RT6576A

Sample & Buy ® RT6576A/B Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT6576A/B is a dual-channel step-down controller generating supply voltages for battery-powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current and 3.3V linear regulator provides 1% accuracy under 35mA. The RT6576A/B has an oscillator output to drive the external charge pump application. Other features include on-board power-up sequencing, a powergood output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown. A constant current ripple PWM control scheme operates without sense resistors and provides 100ns response to load transient. For maximizing power efficiency, the RT6576A/B automatically switches to the diode-emulation mode in light load applications. The RT6576A/B is available in the WQFN-20L 3x3 package. Features  Support Connected Standby Mode for Ultrabook  CCRCOT Control with 100ns Load Step Response  PWM Maximum Duty Ratio > 98%  5V to 25V Input Voltage Range  Dual Adjustable Output :  CH1 : 2V to 5.5V  CH2 : 2V to 4V  5V/3.3V LDOs with 100mA Output Current  1% Accuracy on 3.3V LDO Output  Oscillator Driving Output for Charge Pump Application  Internal Frequency Setting  300kHz/355kHz (CH1/CH2)  Internal Soft-Start and Soft-Discharge  4700ppm/°C R...