L5985 datasheet(3/37 Pages) STMICROELECTRONICS

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L5985

Pin settings

3/37

Pin settings

1.1

Pin connection

Figure 2.

Pin connection (top view)

1.2

Pin description

OUT

SYNCH

INH

COMP

GND

FSW

OUT

SYNCH

INH

COMP

GND

FSW

Table 1.

Pin description

Type

Description

OUT

Regulator output

SYNCH

Master/slave synchronization. When it is left floating, a signal with a

phase shift of half a period respect to the power turn on is present at the

pin. When connected to an external signal at a frequency higher than the

internal one, then the device is synchronized by the external signal, with

zero phase shift.

Connecting together the SYNCH pin of two devices, the one with higher

frequency works as master and the other one as slave; so the two power

turn on have a phase shift of half a period.

3INH

A logical signal (active high) disable the device. With INH higher than

1.9 V the device is OFF and with INH lower than 0.6 V the device is ON.

COMP

Error amplifier output to be used for loop frequency compensation

5FB

Feedback input. Connecting the output voltage directly to this pin the

output voltage is regulated at 0.6 V. To have higher regulated voltages an

external resistor divider is required from Vout to FB pin.

6FSW

The switching frequency can be increased connecting an extrenal

resistor from FSW pin and ground. If this pin is left floating the deice

works at its free-running frequency of 250 kHz.

GND

Ground

8VCC

Unregulated DC input voltage

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