligently controls the charging sequence from the prequalification state, through constant-current fast-charging, to the final constant-voltage charge. To enhance flexibility, the MAX8814 allows fast-charge current adjustment through an external resistor. It also features an autobooting circuit that monitors the system-booting signal and input-power status, and provides an enable signal to start system operation.

The MAX8814 is packaged in a 2 x 2-mm, 8-pin TDFN package. It is specified over the -40°C to 85°C extended temperature range. An evaluation kit is available.

Pricing: Starts at $1.15 (2500-up, FOB USA).Product information: MAX8814

Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com

Eindhoven, Netherlands—NXP Semiconductors has launched a highly integrated silicon tuner—TDA18252HN—with multi-standard digital cable reception to address the domestic Chinese set-top box (STB) market.

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