STBB1PUR Datasheet, PDF (5/21 Pages) STMicroelectronics – 1 A, high efficiency single inductor

STBB1XX
3
Pin configuration
Figure 2. Pin connections (top through view)
Pin configuration
Table 4.
Pin n°
1
2
3
4
5
6
7
8
9
10
Pin description
Symbol
VOUT
SW2
PGND
SW1
VIN
EN
MODE
(SYNC)
VINA
GND
FB
Exposed pad
Name and function
Output voltage
Switch pin - Internal switches are connected to this pin. Connect inductor
between SW1 to SW2
Power ground
Switch pin - Internal switches are connected to this pin. Connect inductor
between SW1 and SW2
Power input voltage. Connect a ceramic bypass capacitor (10 µF minimum)
between this pin and PGND
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.
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
Supply voltage for control stage
Signal ground
Feedback voltage
Power ground
Doc ID 15474 Rev 5
5/21