L6758A Datasheet, PDF (7/42 Pages) STMicroelectronics – DPM - dynamic phase management

L6758A
Pin# Name
7
REF
8
GDC
9 VCC12
10 SVCLK
11 ALERT#
12 SVDATA
13 EN_VTT
SPWM /
14
SEN
15 VR_HOT
16 SCSP
17 SCSN
18 SIMON
19 SRGND
20 SVSEN
21 SFB
Pin description and connection diagrams
Table 2. Pin description (continued)
Function
The reference used for the regulation of the multi-phase section is
available on this pin with -100 mV offset. Connect through an R_REF-C_REF
to RGND to optimize DVID transitions. Connect through an R_OS resistor to
FB pin to implement small positive offset to the regulation.
Gate drive control pin.
Used for efficiency optimization, see Section 9 for details. If not used, it
can be left floating.
+12 V bus monitor to synchronize startup.
The IC waits for the 12 V to become available before implementing soft-
start when enabled. Connect directly to the +12 V bus (i.e. the high-side
MOSFET drain).
Serial clock.
Alert.
Serial data.
VTT level sensitive enable pin (3.3 V compatible).
Pull low to disable the device, pull up above the turn-on threshold to
enable the controller.
PWM output.
Connect to external driver PWM input. During normal operation the device
is able to manage HiZ status by setting and holding the pin to a fixed
voltage defined by PWMx strapping. Connect to VCC5 with 1 kΩ to
disable single-phase section.
Voltage regulator HOT.
Open drain output; this is an alarm signal asserted by the controller when
the temperature sensed through the TM and or ST pins exceed TMAX
(active low). See Section 8 for details.
Single-phase section current sense positive input.
Connect through an R-C filter to the phase-side of the channel 1 inductor.
Single-phase section current sense negative input.
Connect through an Rg resistor to the output-side of the channel inductor.
Filter the output-side of Rg with 100 nF (typ.) to GND.
Current monitor output.
A current proportional to the single-phase current is sourced from this pin.
Connect through a resistor R_SIMON to local GND. When the pin voltage
reaches 1.55 V, overcurrent protection is set and the IC latches. Filtering
through C_SIMON to GND allows to control the delay for OC intervention.
Remote ground sense.
Connect to the negative side of the load to perform remote sense.
Output voltage monitor, manages OV and UV protection. Connect to the
positive side of the load to perform remote sense.
Error amplifier inverting input.
Connect with a resistor R_SFB to SVSEN and with an (R_SF - C_SF)// C_SP to
SCOMP.
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