LP3910 Datasheet, PDF (19/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

www.ti.com
7.21.3 Buck Characteristics
3.35
3.33
I_OUT = 20 mA
3.31
I_OUT = 600 mA
3.29
3.27
I_OUT = 300 mA
3.25
4.0 4.3 4.6 4.9 5.2 5.5
V_OUT = 3.3 V
SUPPLY VOLTAGE (V)
Figure 19. Output Voltage vs Supply Voltage
1.25
1.24
I_OUT = 600 mA
I_OUT = 300 mA
1.23
I_OUT = 20 mA
1.22
1.21
1.20
3.0 3.5 4.0 4.5 5.0 5.5
V_OUT = 1.2 V
SUPPLY VOLTAGE (V)
Figure 21. Output Voltage vs Supply Voltage
90
Vin = 3.2 V
80
Vin = 4 V
70
Vin = 5 V
60
50
40
30
20
10
0
0.1
V_OUT = 1.2 V
1.0
10
100
1000
OUTPUT CURRENT (mA)
L = 2.2 µH Forced PWM Mode
Figure 23. Buck1 Efficiency vs Output Current
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
2.05
2.04
I_OUT = 600 mA
I_OUT = 300 mA
2.03 ^IOUT ^{= 20 mA}
2.02
2.01
2.00
3.0 3.5 4.0 4.5 5.0 5.5
V_OUT = 2 V
SUPPLY VOLTAGE (V)
Figure 20. Output Voltage vs Supply Voltage
0.825
0.820
0.815
0.810
0.805
I_OUT = 600 mA
I_OUT = 300 mA
I_OUT = 20 mA
0.800
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
V_OUT = 0.8 V
Figure 22. Output Voltage vs Supply Voltage
100
Vin = 3.2 V
90
Vin = 4 V
80
70
Vin = 5 V
60
50
40
30
20
10
0
0.1
V_OUT = 2 V
1.0
10
100
1000
OUTPUT CURRENT (mA)
L = 2.2 µH
Forced PWM Mode
Figure 24. Buck 1 Efficiency vs Output Current
Copyright © 2006–2015, Texas Instruments Incorporated
Product Folder Links: LP3910
Submit Documentation Feedback
19