MAX16838 Maxim Integrated Products, MAX16838 Datasheet

MAX16838

Manufacturer Part Number

MAX16838

Description

High-Brightness LED Driver

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX16838.pdf (20 pages)

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19-4972; Rev 0; 9/09

Integrated, 2-Channel, High-Brightness LED Driver

The

grates both the DC-DC switching boost regulator and

two 150mA current sinks. A current-mode switching

DC-DC controller provides the necessary voltage to

both strings of HB LEDs. The MAX16838 accepts a wide

4.75V to 40V input voltage range and directly withstands

automotive load-dump events. For a 5V Q10% input volt-

age, connect V

powering HB LEDs for small-to-medium-sized LCD dis-

plays in automotive and display backlight applications.

An internal current-mode switching DC-DC controller

supports the boost or SEPIC topologies and operates

in an adjustable frequency range between 200kHz and

2MHz. The current-mode control provides fast response

and simplifies loop compensation. The MAX16838 also

features an adaptive output-voltage adjustment scheme

that minimizes the power dissipation in the LED current

sink paths. The MAX16838 can be combined with the

MAX15054 to achieve a buck-boost LED driver with two

integrated current sinks.

The channel current is adjustable from 20mA to 150mA

using an external resistor. The external resistor sets both

channel currents to the same value. The device allows

connecting both strings in parallel to achieve a maximum

current of 300mA in a single channel. The MAX16838

also features pulsed dimming control with minimum

pulse widths as low as 1Fs, on both channels through a

logic input (DIM).

The MAX16838 includes an output overvoltage protec-

tion, open LED, shorted LED detection and overtempera-

ture protection. The device operates over the -40NC to

+125NC automotive temperature range. The MAX16838

is available in the 20-pin TSSOP and 4mm x 4mm, 20-pin

TQFN packages.

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.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

MAX16838 is a dual-channel LED driver that inte-

Automotive Display Backlights

LCD Display Backlights

Automotive Lighting Applications

with High-Voltage Boost and SEPIC Controller

_______________________________________________________________ Maxim Integrated Products 1

to V

General Description

. The wide input range allows

Applications

S Integrated, 2-Channel, 20mA to 150mA Linear LED

S Boost or SEPIC Power Topologies for Maximum

S Adaptive Voltage Optimization to Minimize Power

S 4.75V to 40V or 5V ±10% Input Operating Voltage

S 5000:1 PWM Dimming at 200Hz

S Open-Drain Fault Indicator Output

S LED Open/Short Detection and Protection

S Output Overvoltage and Overtemperature

S Programmable LED Current Foldback at Lower

S 200kHz to 2MHz Resistor Programmable

S Current-Mode Control Switching Stage with

S Enable Input

S Thermally Enhanced, 20-Pin TQFN (4mm x 4mm)

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

*EP = Exposed pad.

/V denotes an automotive qualified part.

MAX16838ATP+

MAX16838ATP/V+

MAX16838AUP+

Current Sinks

Flexibility

Dissipation in Linear Current Sinks

Range

Protection

Input Voltages

Switching Frequency with External

Synchronization

Internal Slope Compensation

and 20-Pin TSSOP Packages

COMP

PART

COMP

4.75V TO 40V

CFB

DRV

DIM

COMP

SGND

MAX16838

-40NC to +125NC

PGND

TEMP RANGE

Ordering Information

Simplified Schematic

DRAIN

LEDGND

NDRV

GATE

OUT1

OUT2

ISET

FLT

ISET

PIN-PACKAGE

20 TQFN-EP*

20 TSSOP-EP*

Features

OUT

LED

STRINGS

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