The MAX8732A/MAX8733A/MAX8734A dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732A/MAX8733A/MAX8734A 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 out puts. Each linear regulator provides up to 100mA output

current with automatic linear-regulator bootstrapping to the main SMPS outputs. The MAX8732A/MAX8733A/MAX8734A 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. Additionally, the outputs are highimpedance when VCCfalls below its UVLO set point while the outputs are enabled.

特性 Features

?No Current-Sense Resistor Needed (MAX8734A)

?Accurate Current Sense with Current-Sense Resistor (MAX8732A/MAX8733A)

?1.5 Output Voltage Accuracy

?3.3V and 5V 100mA Bootstrapped Linear Regulators

?Internal Soft-Start and Soft-Stop Output Discharge

?Quick-PWM with 100ns Load Step Response

?3.3V and 5V Fixed or Adjustable Outputs (Dual Mode?)

?4.5V to 24V Input Voltage Range

?Enhanced Ultrasonic Pulse-Skipping Mode (25kHz min)

?Power-Good (PGOOD) Signal

?Overvoltage Protection Enable/Disable

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