The RT8206A/B dual step-down, Switch Mode Power
Supply (SMPS) controller generates logic supply voltages
in battery powered systems. The RT8206A/B includes
two Pulse Width Modulation (PWM) controllers fixed at
5V/3.3V or adjustable from 2V to 5.5V. An optional external
charge pump can be monitored through SECFB
(RT8206A). This device also features a linear regulator
providing a fixed 5V output. The linear regulator provides
up to 70mA output current with automatic linear regulator
bootstrapping to the BYP input. The RT8206A/B includes
on-board power up sequencing, the power good outputs,
internal soft-start, and internal soft-discharge output that
prevents negative voltages on shutdown.
A 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 mode maintains the
switching frequency above 25kHz, which eliminates noise
in audio applications. Other features include Diode
Emulation Mode (DEM), which maximizes efficiency in
light load applications, and fixed frequency PWM mode,
which reduces RF interference in sensitive application.
The RT8206A/B is available in the WQFN-32L 5x5
z Wide Input Voltage Range 6V to 25V
z Dual Fixed 5V/3.3V Outputs or Adjustable from 2V
to 5.5V, 1.5% Accuracy
z Secondary Feedback Input Maintains Charge Pump
z Independent Enable and Power Good
z 5V Fixed LDO Output : 70mA
z 2V Reference Voltage ±1% : 50μA
z Constant ON-Time Control with 100ns Load Step
z Frequency Selectable via TON Setting
z RDS(ON) Current Sensing and Programmable Current
z Selectable PWM, DEM or Ultrasonic Mode
z Internal Soft-Start with 5 Steps Current Limiting and
z High Efficiency Up to 97%
z 5mW Quiescent Power Dissipation
z Thermal Shutdown
z RoHS Compliant and Halogen Free
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
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