Maxim launched MAX8822 ultra high efficiency negative charge pump white LED driver

Maxim introduced a combination of highly efficient negative charge pump with two independent, low dropout (LDO) regulator LED (WLED) driver MAX8822. The device uses a miniature, 3mm x 3mm x 0.8mm TQFN package, the single chip scheme can drive four WLED, its size is only the standard dual chip solution of 50%. MAX8822 uses a negative charge pump architecture, without high side resistance, but also in the battery during the delay from 1 times to 2 times the mode of the jump, which has the highest efficiency. The device uses an independent, adaptive switching mode to adjust the LED of each path, and even extends the battery life even when the LED forward voltage (VF) has a large mismatch. The characteristics of these innovative MAX8822 compared with similar products, can improve the efficiency of 12%, applicable to the limited space, the battery life is very important occasions, such as cellular phones, intelligent mobile phone, PDA and other handheld devices etc..

LDO regulator with 45 VRMS low noise and high PSRR output characteristics, suitable for RF, LCD board and the camera is more sensitive to noise on the occasion of the. The output voltage can be set to 16 different combinations by a simple serial pulse control interface.

MAX8822 operating at -40 DEG C to +85 C extended temperature range. Chip starts at $1.55 (2500 chips, us FOB). The evaluation board is available to speed up the design process.

Source: International Electronic Business