E-L5973AD Datasheet, PDF (3/22 Pages) STMicroelectronics – 2 A switch step down switching regulator

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.
N°
1
2
3
4
5
6
7
8
Pin description
Type
Description
OUT Regulator output.
SYNC
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
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
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.
COMP E/A output to be used for frequency compensation.
Stepdown feedback input. Connecting the output voltage directly to this pin
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).
VREF Reference voltage of 3.3 V. No filter capacitor is needed to stability.
GND Ground.
VCC Unregulated DC input voltage.
Doc ID 9552 Rev 9
3/22