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L6714
4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
Features
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0.5% output voltage accuracy 7/8 bit programmable output up to 1.60000V Intel VR10.x, VR11 DAC 6 bit programmable output up to 1.5500V AMD 6Bit DAC High current integrated gate drivers Full differential current sensing across inductor or low side MOSFET Embedded VRD thermal monitor Integrated remote sense buffer Dynamic VID management Adjustable reference voltage offset Programmable Soft-Start Low-Side-Less startup Programmable over voltage protection Preliminary over voltage Constant over current protection Oscillator internally fixed at 150kHz externally adjustable Output enable SS_END / PGOOD signal TQFP64 10mm x 10mm package with Exposed Pad
TQFP64 (Exposed Pad)
Description
L6714 implements a four phase step-down controller with 90º phase-shift between each phase with integrated high current drivers in a compact 10mm x 10mm body package with exposed pad. The device embeds selectable DACs: the output voltage ranges up to 1.60000V (both Intel VR10.x and VR11 DAC) or up to 1.5500V (AMD 6Bit DAC) managing D-VID with ±0.5% output voltage accuracy over line and temperature variations. Additional programmable offset can be added to the reference voltage with a single external resistor. The controller assures fast protection against load over current and under / over voltage (in this last case also before UVLO). In case of over-current the system works in Constant Current mode until UVP. Selectable current reading adds flexibility to the design allowing current sense across inductor or LS MOSFET. System Thermal Monitor is also provided allowing system protection from over-temperature conditions.
Package TQFP64 TQFP64 Packaging Tube Tape and reel
Application
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High current VRD for desktop CPUs Workstation and server CPU power supply VRM modules
Order codes
Part number L6714 L6714TR
November 2006
Rev 3
1/70
www.st.com 70
Contents
L6714
Contents
1 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 2.2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 3.2 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 VID Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . ..