Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LED driver Linear TQFN 16 Surface-mount

General Description

The MAX16800 current regulator operates from a 6.5V

to 40V input voltage range and delivers up to a total of

350mA to one or more strings of high-brightness LEDs.

The output current of the MAX16800 is adjusted by

using an external current-sense resistor in series with

the LEDs. An enable input allows wide-range “pulsed”

dimming. Wave-shaping circuitry reduces EMI. The dif-

ferential current-sense input increases noise immunity.

The MAX16800 is well suited for applications requiring

high-voltage input and is able to withstand automotive

load-dump events up to 40V. An on-board pass ele-

ment minimizes external components while providing

±3.5% output current accuracy. Additional features

include a 5V regulated output and short-circuit and

thermal protection.

The MAX16800 is available in a thermally enhanced,

5mm x 5mm, 16-pin TQFN package and is specified

over the automotive -40°C to +125°C temperature range.

Applications

Automotive Interior: Map, Courtesy, and Cluster

Lighting

Automotive Exterior: Tail Lights and CHMSL

Warning Lights for Emergency Vehicles

Navigation and Marine Indicators

General Illumination

Signage, Gasoline Canopies, Beacons

Features

♦ +6.5V to +40V Operating Range

♦ Adjustable Level (35mA to 350mA)

♦ ±3.5% Output Current Accuracy

♦ Integrated Pass Element with Low-Dropout

Voltage (0.5V typ)

♦ Output Short-Circuit Protection

♦ +5V Regulated Output with 4mA Source

Capability

♦ Thermal Shutdown

♦ Differential LED Current Sense

♦ High-Voltage Enable Pin for Dimming Interface

♦ Low Shutdown Supply Current (12μA typ)

♦ Low 204mV Current-Sense Reference Reduces

Power Losses

♦ Wave-Shaped Soft Edges Reduce Radiated EMI

During PWM Dimming

♦ Available in Small, Thermally Enhanced,

5mm x 5mm, 16-Pin TQFN Package

♦ -40°C to +125°C Operating Temperature Range

MAX16800

High-Voltage, 350mA, Adjustable Linear

High-Brightness LED (HB LED) Driver

________________________________________________________________

Maxim Integrated Products

N.C.

OUT

CS+

GND

N.C.

12 11 9

OUT

N.C.

MAX16800

IN CS-

N.C.

TQFN

TOP VIEW

Pin Configuration

Ordering Information

MAX16800

OUT

LEDs

SENSE

0.1μF

+6.5V TO +40V

+5V REG

CS+

0.1μF

CS-

PWM DIMMING

GND

Simplified Diagram

19-3803; Rev 1; 4/09

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.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed paddle.

/V denotes an automotive qualified part.

PART TEMP RANGE PIN-PACKAGE

MAX16800ATE+ -40°C to +125°C 16 TQFN-EP*

MAX16800ATE/V+ -40°C to +125°C 16 TQFN-EP*

Summary of content (8 pages)

PAGE 1
9-3803; Rev 1; 4/09 High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver The MAX16800 current regulator operates from a 6.5V to 40V input voltage range and delivers up to a total of 350mA to one or more strings of high-brightness LEDs. The output current of the MAX16800 is adjusted by using an external current-sense resistor in series with the LEDs. An enable input allows wide-range “pulsed” dimming. Wave-shaping circuitry reduces EMI.
PAGE 2
MAX16800 High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN 5mm x 5mm (derate 33.3mW/°C above +70°C)............................2666.7mW Operating Junction Temperature Range ...........-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) ....................
PAGE 3
High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver (VIN = +12V, EN = VIN, CV5 = 0.1µF to GND, IV5 = 0, CS- = GND, connect RSENSE = 0.58Ω between CS+ and CS-. Connect OUT to CS+ (Note 1). TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (continued) (VIN = VEN = +12V, TA = +25°C, unless otherwise noted.) SHUTDOWN CURRENT vs. TEMPERATURE 0.7 0.6 ILOAD = 350mA 0.5 0.4 0.3 25 20 VIN = 20V 15 VIN = 12V 10 0.2 0 ILOAD = 1mA NO LOAD 5.3 5.2 ILOAD = 5mA 5.0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) +5V REGULATOR OUTPUT vs.
PAGE 5
High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver PIN NAME FUNCTION 1, 16 OUT 2, 3 IN 4–8, 13, 14 N.C. Not Internally Connected 9 CS+ Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+ and CS- to program the output current level. 10 CS- Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS- and CS+ to program the output current level. 11 V5 +5V Regulated Output.
PAGE 6
MAX16800 High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver power series pass device (see the Functional Diagram). The regulation point is factory set at (VCS+ VCS-) = 204mV ±3.5%. The regulated current is user defined by the value of RSENSE. The MAX16800 is a current controller internally optimized for driving the impedance range expected from one or more HB LEDs.
PAGE 7
High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver Chip Information PROCESS: BiCMOS Package Information 1 16 15 14 13 OUT EN N.C. N.C. For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. GND 12 OUT D1 VIN 2 IN 4 N.C. PACKAGE CODE DOCUMENT NO. 16 TQFN-EP T1655-3 21-0140 V5 11 IN C1 3 PACKAGE TYPE C2 MAX16800 CS- 10 RSENSE CS+ 9 N.C. N.C. N.C. N.C.
PAGE 8
MAX16800 High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver Revision History REVISION NUMBER REVISION DATE 0 8/05 Initial release 1 4/09 Updated data sheet with automotive part. DESCRIPTION PAGES CHANGED — 1, 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.