STBB1XX

Pin configuration

Doc ID 15474 Rev 5

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3

Pin configuration

Figure 2.

Pin connections (top through view)

Table 4.

Pin description

Pin n°

Symbol

Name and function

1

VOUT

Output voltage

2SW2

Switch pin - Internal switches are connected to this pin. Connect inductor

between SW1 to SW2

3

PGND

Power ground

4SW1

Switch pin - Internal switches are connected to this pin. Connect inductor

between SW1 and SW2

5VIN

Power input voltage. Connect a ceramic bypass capacitor (10 µF minimum)

between this pin and PGND

6EN

Enable pin. Connect this pin to GND or a voltage lower than 0.4 V to shut down

the IC. A voltage higher than 1.2 V is required to enable the IC.

7

MODE

(SYNC)

Operation mode selection.

If MODE pin is low, the STBB1 automatically switches between pulse skipping

and fixed frequency PWM according to the load level.

If MODE pin is pulled high, the STBB1 works always in PWM mode.

When a square waveform is applied, this pin provides the clock signal for

oscillator synchronization

8

VINA

Supply voltage for control stage

9

GND

Signal ground

10

FB

Feedback voltage

Exposed pad

Power ground