G5617A/G5617B Global Mixed-mode Technology Programmable Output High-Speed Controller for Notebook Computer Step-Down Features 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. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The G5617A/G5617B is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 0.75V. It provides four resistor-programmable output voltages by G0 and G1 digital inputs. 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 The G5617A/G5617B is available in 16-pin TQFN (3X3) package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5617AR41U G5617BR41U 5617A 5617B -40°C to +85°C -40°C to +85°C TQFN3X3-16 TQFN3X3-16 Note:R4:TQFN3X3-16 1: Bonding Code U: Tape & Reel TON EN_SKIP G1 BST 15 14 13 8 4 DL PGOOD 7 3 G0 FB Thermal Pad 6 2 D0 VCC 17 GND 5 1 D1 OUT 16 Pin Configuration 12 DH 11 LX 10 ILIM 9 VDD G5617A/G5617B TQFN3X3-16 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Nov 09, 2011 1