L5973AD

2/14

Table 2. Thermal Data

(*) Package mounted on board

Figure 3. Pin Connection (top view)

Table 3. Pin Description

Table 4. Absolute Maximum Ratings

Symbol

Parameter

Value

Unit

Thermal Resistance Junction to ambient

Max.

40 (*)

°C/W

N.

Name

Description

1

OUT

Regulator Output.

2

SYNC

Master/Slave Synchronization. When it is open, a signal synchronous with the turn-off of the inter-

nal 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.

3INH

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

5

FB

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

voltage of 1.235V. An external resistor divider is required for higher output voltages (the typical

value for the resistor connected between this pin and ground is 4.7K).

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

7

GND

Ground.

Unregulated DC input voltage.

Symbol

Parameter

Value

Unit

Input Voltage

40

V

Output DC voltage

Output peak voltage at t = 0.1

µs

-1 to 40

-5 to 40

V

V

Maximum output current

int. limit.

Analog pins

4

V

INH

SYNC

-0.3 to 4

V

≤ 60°C

2.25

W

Operating junction temperature range

-40 to 150

°C

Storage temperature range

-55 to 150

°C

OUT

SYNC

INH

COMP

1

3

2

4

VCC

VREF

GND

FB

8

7

6

5

D98IN955