LM3243_15 datasheet(8/32 Pages) TI

Part #	LM3243

Description	LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers

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Manufacturer	TI [Texas Instruments]

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8 / 32 page

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

0

2

4

6

8

10

12

INPUT VOLTAGE (V)

20 s/DIV

IOUT

2V/DIV

500 mA/DIV

VCON

2V/DIV

VOUT

3.0

3.5

4.0

4.5

5.0

5.5

6.0

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

INPUT VOLTAGE (V)

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

210

220

230

240

250

260

270

280

290

INPUT VOLTAGE (V)

2.5

3.0

3.5

4.0

4.5

5.0

5.5

2.4

2.6

2.8

3.0

3.2

3.4

3.6

INPUT VOLTAGE (V)

DROPOUT

IOUT= 1.5A

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

VCON (V)

2.5X GAIN

LM3243

SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015

www.ti.com

6.8 Typical Characteristics

VOUT = 3.4 V

VIN = 4.3 V down to Dropout

VIN = 4.2 V

RLOAD = 6.8 Ω

0.16 V < VCON < 1.4 V

Figure 1. Output Voltage vs. Supply Voltage

Figure 2. Output Voltage vs. VCON Voltage

VIN = 3.8 V

VOUT = 2.5 V

IOUT = 700 mA

2.7 V < VIN< 5.5 V (No Load)

VOUT = 1 V

Figure 3. Center-Switching Frequency vs. Supply Voltage

Figure 4. Quiescent Current (PFM) vs. Supply Voltage

VIN = 3.8 V

RLOAD = 6.8 Ω

VOUT = 0 V to 3 V

2.7 V < VIN< 5.5 V (No Load)

VOUT = 2.5 V

Figure 6. VCON Transient (3G/4G)

Figure 5. Quiescent Current (PWM) vs. Supply Voltage

8

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