MAX17061A Maxim Integrated Products, MAX17061A Datasheet

MAX17061A

Manufacturer Part Number

MAX17061A

Description

8-String White LED Driver

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX17061A.pdf (24 pages)

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Meier Automation Equipment Co., Limited

Part Number:

MAX17061AETI+

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MAXIM/美信

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The MAX17061A 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

controller drives the LED array, which can be configured

for up to eight strings in parallel and 10 LEDs per string.

Each string is terminated with ballast that achieves ±1.5%

current-regulation accuracy between strings, ensuring

even LED brightness. The MAX17061A has a wide input-

voltage range from 7.5V to 26V, and provides a fixed

25mA or adjustable 15mA to 30mA full-scale LED current.

The MAX17061A internally generates a DPWM signal for

accurate WLED dimming control. The DPWM frequency

is resistor programmable, while DPWM duty cycle is con-

trolled directly from an external PWM signal or through a

control word through the MAX17061A’s SMBus™ inter-

face. This DPWM control provides a dimming range with

8-bit resolution and supports Intel display-power-saving

technology (DPST) to maximize battery life.

The MAX17061A has multiple features to protect the

controller from fault conditions. Separate feedback

loops limit the output voltage under any circumstance,

ensuring safe operation. Once an open string is detect-

ed, the string is disabled while other strings operate

normally. The MAX17061A also features short LED

detection. The shorted strings are also disabled after a

2ms fault blanking interval. The controller features

cycle-by-cycle current limit to provide stable operation

and soft-start capability. If the MAX17061A is in current-

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

an internal timer expires. A thermal-shutdown circuit

provides another level of protection.

The MAX17061A’s step-up controller features an internal

150mΩ (typ), 45V (max) power MOSFET with local cur-

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

limit. This architecture greatly simplifies the external cir-

cuitry and saves PCB space. Low-feedback voltage at

each LED string 625mV (typ) at 25mA LED current helps

reduce power loss and improve efficiency. The

MAX17061A features selectable switching frequency

(500kHz, 750kHz, or 1MHz), which enables a wide vari-

ety of applications that can trade off component size for

operating frequency.

The MAX17061A is available in a thermally enhanced

28-pin, 4mm x 4mm Thin QFN package.

19-4485; Rev 0; 2/09

Notebook, Subnotebook,

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.

and Tablet Computer

Displays

________________________________________________________________ Maxim Integrated Products

General Description

Automotive Systems

Handy Terminals

SMBus for LCD Panel Applications

Applications

8-String White LED Driver with

o Accurate Dimming Control Using SMBus, PWM

o Dimming Range with 8-Bit Resolution

o Adjustable DPWM Frequency with 1.5% Accuracy

o Up to Eight Parallel Strings Multiple Series-

o ±1.5% Current Regulation Accuracy Between

o Low String Feedback Voltage: 625mV at 25mA

o Full-Scale LED Current Adjustable from 15mA to

o Open and Short LED Protections

o Output Overvoltage Protection

o 0.15Ω Internal HV Power MOSFET (45V max)

o Wide Input-Voltage Range from 4.5V to 26V

o 500kHz/750kHz/1MHz Selectable Switching

o Small 28-Pin, 4mm x 4mm, Thin QFN package

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

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

MAX17061AETI+

PWM

DATA

CLK

Interface

Connected LEDs

Strings

LED Current

30mA, or Preset 25mA

Frequency

N.C.

PART

ISET

CCV

PWMI

PWMO

GND

OSC

SCL

SDA

FSET

MAX17061A

Simplified Operating Circuit

PGND1, 2

LX1, 2

FB2

FB3

FB4

FB5

FB6

FB7

FB8

FB1

TEMP RANGE

-40

Ordering Information

C to +85

PIN-PACKAGE

OUT

28 Thin QFN

Features

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