RT8205CGQW

Product Summary

The RT8205CGQW is a dual step-down, switch-mode power supply controller. It generates logic-supply voltages in battery-powered systems. The RT8205CGQW includes two pulse-width modulation (PWM) controllers fixed at 5V/3.3V or adjustable from 2V to 5.5V. An alternative LGATE1 output LG1_CP can be used for external charge pump (RT8205B). And an optional external charge pump can be monitored through SECFB (RT8205C). This device also features 2 linear regulators providing fixed 5V and 3.3V outputs. The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping to the PWM outputs. The RT8205CGQW includes on-board power-up sequencing, the power-good output, internal softstart, and internal soft-discharge output that prevents negative voltages on shutdown. The applications of the RT8205CGQW include Notebook and Sub-Notebook Computers and 3-Cell and 4-Cell Li+ Battery-Powered Devices.

Parametrics

RT8205CGQW features: (1)Wide Input Voltage Range: 6V to 25V; (2)Dual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy.; (3)Alternative LGATE1 Output (LG1_CP) acts as Clock for Charge Pump (RT8205B); (4)Secondary Feedback Input Maintains Charge Pump Voltage (RT8205C); (5)Fixed 3.3V and 5V LDO Output : 70mA; (6)2V Reference Voltage ±1% : 50μA; (7)Constant ON-Time Control with 100ns Load Step Response; (8)Frequency Selectable via TONSEL Setting; (9)RDS(ON) Current Sensing and Programmable Current Limit combined with Enable Control; (10)Selectable PWM, DEM, or Ultrasonic Mode; (11)Internal Soft-Start and Soft-Discharge; (12)High Efficiency up to 97%; (13)5mW Quiescent Power Dissipation; (14)Thermal Shutdown; (15)RoHS Compliant and Halogen Free.

Features

RT8205CGQW features: (1)Wide Input Voltage Range 6V to 25V; (2)Dual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy.; (3)Alternative LGATE1 Output (LG1_CP) acts as Clock for Charge Pump (RT8205B); (4)Secondary Feedback Input Maintains Charge Pump Voltage (RT8205C); (5)Fixed 3.3V and 5V LDO Output : 70mA; (6)2V Reference Voltage ±1% : 50μA; (7)Constant ON-Time Control with 100ns Load Step Response; (8)Frequency Selectable via TONSEL Setting; (9)RDS(ON) Current Sensing and Programmable Current Limit combined with Enable Control; (10)Selectable PWM, DEM, or Ultrasonic Mode; (11)Internal Soft-Start and Soft-Discharge; (12)High Efficiency up to 97%; (13)5mW Quiescent Power Dissipation; (14)Thermal Shutdown; (15)RoHS Compliant and Halogen Free.

Diagrams