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Partno	Mfg	Dc	Qty	Available	Descript
L6788A	ST	N/a	6470	avai	3-phase controller with embedded drivers for the next GPU generation
L6788ATR	ST	N/a	186	avai	3-phase controller with embedded drivers for the next GPU generation

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L6788A-L6788ATR
3-phase controller with embedded drivers for the next GPU generation
July 2009 Doc ID 15341 Rev 2 1/18
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 Serial BUS interface for power manager and
monitoring Automatic startup phase procedure Advanced IC and VRM thermal management
to assure robust design and safe operation 5 V LDO regulator output to increases design
flexibility. Adjustable and precise output voltage Full differential current sense across inductor Differential remote voltage sensing LSLess startup to manage pre-biased output Programmable overcurrent protection Adjustable switching frequency Enable signal VPQFN40 6x6 mm package with exposed pad
Applications Graphic card GPU supply High current DC-DC converters
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.
The device manages serial BUS communication
to program power management functionalities as
well as monitoring.
The device features automatic startup phase
procedure and phases self detection for safe
operation.
The controller embeds 5 V LDO regulator
increasing design flexibility.
Advanced IC and VRM thermal management to
assure robust design and safe operation.
The controller assures fast protection against load
overcurrent and under / overvoltage.
L6788A is available in VPQFN 6 x 6 mm package.
Table 1. Device summary
Contents L6788A
2/18 Doc ID 15341 Rev 2
Contents Application circuit and block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Principle application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pins description and connection diagram . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
L6788A Application circuit and block diagram
Doc ID 15341 Rev 2 3/18 Application circuit and block diagram
1.1 Principle application circuit
Figure 1. Principle application circuit (a)
Application circuit and block diagram L6788A
4/18 Doc ID 15341 Rev 2
1.2 Block diagram
Figure 2. Block diagram Refer to the application note for the reference schematic
L6788A Pins description and connection diagram
Doc ID 15341 Rev 2 5/18 Pins description and connection diagram
Figure 3. Pin connection (top view)
2.1 Pin description
Table 2. Pin description
Pins description and connection diagram L6788A
6/18 Doc ID 15341 Rev 2
Table 2. Pin description (continued)
L6788A Pins description and connection diagram
Doc ID 15341 Rev 2 7/18
Table 2. Pin description (continued)
Pins description and connection diagram L6788A
8/18 Doc ID 15341 Rev 2
Table 2. Pin description (continued)
L6788A Pins description and connection diagram
Doc ID 15341 Rev 2 9/18
Table 2. Pin description (continued)