L6759D datasheet(9/51 Pages) STMICROELECTRONICS

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L6759D

Pin description and connection diagrams

Doc ID 023240 Rev 1

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Pin description and connection diagrams

Figure 4.

Pin connection (top view)

2.1

Pin description

36 35 34 33 32 31 302928 27 26 25

4567

910 11 12

SPWM

VR_HOT

TCOMP

SCSP

ILIM

SRGND

SFBR

SVSEN

SFB

SCOMP

SCSN

ENDRV

SVR_RDY

IMON

REF

RGND

LTB

FBR

VSEN

COMP

VDRV

GDC

L6759D

Table 2.

Pin description

Pin#

Name

Function

1 to 3

PWM3 to

PWM1

PWM outputs.

Connect to multi-phase external drivers PWM input. These pins are also

used to configure HiZ levels for compatibility with drivers and DrMOS.

During normal operations the device is able to manage the HiZ status

by setting and holding the PWMx pin to a pre-defined fixed voltage.

Connect PWM3 to 5 V through 1 kW resistor to program 2-phase opera-

tion.

PHASE

Connect through resistor divider to Channel1 multi-phase switching

node.

VR_RDY

VR ready. Open drain output set free after SS has finished in multi-

phase and pulled low when triggering any protection on the multi-phase

section. Pull up to a voltage lower than 3.3 V (typ.), if not used it can be

left floating.

6CS3P

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,

short to the regulated voltage.

7CS3N

Channel 3 current sense negative input. Connect through an Rg resistor

to the output-side of the channel inductor. When working at 2-phase,

still connect through Rg to CS3P and then to the regulated voltage. Fil-

ter the output-side of Rg with 100 nF (typ.) to GND.

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