MAX26239/MAX26240

4.5V to 36V, 6A Buck-Boost Converters

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Analog Devices | 9

5, 6

PGND1

Power Ground Connection for Buck Low-Side FET LS1. Connect PGND1 and PGND2 together to power

ground.

7

LX1

Buck-Boost Converter Switching Node 1. Connect LX1 to one side of the power inductor.

8

LX2

Buck-Boost Converter Switching Node 2. Connect LX2 to the other side of the power inductor.

9, 10

PGND2

Power Ground Connection for Boost Low-Side FET LS2. Connect PGND1 and PGND2 together to

power ground.

11

NC

Not Connected

12, 13

OUT

Buck-Boost Converter Output

14

BST2

Bootstrap Capacitor Connection for Switching Node LX2. Connect a 0.1μF ceramic capacitor between

LX2 and BST2.

15

EN

High-Voltage-Tolerant Enable Input. Drive EN high to enable buck-boost converter.

16

FB

Feedback Input. Connect FB to a resistor-divider between OUT and AGND to set the desired output

voltage in the range of 3V to 20V. Connect FB to VCC for the fixed output voltage option.

17

COMP

Error Amplifier Output. Connect an RC-compensation network between COMP and AGND to stabilize

the control loop.

18

SPS

Spread-Spectrum (SPS) Function Enable Input. Connect SPS high to enable SPS function and low to

disable SPS function.

19

SYNC

External Clock Synchronization and Skip/PWM Mode Control Input. Connect SYNC to AGND to enable

skip mode. Connect SYNC to VCC to enable PWM mode. Connect SYNC to a valid external clock to

synchronize the buck-boost converter switching frequency to an external clock.

20

PGOOD

Open-Drain, Power-Good Indicator. Pull up PGOOD with an external resistor to VCC or a positive voltage

lower than 5.5V to correctly indicate the OUT voltage status. PGOOD asserts low when the OUT voltage

falls below 93% (typ) of its regulation voltage. PGOOD becomes high impedance when the OUT voltage

rises above 94% (typ) of its regulation voltage. PGOOD is also in low during soft-start and in shutdown.

21

VCC

Internal 1.8V Regulator Output. Bypass VCC to ground with a minimum 4.7μF ceramic capacitor.

22

AGND

Analog Ground. Connect AGND, PGND1, and PGND2 together at a single point in a star-ground

connection.