LM2841 datasheet(6/19 Pages) TI1

Part #	LM2841

Description	LM2840/LM2841/LM2842/ LM2840-Q1/LM2841-Q1/LM2842-Q1 100/300/600 mA 42V Input Step-Down DC/DC Regulator in Thin SOT

PDF	19 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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6 / 19 page

1.1

1.7

2.3

2.8

3.4

4.0

SHDN PIN VOLTAGE (V)

1.2

1.0

0.9

0.7

0.6

0.4

LM2841, LM2842

SNVS540H – MARCH 2009 – REVISED APRIL 2013

www.ti.com

Typical Performance Characteristics (continued)

Switch Current Limit vs. SHDN Pin Voltage

(Soft-start Implementation, LM2842)

SHDN Pin Current vs. SHDN Pin Voltage

Figure 8.

Figure 9.

Switching Node and Output Voltage Waveforms

Load Transient Waveforms

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

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

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

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

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

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

T = 1 µs/div

T = 200 µs/div

Figure 10.

Figure 11.

Start-up Waveform

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

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

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

T = 40 µs/div

Figure 12.

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