MAX17149ETE+【PDF 1/21 页】IC LED DRVR 6CH STEP UP 16QFNEP

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Sheet目录340

[1页]2页 3页 4页 5页

19-5676; Rev 1; 9/11

EVALUA

TION KIT

AVA ILABLE

Low-Cost, 6-String WLED Drivers with

Quick-PWM Step-Up Converter

General Description

The MAX17129/MAX17149 are high-efficiency drivers

for white LEDs. They are designed for small- to medium-

sized LCDs that employ an array of LEDs as the light

source. An internal switch step-up controller with Quick-

PWM K drives the LED array, which can be configured for

up to 6 strings in parallel and either 11 LEDs (MAX17129)

or 6 LEDs in series (MAX17149) per string. Each string

is terminated with a ballast that achieves Q 2% current-

regulation accuracy, ensuring even LED brightness and

provides an adjustable 10mA to 45mA full-scale LED

current. The devices have a wide input voltage range of

6V to 26V. The MAX17129 integrates an LDO to simplify

applications that have a single high-voltage supply. The

devices also feature a low-input-voltage mode for appli-

cations that have a 3V to 5.5V supply voltage.

The devices support both PWM and hybrid dimming

mode. In PWM dimming mode, the external PWM signal

directly controls the brightness of LEDs. The dimming

frequency ranges from 100Hz to 25kHz with 400ns mini-

mum on-time. In hybrid dimming mode, the LED current

amplitude can be adjusted to 25% of full-scale LED cur-

rent to improve system efficiency when brightness is low.

The devices have multiple features to protect the con-

troller from fault conditions. Separate voltage-feedback

loops limit the output voltage to safe operation. The open

and short-LED detection shuts down the faulty string

while keeping other strings operating normally.

The devices feature cycle-by-cycle current limit on the

internal switch to provide consistent operation and soft-

start capability. If the devices are in current-limit condi-

tion, the step-up converter is latched off after an internal

timer expires. A thermal-shutdown circuit provides anoth-

Features

S 3V to 26V Input Supply Voltage

S Up to Six Parallel Strings of Multiple Series-

Connected LEDs

S Step-Up Regulator with Quick-PWM Control Scheme

S Two-Level Selectable Switching Frequency

S 0.25 I Internal HV Power MOSFET (48V max)

S Low String Feedback Voltage: 275mV at 20mA

LED Current

S Full-Scale LED Current Adjustable from 10mA to

45mA

S ±2% Current Regulation Accuracy Between Strings

S Support PWM and Hybrid Dimming Mode

S 100:1 Dimming Ratio

S 100Hz to 25kHz Dimming Frequency for PWM

Dimming Mode

S Open and Short LED Protection

S Output Overvoltage Protection

S Small 16-Pin, 3mm x 3mm Thin QFN Package

Applications

Notebook, Subnotebook, and Tablet Computer

Displays

Automotive Systems

Handy Terminals

Ordering Information

er level of protection and prevents ICs from damage.

The ICs’ step-up controller features an internal 0.25 I (typ),

PART

MAX17129 ETE +

TEMP RANGE

-40 ° C to +85 ° C

PIN-PACKAGE

16 Thin QFN-EP*

48V (max) power MOSFET with lossless current sense and

accurate cycle-by-cycle current limit. The Quick-PWM con-

trol architecture provides fast load-transient response with-

out requiring an external loop compensation component,

simplifies the external circuitry, and saves board area. The

Quick-PWM control scheme has constant off-time and

adjustable pseudo-fixed frequency, which enables a wide

variety of applications that can trade off component size

for operating frequency. Low feedback voltage at each

LED string (275mV typ at 20mA LED current) helps reduce

power loss and improve efficiency.

The ICs are available in a 16-pin, thin QFN package with

0.5mm lead spacing. The package is 3mm x 3mm with a

maximum thickness of 0.8mm for ultra-thin LCD panel design.

MAX17149 ETE+ -40 ° C to +85 ° C 16 Thin QFN-EP*

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

* EP = Exposed pad.

Simplified Operating Circuit appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

_______________________________________________________________ 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.

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