Pin Description

PIN

NAME

FUNCTION

TQFN/

QFND

TSSOP

1

4

IN

Bias Supply Input. Connect a 4.75V to 40V supply to IN. Bypass IN to SGND with a ceramic

capacitor.

2

5

EN

Enable Input. Connect EN to logic-low to shut down the device. Connect EN to logic-high or IN

for normal operation. The EN logic threshold is internally set to 1.23V.

3

6

COMP

Switching Converter Compensation Input. Connect the compensation network from COMP to

SGND for current-mode control (see the Feedback Compensation section).

4

7

RT

Oscillator Timing Resistor Connection. Connect a timing resistor (RT) from RT to SGND to program

the switching frequency according to the formula RT = 7.350 x 109/fsw (for the MAX16814A_ _

and the MAX16814U_ _) or to the formula RT = 7.72 x 109/fsw (for the MAX16814B_ _ _). Apply an

AC-coupled external clock at RT to synchronize the switching frequency with an external clock.

5

8

FLT

Open-Drain Fault Output. FLT asserts low when an open LED, short LED, or thermal shutdown

6

9

OVP

Overvoltage-Threshold-Adjust Input. Connect a resistor-divider from the switching converter

output to OVP and SGND. The OVP comparator reference is internally set to 1.23V.

7

10

SETI

8

11

RSDT

LED short detection. The LED short detection comparator is internally referenced to 2V.

9

12

SGND

Signal Ground. SGND is the current return path connection for the low-noise analog signals.

Connect SGND, LEDGND, and PGND at a single point.

10

13

DIM

Digital PWM Dimming Input. Apply a PWM signal to DIM for LED dimming control. Connect

11

14

OUT1

LED String Cathode Connection 1. OUT1 is the open-drain output of the linear current sink that

controls the current through the LED string connected to OUT1. OUT1 sinks up to 150mA. If

unused, connect OUT1 to LEDGND.

www.maximintegrated.com

Maxim Integrated │ 8

MAX16814

Integrated, 4-Channel, High-Brightness LED

Driver with High-Voltage DC-DC Controller