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MAX15035ETL

15A Step-Down Regulator with Internal Switches

Maxim Integrated 

MAX15035

15A Step-Down Regulator with Internal Switches

Ceramic capacitors have a high-ESR zero frequency, but

applications with sufficient current-sense compensation

may still take advantage of the small size, low ESR, and

high reliability of the ceramic chemistry. Using the inductor

DCR, applications using ceramic output capacitors may

be compensated using either a DC compensation or AC

compensation method (Figure 11).

The DC-coupling requires fewer external compensa-

tion capacitors, but this also creates an output load line

that depends on the inductor’s DCR (parasitic resis-

tance). Alternatively, the current-sense information may

be AC-coupled, allowing stability to be dependent only on

the inductance value and compensation components and

eliminating the DC load line.

OPTION A: DC-COUPLED CURRENT-SENSE COMPENSATION

IN

INPUT

BST

CIN

PWR

DC COMPENSATION

<> FEWER COMPENSATION COMPONENTS

<> CREATES OUTPUT LOAD LINE

<> LESS OUTPUT CAPACITANCE REQUIRED

FOR TRANSIENT RESPONSE

LX

PGND

MAX15035

PWR

FB

GND

AGND

PWR

RSENA

L

RSENB

CSEN

COUT

PWR

OUTPUT

STABILITY REQUIREMENT



 (R SENA

||

L

R SENB

)

C

SEN





C

OUT

≥

1

2fSW

AND LOAD LINE =

R SENBR DCR

R SENA + R SENB

FEEDBACK RIPPLE IN PHASE WITH INDUCTOR CURRENT

OPTION B: AC-COUPLED CURRENT-SENSE COMPENSATION

IN

CIN

BST

PWR

INPUT

AC COMPENSATION

<> NOT DEPENDENT ON ACTUAL DCR VALUE

<> NO OUTPUT LOAD LINE

LX

PGND

MAX15035

PWR

FB

GND

AGND

PWR

RSEN

L

CSEN

COUT

PWR

OUTPUT

CCOMP

RCOMP

STABILITY REQUIREMENT







R

L

SENC SEN







C

OUT

≥

1

2fSW

AND R COMPC COMP

≥1

fSW

FEEDBACK RIPPLE IN PHASE WITH INDUCTOR CURRENT

Figure 11. Feedback Compensation for Ceramic Output Capacitors

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