Maxim Integrated Products has introduced the MAX8884Y/MAX8884Z 700 mA step-down converters with dual 300 mA LDOs in a 2 mm x 2 mm CSP (chip-scale package).
The on-board, hysteretic, PWM-controlled step-down converter provides two switching-frequency options to allow designers to optimize for highest efficiency (2 MHz) or smallest solution size (4 MHz). The individual logic on/off controls for each output allow the user full control over output sequencing. To further enhance flexibility, the MAX8884Y/MAX8884Z have individual enables for the step-down converter and two LDO outputs, as well as pin-selectable output voltages for the step-down converter (1.2 V/1.8 V) and one LDO (1.8 V/2.8 V).
Combining flexible control with high efficiency (>90 percent) and a compact footprint, the MAX8884Y/MAX8884Z are well suited for powering multiload applications in portable devices such as cell phones, smartphones, MP3 and DVD players, and digital cameras/camcorders.
These buck converter ICs integrate three discrete devices into one chip to reduce pick-and-place and inventory costs, while saving board space for other value-added features. The two low-quiescent-current LDOs operate from an input voltage as low as 2.7 V, generate only 26 microVrms (typ) output noise, and have a 65 dB (typ) PSRR. The step-down converter guarantees 700 mA output current with low output-voltage ripple ranging from15 mVp-p to 20 mVp-p. The converter also integrates a synchronous rectifier to eliminate the need for an external Schottky diode, while its high-frequency switching allows the use of tiny external components to minimize solution size.
Availability and Pricing
The MAX8884Y/MAX8884Z offers a low-power (0.1 microamps, typ) shutdown mode. Both devices feature thermal-overload and overcurrent protection, and are fully specified to operate over the -40 to +85 degrees Celsius extended temperature range. The MAX8884Y/MAX8884Z are available in a lead-free, 2 mm x 2 mm x 0.7 mm, 16-bump CSP. Prices start at $1.45 (2500-up, FOB USA).