ADP1871 datasheet(13/44 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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13 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 13 of 44

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FREQUENCY (kHz)

VREG = 2.7V

VREG = 5.5V

VREG = 3.6V

+125°C

+25°C

–40°C

Figure 40. Internal Rectifier Drop vs. Frequency

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2.73.13.53.94.34.75.15.5

VREG (V)

VIN = 5.5V

VIN = 16.5V

VIN = 13V

1MHz

300kHz

TA = 25°C

Figure 41. Internal Boost Rectifier Drop vs. VREG (Low Input Voltage)

Over VIN Variation

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560

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240

160

2.73.13.53.94.34.75.15.5

VREG (V)

1MHz

300kHz

+125°C

+25°C

–40°C

Figure 42. Internal Boost Rectifier Drop vs. VREG

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72

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2.73.13.53.94.34.75.15.5

VREG (V)

1MHz

300kHz

+125°C

+25°C

–40°C

Figure 43. Lower-Side MOSFET Body Diode Conduction Time vs. VREG

CH1 50mV

B

W

CH2 5A

Ω

CH3 10V

B

W

CH4 5V

M400ns

A CH2

3.90A

T 35.8%

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2

3

4

OUTPUT VOLTAGE

INDUCTOR CURRENT

SW NODE

LOW SIDE

Figure 44. Power Saving Mode (PSM) Operational Waveform, 100 mA

CH1 50mV

B

W

CH2 5A

Ω

CH3 10V

B

W

CH4 5V

M4.0µs

A CH2

3.90A

T 35.8%

1

2

3

4

OUTPUT VOLTAGE

INDUCTOR CURRENT

SW NODE

LOW SIDE

Figure 45. PSM Waveform at Light Load, 500 mA

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