LP3910 Datasheet, PDF (22/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
7.21.4 Buck-Boost Characteristics
100
95
90
85
V_OUT = 3.3 V
80
V_OUT = 1.8 V
75
70
65
60
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
I_LOAD= 100 mA
Figure 37. Efficiency vs VIN
100
V_IN = 4.2 V
90
80
V_IN = 2.7 V
70
V_IN = 3.3 V
60
50
0.1
V_OUT = 3.3 V
1
10
100
OUTPUT CURRENT (mA)
1000
Figure 39. Automode Efficiency vs I_LOAD
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100
80
60
V_BATT = 2.7 V
V_BATT = 3.3 V
40
V_BATT = 4.2 V
20
0
0.1
V_OUT = 3.3 V
1
10
100
OUTPUT CURRENT (mA)
1000
Figure 38. Forced PWM Efficiency vs I_LOAD
100
V_IN = 2.7 V
90
80
V_IN = 3.6 V
70
V_IN = 4.2 V
60
50
0.1
V_OUT = 1.8 V
1
10
100
OUTPUT CURRENT (mA)
1000
Figure 40. Automode Efficiency vs I_LOAD
V_IN = 4.2 V
V_OUT = 3.3 V
I_LOAD = 250 mA
Figure 41. Switch Pins in Buck Mode Operation
V_IN = 3.6 V
V_OUT = 3.3 V
I_LOAD = 250 mA
Figure 42. Switch Pin on Edge of Buck Mode Operation
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