The graphs show typical electrical characteristics for BOOST when supplied by an alkaline AA battery. They have been measured using a 2.2 µH Taiyo Yuden inductor (LSCNB1608HKT2R2MD), CVBAT=10 µF, CVINT=22 µF, and CVOUT=2.2 µF, unless mentioned otherwise.

The following three figures show efficiency in Auto mode for various output voltages.

Figure 1. Efficiency, VOUT=1.8 V


Figure 2. Efficiency, VOUT=3.3 V


Figure 3. Efficiency, VOUT=3.3 V


The following figure shows the typical load current threshold in Auto mode where BOOST changes from Low Power to High Power mode.

Figure 4. Load current triggering mode change vs. VOUT


The following two figures show device startup at various VSET configurations when an alkaline AA battery is inserted.

Figure 5. Battery insertion, VSET not connected


Figure 6. Battery insertion, VSET connected to ground


The following two figures show load regulation in High Power mode for various output voltages.

Figure 7. Load regulation, VOUT=1.8 V (VBAT=1.5 V)


Figure 8. Load regulation, VOUT=3.0 V (VBAT=2.5 V)


The following two figures show load regulation in Auto mode for various output voltages.

Figure 9. Load regulation, VOUT=1.8 V (VBAT=1.5 V)


Figure 10. Load regulation, VOUT=3.0 V (VBAT=2.5 V)


The following two figures show load transient in Auto mode (automatic mode change from Low Power mode to High Power mode, and back) when supplied by an alkaline AA battery. Load changes from 1 mA to 100 mA in 10 μs.

Figure 11. Load transient, VOUT=1.8 V


Figure 12. Load transient, VOUT=3.0 V


The following two figures show load transient in Low Power mode when supplied by an alkaline AA battery. Load changes from 1 mA to 100 mA in 10 μs.

Figure 13. Load transient, VOUT=1.8 V


Figure 14. Load transient, VOUT=3.0 V


The following figure shows mode change from Low Power to High Power mode using GPIO control when supplied by an alkaline AA battery. Load is 10 mA.

Figure 15. Mode change, VOUT=1.8 V


The following two figures show output voltage programming via TWI from 1.8 V to 2.5 V in various modes without load when supplied by an alkaline AA battery (LDOSW is in High Power mode, no load).

Figure 16. Output voltage programming, Auto mode


Figure 17. Output voltage programming, Low Power mode


The following figure shows output voltage programming via TWI from 2.5 V to 1.8 V in Low Power mode without load when supplied by an alkaline AA battery (LDOSW is in High Power mode, no load).

Figure 18. Output voltage programming downwards


The following two figures show switching waveforms in various modes when VOUT=3.0 V when supplied by an alkaline AA battery.

Figure 19. Switching waveforms in High Power mode, load=50 mA


Figure 20. Switching waveforms in Low Power mode (load=30 mA)


The following figure shows switching waveforms when VOUT=1.8 V and load=10 mA when supplied by an alkaline AA battery.

Figure 21. Switching waveforms in Ultra-Low Power mode


The following figure shows VOUT ripple frequency vs. load in Low Power mode.

Figure 22. Ripple frequency vs. load current (VBAT=1.5 V)


The following two figures show alkaline AA battery removal for various output voltages (LDOSW in High Power mode, no load).

Figure 23. Battery removal, VOUT=1.8 V


Figure 24. Battery removal, VOUT=3.0 V