MAX1698EUB-T Maxim Integrated Products, MAX1698EUB-T Datasheet

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MAX1698EUB-T

Manufacturer Part Number
MAX1698EUB-T
Description
LED Drivers High-Efficiency Step -Up Current Controll
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1698EUB.pdf (8 pages)

Specifications of MAX1698EUB-T

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 Power Dissipation
444 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
uSOP
Minimum Operating Temperature
- 40 C

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MAX1698EUB-TG096
Manufacturer:
MAX
Quantity:
3 300
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
V
BATT
V
CC
ON
General Description
V
SHDN
REF
ADJ
GND
CC
MAX1698A
MAX1698
L
Applications
PGND
EXT
CS
FB
Current Regulator for LEDs
D1
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
R
FB
SHDN
I
LED
GND
V
REF
ADJ
Typical Operating Circuit
CC
-40°C to +85°C 10µMAX
-40°C to +85°C 10µMAX
T EM P RA N G E
1
2
3
4
5
R
N
Ordering Information
MAX1698A
MAX1698
µMAX
Pin Configuration
PIN -
PA C K A G E
10
9
8
7
6
C
OUT
EXT
CS
PGND
GND
FB
V
OUT
Features
CODE
U10-2
U10-2
PKG
1

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MAX1698EUB-T Summary of contents

Page 1

... 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 ♦ Simpler, Lower Cost, More Reliable Compared to CCFL or EL Backlights ♦ Output Power PART MAX1698EUB MAX1698AEUB TOP VIEW Applications D1 EXT CS PGND FB R ...

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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