L6788ATR STMicroelectronics

L6788A 3-phase controller with embedded drivers for the next GPU generation Features 1, 2 or 3 selectable phase operation Phases self detection High current internal drivers Versatile solution: serial and parallel VID for output voltage setting VPQFN40 - 6 x 6 mm Serial BUS interface for power manager and monitoring The device manages serial BUS communication Automatic startup phase procedure to program power management functionalities as Advanced IC and VRM thermal management well as monitoring. to assure robust design and safe operation The device features automatic startup phase 5 V LDO regulator output to increases design procedure and phases self detection for safe flexibility. operation. Adjustable and precise output voltage The controller embeds 5 V LDO regulator Full differential current sense across inductor increasing design flexibility. Differential remote voltage sensing Advanced IC and VRM thermal management to LSLess startup to manage pre-biased output assure robust design and safe operation. Programmable overcurrent protection The controller assures fast protection against load overcurrent and under / overvoltage. Adjustable switching frequency Enable signal L6788A is available in VPQFN 6 x 6 mm package. VPQFN40 6x6 mm package with exposed pad Table 1. Device summary Applications Order code Package Packing Graphic card GPU supply L6788A VPQFN40 Tray High current DC-DC converters L6788ATR VPQFN40 Tape and reel Description The device implements a one-to-three phases step-down controller with three integrated high current drivers in a compact 6x6 mm body package with exposed pad. Output voltage can be selected trough serial and parallel VID up to 1.3500 V and managing D-VID with 2% output voltage accuracy. July 2009 Doc ID 15341 Rev 2 1/18 www.st.com 18Contents L6788A Contents 1 Application circuit and block diagram 3 1.1 Principle application circuit . 3 1.2 Block diagram . 4 2 Pins description and connection diagram . 5 2.1 Pin description 5 3 Maximum ratings . 10 3.1 Thermal data 10 3.2 Absolute maximum ratings 10 4 Electrical specifications . 11 4.1 Electrical characteristics 11 5 Mechanical data and package dimensions 16 6 Revision history . 17 2/18 Doc ID 15341 Rev 2