STBB3J Datasheet, PDF (6/25 Pages) STMicroelectronics – 2 A, high efficiency single inductor buck-boost DC-DC converter

Pin configuration
3
Pin configuration
Figure 3. Pin connection top view
STBB3J
Figure 4. Pin connection bottom view
AM16823v1
AM16824v1
Table 3. Pin description
Pin name
Pin
Description
VOUT
SW1
PGND
SW2
A1, A2, A3 Output voltage.
D1, D2, D3
Switch pin - internal switches are connected to this pin. Connect
inductor between SW1 to SW2.
C1, C2, C3 Power ground.
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
EN
E4
shut down the IC. A voltage higher than 1.2 V is required to enable
the IC.
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
MODE/SYNC
D4
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
C4
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
B4
Signal ground.
FB
A4
Feedback voltage.
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