LP3910 Datasheet, PDF (67/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

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9.2.3 Application Curves
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
Ch1 = Charge Current (mA)
Ch3 = CHG_DET (V)
Ch4 = USBPWR (V)
Figure 77. Wall Adapter Removal With USBPWR Present
V_IN = 0 to 3.6 V
V_OUT = 1.8 V
Load = 1 mA
Figure 79. Enable Start-Up Time (LDO2)
100
Vin = 3.6 V
90
Vin = 4 V
80
70
Vin = 5 V
60
50
40
30
20
10
0
0.1
V_OUT = 3.3 V
1.0
10
100
1000
OUTPUT CURRENT (mA)
L = 2.2 µH Forced PWM Mode
Figure 81. Buck2 Efficiency vs Output Current
V_IN = 0 to 3.6 V
V_OUT = 3.3 V
Load = 1 mA
Figure 78. Enable Startup Time (LDO1)
90
Vin = 3.6 V
80
Vin = 4 V
70
Vin = 5 V
60
50
40
30
20
10
0
0.1
V_OUT = 1.8 V
1.0
10
100
1000
OUTPUT CURRENT (mA)
L = 2.2 µH Forced PWM Mode
Figure 80. Buck2 Efficiency vs Output Current
95
Vin = 3.6 V
90
Vin = 4 V
85 _{Vin = 5 V}
80
75
70
65
60
55
50
0.1
V_OUT = 1.8 V
1.0
10
100
1000
OUTPUT CURRENT (mA)
L = 2.2 µH PFM-to-PWM Mode
Figure 82. Buck2 Efficiency vs Output Current
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