Pin settings

L6984

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DocID025378 Rev 3

1

Pin settings

1.1

Pin connection

Figure 2. Pin connection (top view)

1.2

Pin description

Table 1. Pin description

No.

Pin

Description

1

PGOOD

(see Table 5).

2

FB

Inverting input of the error amplifier

3

TON

4EN

used.

5

GND

Power GND

6

LX

Switching node

7

VIN

DC input voltage

8VCC

Embedded regulator output that supplies the main switching controller.

Connect an external 1

F capacitor for proper operation.

An integrated LDO regulates VCC = 3.3 V if VBIAS voltage is < 2.4 V.

VCC is connected to VBIAS through a MOSFET switch if VBIAS > 3.2 V and the embedded

LDO is disabled to increase the light load efficiency.

9

VBIAS

Typically connected to the regulated output voltage. An external voltage reference can be

used to supply the analog circuitry to increase the efficiency at light load. Connect to GND if

not used.

10

LNM

operation.