STBB3J datasheet(6/25 Pages) STMICROELECTRONICS

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Pin configuration

STBB3J

6/25

DocID025263 Rev 5

Pin configuration

Figure 3. Pin connection top view

Figure 4. Pin connection bottom view

AM16823v1

AM16824v1

Table 3. Pin description

Pin name

Description

VOUT

A1, A2, A3

Output voltage.

SW1

D1, D2, D3

Switch pin - internal switches are connected to this pin. Connect

inductor between SW1 to SW2.

PGND

C1, C2, C3

Power ground.

SW2

B1, B2, B3

Switch pin - internal switches are connected to this pin. Connect

inductor between SW1 and SW2.

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.

MODE/SYNC

When in normal operation, the MODE pin selects between auto

transition mode and fixed frequency PWM mode. If the MODE pin is

low, the STBB3J automatically switches between pulse-skipping and

standard fixed frequency PWM according to the load level. If the

MODE pin is pulled high, the STBB3J works always at fixed

frequency. When a square wave is applied, this pin provides the

clock signal for oscillator synchronization.

VIN_A

Supply voltage for control stage. Connecting a capacitor of minimum

100 nF between VIN_A and GND.

VIN_SW

E1, E2, E3

Power input voltage.

GND

Signal ground.

Feedback voltage.

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