Pin configuration

STBB2

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DocID022745 Rev 9

4

Pin configuration

Figure 5. Pin connections (top view)

A4

[EN]

B4

[BP]

C4

[MODE]

D4

[VSEL]

A3

[VINA]

B3

[VINA1]

C3

[GND]

D3

[GND]

A2

[VIN]

B2

[SW1]

C2

[PGND]

D2

[SW2]

A1

[VIN]

B1

[SW1]

C1

[PGND]

D1

[SW2]

E4

[GND]

E3

[FB]

E2

[VO]

E1

[VO]

A4

[EN]

B4

[BP]

C4

[MODE]

D4

[VSEL]

A3

[VINA]

B3

[VINA1]

C3

[GND]

D3

[GND]

A2

[VIN]

B2

[SW1]

C2

[PGND]

D2

[SW2]

A1

[VIN]

B1

[SW1]

C1

[PGND]

D1

[SW2]

E4

[GND]

E3

[FB]

E2

[VO]

E1

[VO]

A4

[EN]

B4

[BP]

C4

[MODE]

D4

[VSEL]

A3

[VINA]

B3

[VINA1]

C3

[GND]

D3

[GND]

A2

[VIN]

B2

[SW1]

C2

[PGND]

D2

[SW2]

A1

[VIN]

B1

[SW1]

C1

[PGND]

D1

[SW2]

E4

[GND]

E3

[FB]

E2

[VO]

E1

[VO]

Top view

Bottom view

Table 5. Pin description

Pin name

Pin n°

Description

VOUT

E1, E2

Output voltage.

SW2

D1, D2

Switch pin - internal switches C and D are connected to this pin. Connect inductor

between SW1 to SW2.

PGND

C1, C2

Power ground.

SW1

B1, B2

Switch pin - internal switches A and B are connected to this pin. Connect inductor

between SW1 and SW2.

EN

A4

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. Do not leave this pin floating.

MODE

C4

When in normal operation, the MODE pin selects between auto mode and forced PWM

mode. If the MODE pin is low, the STBB2 automatically switches between pulse-skipping

and standard PWM according to the load level. If the MODE pin is pulled high, the STBB2

always works in PWM mode. Do not leave this pin floating.

VINA

A3

Supply voltage for control stage.

VINA1

B3

A 100

Ω resistor is internally connected between VIN and VINA1. Connecting a 1 µF

capacitor between VINA1 and GND.

VIN

A1, A2

Power input voltage. Connect a ceramic bypass capacitor (10 µF min.) between this pin

and PGND.

GND

C3, D3, E4 Signal ground.

FB

E3