L5986 2.5 A step-down switching regulator Datasheet - production data Industrial: chargers, PLD, PLA, FPGA Networking: XDSL, modems, DC-DC modules Computer: optical storage, hard disk drive, printers, audio/graphic cards VFQFPN8 3 x 3 mm HSOP8 exposed pad LED driving Description Features The L5986 is a step-down switching regulator 2.5 A DC output current with a 3.0 A (min.) current limited embedded Power MOSFET, so it is able to deliver up to 2.5 A 2.9 V to 18 V input voltage current to the load depending on the application Output voltage adjustable from 0.6 V conditions. 250 kHz switching frequency, programmable The input voltage can range from 2.9 V to 18 V, up to 1 MHz while the output voltage can be set starting from Internal soft-start and inhibit 0.6 V to V . Having a minimum input voltage of IN Low dropout operation: 100% duty cycle 2.9 V, the device is suitable also for a 3.3 V bus. Voltage feedforward Requiring a minimum set of external components, the device includes an internal 250 kHz switching Zero load current operation frequency oscillator that can be externally Overcurrent and thermal protection adjusted up to 1 MHz. VFQFPN 3 x 3 mm -8L and HSOP8 package The QFN and the HSOP packages with an exposed pad allow reducing the R down to thJA Applications 60 C/W and 40 C/W respectively. Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors Figure 1. Application circuit May 2014 DocID14971 Rev 5 1/42 This is information on a product in full production. www.st.comContents L5986 Contents 1 Pin settings 4 1.1 Pin connection 4 1.2 Pin description 4 2 Maximum ratings 5 3 Thermal data . 5 4 Electrical characteristics . 6 5 Functional description . 8 5.1 Oscillator and synchronization 9 5.2 Soft-start .11 5.3 Error amplifier and compensation 12 5.4 Overcurrent protection . 13 5.5 Inhibit function . 14 5.6 Hysteretic thermal shutdown 14 6 Application information . 15 6.1 Input capacitor selection 15 6.2 Inductor selection . 16 6.3 Output capacitor selection 17 6.4 Compensation network . 18 6.4.1 Type III compensation network . 19 6.4.2 Type II compensation network 23 6.5 Thermal considerations 27 6.6 Layout considerations . 28 6.7 Application circuit . 30 7 Application ideas . 34 7.1 Positive buck-boost . 34 7.2 Inverting buck-boost . 36 2/42 DocID14971 Rev 5