STBB3JCC datasheet(6/27 Pages) STMICROELECTRONICS

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Pin configuration

STBB3JCC

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DocID025425 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,

Output voltage.

SW1

D1, D2,

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

inductor between SW1 to SW2.

PGND

C1, C2,

Power ground.

SW2

B1, B2,

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

The MODE pin selects auto transition mode and fixed frequency PWM

mode. If the MODE pin is low, the STBB3JCC automatically switches

between pulse-skipping and standard fixed frequency PWM according

to the load level. If the MODE pin is pulled high, the STBB3JCC works

always at fixed frequency. MODE pin must be pulled high if the

STBB3JCC is used as HB WLED driver (constant current) for best

dynamic performance.

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,

Power input voltage.

GND

Signal ground.

Feedback voltage.

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