MP8736– HIGHEFFICIENCY,FAST TRANSIENT,6A, 19V SYNCHRONOUSBUCKCONVERTERIN ATINY3X4mmPACKAGE

MP8736 Rev. 1.34

www.MonolithicPower.com

20

4/18/2012

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© 2012 MPS. All Rights Reserved.

Table 1—Inductor Selection Guide

Part Number

Manufacturer

Inductance

(µH)

DCR

(mΩ)

Current

Rating (A)

Dimensions

L

x W x H (mm

Switching

Frequency

(kHz)

PCMC-135T-

R68MF

Cyntec

0.68

1.7

34

13.5 x 12.6 x 4.8

600

FDA1254-1R0M

TOKO

1

2

25.2

13.5 x 12.6 x 5.4

300~600

FDA1254-1R2M

TOKO

1.2

2.05

20.2

13.5 x 12.6 x 5.4

300~600

we-744314047

Wurth

0.47

1.35

20

7.00 x 6.90 x 4.80

600~2MHz

Typical Design Parameter Tables

The following tables include recommended

component values for typical output voltages

1.2V, 2.5V, 3.3V) and switching frequencies

(300kHz, 500kHz, and 700kHz). Refer to Tables

2-4 for design cases without external ramp

compensation and Tables 5-7 for design cases

with external ramp compensation. External ramp

is not needed when high-ESR capacitors, such

as electrolytic or POSCAPs are used. External

ramp is needed when low-ESR capacitors, such

as ceramic capacitors are used. For cases not

listed in this datasheet, a calculator in excel

spreadsheet can also be requested through a

local sales representative to assist with the

calculation.

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R7

(kΩ)

1.2

2.2

12.1

26.1

750

2.5

2.2

30

14.3

1500

3.3

1

40.2

13.3

1600

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R7

(kΩ)

1.2

1

12.1

26.1

442

2.5

1

30

14.3

845

3.3

1

40.2

13.3

1000

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R7

(kΩ)

1.2

1

12.1

26.1

316

2.5

1

30

14.3

590

3.3

1

40.2

13.3

806

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

R7

(kΩ)

1.2

2.2

12.1

26.1

330

220

750

2.5

2.2

30

14.3

402

220

1500

3.3

2.2

40.2

12.4

422

220

1600

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

R7

(kΩ)

1.2

1

12.1

26.1

374

220

442

2.5

1

30

14.3

412

220

845

3.3

1

40.2

12.4

422

220

1000

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

R7

(kΩ)

1.2

1

12.1

26.1

240

220

316

2.5

1

30

14.3

412

220

590

3.3

1

40.2

12.4

422

220

806

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

R7

(kΩ)

0.9

0.47

1.8

20

200

270

89.8

1

0.47

4.37

20

200

270

100

1.2

0.47

9.92

20

200

270

115