TQFN

NAME

FUNCTION

MAX20053D

1, 24

AGND

Analog Ground. Pins 1 and 24 should be shorted outside the IC.

2

REFI

Analog Dimming-Control Input. Connect an analog voltage from 0 to 1.2V for analog dimming of

LED current.

3

5V Regulator Output. Connect a 1μF ceramic capacitor to AGND from this pin for stable operation.

4

BST

High-Side Power Supply for Gate Drive. Connect a 0.1μF ceramic capacitor from BST to LX.

5, 6, 7, 8

LX

Switching Node. Connect to one end of output inductor.

9

NC

No Connect

10, 11

PGND

Power Ground

12, 13

IN

Power-Supply Input. Bypass to PGND with a minimum of 1μF ceramic capacitor.

14

NC

No Connect

15, 16

CS+

Current-Sense Positive Pin. This is the positive input of the high-side average current-mode

control amplifier. See the Programming the LED Current section for information on setting the

resistor value. The output inductor and current-sense resistor are connected at this node.

17

NC

No Connect

18

CS-

Current-Sense Negative Pin. This is the negative input of the high-side average current-mode

control amplifier. See the Programming the LED Current section for information on setting the

resistor value. This node goes to the anode of the LED string. One end of the current-sense

resistor connects to this pin.

19

PWM

Logic-Level Dimming Input. Drive PWM low to turn off the current regulator. Drive PWM high to

enable the current regulator. If PWM is driven low for greater than 210ms, the device turns off.

20

NC

No Connect

21

FLT

Open-Drain Fault Output. Refer to the Fault Pin Behavior section for information on Fault.

22

NC

No Connect

23

COMP

Compensation Output. Connect an external RC network for loop compensation.

—

EP

Exposed Pad. Connect EP to a large-area ground plane for effective power dissipation. Connect

EP to AGND. Do not use as the only ground connection.

MAX20050–MAX20053

2A Synchronous-Buck LED Drivers

with Integrated MOSFETs

www.maximintegrated.com

Maxim Integrated │ 9

Pin Descriptions (continued)