L6713ATR STMicroelectronics

L6713A 2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs Features Load transient boost LTB Technology to minimize the number of output capacitors (patent pending) Dual-edge asynchronous PWM TQFP64 (Exposed pad) Selectable 2 or 3 phase operation 0.5 % output voltage accuracy Description 7/8 bit programmable output up to 1.60000 V - L6713A implements a two/three phase step-down Intel VR10.x, VR11 DAC controller with 180/120 phase-shift between 6 bit programmable output up to 1.5500 V - each phase with integrated high current drivers in AMD 6 bit DAC a compact 10x10 mm body package with exposed High current integrated gate drivers pad.The 2 or 3 phase operation can be easily selected through PHASE SEL pin. Full differential current sensing across inductor Embedded VRD thermal monitor Load transient boost LTB Technology (patent pending) reduces system cost by providing the Differential remote voltage sensing fastest response to load transition therefore Dynamic VID management requiring less bulk and ceramic output capacitors Adjustable voltage offset to satisfy load transient requirements. Low-side-less startup LTB Technology can be disabled and in this condition the device works as a dual-edge Programmable soft-start asynchronous PWM. Programmable over voltage protection The device embeds selectable DACs: the output Preliminary over voltage protection voltage ranges up to 1.60000 V (both Intel VR10.x Programmable over current protection and VR11 DAC) or up to 1.5500 V (AMD 6BIT Adjustable switching frequency DAC) managing D-VID with 0.5% output voltage accuracy over line and temperature variations. Output enable The controller assures fast protection against load SS END / PGOOD signal over current and under / over voltage (in this last TQFP64 10x10 mm package with exposed pad case also before UVLO). In case of over-current the device turns off all MOSFET and latches the Applications condition. High current VRD for desktop CPUs System thermal monitor is also provided allowing Workstation and server CPU power supply system protection from over-temperature conditions. VRM modules Table 1. Device summary Order codes Package Packaging L6713A Tube TQFP64 (Exposed pad) L6713ATR Tape and reel August 2008 Rev 3 1/64 www.st.com 64Contents L6713A Contents 1 Block diagram 5 2 Pin settings 6 2.1 Pin connection 6 2.2 Pin description 7 3 Electrical data . 12 3.1 Maximum ratings . 12 3.2 Thermal data 12 4 Electrical characteristics 13 5 VID Tables 16 5.1 Mapping for the Intel VR11 mode . 16 5.2 Voltage identification (VID) for Intel VR11 mode . 16 5.3 Voltage identifications (VID) for Intel VR10 mode + 6.25 mV 18 5.4 Mapping for the AMD 6 bit mode . 20 5.5 Voltage identifications (VID) codes for AMD 6 bit mode 20 6 Reference schematic . 22 7 Device description . 26 8 Configuring the device 28 8.1 Number of phases selection . 28 8.2 DAC selection 28 9 Power dissipation 30 10 Current reading and current sharing loop 32 11 Differential remote voltage sensing . 34 2/64