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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1698 Datasheet

High-Efficiency Step-Up Current Regulator for LEDs

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MAX1698 pdf
19-1621; Rev 0; 1/00
EVAALVUAAILTAIOBNLEKIT
High-Efficiency Step-Up
Current Regulator for LEDs
General Description
The MAX1698 is the most efficient driver for white or
color LEDs. The device is ideal for LED backlit displays
in PDAs and digital cameras, and can also be used for
larger displays like those in laptop computers. Its
numerous benefits include greater simplicity, lower
cost, higher efficiency, longer bulb life, and greater reli-
ability when compared to fluorescent (CCFL) and elec-
troluminescent (EL) lamps.
The MAX1698 is a switch-mode boost controller in
which LED current, rather than output voltage, provides
the feedback signal. It can operate with battery inputs
as low as 0.8V. The device drives series-connected
LEDs with a controlled current that is measured at a
sense resistor connected at the feedback pin. The
required sense resistor is typically 15, not an expen-
sive fractional-ohm value. LED current control and dim-
ming are accomplished with an adjust input (ADJ), not
with lossy current-limiting resistors. For larger light out-
put, multiple LED banks can be connected in parallel
with up to 5W total output power.
The MAX1698 is 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
Cell Phones
Handy Terminals
PDAs
Features
o Over 90% Efficiency
o Lossless, Adjustable LED Brightness
o Space-Saving 10-Pin µMAX Package
o Simpler, Lower Cost, More Reliable Compared
to CCFL or EL Backlights
o Up to 5W Output Power
PART
MAX1698EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
TOP VIEW
Pin Configuration
VCC 1
SHDN 2
REF 3
ADJ 4
GND 5
MAX1698
µMAX
10 EXT
9 CS
8 PGND
7 GND
6 FB
Typical Operating Circuit
VBATT
L
VCC VCC
EXT
ON MAX1698
OFF
SHDN
CS
REF PGND
ADJ
FB
GND
D1
ILED
RFB RN
VOUT
COUT
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1698 Datasheet

High-Efficiency Step-Up Current Regulator for LEDs

No Preview Available !

MAX1698 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
Supply Voltage
Quiescent Supply Current
Undervoltage Lockout
VCC
ICC VFB = 0.3V
Rising edge
Undervoltage Hysteresis
FB Regulation Voltage
CS Trip Current
ADJ = REF
VFB VADJ = 100mV
FB = GND
CS Input Current
Minimum Off Time
Maximum On Time
ADJ Start Threshold
ICS
tOFF(MIN)
tON(MAX)
FB = GND, ADJ = REF
FB = GND, ADJ = REF, CS = GND
ADJ Input Range
FB Input Bias Current
ADJ Input Bias Current
Shutdown Supply Current
REF Output Voltage
REF Load Regulation
REF Short-Circuit Current
VADJ
IFB
IADJ
VREF
VREF
VFB = 300mV
ADJ = REF
SHDN = GND
IREF = 0
IREF = 0 to 150µA
REF = GND
REF Power-Supply Rejection
Ratio
PSRR VCC = 2.7V to 5.5V
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
MIN
2.7
2.25
285
18
0.8
0.8
10
30
0.03
-15
-50
1.20
2
-1
TYP
260
2.4
80
300
24
1.5
1.0
15
50
0.01
1.25
-2
0.45
+0.3
0.2
MAX
5.5
500
2.55
315
30
2.5
0.8
1.2
20
70
REF
15
50
1
1.30
-25
1
UNITS
V
µA
V
mV
mV
A
ARMS
µs
µs
mV
V
nA
nA
µA
V
mV
mA
+2 mV/V
A
8
V
0.8 V
1 µA
2 _______________________________________________________________________________________


Part Number MAX1698
Description High-Efficiency Step-Up Current Regulator for LEDs
Maker Maxim
Total Page 8 Pages
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