ADP1871 datasheet(16/44 Pages) AD

Part #	ADP1871

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

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Manufacturer	AD [Analog Devices]

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16 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 16 of 44

CH1 1V BW

CH2 5A

Ω

CH3 10V BW

CH4 2V

M1ms

A CH1

1.56V

T 63.2%

1

2

3

4

OUTPUT VOLTAGE

INDUCTOR CURRENT

SW NODE

LOW SIDE

Figure 58. Soft Start and RES Detect Waveform

2

CH2 5V

CH3 5V

MATH 2V 40ns

CH4 2V

M40ns

A CH2

4.20V

T 29.0%

3

M

4

HIGH SIDE

HS MINUS

SW

SW NODE

LOW SIDE

TA = 25°C

Figure 59. Output Drivers and SW Node Waveforms

2

CH2 5V

CH3 5V

MATH 2V 40ns

CH4 2V

M40ns

A CH2

4.20V

T 29.0%

3

M

4

HIGH SIDE

HS MINUS

SW

SW NODE

LOW SIDE

16ns (

tf,DRVL)

25ns (

tr,DRVH)

22ns (

tpdhDRVH)

TA = 25°C

Figure 60. Upper-Side Driver Rising and Lower-Side Falling Edge Waveforms

(CIN = 4.3 nF (Upper-/Lower-Side MOSFET),

QTOTAL = 27 nC (VGS = 4.4 V (Q1), VGS = 5 V (Q3))

2

CH2 5V

CH3 5V

MATH 2V 20ns

CH4 2V

M20ns

A CH2

4.20V

T 39.2%

3

M

4

HIGH SIDE

HS MINUS

SW

SW NODE

LOW SIDE

18ns (

tr,DRVL)

24ns (

tpdh,DRVL)

11ns (

tf,DRVH)

TA = 25°C

Figure 61. Upper-Side Driver Falling and Lower-Side Rising Edge Waveforms

(CIN = 4.3 nF (Upper-/Lower-Side MOSFET),

QTOTAL = 27 nC (VGS = 4.4 V (Q1), VGS = 5 V (Q3))

570

550

530

510

490

470

450

430

–40

–20

120

100

80

60

40

20

0

TEMPERATURE (°C)

VREG = 5.5V

VREG = 3.6V

VREG = 2.7V

Figure 62. Transconductance (Gm) vs. Temperature

680

330

380

430

480

530

580

630

2.7

3.0

5.4

4.8

5.1

4.5

4.2

3.9

3.6

3.3

VREG (V)

+125°C

+25°C

–40°C

Figure 63. Transconductance (Gm) vs. VREG

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