LP3906SQ-JXXI Datasheet, PDF (13/47 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C ompatible

LP3906
www.ti.com
SNVS456M – AUGUST 2006 – REVISED MAY 2013
TYPICAL PERFORMANCE CHARACTERISTICS — BUCK (continued)
T_A = 25°C unless otherwise noted
Buck 1 Efficiency
vs
Output Current
(PFM to PWM mode, Vout =1.2V, L= 2.2µH)
100
V_IN = 2.8V
90
Buck 1 Efficiency
vs
Output Current
(PFM to PWM mode, Vout =2.0V, L= 2.2µH)
100
V_IN = 2.8V
90
80
70
V_IN = 5.5V
V_IN = 3.6V
60
80
V_IN = 5.5V
70
V_IN = 3.6V
60
50
50
40
40
30
10^-3 10^-2 10^-1 10 ⁰ 10 ¹ 10 ² 10 ³ 10 ⁴
30
10^-2 10^-1 10⁰ 10¹ 10² 10³ 10⁴
OUTPUT CURRENT (mA)
Figure 18.
OUTPUT CURRENT (mA)
Figure 19.
Buck 2 Efficiency
vs
Output Current
(Forced PWM Mode, Vout =1.8V, L= 2.2µH)
100
90
80
V_IN = 4.3V
70
V_IN = 5.5V
60
50
40
30
20
10
0
10^-2 10^-1 10⁰ 10¹ 10² 10³ 10⁴
OUTPUT CURRENT (mA)
Figure 20.
Buck 2 Efficiency
vs
Output Current
(Forced PWM Mode, Vout =3.3V, L= 2.2µH)
100
90
V_IN = 4.3V
80
70
V_IN = 5.5V
60
50
40
30
20
10
0
10^-2 10^-1 10⁰ 10¹ 10² 10³ 10⁴
OUTPUT CURRENT (mA)
Figure 21.
Buck 2 Efficiency
vs
Output Current
(PFM to PWM Mode, Vout =1.8V, L= 2.2µH)
100
V_IN = 4.3V
90
80
V_IN = 5.5V
70
Buck 2 Efficiency
vs
Output Current
(PFM to PWM Mode, Vout =3.3V, L= 2.2µH)
100
V_IN = 4.3V
90
80
V_IN = 5.5V
70
60
60
50
50
40
10^-2 10^-1 10⁰ 10¹ 10² 10³ 10⁴
OUTPUT CURRENT (mA)
Figure 22.
40
10^-2 10^-1 10⁰ 10¹ 10² 10³ 10⁴
OUTPUT CURRENT (mA)
Figure 23.
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