LP3936 Datasheet, PDF (16/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
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BOOST CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS
V_IN = 3.6V, V_OUT = 4.55V if not otherwise stated.
Boost Converter Efficiency (R_OUT, G_OUT, B_OUT outputs)
94
Boost Frequency vs RT Resistor
100 mA
92
200 mA
90
88
300 mA
86
I _LOAD = 350 mA
84
82
80
3.00
3.50
4.00
4.50
INPUT VOLTAGE (V)
Figure 15.
Figure 16.
Battery Current vs Voltage
350
I_LOAD = 150 mA
300
250
Battery Current vs Voltage
650
I_LOAD = 300 mA
600
550
500
200
450
400
150
350
100
2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 5.8
BATTERY VOLTAGE (V)
Figure 17.
300
3.0
3.5
4.0
4.5
BATTERY VOLTAGE (V)
Figure 18.
Boost Typical Waveforms at 100 mA Load
Boost Startup with No Load
V_IN = 3.6V
4.5V ^{VOUT = 3.6V - 4.55V}
4.0V
3.5V
TIME (500 ns/DIV)
Figure 19.
TIME (50 Ps/DIV)
Figure 20.
16
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