MAX8667

The MAX8667 dual step-down converters with dual low-dropout (LDO) linear regulators are intended to power low-voltage microprocessors or DSPs in portable devices. They feature high efficiency with small external component size.The 1.5MHz hysteretic-PWM control scheme allows for tiny external components and reduces no-load operating current to 100A with all outputs enabled. Dual low-quiescent-current, low-noise LDOs operate down to 1.7V supply voltage. The MAX8667 has individual enables for each output, maximizing flexibility.

Features of the MAX8667 are:(1)tiny, thin QFN 3mm x 3mm package; (2)individual enables; (3)600mA Guaranteed Output Current on OUT1; (4)1200mA guaranteed output current on OUT2; (5)Tiny Size 2.2H Chip inductor (0805); (6)ultra-fast line and load transients; (7)low 25¦ÌA supply current each; (8)300mA guaranteed; (9)low 1.7V minimum supply voltage; (10)low output noise.

The absolute maximum ratings of the MAX8667 can be summarized as:(1)operating temp:-40 to 85;(2)PGND1, PGND2 to GND:-0.3V to +0.3V;(3)LX1, LX2 to GND (Note 1):-0.3V to (VIN12 + 0.3V);(4)LX1, LX2 current:1.5A;(5)storage temp:-65 to 150;(6)lead temperature (soldering, 10s):300.Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.High switching frequencies and relatively large peak currents of MAX8667 make PCB layout a very important aspect of design. Good design minimizes excessive EMI on the feedback paths and voltage gradients in the ground plane, both of which can result in instability or regulation errors. Connect the input capacitors as close as possible to the IN_ and PGND_ pins. Connect the inductor and output capacitors as close as possible to the IC and keep the traces short, direct, and wide.The feedback network traces of MAX8667 are sensitive to inductor magnetic field interference. Route these traces away from the inductors and noisy traces such as LX. Keep the feedback components close to the FB_ pin.