LM3668_15 Datasheet, PDF (12/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
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Typical Characteristics (continued)
Typical Application Circuit (see Figure 46): V_IN = 3.6 V, L = 2.2 µH, C_IN = 10 µF, C_OUT = 22 µF⁽⁴⁾, T_A = 25°C , unless otherwise
stated.
2V/DIV
SW2
2V/DIV
SW1
50
mv/DIV
V_{OUT_AC}
Figure 37. Typical Switching Waveform in Buck Mode (PWM
Mode) V_IN = 4 V, V_OUT = 3.4 V, Load = 500 mA
500
mA/DIV
LOAD
500 2s/DIV
Figure 38. Typical Switching Waveform in Boost Mode (PFM
Mode) V_IN = 3 V, V_OUT = 3.4 V, Load = 50 mA
5V/DIV
5V/DIV
50
mv/DIV
SW2
SW1
V_{OUT_AC}
500
mA/DIV
LOAD
500 2s/DIV
Figure 39. Typical Switching Waveform in Buck Mode (PFM Mode) V_IN = 4 V, V_OUT = 3.4 V, Load = 50 mA
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