RT6542A Datasheet | Richtek

Description The RT6542A PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook puters. The RT6542A supports on chip voltage programming function between 0.85V and 1.05V by controlling GX digital inputs. The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The RT6542A achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs and enter diode emulation mode at light load condition. The buck conversion allows this device to directly step down high voltage batteries at the highest possible efficiency. The RT6542A is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.7V. The RT6542A is available in a WDFN-14L 3x2 package. Features - Intel Cannon VR Support - Built-in 1% Reference Voltage - 2-Bit Programmable Output Voltage with Integrated Transition Support - Support Intel LPM (Low-Power Mode) Feature - 4700ppm/°C Programmable Current Limit by Low- Side RDS(ON) Sensing - 3V to 26V Battery Input Range - Internal Voltage Ramp Soft-Start Control - Drives Large Synchronous Rectifier FETs - Integrated Boost Switch - Over/Under-Voltage Protection - Thermal Shutdown - Power Good Indicator - Ro HS pliant and Halogen Free - Tiny 14-Lead WDFN Package Applications - Notebook puters - CPU/GPU Core Supply - Chipset/RAM Supply - Generic DC-DC Power Regulator Simplified Application Circuit VCC CBYPASS UGATE BOOT R2 PGOOD PHASE LGATE RCS CS GND MODE RGND FB...