19-XXXX; Rev 0; 10/07

Switch-Mode LED Driver with

Analog-Controlled PWM Dimming
General Description Features

MAX16816
The MAX16816 is a current-mode, high-brightness LED ♦ Wide Input Range: 5.9V to 76V With Cold Start
(HBLED) driver designed to control two external n- Operation to 5.4V
channel MOSFETs for single-string LED current regula- ♦ Integrated Floating Differential LED Current-
tion. The MAX16816 integrates all the building blocks Sense Amplifier
necessary to implement fixed-frequency HBLED drivers ♦ Floating Dimming Driver Capable of Driving an

Y
with wide-range dimming control and EEPROM-pro- n-Channel MOSFET
grammable LED current binning with a factor of 1.6. ♦ 5% or Better LED Current Accuracy
This device is configurable to operate as a step-down ♦ Multiple Topologies: Buck, Boost, Buck-Boost,
(buck), step-up (boost), or step-up/down (buck-boost) SEPIC

R
current regulator.
♦ Resistor-Programmable Switching Frequency
Current-mode control with adjustable leading-edge (125kHz to 600kHz) and Synchronization
blanking simplifies control-loop design. Adjustable slope Capability
compensation stabilizes the current loop when operating ♦ 200Hz On-Board Ramp Dimming and External

A
at duty cycles above 50%. The MAX16816 operates over PWM Dimming
a wide input voltage range and is capable of withstand- ♦ Output Overvoltage, Overcurrent, and LED Short
ing automotive load-dump events. Multiple MAX16816 Protection
devices can be synchronized to each other or to an
IN
external clock. The MAX16816 includes a floating dim-
ming driver for brightness control with an external n-
channel MOSFET in series with the LED string.
HBLEDs using the MAX16816 can achieve efficiencies
♦ Enable/Shutdown Input with Shutdown Current
Below 45µA
♦ EEPROM-Programmable LED Current Binning

Ordering Information
of over 90% in automotive applications. The MAX16816
also includes a 1.4A source and 2A sink gate driver for
M
PIN- PKG
PART TEMP RANGE
driving switching MOSFETs in high-power LED driver PACKAGE CODE
applications, such as front light assemblies. Dimming MAX16816ATJ+ -40°C to +125°C 32 TQFN-EP* T3255M-4
control allows for wide PWM dimming range at frequen-
cies up to 5kHz. Higher dimming ratios (up to 1000:1) +Denotes lead-free package.
LI

are achievable at lower dimming frequencies. *EP = Exposed pad.

The MAX16816 provides user-programmable features Pin Configuration appears at end of data sheet.
through on-chip nonvolatile EEPROM registers.
Adjustable features include a programmable soft-start, Typical Operating Circuits
LED load current (binning), external MOSFET gate dri- BUCK-BOOST CONFIGURATION
VIN
ver supply voltage, slope compensation, blanking time,
E

and disabling/enabling of the RT oscillator. CCLMP

RCS

RUV2
The MAX16816 is available in a 32-pin TQFN package
with exposed pad and operates over the -40°C to LO CLMP CS- CS+ DGT
R

RUV1 VCC

+125°C automotive temperature range. CUVEN

UVEN
DRV
RD QS

LEDs
SNS+

Applications DIM
RSENSE
DIM
SNS-
Automotive Exterior: Rear Combination Lights
P

REG1 MAX16816 QGND

(RCL), Daytime Running Lights (DRL), Fog and CREG1

RT HI
CF
Front Lighting, High-Beam/Low-Beam/Turn Lights RTSYNC
ROV1

Directional Lamp Adjustment FAULT

OV

COMP CS FB AGND SGND REG2 DRI

General Illumination ROV2

R1
CREG2
Navigation and Marine Indicators
C2
Neon Replacement, Emergency Lighting C1
R2

Signage and Beacons

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.