STBB1-AXX

Pin configuration

Doc ID 022197 Rev 2

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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-A automatically switches between pulse

skipping and fixed frequency PWM according to the load level.

If MODE pin is pulled high, the STBB1-A 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