MAX16816 Datasheet, PDF (1/33 Pages) Maxim Integrated Products – Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming

19-1054; Rev 0; 1/08
EVAALVUAAILTAIOBNLEKIT
Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
General Description
The MAX16816 is a current-mode, high-brightness LED
(HB LED) driver designed to control two external
n-channel MOSFETs for single-string LED current regu-
lation. The MAX16816 integrates all the building blocks
necessary to implement fixed-frequency HB LED dri-
vers with wide-range dimming control and EEPROM-
programmable LED current binning with a factor of up
to 1.6. This device is configurable to operate as a step-
down (buck), step-up (boost), or step-up/step-down
(buck-boost) current regulator.
Current-mode control with adjustable leading-edge
blanking simplifies control-loop design. Adjustable slope
compensation stabilizes the current loop when operating
at duty cycles above 50%. The MAX16816 operates over
a wide input voltage range and is capable of withstand-
ing automotive load-dump events. Multiple MAX16816
devices can be synchronized to each other or to an
external clock. The MAX16816 includes a floating
dimming driver for brightness control with an external
n-channel MOSFET in series with the LED string.
HB LEDs using the MAX16816 can achieve efficiencies
of over 90% in automotive applications. The MAX16816
also includes a 1.4A source and 2A sink gate driver for
driving switching MOSFETs in high-power LED driver
applications, such as front light assemblies. Dimming
control allows for wide PWM dimming range at frequen-
cies up to 5kHz. Higher dimming ratios (up to 1000:1)
are achievable at lower dimming frequencies.
The MAX16816 provides user-programmable features
through on-chip nonvolatile EEPROM registers.
Adjustable features include a programmable soft-start,
LED current (binning), external MOSFET gate driver sup-
ply voltage, slope compensation, leading-edge blanking
time, and disabling/enabling of the RT oscillator.
The MAX16816 is available in a 32-pin TQFN package
with exposed pad and operates over the -40°C to
+125°C automotive temperature range.
Applications
Automotive Exterior: Rear Combination Lights
(RCL), Daytime Running Lights (DRL), Fog and
Front Lighting, High-Beam/Low-Beam/Turn Lights
General Illumination
Navigation and Marine Indicators
Neon Replacement, Emergency Lighting
Signage and Beacons
Features
o EEPROM-Programmable LED Current Binning
o Wide Input Range: 5.9V to 76V with Cold Start
Operation to 5.4V
o Integrated Floating Differential LED Current-
Sense Amplifier
o Floating Dimming Driver Capable of Driving an
n-Channel MOSFET
o 5% or Better LED Current Accuracy
o Multiple Topologies: Buck, Boost, Buck-Boost,
SEPIC
o Resistor-Programmable Switching Frequency
(125kHz to 500kHz) and Synchronization
Capability
o 200Hz On-Board Ramp Allows Analog-Controlled
PWM Dimming and External PWM Dimming
o Output Overvoltage, Overcurrent, and LED Short
Protection
o Enable/Shutdown Input with Shutdown Current
Below 45µA
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX16816ATJ+ -40°C to +125°C 32 TQFN-EP* T3255M-4
+Denotes a lead-free package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Operating Circuits
BUCK-BOOST CONFIGURATION
VIN
RUV2
RCS
CCLMP
RUV1
VCC
LO CLMP CS- CS+ DGT
UVEN
RD
QS
CUVEN
DRV
LEDs
SNS+
CREG1
DIM
DIM
REG1
RT
RTSYNC
MAX16816
SNS-
QGND
RSENSE
HI
CF
ROV1
FAULT
OV
COMP CS FB AGND SGND REG2 DRI
ROV2
R1
CREG2
C2
C1
R2
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.