MAX1698EUB+ Maxim Integrated Products, MAX1698EUB+ Datasheet

MAX1698EUB+

Manufacturer Part Number

MAX1698EUB+

Description

IC LED DRVR WT/CLR BCKLGT 10MSOP

Manufacturer

Maxim Integrated Products

Type

Backlight, White LED, Color LEDr

Datasheet

1.MAX1698EUB.pdf (8 pages)

Specifications of MAX1698EUB+

Topology

Step-Up (Boost)

Number Of Outputs

Internal Driver

Type - Primary

Backlight

Type - Secondary

White LED

Voltage - Supply

2.7 V ~ 5.5 V

Mounting Type

Surface Mount

Package / Case

10-MSOP, Micro10™, 10-uMAX, 10-uSOP

Operating Temperature

-40°C ~ 85°C

Internal Switch(s)

Yes

Efficiency

90%

Low Level Output Current

200000 uA (Typ)

High Level Output Current

200000 uA (Typ)

Operating Supply Voltage

2.7 V to 5.5 V

Maximum Supply Current

500 uA

Maximum Power Dissipation

444 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Frequency

Current - Output / Channel

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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The MAX1698 and MAX1698A are efficient drivers for

white or color LEDs. They are ideal for large LED backlit

displays in PDAs and laptop computers. Numerous

benefits include greater simplicity, lower cost, higher

efficiency, longer bulb life, and greater reliability when

compared to fluorescent (CCFL) and electrolumines-

cent (EL) lamps.

The MAX1698/MAX1698A are switch-mode boost con-

trollers in which LED current, rather than output voltage,

is regulated The devices drive series-connected LEDs

with a controlled current that is measured with a typical-

ly 15Ω sense resistor, not an expensive fractional-ohm

value. LED current control and dimming are accom-

plished with an adjust input (ADJ). For larger light out-

put, multiple LED banks can be connected in parallel

with up to 5W total output power.

The MAX1698A has a higher, and more accurately

specified, CS current limit than the MAX1698 for higher-

power applications of 5W or more. Both devices are

supplied in a space-saving 10-pin µMAX package that

occupies half the space of an 8-pin SO. An evaluation

kit (MAX1698EVKIT) is available to speed designs.

19-1621; Rev 2; 2/07

For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Battery-Powered Backlight Applications

Backlight for LCD Panels

Notebook PCs

Handy Terminals

PDAs

OFF

________________________________________________________________ Maxim Integrated Products

BATT

General Description

SHDN

REF

ADJ

GND

MAX1698A

MAX1698

Applications

PGND

EXT

Current Regulator for LEDs

High-Efficiency Step-Up

♦ Over 90% Efficiency

♦ Lossless, Adjustable LED Brightness

♦ Space-Saving 10-Pin µMAX Package

♦ Simpler, Lower Cost, More Reliable Compared

♦ Up to 5W Output Power

MAX1698EUB

MAX1698AEUB

to CCFL or EL Backlights

PART

TOP VIEW

SHDN

LED

GND

REF

ADJ

Typical Operating Circuit

-40°C to +85°C 10µMAX

T EM P RA N G E

Ordering Information

MAX1698A

MAX1698

µMAX

Pin Configuration

PIN -

PA C K A G E

OUT

EXT

PGND

GND

OUT

Features

CODE

U10-2

PKG

Related parts for MAX1698EUB+

MAX1698EUB+ Summary of contents

Page 1

... ON MAX1698A SHDN OFF REF ADJ GND ________________________________________________________________ Maxim Integrated Products For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. High-Efficiency Step-Up Current Regulator for LEDs ♦ Over 90% Efficiency ♦ Lossless, Adjustable LED Brightness ♦ Space-Saving 10-Pin µMAX Package ♦ ...

Page 2

High-Efficiency Step-Up Current Regulator for LEDs ABSOLUTE MAXIMUM RATINGS , SHDN to GND ..................................................-0. EXT, FB, CS, ADJ, REF to GND..................-0. GND to PGND.....................................................................±0.3V Continuous Power Dissipation (T = +70°C) A 10-Pin µMAX (derate ...

Page 3

ELECTRICAL CHARACTERISTICS = +3.3V -40°C to +85°C, unless otherwise noted.) (Note PARAMETER SYMBOL Supply Voltage V CC Quiescent Supply Current I CC Undervoltage Lockout FB Regulation Voltage V CS Trip Current Minimum Off Time ...

Page 4

High-Efficiency Step-Up Current Regulator for LEDs (Circuit of Figure 3.3V BATT OUTPUT CURRENT vs. V AND V BATT CC 25 vs. V BATT 20 vs CHAIN OF ...

Page 5

PIN NAME Supply Voltage Input. Power for internal circuitry. Input range is 2.7V to 5.5V. CC Active-Low Shutdown Input. In shutdown, the MOSFET turns off, but a current path still exists between the SHDN 2 input and ...

Page 6

High-Efficiency Step-Up Current Regulator for LEDs V = 3.3V BATT 10µ 3. 1µF MAX1698 MAX1698A SHDN REF ADJ GND Figure 2. Typical Operating Circuit Detailed Description The MAX1698/MAX1698As' high efficiency and small size make them ...

Page 7

REF ADJ MAX1698 MAX1698A GND Figure 3. Adjusting LED Current shows the standard method of setting the ADJ voltage. Use the following equation to determine I V ADJ I = LED ⋅ where V is ...

Page 8

... 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products ...

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