L6727_10 datasheet(5/34 Pages) STMICROELECTRONICS

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L6727

Pins description and connection diagrams

Doc ID 12933 Rev 4

5/34

Pins description and connection diagrams

Figure 3.

Pins connection (top view)

2.1

Pin descriptions

Table 2.

Pins descriptions

VCC

COMP / DIS / OC

PHASE

LGATE

GND

UGATE

BOOT

L6727

Pin #

Name

Function

1BOOT

HS driver supply.

Connect through a capacitor (100 nF) to the floating node (LS-drain) pin

and provide necessary bootstrap diode from VCC.

UGATE

HS driver output. Connect to HS MOSFET gate.

3GND

All internal references, logic and drivers are connected to this pin.

Connect to the PCB ground plane.

LGATE

LS driver output. Connect to LS MOSFET gate.

5VCC

Device and LS driver power supply.

Operative range from 4.1 V to 13.2 V. Filter with at least 1

μF MLCC to GND.

6FB

Error Amplifier Inverting Input.

Connect with a resistor RFB to the output regulated voltage. Additional

resistor ROS to GND may be used to regulate voltages higher than the

reference.

COMP / DIS

/ OC

COMP. Error amplifier output. Connect with an RF - CF // CP to FB to

compensate the control-loop.

DIS. The device can be disabled by forcing this pin lower than 0.5V(typ). To

disable the device, the external pull-down need to overcome 10mA of

COMP output current for about 15

μs. Once disabled, COMP output current

drops to 20

μA.

OC. Over current threshold set. Connect with an ROCSET resistor to VCC

(ONLY IF VCC is supplied by 5 V bus) to program OC threshold. When

VCC > 5V, ROCSET need to be not-connected.

PHASE

HS driver return path, current-reading and adaptive-dead-time monitor.

Connect to the LS drain to sense RdsON drop to measure the output current.

This pin is also used by the adaptive-dead-time control circuitry to monitor

when HS MOSFET is OFF.

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