L5988D 4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification Datasheet - production data F programmable up to 1 MHz SW Voltage feed forward Zero load current operation Programmable current limit on both switches Programmable sink current capability Pre-bias start up capability Thermal shutdown HTSSOP16 Applications Features Consumer: STB, DVD, LCD TV, VCR, car radio, LCD monitors 4 A output current (more than 5 pulsed) Networking: XDSL, modems, routers and Operating input voltage from 2.9 V to 18 V switches External 1.8 V 2% reference voltage Computer and peripherals: printers, audio / Output voltage from 0.6 to input voltage graphic cards, optical storage, hard disk drive MLCC compatible Industrial: DC-DC modules, factory automation 200 ns T ON HC LED driving Programmable UVLO matches 3.3 V, 5 V and 12 V bus Figure 1. Test application circuit April 2015 DocID15324 Rev 4 1/52 This is information on a product in full production. www.st.comContents L5988D Contents 1 Description . 6 2 Pin function 7 3 Maximum ratings 8 4 Electrical characteristics . 9 5 Functional description 12 5.1 Multifunction pin 13 5.2 Oscillator and synchronization . 15 5.3 External voltage reference 18 5.4 Soft-start 18 5.5 Monitoring and protections 19 5.5.1 Overvoltage 19 5.5.2 Current limiting 21 5.5.3 UVLO . 23 5.5.4 Thermal shutdown . 23 5.6 Minimum on time . 23 5.7 Error amplifier 24 6 Application information . 25 6.1 Input capacitor selection 25 6.2 Inductor selection . 26 6.3 Output capacitor selection 27 6.4 Compensation network . 28 6.4.1 Type III compensation network . 29 6.4.2 Type II compensation network 33 6.5 R.M.S. current of the embedded power MOSFETs . 36 6.6 Thermal considerations 37 6.7 Layout considerations . 41 6.8 Application circuit . 43 2/52 DocID15324 Rev 4