L5989D

www.DataSheet4U.com L5989D 4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 4 A output current (more than 5 pulsed) Operating input voltage from 2.9 V to 18 V External 1.8 V ± 2% reference voltage Output voltage from 0.6 to input voltage MLCC compatible 200 ns TON Programmable UVLO matches 3.3 V, 5 V and 12 V bus FSW programmable up to 1 MHz Voltage feed-forward Zero load current operation Programmable current limit on both switches Programmable sink current capability Pre-bias start up capability Thermal shutdown ■ ■ ■ HTSSOP 16 Applications ■ Consumer: STB, DVD, LCD TV, VCR, car radio, LCD monitors Networking: XDSL, modems, routers and switches Computer and peripherals: printers, audio / graphic cards, optical storage, hard disk drive Industrial: DC DC modules, factory automation Figure 1. Test application circuit L5989D June 2009 Doc ID 15778 Rev 1 1/51 www.st.com 51 www.DataSheet4U.com Contents L5989D Contents 1 2 3 4 5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Functional description . . ....