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Typical Performance Characteristics

7

Typical Performance Characteristics

VIN = 12V, VOUT = 3.3V, IOUT = 200 mA

Top Trace: VOUT, 10 mV/div, AC Coupled

Bottom Trace: SW, 5V/div, DC Coupled

T = 1 µs/div

Figure 2. Efficiency vs. Load Current

Figure 3. Switching Node and Output Voltage

Waveforms

VIN = 12V, VOUT = 3.3V, IOUT = 200 mA to 300 mA

VIN = 12V, VOUT = 3.3V, IOUT = 50 mA

Top Trace: VOUT, 20 mV/div, AC Coupled

Top Trace: VOUT, 1V/div, DC Coupled

Bottom Trace: IOUT, 100 mA/div, DC Coupled

Bottom Trace: SHDN, 2V/div, DC Coupled

T = 200 µs/div

T = 40 µs/div

Figure 4. Load Transient Waveforms

Figure 5. Startup Waveform

3

SNVA377D – March 2009 – Revised April 2013

AN-1908 LM2842 Evaluation Board

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