RT8205L = EM
The RT8205L/M is a dual step-down, switch mode power
supply controller generating logic-supply voltages in
battery powered systems. It includes two Pulse-Width
Modulation (PWM) controllers adjustable from 2V to 5.5V,
and also features fixed 5V/3.3V linear regulators. Each
linear regulator provides up to 100mA output current with
automatic linear regulator bootstrapping to the PWM
outputs. An optional external charge pump can be
monitored through SECFB (RT8205M). The RT8205L/M
includes on-board power up sequencing, a power good
output, internal soft-start, and internal soft-discharge
output that prevents negative voltage during shutdown.
The constant on-time PWM control scheme operates
without sense resistors and provides 100ns response to
load transient response while maintaining nearly constant
switching frequency. To eliminate noise in audio
applications, an ultrasonic mode is included, which
maintains the switching frequency above 25kHz. Moreover,
the diode-emulation mode maximizes efficiency for light
load applications.
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