MAX16814_15 Datasheet, PDF (8/25 Pages) Maxim Integrated Products – Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller

MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
Pin Description
PIN
TQFN/
QFND
TSSOP
NAME
1
4
IN
2
5
EN
3
6
COMP
4
7
RT
5
8
FLT
6
9
OVP
7
10
SETI
8
11
RSDT
9
12
SGND
10
13
DIM
11
14
OUT1
FUNCTION
Bias Supply Input. Connect a 4.75V to 40V supply to IN. Bypass IN to SGND with a ceramic
capacitor.
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.
Switching Converter Compensation Input. Connect the compensation network from COMP to
SGND for current-mode control (see the Feedback Compensation section).
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.
Open-Drain Fault Output. FLT asserts low when an open LED, short LED, or thermal shutdown
is detected. Connect a 10kω pullup resistor from FLT to VCC.
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.
LED Current-Adjust Input. Connect a resistor (RSETI) from SETI to SGND to set the current
through each LED string (ILED) according to the formula ILED = 1500/RSETI.
LED Short Detection Threshold Adjust Input. Connect a resistive divider from VCC to RSDT and
SGND to program the LED short detection threshold. Connect RSDT directly to VCC to disable
LED short detection. The LED short detection comparator is internally referenced to 2V.
Signal Ground. SGND is the current return path connection for the low-noise analog signals.
Connect SGND, LEDGND, and PGND at a single point.
Digital PWM Dimming Input. Apply a PWM signal to DIM for LED dimming control. Connect
DIM to VCC if dimming control is not used.
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.
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