MAX17127 Maxim Integrated Products, MAX17127 Datasheet

MAX17127

Manufacturer Part Number

MAX17127

Description

Six-String WLED Driver

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX17127.pdf (22 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX17127ETP+

Manufacturer:

Maxim Integrated Products

Quantity:

135

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19-5164; Rev 0; 3/10

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 Q2%

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.

The MAX17127 has multiple features to protect the con-

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

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

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.

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

nal 0.12I (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.

The MAX17127 is available in a thermally enhanced,

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

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.

_______________________________________________________________ Maxim Integrated Products 1

Six-String WLED Driver with Integrated

General Description

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

*EP = Exposed pad.

Simplified Operating Circuit appears at end of data sheet.

MAX17127ETP+

5V to 26V Input Supply Voltage

Up to Six Parallel Strings Multiple Series-

Connected LEDs

250kHz to 1MHz Adjustable Switching Frequency

0.12I Internal HV Power MOSFET (48V max)

Low String Feedback Voltage: 480mV at 20mA

LED Current

Full-Scale LED Current Adjustable from 10mA to

30mA

Q2% Current-Regulation Accuracy Between

Strings

400ns Minimum String On-Time

100Hz to 25kHz PWM Input Range

Open and Short LED Protection

Output Overvoltage Protection

Thermal Shutdown

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

PART

Notebook, Subnotebook, and Tablet Computer

Displays

Automotive Systems

Handy Terminals

Step-Up Converter

-40°C to +85°C

TEMP RANGE

Ordering Information

Applications

PIN-PACKAGE

www.DataSheet4U.com

20 TQFN-EP*

Features

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