L6706TR STMicroelectronics

L6706 VR11.1 single phase controller with integrated driver Features 8-bit programmable output up to 1.60000 V - Intel VR11.1 DAC High current embedded driver High output voltage accuracy Programmable droop function Imon output VFQFPN-40 6 x 6 mm Load transient boost LTB Technology to minimize the number of output capacitors Description Full differential current sense across inductor The device implements a single phase step-down Differential remote voltage sensing controller with integrated high current driver in a Adjustable voltage offset compact 6x6 mm body package with exposed pad. LSLess startup to manage pre-biased output The device embeds VR11.x DACs: the output Feedback disconnection protection voltage ranges up to 1.60000 V managing D-VID Preliminary overvoltage protection with high output voltage accuracy over line and Programmable overcurrent protection temperature variations. Programmable overvoltage protection Imon capability guarantee full compatibility with Adjustable switching frequency VR11.1 enabling additional power saving technique. SSEND and OUTEN signal Programmable droop function allows to supply all VFQFPN-40 6x6 mm package with exp. pad the latest Intel CPU rails. Applications Load transient boost LTB Technology reduces system cost by providing the fastest response to VTT and VAXG rails load transition. CPU power supply The controller assures fast protection against load High density DC/DC converters over current and under / over voltage. Feedback disconnection prevents from damaging the load in case of disconnections in the system board. In case of over-current, the system works in constant current mode until UVP. Table 1. Device summary Order codes Package Packing L6706 Tray VFQFPN-40 L6706TR Tape and reel January 2010 Doc ID 15698 Rev 2 1/47 www.st.com 47 Contents L6706 Contents 1 Principle application circuit and block diagram . 4 1.1 Principle application circuit . 4 1.2 Block diagram . 5 2 Pins description and connection diagrams 6 2.1 Pin description 6 2.2 Thermal data . 9 3 Electrical specifications . 10 3.1 Absolute maximum ratings 10 3.2 Electrical characteristics 11 4 Voltage identifications 13 5 Device description . 16 6 DAC and current reading 17 7 Differential remote voltage sensing . 19 8 Voltage positioning . 20 8.1 Offset (optional) 20 8.2 Droop function . 21 9 Droop thermal compensation 23 10 Output current monitoring (IMON) . 24 11 Load transient boost technology 26 12 Dynamic VID transitions . 28 13 Enable and disable . 30 14 Soft-start . 31 2/47 Doc ID 15698 Rev 2