MAX17127ETP+【PDF 1/22 页】IC WLED DVR SIX STRING 20TQFN

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Sheet目录340

[1页]2页 3页 4页 5页

EVALUA

AVAILAB

19-5164; Rev 0; 3/10

TION KIT

Six-String WLED Driver with Integrated

Step-Up Converter

General Description

The MAX17127 is a high-efficiency driver for white light-

emitting diodes (LEDs). It is designed for large liquid-

crystal displays (LCDs) that employ an array of LEDs as

the light source. An internal switch current-mode step-up

converter drives the LED array, which can be configured

for up to six strings in parallel and 13 LEDs per string.

Each string is terminated with ballast that achieves Q 2%

current-regulation accuracy, ensuring even LED bright-

ness. The MAX17127 has a wide input voltage range

from 5V to 26V, and provides adjustable 10mA to 30mA

full-scale LED current.

The MAX17127 can implement brightness control through

the PWM signal input, and LED current is directly con-

trolled by the external dimming signal’s frequency and

duty cycle.

Features

S 5V to 26V Input Supply Voltage

S Up to Six Parallel Strings Multiple Series-

Connected LEDs

S 250kHz to 1MHz Adjustable Switching Frequency

S 0.12 I Internal HV Power MOSFET (48V max)

S Low String Feedback Voltage: 480mV at 20mA

LED Current

S Full-Scale LED Current Adjustable from 10mA to

30mA

S Q 2% Current-Regulation Accuracy Between

Strings

S 400ns Minimum String On-Time

S 100Hz to 25kHz PWM Input Range

S Open and Short LED Protection

The MAX17127 has multiple features to protect the con-

troller from fault conditions. Once an open/short string is

Output Overvoltage Protection

Thermal Shutdown

detected, the fault string is disabled while other strings

can still operate normally. The controller features cycle-

by-cycle current limit to provide constant operation and

S Small 20-Pin, 4mm x 4mm Thin QFN Package

soft-start capability. If the MAX17127 is in current-limit

condition, the step-up converter is latched off after an

internal timer expires. A thermal-shutdown circuit pro-

vides another level of protection. When thermal shut-

down happens, the MAX17127 is latched off.

PART

MAX17127ETP+

Ordering Information

TEMP RANGE PIN-PACKAGE

-40°C to +85°C 20 TQFN-EP*

The MAX17127’s step-up controller features an inter-

nal 0.12 I (typ), 48V (max) power MOSFET with local

current-sense amplifier for accurate cycle-by-cycle cur-

rent limit. This architecture greatly simplifies the external

circuitry and saves PCB space. Low-feedback volt-

age at each LED string helps reduce power loss and

improve efficiency. The MAX17127 features resistor-

adjustable switching frequency from 250kHz to 1MHz,

which enables a wide variety of applications that can

trade off component size for operating frequency.

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

* EP = Exposed pad.

Applications

Notebook, Subnotebook, and Tablet Computer

Displays

Automotive Systems

Handy Terminals

The MAX17127 is available in a thermally enhanced,

lead-free, 20-pin, 4mm x 4mm thin QFN package.

Simplified Operating Circuit appears 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.

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