24V、白色LED、カメラ付携帯電話用フラッシュ/ストロボ電源
SUNNYVALE, CA-April 7, 2004-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX1583, a high-efficiency, step-up DC-DC converter that drives up to five white LEDs in series with a high constant current to provide camera flash/strobe power in cell phones, PDAs, and other handheld devices.
The MAX1583 integrates a 1MHz, 24V, step-up DC-DC converter and a high-voltage, low-dropout (LDO) current regulator. It operates from input voltages of 2.6V to 5.5V. Two logic inputs control four modes of operation: shutdown mode (0.5µA max); movie mode (programmable up to 100mA); precharge mode for charging a reservoir capacitor up to 24V while the LEDs are off; and strobe mode for firing the flash with a regulated current (programmable up to 300mA) during an exposure. The MAX1583 also features overvoltage and thermal shutdown protection.
The MAX1583 is available in a space-saving 3mm x 3mm, 10-pin TDFN package screened for the extended temperature range (-40°C to +85°C). It is available with three preset input-current limits, MAX1583X (1A), MAX1583Y (500mA), and MAX1583Z (250mA). Prices start at $1.70 (1000-up, FOB USA). An evaluation kit is available to speed designs.
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