LM3668_15 Datasheet, PDF (8/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
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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
V_IN = 5V
90
90
80
70
60
V_IN = 5.0V
50
V_IN = 3.6V
40
30 ^{VIN = 5.5V}
20
V_IN = 2.5V
V_IN = 2.7V
80
70
60
V_IN = 2.7V
50
V_IN = 3.6V
40
30
V_IN = 5.5V
20
10
10
0
0
1
10
100
1000
0
0
1
10
100
1000
LOAD (mA)
LOAD (mA)
Figure 13. Efficiency at V_OUT = 3.4 V (Auto Mode)
100
90
80
70
60
50
V_IN = 5.5V
V_IN = 2.7V
40 ^VIN ^{= 3.6V} VIN = 5.0V
30
20
10
0
0
1
10
100
1000
Figure 14. Efficiency at V_OUT = 4.5 V (Forced PWM Mode)
100
V_IN = 5.5V
90
80
70
60
V_IN = 3.6V
50
40
V_IN = 2.7V
30
20
10
V_IN = 5.0V
0
0
1
10
100
1000
LOAD (mA)
LOAD (mA)
Figure 15. Efficiency at V_OUT = 4.5 V (Auto Mode)
100
90
80
70
V_IN = 3.6V
V_IN =5.0V
60
50
40
30 ^{VIN = 5.5V}
20
V_IN = 2.7V
10
0
0
1
10
100
1000
Figure 16. Efficiency at V_OUT = 5 V (Forced PWM Mode)
4.5V
3.7V
V_IN
100 mV/DIV
5V/DIV
V_{OUT_AC}
SW2
5V/DIV
SW1
LOAD (mA)
Figure 17. Efficiency at V_OUT = 5 V (Auto Mode)
100 2s/DIV
Figure 18. Line Transient in Buck Mode (V_OUT = 3.4 V, Load
= 500 mA)
8
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