MAX1553ETA+T Maxim Integrated Products, MAX1553ETA+T Datasheet

IC LED DRIVR WHITE BCKLGT 8-TDFN

MAX1553ETA+T

Manufacturer Part Number
MAX1553ETA+T
Description
IC LED DRIVR WHITE BCKLGT 8-TDFN
Manufacturer
Maxim Integrated Products
Type
Backlight, White LEDr
Datasheets
1.MAX1551EZKT.pdf (8 pages)
2.MAX1553ETAT.pdf (11 pages)

Specifications of MAX1553ETA+T

Constant Current
Yes
Topology
PWM, Step-Up (Boost)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Voltage - Supply
2.7 V ~ 5.5 V
Voltage - Output
40V
Mounting Type
Surface Mount
Package / Case
8-TDFN Exposed Pad
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
480mA
Internal Switch(s)
Yes
Number Of Segments
10
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Power Dissipation
1951 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Efficiency
-
Lead Free Status / Rohs Status
 Details
The MAX1553/MAX1554 drive white LEDs in series with
a constant current to provide efficient display backlight-
ing in cellular phones, PDAs, and other hand-held
devices. The step-up converter includes an internal
40V, low R
efficiency and maximum battery life. The MAX1553 has
a current limit of 480mA for driving two to six white
LEDs, while the MAX1554 has a current limit of 970mA
for driving up to 10 white LEDs.
A single analog/PWM Dual Mode input provides two
simple means of brightness adjustment. A separate
enable input provides on/off control. Soft-start minimizes
inrush current during startup.
The MAX1553/MAX1554 are available in space-saving
8-pin TDFN 3mm x 3mm packages.
19-2875; Rev 1; 12/03
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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.
DC CONTROL
2.7V TO 5.5V
PWM
Cellular Phones
PDA, Palmtop, and Wireless Handhelds
Color Display Backlight
OR
INPUT
DSON
OFF
ON
Typical Operating Circuit
, N-channel MOSFET switch for high
________________________________________________________________ Maxim Integrated Products
V
SS
EN
BRT
CC
MAX1553
MAX1554
General Description
GND
LX
OV
FB
Converters for 2 to 10 White LEDs
Applications
High-Efficiency, 40V Step-Up
WHITE
LEDS
M A X1 5 5 3 E TA
M A X1 5 5 4 E TA
Constant-Current Regulation for Even LED
Illumination
Internal 40V MOSFET Switch Capable of Driving
10 LEDs
Small, Low-Profile External Components
2.7V to 5.5V Input Range
Up to 88% Efficiency Driving 6 LEDs
Up to 82% Efficiency Driving 9 LEDs
(20mA, V
Analog or PWM Control of LED Intensity
Optimized for Low Input Ripple
Soft-Start to Minimize Inrush Current
3mm x 3mm 8-Pin TDFN Package
PART
TOP VIEW
CC
GND
V
BRT
-40°C to +85°C 8 TD FN 3m m x 3m m
-40°C to +85°C 8 TD FN 3m m x 3m m
EN
TEMP RANGE
CC
= 3.6V)
1
2
3
4
Ordering Information
3mm x 3mm
MAX1553
MAX1554
TDFN
Pin Configuration
PIN-PACKAGE
8
7
6
5
LX
0V
SS
FB
Features
MARK
AGX
AGY
TOP
1

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MAX1553ETA+T Summary of contents

Page 1

... Soft-start minimizes inrush current during startup. The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages. Cellular Phones PDA, Palmtop, and Wireless Handhelds Color Display Backlight Dual Mode is a trademark of Maxim Integrated Products, Inc. Typical Operating Circuit 2.7V TO 5.5V INPUT ...

Page 2

High-Efficiency, 40V Step-Up Converters for White LEDs ABSOLUTE MAXIMUM RATINGS GND..............................................-0.3V to +6. GND ..............................................................-0.3V to +45V EN, BRT GND...................................-0. ...................................................................................0.9A LX Continuous Power ...

Page 3

Converters for White LEDs ELECTRICAL CHARACTERISTICS (continued 3.3V 0V 1µ OUT SENSE PARAMETER LX Current Limit LX Leakage Current SHUTDOWN CONTROL EN Logic-Level High EN Logic-Level Low EN ...

Page 4

High-Efficiency, 40V Step-Up Converters for White LEDs (MAX1553 driving six white LEDs EFFICIENCY vs. LOAD CURRENT DRIVING 6 WHITE LEDS 100 ...

Page 5

Converters for White LEDs (MAX1553 driving six white LEDs SWITCHING WAVEFORMS (CONTINUOUS OPERATION, 3.75V Li+ BATTERY, 18mA OUTPUT OUT I L 2µs/div L1 = 47µH, 4700pF CAPACITOR ACROSS LEDs STARTUP/SHUTDOWN WAVEFORMS V ...

Page 6

High-Efficiency, 40V Step-Up Converters for White LEDs PIN NAME 1 GND Ground 2 V Voltage-Supply Input. 2.7V to 5.5V. The IC is powered from Enable Input. Drive high or connect to V Brightness-Control ...

Page 7

Converters for White LEDs V CC ENABLE EN CONTROL CIRCUITRY UVLO 1.25V BANDGAP REFERENCE BIAS GENERATOR COMPARATOR OV REF L1 D1 47µH CMDSH2-3 TOKO A920CY-470M 2.7V TO 5.5V INPUT C1 C2 4.7µF 0.47µ 25V ...

Page 8

High-Efficiency, 40V Step-Up Converters for White LEDs Adjusting the LED Current Adjusting the output current changes the brightness of the LEDs. The LED current is set by the voltage at BRT (V ) and the sense resistor ...

Page 9

Converters for White LEDs Table 1. Component Suppliers SUPPLIER PHONE Central 631-435-1110 www.centralsemi.com Semiconductor Kamaya 260-489-1533 www.kamaya.com Murata 814-237-1431 www.murata.com Nichia 248-352-6575 www.nichia.com Panasonic 714-373-7939 www.panasonic.com Sumida 847-956-0666 www.sumida.com Taiyo Yuden 408-573-4150 www.t-yuden.com TDK 847-803-6100 www.component.tdk.com TOKO ...

Page 10

High-Efficiency, 40V Step-Up Converters for White LEDs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages PIN 1 INDEX AREA NUMBER ...

Page 11

... 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 ____________________ 11 © 2003 Maxim Integrated Products ...

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