RT8209P Datasheet | Richtek

® RT8209N/P Single Synchronous Buck Controller General Description The RT8209N/P 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 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 RT8209N/P 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. The buck conversion allows this device to directly step down high voltage batteries for low voltage supplies as low as 0.75V. The RT8209N is in a WQFN16L 3x3 package, the RT8209P is in a WQFN-14L 3.5x3.5 package. Ordering Information RT8209 Package Type QW : WQFN-16L 3x3 (W-Type) QW : WQFN-14L 3.5x3.5 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) N : WQFN-16L 3x3 P : WQFN-14L 3.5x3.5 Note : Richtek products are : ` Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in Sn Pb or Pb-free soldering processes. Features z Ultra High Efficiency z Resistor Programmable Current Limit by Low Side RDS(ON) Sense (Lossless Limit) z 4700ppm/°C Current Sensing z Quick Load Step Response within 100ns z 1% VFB Accuracy over Line and Load z 4.5V to 26V Battery Input Range z Resistor Programmable Frequency z Integrated Bootstrap Switch z Integrated Negative Current Limiter z Over/Under Voltage Protection z Internal Soft-Start and Soft-Discharge Output z Power Good Indicator z Ro HS pliant and Halogen Free Applications z Notebook puters z System Power Supplies z I/O Supplies Pin Configurations (TOP...