L5973AD Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L5973AD

2 A switch step down switching regulator

STMicroelectronics 

L5973AD

1

Pin settings

1.1

Pin connection

Figure 2. Pin connection (top view)

OUT

SYNC

INH

COMP

1

8

2

7

3

6

4

5

D98IN955

VCC

GND

VREF

FB

Pin settings

1.2

Pin description

Table 1. Pin description

N°

Type

Description

1

OUT Regulator output.

Master/Slave Synchronization. When it is open, a signal synchronous with the

turn-off of the internal power is present at the pin. When connected to an

2

SYNC

external signal at a frequency higher than the internal one, then the device is

synchronized by the external signal.

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

frequency works as master and the other one, works as slave.

A logical signal (active high) disables the device. With IHN higher than 2.2 V

3

INH

the device is OFF and with INH lower than 0.8V, the device is ON.

If INH is not used the pin must be grounded. When it is open, an internal pull-

up disables the device.

4

COMP E/A output to be used for frequency compensation.

Stepdown feedback input. Connecting the output voltage directly to this pin

5

FB

results in an output voltage of 1.235 V. An external resistor divider is required

for higher output voltages (the typical value for the resistor connected

between this pin and ground is 4.7 K).

6

VREF Reference voltage of 3.3 V. No filter capacitor is needed to stability.

7

GND Ground.

8

VCC Unregulated DC input voltage.

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