L5980 0.7 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 LED driving Features Description 0.7 A DC output current The L5980 is a step-down switching regulator with a 1 A (min.) current limited embedded Power 2.9 V to 18 V input voltage MOSFET, so it is able to deliver in excess of 0.7 A Output voltage adjustable from 0.6 V DC current to the load depending on the 250 kHz switching frequency, programmable application condition. up to 1 MHz The input voltage can range from 2.9 V to 18 V, Internal soft-start and inhibit while the output voltage can be set starting from Low dropout operation: 100% duty cycle 0.6 V to V . Having a minimum input voltage of IN 2.9 V, the device is suitable also for a 3.3 V bus. Voltage feedforward Requiring a minimum set of external components, Zero load current operation the device includes an internal 250 kHz switching Overcurrent and thermal protection frequency oscillator that can be externally VFQFPN8 3 x 3 mm package adjusted up to 1 MHz. The VFQFPN8 package with an exposed pad Applications allows reducing the R down to approximately thJA 60 C/W. Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors Figure 1. Application circuit May 2014 DocID13003 Rev 7 1/41 This is information on a product in full production. www.st.comContents L5980 Contents 1 Pin settings 3 1.1 Pin connection 3 1.2 Pin description 3 2 Maximum ratings 4 2.1 Absolute maximum ratings . 4 2.2 Thermal data . 4 3 Electrical characteristics . 5 4 Functional description . 7 4.1 Oscillator and synchronization 8 4.2 Soft-start 10 4.3 Error amplifier and compensation .11 4.4 Overcurrent protection 11 4.5 Inhibit function . 13 4.6 Hysteretic thermal shutdown 13 5 Application information . 14 5.1 Input capacitor selection 14 5.2 Inductor selection . 15 5.3 Output capacitor selection 16 5.4 Compensation network . 17 5.4.1 Type III compensation network . 18 5.4.2 Type II compensation network 22 5.5 Thermal considerations 26 5.6 Layout considerations . 27 5.7 Application circuit . 29 6 Application ideas . 33 6.1 Positive buck-boost . 33 6.2 Inverting buck-boost . 35 2/41 DocID13003 Rev 7