STBB1XX Datasheet, PDF (11/20 Pages) STMicroelectronics – Buck-boost DC-DC converter

STBB1xx
Typical performance characteristics
7
Typical performance characteristics
Figure 5.
(L = 2.2 µH, V_O = 3.3 V, all the measurements done with circuit shown in Figure 3 and
external components listed in Table 5)
Efficiency vs I_OUT in auto mode
Figure 6. Efficiency vs I_OUT in PWM mode
100
100
90
90
80
70
80
60
50
70
60
V_O = 3.3 V
50
1
V_IN = 3.6 V
V_IN = 2.2 V
V_IN = 5.0 V
10
100
Output Current [mA]
1000
40
30
20
10
0
1
V_IN = 3.6 V
V_IN = 5.0 V
V_IN = 2.2 V
10
100
Output Current [mA]
1000
Figure 7. Efficiency vs V_IN, I_OUT = 550 mA
100
Figure 8. PS to PWM transition
800
700
90
600
80
500
70
60
I_O = 550 mA
V_O = 2.5 V
V_O = 5.0 V
V_O = 3.3 V
50
2
2.5
3
3.5
4
4.5
5
5.5
Output Current [mA]
400
300
200
100
2.1 2.4 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
VIN [V]
Figure 9.
1200
1100
1000
900
800
700
600
500
400
300
200
2
Max I_OUT vs V_IN
V_O = 2.5 V
V_O = 3.3 V
V_O = 5.0 V
2.5
3
3.5
4
4.5
5
5.5
Input Voltage
Figure 10. Boost region operation
SW1
3 V/div
SW2
3 V/div
I_L
0.2 A/div
V_O
70 mV/div
AC Coupled
TIMEBASE: 2 µs/div
V_IN = 2.5 V V_O = 3.3 V I_O = 50 mA, pulse skipping
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