MPQ4470/4470A–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED

MPQ4470/4470A Rev. 1.1

www.MonolithicPower.com

17

8/26/2013

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© 2013 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 through

3 for design cases without external ramp

compensation, and Tables 4 through 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. For cases not listed in this datasheet,

an Excel spreadsheet available through your

local

sales

representative

can

calculate

approximate component values.

(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