adp1871 datasheet(10/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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10 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 10 of 44

601.0

600.5

600.0

599.5

599.0

598.5

598.0

597.5

597.0

–40.0

–7.5

25.0

57.5

90.0

122.5

TEMPERATURE (°C)

VREG = 5V, VIN = 13V

VREG = 5V, VIN = 30V

Figure 22. Feedback Voltage vs. Temperature

325

315

305

295

285

275

265

255

10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2

VIN (V)

+125°C

+25°C

–40°C

NO LOAD

Figure 23. Switching Frequency vs. High Input Voltage, 300 kHz, ±10% of 12 V

650

600

550

500

450

400

13.0

13.4

13.8

14.2

14.6

15.0

15.4

15.8

16.2

VIN (V)

+125°C

+25°C

–40°C

NO LOAD

Figure 24. Switching Frequency vs. High Input Voltage, 600 kHz, VOUT = 1.8 V,

VIN Range = 13 V to 16.5 V

900

880

860

840

820

800

780

760

740

720

700

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

VIN (V)

+125°C

+25°C

–40°C

Figure 25. Switching Frequency vs. High Input Voltage, 1.0 MHz,

VIN Range = 13 V to 16.5 V

280

190

205

220

235

250

265

0

10,000

8000

6000

4000

2000

LOAD CURRENT (mA)

VIN = 13V

VIN = 20V

VIN = 16.5V

+125°C

+25°C

–40°C

Figure 26. Frequency vs. Load Current, 300 kHz, VOUT = 0.8 V

330

240

250

260

270

280

290

300

310

320

0

15,00

12,000 13,500

10,500

9000

7500

6000

4500

3000

1500

LOAD CURRENT (mA)

VIN = 20V

VIN = 13V

VIN = 16.5V

+125°C

+25°C

–40°C

Figure 27. Frequency vs. Load Current, 300 kHz, VOUT = 1.8 V

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