LM3668_15 Datasheet, PDF (11/30 Pages) Texas Instruments – 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

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LM3668
SNVS449O – JUNE 2007 – REVISED APRIL 2015
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.
Figure 31. Load Transient in Boost Mode (Forced PWM
Mode) V_IN = 3.5 V, V_OUT = 5 V, Load = 0 to 500 mA
Figure 32. Typical Switching Waveform in Boost Mode
(PWM Mode) V_IN = 2.7 V, V_OUT = 3 V, Load = 500 mA
2V/DIV
SW2
2V/DIV
SW1
Figure 33. Typical Switching Waveform in Buck Mode (PWM
Mode) V_IN = 3.6 V, V_OUT = 3 V, Load = 500 mA
5V/DIV
SW2
5V/DIV
SW1
50
mv/DIV
V_{OUT_AC}
500
mA/DIV
LOAD
5 2s/DIV
Figure 35. Typical Switching Waveform in Buck Mode (PFM
Mode) V_IN = 3.6 V, V_OUT = 3 V, Load = 50mA
50
mv/DIV
V_{OUT_AC}
500
mA/DIV
LOAD
5 2s/DIV
Figure 34. Typical Switching Waveformt in Boost Mode
(PFM Mode) V_IN = 2.7 V, V_OUT = 3 V, Load = 50 mA
5V/DIV
5V/DIV
50
mv/DIV
500
mA/DIV
SW2
SW1
V_{OUT_AC}
LOAD
200 ns/DIV
Figure 36. Typical Switching Waveform in Boost Mode
(PWM Mode) V_IN = 3 V, V_OUT = 3.4 V, Load = 500 mA
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