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| NCP1422 Datasheet, PDF (7/14 Pages) ON Semiconductor – 800 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer | |||
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NCP1422
TYPICAL OPERATING CHARACTERISTICS
(VIN = 2.5 V, VOUT = 3.3 V, ILOAD = 50 mA; L = 5.6 mH)
Upper Trace: Output Voltage Ripple, 20 mV/Division
Lower Trace: Voltage at Lx pin, 1.0 V/Division
Figure 14. Discontinuous Conduction Mode
Switching Waveform
(VIN = 2.5 V, VOUT = 3.3 V, ILOAD = 500 mA; L = 5.6 mH)
Upper Trace: Output Voltage Ripple, 20 mV/Division
Lower Trace: Voltage at LX pin, 1.0 V/Division
Figure 15. Continuous Conduction Mode
Switching Waveform
(VIN = 1.5 V to 2.5 V; L = 5.6 mH, COUT = 22mF, ILOAD = 100 mA)
Upper Trace: Output Voltage Ripple, 100 mV/Division
Lower Trace: Battery Voltage, VIN, 1.0 V/Division
Figure 16. Line Transient Response for VOUT = 3.3 V
(VIN = 1.5 V to 2.5 V; L = 5.6 mH, COUT = 22mF, ILOAD = 100 mA)
Upper Trace: Output Voltage Ripple, 100 mV/Division
Lower Trace: Battery Voltage, VIN, 1.0 V/Division
Figure 17. Line Transient Response For VOUT = 5.0 V
(VOUT = 3.3 V, ILOAD = 100 mA to 800 mA; L = 5.6 mH, COUT = 22 mF)
Upper Trace: Output Voltage Ripple, 200 mV/Division
Lower Trace: Load Current, ILOAD, 500 mA/Division
Figure 18. Load Transient Response For VIN = 2.5 V
(VOUT = 5.0 V, ILOAD = 100 mA to 800 mA; L = 5.6 mH, COUT = 22 mF)
Upper Trace: Output Voltage Ripple, 500 mV/Division
Lower Trace: Load Current, ILOAD, 500 mA/Division
Figure 19. Load Transient Response For VIN = 3.0 V
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