PIN

NAME

FUNCTION

1

FOSC

Resistor-Programmable Switching-Frequency-Setting Control Input. Connect a resistor from FOSC to

AGND to set the switching frequency.

2

OUT

Switching-Regulator Output. OUT also provides power to the internal circuitry when the output voltage

of the converter is set between 3V to 5V during skip mode at very light load conditions after BIAS is

switched over to buck output.

3

FB

Feedback Input. Connect an external resistive divider from OUT to FB and AGND to set the output

voltage. Connect to BIAS to set the output voltage to 5V or 3.3V.

4

COMP

Error-Amplifier Output. Connect an RC network from COMP to AGND for stable operation. See the

Compensation Network section for more details.

5

BIAS

Linear Regulator Output. BIAS powers up the internal circuitry. Bypass with a minimum of 2.2µF ceramic

capacitor to ground.

6

AGND

Analog Ground

7

EN

SUP Voltage-Compatible Enable Input. Drive EN low to disable the devices. Drive EN high to enable the

devices.

8, 9

SUPSW

Internal High-Side Switch Supply Input. SUPSW provides power to the internal switch. Bypass SUPSW

to PGND with a 0.1µF and 4.7µF ceramic capacitors.

10

SUP

Voltage-Supply Input. SUP powers up the internal linear regulator. Bypass SUP to PGND with a 2.2µF

ceramic capacitor.

16

17

18

19

4

3

2

1

20

5

10

9

8

7

6

12

13

14

15

11

MAX20002

MAX20003

LX

LX

LX

N.C.

FSYNC

SUP

SUPSW

SUPSW

EN

AGND

TQFN

(5mm x 5mm)

EP*

*EP = EXPOSED PAD

www.maximintegrated.com

Maxim Integrated │ 9

MAX20002/MAX20003

36V, 220kHz to 2.2MHz, 2A/3A Fully

Integrated Step-Down Converters

with 15μA Operating Current

Pin Configuration

Pin Description