MAX8733 Datasheet | Maxim Integrated

Description The MAX8732/MAX8733/MAX8734 dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732/MAX8733/MAX8734 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each .. linear regulator provides up to 100m A output current with automatic linear-regulator bootstrapping to the main SMPS outputs. The MAX8732/MAX8733/MAX8734 include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. Maxim’s proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25k Hz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The MAX8732 features a 200k Hz/5V and 300k Hz/3.3V SMPS for highest efficiency, while the MAX8733 features a 400k Hz/5V and 500k Hz/3.3V SMPS for “thin and light” applications. The MAX8734 provides a pin-selectable switching frequency, allowing either 200k Hz/300k Hz or 400k Hz/500k Hz operation of the 5V/3.3V SMPSs, respectively. The MAX8732/MAX8733/MAX8734 are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C). The MAX8732/MAX8733/MAX8734 are pin-for-pin upgrades to the MAX1777/MAX1977/MAX1999. The MAX1999 Evaluation Kit can be used to evaluate the MAX8732/MAX8733/MAX8734. Features - No Current-Sense Resistor Needed (MAX8734) - Accurate Current Sense with Current-Sense Resistor (MAX8732/MAX8733) -...