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L6740L Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce L6740L
Description  Hybrid controller (41) for AMD SVID and PVID processors
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6740L Fiches technique(HTML) 9 Page - STMicroelectronics

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L6740L
Pins description and connection diagrams
9/44
7
FBG
Remote ground sense.
Connect to the negative side of the load for remote sensing. See
Section 9 for proper layout of this connection.
8OS
Offset programming pin.
Internally set to 1.24V. Connecting a ROS resistor to SGND allows to set
a current that is mirrored into FB pin in order to program a positive off-
set according to the selected RFB.
Short to SGND to disable the function. See Section 6.4 for details.
9LTB
LTB TechnologyTM Input pin.
Connect through an RLTB - CLTB network to the regulated voltage
(CORE Section) to detect load transient. See Section 10 for details.
10
OVP / V_FIX
OVP. Over Voltage Programming Pin. Internally pulled-up to 3.3V by
11
µA. Connect to SGND through a R
OVP resistor and filter with 10nF
(typ) to set a fixed voltage according to the ROVP resistor. If floating it
will program 3.3V threshold. See Section 7 for details.
V_FIX - Hardware override. Short to SGND to enter VFIX mode
(WARNING: this condition overrides any code programmed on the VIDx
lines). In this case, the device will use SVI inputs as static VIDs and
OVP threshold will be set to 1.8V. See Section 5.4.5 for details.
11
LTB_GAIN
LTB TechnologyTM gain pin.
Connect to SGND through a resistor RLTBGAIN to program the LTB
Gain. See Section 10 for details.
12
PSI_L
Power Saving Indicator (SVI Mode).
Open-drain Input/Output pin. See Section 5.4.3 for details.
13
CS1+
Channel 1 Current Sense Positive Input. Connect through an R-C filter
to the phase-side of the channel 1 inductor.
See Section 9 for proper layout of this connection.
14
CS1-
Channel 1 Current Sense Negative Input. Connect through a RG resis-
tor to the output-side of the channel inductor.
See Section 9 for proper layout of this connection.
15
CS2+
Channel 2 Current Sense Positive Input. Connect through an R-C filter
to the phase-side of the channel 2 inductor.
See Section 9 for proper layout of this connection.
16
CS2-
Channel 2 Current Sense Negative Input. Connect through a RG resis-
tor to the output-side of the channel inductor.
See Section 9 for proper layout of this connection.
17
CS3+
Channel 3 Current Sense Positive Input. Connect through an R-C filter
to the phase-side of the channel 3 inductor. When working at 2 phase,
directly connect to Vout_CORE.
See Section 9 for proper layout of this connection.
18
CS3-
Channel 3 Current Sense Negative Input. Connect through a RG resis-
tor to the output-side of the channel inductor. When working at 2 phase,
connect through RG to CS3+.
See Section 9 for proper layout of this connection.
Table 2.
Pin description (continued)
Pin#
Name
Function


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