LP3958 Datasheet, PDF (10/36 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

LP3958
SNVS423C – JANUARY 2006 – REVISED MARCH 2013
0000 1100
12
0000 1101
13
0000 1110
14
0000 1111
15
0001 0000
16
0001 0001
17
0001 0010
18
12.0V
13.0V
14.0V
15.0V
16.0V
17.0V
18.0V
If register value is lower than 8, then value of 8 is used internally.
If register value is higher than 18, then value of 18 is used internally.
Boost Output Voltage Control
V_IN = 3.6 V
Control 8 V...18 V
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Figure 4.
Boost Converter Typical Performance Characteristics
Vin = 3.6V, Vout = 18.0V if not otherwise stated
Boost Converter Efficiency
92
91 ^ILOAD ^{= 70 mA}
90
50 mA
89
88
25 mA
87
3.0
L = Coilcraft LPS4018-103ML
3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 5.
Boost Typical Waveforms at 70mA Load
Figure 6.
10
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