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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1698A Datasheet

High-Efficiency Step-Up Current Regulator

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MAX1698A pdf
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19-1621; Rev 2; 2/07
High-Efficiency Step-Up
Current Regulator for LEDs
General Description
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 15sense 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.
Applications
Battery-Powered Backlight Applications
Backlight for LCD Panels
Notebook PCs
Handy Terminals
PDAs
Features
Over 90% Efficiency
Lossless, Adjustable LED Brightness
Space-Saving 10-Pin µMAX Package
Simpler, Lower Cost, More Reliable Compared
to CCFL or EL Backlights
Up to 5W Output Power
Ordering Information
PART
MAX1698EUB
MAX1698AEUB
TEMP RANGE PIN-
PACKAGE
-40°C to +85°C 10µMAX
-40°C to +85°C 10µMAX
PKG
CODE
U10-2
U10-2
TOP VIEW
Pin Configuration
VCC 1
SHDN 2
REF 3
ADJ 4
GND 5
MAX1698
MAX1698A
10 EXT
9 CS
8 PGND
7 GND
6 FB
µMAX
VBATT
L
VCC
ON
OFF
VCC EXT
MAX1698
MAX1698A
SHDN
CS
REF PGND
ADJ
FB
GND
Typical Operating Circuit
D1
VOUT
COUT
ILED
RFB RN
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1698A Datasheet

High-Efficiency Step-Up Current Regulator

No Preview Available !

MAX1698A pdf
High-Efficiency Step-Up
Current Regulator for LEDs
ABSOLUTE MAXIMUM RATINGS
VCC, SHDN to GND ..................................................-0.3V to +6V
EXT, FB, CS, ADJ, REF to GND..................-0.3V to (VCC + 0.3V)
GND to PGND.....................................................................±0.3V
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature Range (soldering, 10s)......................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
Quiescent Supply Current
Undervoltage Lockout
VCC
ICC VFB = 0.3V
Rising edge
2.7 5.5 V
260 500 µA
2.25 2.4 2.55
V
Undervoltage Hysteresis
FB Regulation Voltage
CS Trip Current
ADJ = REF
VFB VADJ = 100mV
FB = GND
MAX1698A
MAX1698
80 mV
285 300 315
mV
18 24 30
2.0 2.4 2.8
0.8 1.5 2.5
A
CS Input Current
Minimum Off Time
Maximum On Time
ADJ Start Threshold
ADJ Input Range
FB Input Bias Current
ADJ Input Bias Current
Shutdown Supply Current
REF Output Voltage
REF Load Regulation
REF Short-Circuit Current
ICS
tOFF(MIN)
tON(MAX)
FB = GND, ADJ = REF
FB = GND, ADJ = REF, CS = GND
VADJ
IFB
IADJ
VREF
VREF
VFB = 300mV
ADJ = REF
SHDN = GND
IREF = 0
IREF = 0 to 150µA
REF = GND
0.8
10
30
0.03
-15
-50
1.20
1.0
15
50
0.01
1.25
-2
0.45
0.8 ARMS
1.2 µs
20 µs
70 mV
REF V
15 nA
50 nA
1 µA
1.30 V
-25 mV
1 mA
REF Power-Supply Rejection
Ratio
PSRR VCC = 2.7V to 5.5V
+0.3
+2 mV/V
EXT Driver Sink/Source Current
EXT Driver On-Resistance
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN Input Bias Current
VIH
VIL
I SHDN
VCC = 5V, EXT = 2V
VCC = 5V
VCC = 2.7V to 5.5V
VCC = 2.7V to 5.5V
VCC = 2.7V to 5.5V
0.2 A
8
2V
0.8 V
-1 1 µA
2 _______________________________________________________________________________________


Part Number MAX1698A
Description High-Efficiency Step-Up Current Regulator
Maker Maxim Integrated Products
Total Page 8 Pages
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