STBB1-AXX STMicroelectronics, STBB1-AXX Datasheet - Page 13

• 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
Figure 11. Boost region operation
V
Figure 13. Buck-boost region operation
V
Figure 15. Buck region operation
V
AC Coupled
AC Coupled
AC Coupled
300 mV/div
IN
IN
IN
20 mV/div
30 mV/div
0.2 A/div
0.3 A/div
0.4 A/div
3 V/div
3 V/div
3 V/div
3 V/div
3 V/div
3 V/div
SW1
SW2
SW1
SW2
SW1
SW2
= 3.6 V V
V
= 2.5 V V
V
= 4.2 V V
V
I
I
I
L
O
L
L
O
O
O
O
O
= 3.3 V I
= 3.3 V I
= 3.3 V I
O
O
O
= 200 mA, PWM mode
= 500 mA, PWM mode
= 100 mA, pulse skipping mode
TIMEBASE: 0.5µs/div
TIMEBASE: 0.5 µs/div
TIMEBASE: 2 µs/div
Doc ID 022197 Rev 2
Figure 12. Buck-boost region operation
V
Figure 14. Buck-boost region operation
V
Figure 16. Buck region operation
V
AC Coupled
100 mV/div
AC Coupled
AC Coupled
IN
IN
IN
20 mV/div
0.2 A/div
20 mV/div
0.1 A/div
0.4 A/div
3 V/div
3 V/div
3 V/div
3 V/div
3 V/div
3 V/div
SW1
SW2
SW1
SW2
SW1
SW2
V
= 3.6 V V
= 3.6 V V
= 4.2 V V
I
V
V
L
I
I
O
L
O
L
O
O
O
O
= 3.3 V I
= 3.3 V I
= 3.3 V I
Typical performance characteristics
O
O
O
= 100 mA, pulse skipping mode
= 50 mA, PWM mode
= 500 mA, PWM mode
TIMEBASE: 0.2 µs/div
TIMEBASE: 1 µs/div
TIMEBASE: 1µs/div
13/22