STBB1-AXX STMicroelectronics, STBB1-AXX Datasheet - Page 5

• Manufacturer Part Number: STBB1-AXX
• Description: 1 A, high efficiency single inductor dual mode buck-boost DC-DC converter
• Manufacturer: STMicroelectronics

Specifications of STBB1-AXX

• Typical Efficiency: > 94%

STBB1-AXX
3
Figure 2.
Table 4.
Pin n°
10
1
2
3
4
5
6
7
8
9
Pin configuration
Pin connections (top through view)
Pin description
Exposed pad
Symbol
(SYNC)
MODE
PGND
VOUT
VINA
SW2
SW1
GND
VIN
EN
FB
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
Name and function
Pin configuration
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