MAX17061ETI+T【PDF 1/26 页】IC LED DRVR WHITE BCKLGT 28-TQFN

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Sheet目录340

[1页]2页 3页 4页 5页

19-3211; Rev 0; 1/08

ATION

EVALU

AVAILA

KIT

BLE

8-String White LED Driver with

SMBus for LCD Panel Applications

General Description

The MAX17061 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 MAX17061 has a wide input-

voltage range from 4.5V to 26V, and provides a fixed

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

The MAX17061 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 MAX17061’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 MAX17061 has multiple features to protect the con-

troller from fault conditions. Separate feedback loops

limit the output voltage under any circumstance, ensur-

ing safe operation. Once an open string is detected,

Features

o Accurate Dimming Control Using SMBus, PWM

Interface

o Dimming Range with 8-Bit Resolution

o Adjustable DPWM Frequency with 1.5% Accuracy

o Up to Eight Parallel Strings Multiple Series-

Connected LEDs

o ±1.5% Current Regulation Accuracy Between

Strings

o Low String Feedback Voltage: 625mV at 25mA

LED Current

o Full-Scale LED Current Adjustable from 15mA to

30mA, or Preset 25mA

o Open and Short LED Protections

o Output Overvoltage Protection

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

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

o 500kHz/750kHz/1MHz Selectable Switching

Frequency

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

Ordering Information

the string is disabled while other strings operate nor-

mally. The MAX17061 also features short LED detec-

tion. The shorted strings are also disabled after a 2ms

PART

MAX17061ETI+

TEMP RANGE PIN-PACKAGE

-40 o C to +85 o C 28 Thin QFN (4mm x 4mm)

fault blanking interval. The controller features cycle-by-

cycle current limit to provide stable operation and soft-

start capability. If the MAX17061 is in current-limit

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

+Denotes a lead-free package.

Simplified Operating Circuit

internal timer expires. A thermal-shutdown circuit pro-

vides another level of protection.

V IN

V OUT

The MAX17061’s step-up controller features an internal

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

V DD IN

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

limit. This architecture greatly simplifies the external cir-

V CC

ISET

LX1, 2

PGND1, 2

CCV

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

MAX17061 features selectable switching frequency

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

PWM

MAX17061

PWMI

PWMO

FB1

ety of applications that can trade off component size for

operating frequency.

The MAX17061 is available in a thermally enhanced

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

Applications

Notebook, Subnotebook,

Automotive Systems

CLK

DATA

N.C.

GND

OSC

SCL

SDA

FSET

FB2

FB3

FB4

FB5

FB6

FB7

FB8

and Tablet Computer

Displays

Handy Terminals

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

________________________________________________________________ Maxim Integrated Products

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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