STBB1-AXX Datasheet, PDF (7/24 Pages) STMicroelectronics – Buck-boost DC-DC converter

STBB1-AXX
3
Pin configuration
Figure 2: Pin connection (top view)
Pin configuration
Pin
Symbol
Table 4: Pin description
Name and function
1
VOUT
Output voltage
2
SW2
Switch pin. Internal switches are connected to this pin. Connect
inductor between SW1 to SW2
3
PGND
Power ground
4
SW1
Switch pin. Internal switches are connected to this pin. Connect
inductor between SW1 and SW2
5
VIN
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
6
EN
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-AXX
automatically switches between pulse skipping and fixed frequency
7
MODE (SYNC)
PWM according to the load level. If MODE pin is pulled high, the
STBB1-AXX works in PWM mode. When a square waveform is
applied, this pin provides the clock signal for oscillator
synchronization
8
VINA
Supply voltage for control stage
9
GND
Signal ground
10
FB
Feedback voltage
Exposed pad Power ground
DocID022197 Rev 4
7/24