MP4473–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER

MP4473 Rev. 1.0

www.MonolithicPower.com

18

12/15/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

Typical Design Parameter Tables

The following tables include recommended

component values for typical output voltages

(3.3V, 5V) and switching frequencies (300kHz,

500kHz, and 700kHz). Refer to tables 1—3 for

design

cases

without

external

ramp

compensation. Refer to tables 4—6 for design

cases with external ramp compensation. An

external ramp is not needed when using high-

ESR

capacitors,

such

as

electrolytic

or

POSCAPs. An external ramp is needed when

using low-ESR capacitors, such as ceramic

capacitors. To calculate approximate component

values for cases not listed, an Excel spreadsheet

is

available

through

your

local

sales

representative.

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

(kΩ)

3.3

10

30.1

10

110

5

10

51.1

10

169

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

(kΩ)

3.3

10

30.1

10

63.4

5

10

51.1

10

100

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

(kΩ)

3.3

10

30.1

10

44.2

5

10

51.1

10

69.8

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

(kΩ)

3.3

10

30.9

10

953

390

110

5

10

53.6

10

845

560

169

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

(kΩ)

3.3

10

31.6

10

620

390

63.4

5

10

53.6

10

845

390

100

(V)

L

(μH)

R1

(kΩ)

R2

(kΩ)

R4

(kΩ)

C4

(pF)

(kΩ)

3.3

10

31.6

10

560

390

44.2

5

10

54.9

10

620

390

69.8