Dual-Phase, Parallelable, Average Current-Mode

Controllers

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11

Detailed Description

The MAX5038/MAX5041 (Figures 1 and 2) average cur-

rent-mode PWM controllers drive two out-of-phase

buck converter channels. Average current-mode con-

trol improves current sharing between the channels

while minimizing component derating and size. Parallel

multiple MAX5038/MAX5041 regulators to increase the

output current capacity. For maximum ripple rejection

at the input, set the phase shift between phases to 90°

for two paralleled converters, or 60° for three paralleled

converters. Paralleling the MAX5038/MAX5041s

improves design flexibility in applications requiring

upgrades (higher load).

CLKIN

PLLCMP

PGND

PHASE

DL2

LX2

DH2

DL1

LX1

DH1

EAOUT

EAN

DIFF

EN

CSP2

CSN2

CSP1

CSN1

MAX5038

3

R1

C39

C1, C2

21

15

IN

C25

C26

R4

R7

R8

R6

C29

C30

R5

C27

C28

SGND

CLP2

CLP1

Q2

Q1

D2

Q2

D1

Q1

D4

D3

C32

C12

C31

C3–C7

L2

R3

L1

R2

C13

C8–C11

C14,

C15

C16–C24,

C33

LOAD

+1.8V AT 60A

SENSE -

SENSE +

17

18

19

16

20

25

24

23

26

9

8

14

13

1

2

BST1

28

4

10

11

12

7

5

6

22

BST2

NOTE: SEE TABLE 1 FOR COMPONENT VALUES.