MAX17061ETI+ Maxim Integrated Products, MAX17061ETI+ Datasheet

MAX17061ETI+

Manufacturer Part Number

MAX17061ETI+

Description

IC LED DRVR WHITE BCKLGT 28-TQFN

Manufacturer

Maxim Integrated Products

Type

Backlight, White LEDr

Datasheet

1.MAX17061ETI.pdf (26 pages)

Specifications of MAX17061ETI+

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Automotive, Backlight

Type - Secondary

White LED

Frequency

1MHz

Voltage - Supply

4.5 V ~ 26 V

Voltage - Output

Mounting Type

Surface Mount

Package / Case

28-TQFN Exposed Pad

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

30mA

Internal Switch(s)

Yes

Operating Supply Voltage

5 V

Maximum Supply Current

2 mA

Maximum Power Dissipation

1667 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Efficiency

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 26
Download datasheet (420Kb)

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,

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

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

internal timer expires. A thermal-shutdown circuit pro-

vides another level of protection.

The MAX17061’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

MAX17061 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 MAX17061 is available in a thermally enhanced

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

19-3211; Rev 0; 1/08

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-free package.

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

MAX17061ETI+

PWM

DATA

CLK

Interface

Connected LEDs

Strings

LED Current

30mA, or Preset 25mA

Frequency

PART

N.C.

ISET

CCV

PWMI

PWMO

GND

OSC

SCL

SDA

FSET

Simplified Operating Circuit

MAX17061

PGND1, 2

LX1, 2

FB2

FB3

FB4

FB5

FB6

FB7

FB8

FB1

TEMP RANGE PIN-PACKAGE

-40

C to +85

Ordering Information

C 28 Thin QFN (4mm x 4mm)

OUT

Features

Related parts for MAX17061ETI+

MAX17061ETI+ Summary of contents

Page 1

... Preset 25mA 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 Frequency o Small 28-Pin, 4mm x 4mm, Thin QFN package PART MAX17061ETI+ + Denotes a lead-free package ISET CCV PWM ...

Page 2

White LED Driver with SMBus for LCD Panel Applications ABSOLUTE MAXIMUM RATINGS IN to GND ..............................................................-0.3V to +28V FB_, LX_ to GND ....................................................-0.3V to +45V PGND_ to GND......................................................-0.3V to +0. PWMI, SDA, SCL to GND ...

Page 3

SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V CCV T = 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER INPUT LEAKAGE PWMI Leakage Current ISET, FSET ...

Page 4

White LED Driver with SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V CCV T = 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER PWM FILTER ...

Page 5

SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V CCV T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER BOOST CONVERTER LX On-Resistance 20mA from LX_ ...

Page 6

White LED Driver with SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V CCV T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER FAULT PROTECTION ...

Page 7

SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (BRIGHTNESS = 100%) ...

Page 8

White LED Driver with SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A SWITCHING WAVEFORMS (V = ...

Page 9

SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A LED-OPEN FAULT PROTECTION (BRIGHTNESS = 100%, LED OPEN ON ...

Page 10

White LED Driver with SMBus for LCD Panel Applications PIN NAME LED String 3 Cathode Connection. FB3 is the open-drain output of an internal regulator, which controls 1 FB3 current through FB3. FB3 can sink up to 30mA. If ...

Page 11

SMBus for LCD Panel Applications PIN NAME 22 V Boost Reg ul ator ate Byp ass Linear Regulator Output capacitor ...

Page 12

White LED Driver with SMBus for LCD Panel Applications The MAX17061 includes a 5V linear regulator that pro- vides the internal bias and gate drive for the step-up controller. When an external 5V is available, the internal LDO can ...

Page 13

SMBus for LCD Panel Applications IN 5V LINEAR REGULATOR OSCILLATOR 3-LEVEL OSC COMPARATOR CCV REF ADJ ISET FSET PWMO "< = 1" A PWMI D "1" DIMMING 0x03 BLOCK DIAGRAM SDA SCL Figure 2. Control Circuit ...

Page 14

White LED Driver with SMBus for LCD Panel Applications The MAX17061 includes power-on reset (POR) and undervoltage lockout (UVLO) features. POR resets the fault latch and sets all the SMBus registers to their POR values. POR occurs when V ...

Page 15

SMBus for LCD Panel Applications Table 1. Frequency Selection OSC PIN CONNECTION SWITCHING FREQUENCY (kHz) GND Open V CC Frequency Selection A tri-level OSC input sets the internal oscillator frequen- cy for step-up converter, as shown in Table 1. High-fre- ...

Page 16

White LED Driver with SMBus for LCD Panel Applications DPWM DPWM t DPWM I LEDMAX I LED 0A Figure 4. LED Current Control by DPWM Signal in Dimming Full-Scale ...

Page 17

... PWMI interface is used for brightness control; the MAX17061 cannot run without the SMBus interface. For sister products without the SMBus interface, contact MAXIM Integrated Products, Inc. Dimming Control Register Descriptions The MAX17061 includes four registers to monitor and control brightness, fault status, identification, and oper- ating mode. The slave address is 0b0101100. Brightness control register: Address is 0x00. This register is both readable and writable for all 8 bits, BRT0– ...

Page 18

White LED Driver with SMBus for LCD Panel Applications Table 2. Operating Modes Selected by Device Control Register Bits 1 and 2 PWM_MD PWM_SEL Fault/Status Register: Address is 0x02. This register has 6 ...

Page 19

SMBus for LCD Panel Applications The list of ID values for vendors is shown in Table 3. Thermal Shutdown The MAX17061 includes a thermal-protection circuit. When the local IC temperature exceeds +160°C (typ), the controller and current sources shut down ...

Page 20

White LED Driver with SMBus for LCD Panel Applications To ensure the stable operation, the MAX17061 includes slope compensation, which sets the minimum inductor value. In continuous-conduction mode (CCM), the mini- mum inductor value is calculated with the following ...

Page 21

SMBus for LCD Panel Applications The equations used here include a constant LIR, which is the ratio of the inductor peak-to-peak ripple current to the average DC inductor current at the full load cur- rent. The controller operates in DCM ...

Page 22

White LED Driver with SMBus for LCD Panel Applications The peak-inductor current at minimum input voltage is calculated as follows: 100 PEAK ...

Page 23

SMBus for LCD Panel Applications LED Selection and Bias The series/parallel configuration of the LED load and the full-scale bias current have a significant effect or regula- tor performance. LED characteristics vary significantly from manufacturer to manufacturer. Consult the respec- ...

Page 24

... LX node from one side of the PCB to the other. Use DC traces as shield if necessary. Refer to the MAX17061 evaluation kit for an example of proper board layout. 24 ______________________________________________________________________________________ Pin Configuration TOP VIEW CCV 25 OV MAX17061ETI+ ISET 26 FB1 27 28 FB2 THIN QFN 4mm x 4mm Chip Information TRANSISTOR COUNT: 21,800 PROCESS: BiCMOS SDA 13 FSET ...

Page 25

SMBus for LCD Panel Applications (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ 8-String White LED Driver with Package Information 25 ...

Page 26

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 26 © 2008 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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