L6983 datasheet(4/63 Pages) STMICROELECTRONICS

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Pin configuration

Figure 2. Pin connection (top through view)

E.P.

VIN

VINLDO

AGND

EN/CLKIN

VCC

AGND

BOOT

VIN

Table 1. Pin description

Symbol

Function

VIN

DC input voltage.

VINLDO

DC input voltage connected to the supply rail with a simple RC filter.

AGND

Analog ground.

EN / CLKIN

Enable pin with internal voltage divider. Pull-down/up to disable/

enable the device.

In LNM versions, this pin is also used to provide an external clock

signal, which synchronizes the device.

PGOOD

The PGOOD open collector output is driven to low impedance when

the output voltage is out of regulation and released once the output

voltage becomes valid.

VBIAS

Typically connected to the regulated output voltage, an external

voltage source can be used to supply part of the analog circuitry to

reduce current consumptions at light load. Connect it to AGND if not

used.

FB/VOUT

This pin operates as VOUT or FB according to the selected part

number. In fixed output voltage versions, VOUT is the output voltage

sensing with selected internal voltage divider.

In adjustable versions, FB is output voltage sensing with eternal

voltage divider.

FSW

Connect an external resistor to program the oscillator frequency and

enable the optional dithering.

VCC

This pin supplies the embedded analog circuitry. Connect a ceramic

capacitor (≥ 1 µF) to filter internal voltage reference.

AGND

Analog ground.

BOOT

Connect an external capacitor (100 nF typ.) between BOOT and SW

pins. The gate charge required to drive the internal NMOS is

refreshed during the low-side switch conduction time.

L6983

Pin configuration

DS13116 - Rev 1

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