MAX42408/MAX42410

36V, 8A/10A Fully Integrated Buck Converter

with 10μA Quiescent Current and Dual-Phase

Capability

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Analog Devices | 8

Pin Configurations

MAX42408/MAX42410

TOP VIEW

17 FC2QFN

3.5mm x 3.75mm

EN

BST

SUP

PGND

PGND

BIAS

GND

SUP

PGND

PGND

LX

8

9

4

3

11

10

2

1

5

17

7

6

12

MAX42408

MAX42410

Pin Descriptions

PIN

NAME

FUNCTION

1

EN

High-Voltage Compatible Enable Input. Drive EN high to enable the buck converter.

2

BST

High-Side Gate Driver Supply. Connect a 0.1μF ceramic capacitor between BST and LX.

3

SUP

IC Supply Input and Internal High-Side Switch Supply Input. Bypass SUP to PGND with 0.1μF and 4.7μF

ceramic capacitors as close as possible. Both SUP pins are internally connected.

4, 5

PGND

Power Ground. Connect all PGND pins together.

6

LX

Buck Inductor Connection. Connect an inductor from LX to the buck output. LX is high impedance when

the IC is disabled.

7, 8

PGND

Power Ground. Connect all PGND pins together.

9

SUP

IC Supply Input and Internal High-Side Switch Supply Input. Bypass SUP to PGND with 0.1μF and 4.7μF

ceramic capacitors as close as possible. Both SUP pins are internally connected.

10

GND

Analog Ground. Connect GND and PGND through start connection to the PCB ground plane.

11

BIAS

1.8V Internal Linear Regulator Output. Connect BIAS to ground with a minimum of 2.2μF ceramic

capacitor.

12

FB

Feedback Input. Connect FB to a resistor-divider between OUT and GND to adjust the output voltage

between 0.8V and 10V.

13

OUT

Output Voltage Sense Input. The buck converter uses OUT to sense output voltage.

14

VEA

Internal Voltage Loop Error Amplifier Output. Connect VEA of the controller and target together in dual-

phase operation. Leave VEA open for single-phase operation.

15

PGOOD

Open-Drain Power Good Output. The PGOOD is low if the buck output voltage falls below 93% (typ) of

regulation voltage. The PGOOD becomes high impedance when the buck output voltage rises above