G5617B

Global Mixed-mode Technology G5617A/G5617B Programmable Output High-Speed Step-Down Controller for Notebook Computer Features „ Ultra-High Efficiency „ No Current-Sense Resistor (Lossless ILIMIT) „ Quasi-PWM with 100ns Load-Step Response „ 1% VOUT Accuracy Over Line and Load „ 0.75V to 3.6V Adjustable Output Range „ Dynamic Voltage Scaling by G0 and G1 Inputs „ 4.5V to 24V Battery Input Range „ OVP & UVP „ Built-in BST Diode „ 1.7ms Soft-Start „ Drives Large Synchronous-Rectifier FETs „ Power-Good Indicator „ G0/G1 High Active (G5617A) G0/G1 Low Active (G5617B) Applications „ Notebook Computers „ CPU Core Supply „ Chipset/RAM Supply as Low as 0.75V „ 1.8V and 2.5V I/O Supply „ Networking Power Supply Ordering Information ORDER NUMBER G5617AR41U G5617BR41U Note:R4:TQFN3X3-16 1: Bonding Code U: Tape & Reel Pin Configuration MARKING 5617A 5617B General Description G5617A/G5617B PWM controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The G5617A/G5617B achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternat...