AN4086 Datasheet, PDF (8/11 Pages) STMicroelectronics – Buck voltage regulator using the PM8903

Circuit description
Figure 5. Startup
Figure 6. V_OUT, V_IN, I_IN ripple
AN4086
Ch 1: Output voltage
Ch 2: Power Good
Ch 3: Input voltage
Ch 4: Enable
Figure 7. Transient load (0 A to 1.5 A)
Ch 1: Output voltage ripple
Ch 2: Switch node
Ch 3: Input voltage ripple
Ch 4: Input current ripple
Figure 8. Transient load (1.5 A to 3 A)
Ch 1: Output voltage (off)
Ch 4: Output current
Figure 9. Duty cycle jitter at 3 A load
Ch 1: Output voltage (off)
Ch 4: Output current
Figure 10. V_OUT, V_IN, I_IN ripple
Ch 3: Switch node (persistence mode)
Ch 1: Power Good
Ch 2: Output voltage
Ch 3: Feedback
Ch 4: Switch node
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Doc ID 023053 Rev 1