STBB1-AXX STMicroelectronics, STBB1-AXX Datasheet - Page 12

• 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%

Typical performance characteristics
7
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Figure 5.
Figure 7.
Figure 9.
100
100
1200
1200
1100
1100
1000
1000
90
90
80
80
70
70
60
60
50
50
900
900
800
800
700
700
600
600
500
500
400
400
300
300
200
200
100
100
90
90
80
80
70
70
60
60
50
50
1
1
2.00
2.00
2
2
Typical performance characteristics
L = 2.2 µH, V
components listed in
Efficiency vs. I
Efficiency vs. V
Max I
2.50
2.50
2.5
2.5
3.00
3.00
OUT
10
10
3
3
Output Current [mA]
Output Current [mA]
Input Voltage [V]
Input Voltage [V]
vs. V
3.50
3.50
Input Voltage
Input Voltage
3.5
3.5
O
V
V
V
V
V
V
O
O
O
O
O
O
= 3.3 V, all measurements done with circuit shown in
= 2.5 V
= 2.5 V
= 5.0 V
= 5.0 V
= 3.3 V
= 3.3 V
V
V
V
V
V
V
OUT
IN
4.00
4.00
IN
IN
IN
IN
IN
IN
IN
= 3.6 V
= 3.6 V
= 2.2 V
= 2.2 V
= 5.0 V
= 5.0 V
4
4
, I
100
100
in auto mode
OUT
Table
4.50
4.50
4.5
4.5
= 500 mA
V
V
V
V
V
V
O
O
O
O
O
O
5.00
5.00
5.
= 2.5 V
= 2.5 V
= 3.3 V
= 3.3 V
= 5.0 V
= 5.0 V
5
5
Doc ID 022197 Rev 2
5.50
5.50
1000
1000
5.5
5.5
Figure 6.
Figure 8.
Figure 10. Boost region operation
V
AC Coupled
IN
70 mV/div
0.2 A/div
3 V/div
3 V/div
SW1
SW2
= 2.5 V V
V
I
L
O
100
100
800
700
600
500
400
300
200
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
2.1 2.4 2.7
1
1
O
= 3.3 V I
Efficiency vs. I
PS to PWM transition
3
O
= 50 mA, pulse skipping
Output Current [mA]
Output Current [mA]
10
10
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
TIMEBASE: 2 µs/div
VIN [V]
Figure 3
OUT
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
= 3.6 V
= 3.6 V
= 5.0 V
= 5.0 V
= 2.2 V
= 2.2 V
100
100
in PWM mode
and external
STBB1-AXX
1000
1000