ADP1871 datasheet(32/44 Pages) AD

Part #	ADP1871

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

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32 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 32 of 44

Marking Code

SAP Model

ADP1870

ADP1871

VOUT

(V)

VIN

(V)

CIN

(μF)

COUT

(μF)

L1

(μH)

RC

(kΩ)

CCOMP

(pF)

CPAR

(pF)

RTOP

(kΩ)

LDY

LDN

5

16.5

3 × 109

3 × 476

1.0

34

268

27

110.0

LDY

LDN

7

16.5

3 × 109

222 + 476

1.0

34

228

23

160.0

1 See the

section and

.

Inductor Selection

Table 11

Table 11. Recommended Inductors

2 22 μF Murata 25 V, X7R, 1210 GRM32ER71E226KE15L (3.2 mm × 2.5 mm × 2.5 mm).

3 560 μF Panasonic (SP-series) 2 V, 7 mΩ, 3.7 A EEFUE0D561LR (4.3 mm × 7.3 mm × 4.2 mm).

4 270 μF Panasonic (SP-series) 4 V, 7 mΩ, 3.7 A EEFUE0G271LR (4.3 mm × 7.3 mm × 4.2 mm).

5 330 μF Panasonic (SP-series) 4 V, 12 mΩ, 3.3 A EEFUE0G331R (4.3 mm × 7.3 mm × 4.2 mm).

6 47 μF Murata 16 V, X5R, 1210 GRM32ER61C476KE15L (3.2 mm × 2.5 mm × 2.5 mm).

7 150 μF Panasonic (SP-series) 6.3 V, 10 mΩ, 3.5 A EEFUE0J151XR (4.3 mm × 7.3 mm × 4.2 mm).

8 180 μF Panasonic (SP-series) 4 V, 10 mΩ, 3.5 A EEFUE0G181XR (4.3 mm × 7.3 mm × 4.2 mm).

9 10 μF TDK 25 V, X7R, 1210 C3225X7R1E106M.

L (μH)

DCR (mΩ)

ISAT (A)

Dimension (mm)

Manufacturer

Model Number

0.12

0.33

55

10.2 × 7

Würth Elektronik

744303012

0.22

0.33

30

10.2 × 7

Würth Elektronik

744303022

0.47

0.67

50

13.2 × 12.8

Würth Elektronik

744355147

0.72

1.3

35

10.5 × 10.2

Würth Elektronik

744325072

0.9

1.6

28

13 × 12.8

Würth Elektronik

744355090

1.2

1.8

25

10.5 × 10.2

Würth Elektronik

744325120

1.0

3.3

20

10.5 × 10.2

Würth Elektronik

7443552100

1.4

3.2

24

14 × 12.8

Würth Elektronik

744318180

2.0

2.6

22

13.2 × 10.8

Würth Elektronik

7443551200

0.8

2.5

16.5

12.5 × 12.5

AIC Technology

CEP125U-R80

Table 12. Recommended MOSFETs

VGS = 4.5 V

RON

(mΩ)

ID

(A)

VDS

(V)

CIN

(nF)

QTOTAL

(nC)

Package

Manufacturer

Model Number

Upper-Side MOSFET

(Q1/Q2)

5.4

47

30

3.2

20

PG-TDSON8

Infineon

BSC042N03MS G

10.2

53

30

1.6

10

PG-TDSON8

Infineon

BSC080N03MS G

6.0

19

30

35

SO-8

Vishay

Si4842DY

9

14

30

2.4

25

SO-8

International Rectifier

IRF7811

Lower-Side MOSFET

(Q3/Q4)

5.4

47

30

3.2

20

PG-TDSON8

Infineon

BSC042N03MS G

10.2

82

30

1.6

10

PG-TDSON8

Infineon

BSC080N03MS G

6.0

19

30

35

SO-8

Vishay

Si4842DY

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