RT8205AGQW

Product Summary

The RT8205AGQW is a dual step-down, switch-mode power supply controller. It generates logic-supply voltages in battery-powered systems. The RT8205AGQW 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 RT8205AGQW 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 RT8205AGQW include Notebook and Sub-Notebook Computers and 3-Cell and 4-Cell Li+ Battery-Powered Devices.

Parametrics

RT8205AGQW absolute maximum ratings: (1)VIN, EN to GND: -0.3V to 28V; (2)PHASEx to GND DC: -0.3V to 28V; (3)＜20ns: -8V; (4)BOOTx to PHASEx: -0.3V to 6V; (5)ENTRIPx, SKIPSEL, TONSEL, PGOOD, to GND: -0.3V to 6V; (6)VREG5, VREG3, FBx, VOUTx, SECFB, REF to GND: -0.3V to (VREG5 + 0.3V); (7)UGATEx to PHASEx DC: -0.3V to (VREG5 + 0.3V); (8)＜20ns: -5V; (9)LGATEx to GND DC: -0.3V to (VREG5 + 0.3V); (10)＜20ns: -2.5V; (11)Power Dissipation, PD @ TA = 25℃ WQFN-24L 4x4: 1.923W; (12)Package Thermal Resistance (Note 2) WQFN-24L 4x4, θJA: 52℃/W; (13)WQFN-24L 4x4, θJC: 7℃/W; (14)Lead Temperature (Soldering, 10 sec.): 260℃; (15)Junction Temperature: 150℃; (16)Storage Temperature Range: -65℃ to 150℃; (17)ESD Susceptibility (Note 3) HBM (Human Body Model): 2kV.

Features

RT8205AGQW 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