STBB1-APUR Datasheet, PDF (5/22 Pages) STMicroelectronics – 1 A, high efficiency single inductor dual mode buck-boost DC-DC converter

STBB1-AXX
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-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
Supply voltage for control stage
Signal ground
Feedback voltage
Power ground
Doc ID 022197 Rev 2
5/22