2

Pin description and connection diagram

Figure 3. Pin connection (top view)

1

2

3

4

VCC

FB

COMP / DIS / OC

PHASE

LGATE

GND

UGATE

BOOT

5

6

7

8

A6727B

Table 1. Pin description

Pin n°

Symbol

Function

1

BOOT

HS driver supply. Connect through a capacitor (100 nF) to the floating node (LS drain) pin and provide

necessary bootstrap diode.

2

UGATE

HS driver output. Connect to HS MOSFET gate.

3

GND

All internal references, logic and drivers are connected to this pin. Connect to the PCB ground plane.

4

LGATE

LS driver output. Connect to LS MOSFET gate.

5

VCC

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.

6

FB

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.

7

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 0.1 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.

8

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.

2.1

Thermal data

Table 2. Thermal data

Symbol

Parameter

Value

Unit

Rth(JA)

Thermal resistance junction-to-ambient (1)

85

°C/W

TMAX

Maximum junction temperature

150

°C

TSTG

Storage temperature range

-40 to 150

°C

TJ

Junction temperature range

-40 to 150

°C

1. The component is mounted on a 2S2P board in free air (6.7 cm x 6.7 cm, 35 μm (P) and 17.5 μm (S) copper thickness).

A6727B

Pin description and connection diagram

DS14159 - Rev 2

page 3/26