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 standby mode.

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.

11

PGOOD

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