LM3668_15 Datasheet, PDF (7/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

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LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
Typical Characteristics (continued)
Typical Application Circuit (see Figure 46): V_IN = 3.6 V, L = 2.2 µH, C_IN = 10 µF, C_OUT = 22 µF⁽⁴⁾, T_A = 25°C , unless otherwise
stated.
100
100
90
90
80
70
60
50
V_IN = 3.6V
40 _{VIN = 5.0V}
30
V_IN = 5.5V
20
V_IN = 2.5V
V_IN = 2.7V
80
70
V_IN = 2.5V
60
V_IN = 2.7V
50
40
V_IN = 5.5V
30
V_IN = 5.0V
20
10
0
0
1
10
100
1000
10
V_IN = 3.6V
0
0
1
10
100
1000
LOAD (mA)
LOAD (mA)
Figure 7. Efficiency at V_OUT = 2.8 V (Auto Mode)
Figure 8. Efficiency at V_OUT = 3 V (Forced PWM Mode)
100
90
80
70
V_IN = 2.5V
60
V_IN = 3.3V
50
V_IN = 2.7V
40
30
20
V_IN = 3.6V
10
V_IN = 5.5V
0
0
1
10
100
1000
Figure 9. Efficiency at V_OUT = 3 V (Auto Mode)
100
90
80
70
V_IN = 2.5V
60
V_IN = 3.3V
50
40 ^{VIN = 3.6V}
30 VIN = 5.5V
20
V_IN = 2.7V
10
0
0
1
10
100
1000
LOAD (mA)
Figure 10. Efficiency at V_OUT = 3.3 V (Forced PWM Mode)
100
90
80
70
V_IN = 2.5V
60
V_IN = 2.7V
50
40
30
V_IN = 5.0V
20
10
V_IN = 5.5V
0
V_IN = 3.6V
0
1
10
100
1000
LOAD (mA)
LOAD (mA)
Figure 11. Efficiency at V_OUT = 3.3 V (Auto Mode)
Figure 12. Efficiency at V_OUT = 3.4 V (Forced PWM Mode)
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