A6727 datasheet(5/29 Pages) STMICROELECTRONICS

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A6727

Pin description and connection diagram

Figure 3. Pin connection (top view)

2.1

Pin description

Table 2. Pin description

VCC

COMP / DIS / OC

PHASE

LGATE

GND

UGATE

BOOT

A6727

AM16767v1

Pin #

Name

Function

BOOT

HS driver supply.

Connect through a capacitor (100

μF) to the floating node (LS drain) pin

and provide necessary bootstrap diode.

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 to the output regulated voltage through a resistor RFB. Additional

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

reference.

COMP / DIS

/ OC

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

compensate the control loop.

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

To disable the device, the external pull-down overcomes 10 mA of COMP

output current for about 15 ms. Once disabled, COMP output current drops

to 20 mA.

OC. Overcurrent threshold set. Connect to VCC through an ROCSET

resistor (only if VCC is supplied by 5 V bus) to program OC threshold.

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

PHASE

HS driver return path, current reading and adaptive deadtime monitor.

Connect to the LS drain to sense RDS(on) drop to measure the output

current. This pin is also used by the adaptive deadtime control circuitry to

monitor when HS MOSFET is off.

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