MAX17105ETG+T【PDF 1/26 页】IC LED DRVR WHITE BCKLGT 24-TQFN

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Sheet目录340

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EVALUA

AVAILAB

19-4562; Rev 1; 12/09

TION KIT

8-String WLED Driver with Integrated Step-Up

Regulator and SMBus/PWM Dimming Capability

General Description

The MAX17105 is a high-efficiency driver for white-light-

emitting diodes (WLEDs). 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 8 strings in parallel and 10 LEDs per string.

Each string is terminated with ballast that achieves Q 2%

current regulation accuracy, ensuring even LED bright-

ness. The MAX17105 has a wide input voltage range

from 6V to 28V, and provides adjustable 0 to 30mA full-

scale LED current.

The MAX17105 can internally generate a digitally adjusted

pulse-width modulation (DPWM) signal for accurate

WLED dimming control. The DPWM frequency is resis-

tor programmable, while DPWM duty cycle is controlled

directly from an external PWM signal or through a control

word through the MAX17105’s SMBus? interface. This

DPWM control provides a dimming range with 8-bit reso-

lution and supports Intel display power-saving technol-

ogy (DPST) to maximize battery life. The MAX17105 also

has direct PWM control mode, in which the PWMI directly

controls the LED current turn on/off and the SMBus inter-

face is disabled.

The MAX17105 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, the

string is disabled while other strings operate normally.

The MAX17105 also features short LED detection. The

shorted strings are also disabled. The controller features

cycle-by-cycle current limit to provide constant operation

and soft-start capability. If the MAX17105 is in current-

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

Features

S 6V to 28V Input Supply Voltage

S Up to Eight Parallel-String Multiple Series

Connected LEDs

S 500kHz-to-2MHz Adjustable Switching Frequency

S 0.15 I Internal HV Power MOSFET (45V max)

S Low-String Feedback Voltage: 500mV at 20mA

LED current

S Full-Scale LED Current Adjustable from 0mA to

30mA

S Q 2% Current Regulation Accuracy Between Strings

S 100:1 Dimming Ratio at 25kHz Direct PWM

Frequency

S 100Hz to 30kHz PWMI Input Range for DPWM

Mode and 10kHz Q 5% for SMBus Mode

S 100Hz to 5kHz Adjustable DPWM Frequency

S Full-Range Dimming with 8-Bit Resolution

S Open and Short LED Protection

S Output Overvoltage Protection

S Thermal Shutdown

S FAULT Output to Drive p-Channel MOSFET

S Small 24-Pin, 4mm x 4mm, Thin QFN Package

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX17105 ETG+ -40 N C to +85 N C 24 TQFN-EP*

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

* EP = Exposed pad.

Pin Configuration

TOP VIEW

an internal timer expires. A thermal-shutdown circuit

provides another level of protection. When the input over-

current-limit fault, thermal shutdown, or output-voltage

short condition happens, the input p-channel MOSFET

is turned off and the step-up regulator output is isolated

LX 19

PWMI 20

EN 21

FB3

FB2

FB1

from the input supply.

The MAX17105 is available in a thermally enhanced,

24-pin, 4mm x 4mm, thin QFN package with exposed pad.

SCL 22

SDA 23

DFSET 24

MAX17105

SGND

FAULT

Applications

Notebook, Subnotebook,

Automotive Systems

and Tablet Computer

Displays

Handy Terminals

THIN QFN

4mm x 4mm

SMBus is a trademark of Intel Corp.

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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