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| LM3668_15 Datasheet, PDF (9/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter | |||
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www.ti.com
LM3668
SNVS449O â JUNE 2007 â REVISED APRIL 2015
Typical Characteristics (continued)
Typical Application Circuit (see Figure 46): VIN = 3.6 V, L = 2.2 µH, CIN = 10 µF, COUT = 22 µF(4), TA = 25°C , unless otherwise
stated.
3.4V
2.8V
VIN
4.0V
3.4V
VIN
100 mV/DIV
VOUT_AC
100 mV/DIV
VOUT_AC
5V/DIV
5V/DIV
SW2
SW1
5V/DIV
5V/DIV
SW2
SW1
100 2s/DIV
Figure 19. Line Transient in Boost Mode (VOUT = 3.4 V, Load
= 500 mA)
5V/DIV
SW2
100 2s/DIV
Figure 20. Line Transient in Buck-Boost Mode (VOUT = 3.4 V,
Load = 500 mA)
5V/DIV
SW2
5V/DIV
200
mv/DIV
SW1
VOUT_AC
5V/DIV
200 mV/DIV
SW1
VOUT_AC
500
mA/DIV
LOAD
100 2s/DIV
Figure 21. Load Transient in Buck Mode (Forced PWM
Mode) VIN = 4.2 V, VOUT = 3.4 V, Load = 0 to 500 mA
500 mA/DIV
LOAD
100 2s/DIV
Figure 22. Load Transient in Boost Operation (Forced PWM
Mode) VIN = 2.7 V, VOUT = 3.4 V, Load = 0 to 500 mA
Figure 23. Load Transient in Buck-Boost Operation (Forced
PWM Mode) VIN = 3.44 V, VOUT = 3.4 V, Load = 0 to 500 mA
Figure 24. Load Transient in Buck Mode (Forced PWM
Mode) VIN = 4.2 V, VOUT = 3 V, Load = 0 to 500 mA
Copyright © 2007â2015, Texas Instruments Incorporated
Product Folder Links: LM3668
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