Richtek USA Inc. RT8204AGQW

Description
The RT8204A is a single synchronous buck with LDO controller designed for high efficiency, excellent transient response, and high DC output accuracy. It is suitable for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers.
The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides a quick load step response within 100ns. The RT8204A achieves high efficiency by eliminating the current sense resistor found in traditional current mode PWMs and by driving large synchronous-rectifier MOSFETs.
The built-in LDO controller can drive an external N-MOSFET to provide a second output voltage from the PWM output or other power source. The RT8204A can provide adjustable voltage down to 0.75V, and the maximum output voltage depends on the selected MOSFET.

Features

PWM Controller
Ultra-high efficiency
Resistor programmable current limit by low side Ros(ON) sense (lossless limit) or sense resistor (high accuracy)
Quick load step response within 100ns
1% VOUT accuracy over line and load
Adjustable 0.75V to 3.3V output range
3V to 26V battery input range
Resistor programmable frequency
Over/under voltage protection
2 steps current limit during soft-start
Drives large synchronous-rectifier FETs
Power good indicator

LDO Controller
1.5% accuracy over line and load
Adjustable output voltage down to 0.75V
Independent enable and power good indicator
Drives N-MOSFETs within rail-to-rail controller voltage
MLCC and POSCAP stable

Applications
Notebook computers
CPU core supply
Chipset/RAM supply as low as 0.75V