MAX16838ATP/V+ Maxim Integrated, MAX16838ATP/V+ Datasheet - Page 9

• Manufacturer Part Number: MAX16838ATP/V+
• Description: LED Lighting Drivers Integrated 2-Channel High-Brightness LED Drivers with High-Voltage DC-DC Controller
• Manufacturer: Maxim Integrated

Specifications of MAX16838ATP/V+

• Input Voltage: 4.75 V to 40 V
• Maximum Supply Current: 3.1 mA
• Power Dissipation: 2051 mW

Integrated, 2-Channel, High-Brightness LED Driver
TQFN
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
with High-Voltage Boost and SEPIC Controller
PIN
TSSOP
10
11
12
13
14
15
16
17
18
4
5
6
7
8
9
_______________________________________________________________________________________
LEDGND
NAME
COMP
SGND
NDRV
OUT2
OUT1
ISET
DRV
CFB
V
FLT
OV
EN
RT
IN
CC
Gate Drive for Switching MOSFET. Connect NDRV to GATE directly or through a resistor
to control the rise and fall times of the gate drive.
5V Regulator Output. MOSFET gate-driver supply input. Bypass DRV to PGND with a
minimum of 1FF ceramic capacitor. Place the capacitor as close as possible to DRV
and PGND.
Internal Circuitry Supply Voltage. Bypass V
ceramic capacitor. Place the capacitor as close as possible to V
Supply Input. Connect a 4.75V to 40V supply to IN. Bypass IN to PGND with a minimum
of 1FF ceramic capacitor. For a 5V Q10% supply voltage, connect V
Enable/Undervoltage Lockout (UVLO) Threshold Input. EN is a dual-function input.
Connect EN to V
Signal Ground. SGND is the current return path connection for the low-noise analog
signals. Connect SGND, LEDGND, and PGND at a single point.
Current Foldback Reference Input. Connect a resistor-divider between IN, CFB, and
ground to set the current foldback threshold. When the voltage at CFB goes below
1.23V, the LED current starts reducing linearly. Connect to V
foldback feature.
Overvoltage Threshold Adjust Input. Connect a resistor-divider from the switching
converter output to OV and SGND. The OV comparator reference is internally set to 1.23V.
LED Current Adjust Input. Connect a resistor R
current through each LED string (I
Open-Drain, Active-Low Flag Output. FLT asserts when there is an open/short-LED
condition at the output or when there is a thermal shutdown event.
LED String Cathode Connection 2. OUT2 is the open-drain output of the linear current
sink that controls the current through the LED string connected to OUT2. OUT2 sinks
up to 150mA.
LED Ground. LEDGND is the return path connection for the linear current sinks.
Connect SGND, LEDGND, and PGND at a single point.
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.
Oscillator Timing Resistor Connection. Connect a timing resistor (R
to program the switching frequency. Apply an AC-coupled external clock at RT to
synchronize the switching frequency with an external clock source.
Switching Converter Compensation Input. Connect an RC network from COMP to SGND
(see the Feedback Compensation section).
IN
through a resistor-divider to program the UVLO threshold.
LED
) according to the formula I
FUNCTION
CC
to SGND with a minimum of 0.1FF
ISET
from ISET to SGND to set the
CC
Pin Description
to disable the current
CC
LED
RT
and SGND.
IN
) from RT to SGND
= 1512V/R
to V
CC
.
ISET
.
9