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L6756D Datasheet(PDF) 8 Page - STMicroelectronics

Part # L6756D
Description  2/3/4 phase buck controller for VR10, VR11 and VR11.1 processor applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6756D Datasheet(HTML) 8 Page - STMicroelectronics

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Pins description and connection diagrams
L6756D
8/36
2
Pins description and connection diagrams
Figure 5.
Pins connection (top view)
2.1
Pin descriptions
Table 2.
Pin description
Pin#
Name
Function
1EN
VR enable. Internally pulled-up by 10
μA to 3.3 V.
Pull-low to disable the device, set free or pull up above turn-on threshold to
enable the controller.
2 to 9
VID0 to
VID7
Voltage IDentification pins.
3.3 V compatible, they allow programming output voltage as specified in
Table 6 and Table 7 according to VR10/1 pin status.
10
PSI# / VR10
According to the status of PSI_A, the functionality of this pin changes as
below:
PSI#: Power state indicator input. Connect to the PSI# pin on the CPU to
manage low-power state. When asserted (pulled low), the controller will act as
programmed on the PSI_A pin.
VR10: It allows selecting between VR10 (short to SGND, See Table 6) or VR11
(floating, See Table 7) DACs.
11
SS
By connecting a resistor RSS to GND, it allows programming the soft-start time.
soft-start time TSS will proportionally change with a gain of
18.52 [µs / k
Ω]. Connect 27 kΩ resistor to program T2 = 500 µs. The same
slope implemented to reach VBOOT has to be considered also when the
reference moves from VBOOT to the programmed VID code. The pin is kept to a
fixed 1.24 V.


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