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LT3498
20mA LED Driver and
OLED Driver with Integrated
Schottky in 3mm x 2mm DFN
FEATURES
DESCRIPTION
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Dual Output Boost for Dual Display Devices
Drives Up to Six White LEDs and OLED/LCD Bias
Internal Power Switches and Schottky Diodes
Independent Dimming and Shutdown
200mV High Side Sense on LED Driver Allows
“One-Wire Current Source”
Wide Input Voltage Range: 2.5V to 12V
Wide Output Voltage Range: Up to 32V
2.3MHz PWM Frequency for LED Driver
PFM for OLED Driver is Non-Audible Over Entire
Load Range
Open LED Protection (27V Maximum on CAP1 Pin)
OLED Output Disconnect
Available in 12-Pin DFN Package
1mm Tall Solution Height
The LT ? 3498 is a dual output boost converter featuring a
2.3MHz PWM LED Driver and PFM OLED Driver. It includes
an internal power switch and Schottky diode for each
driver. Both converters can be independently shut down
and modulated. This highly integrated power solution is
ideal for dual display electronic devices.
The 2.3MHz step-up converter is designed to drive up to six
white LEDs in series from a Li-Ion cell. The device features
a unique high side LED current sense that enables the part
to function as a “one-wire” current source —one side of the
LED string can be returned to ground anywhere. Traditional
LED drivers use a grounded resistor to sense LED current,
requiring a 2-wire connection to the LED string.
The PFM OLED driver is a low noise boost converter that
features a novel control technique.* The converter controls
APPLICATIONS
power delivery by varying both the peak inductor current
and switch off time. This technique results in low output
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Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
voltage ripple, as well as, high ef?ciency over a wide load
range. The off time of the switch is not allowed to exceed a
?xed level, guaranteeing a switching frequency that stays
above the audio band.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Patent Pending
TYPICAL APPLICATION
Li-Ion to Six White LEDs and OLED/LCD Bias
OLED Ef?ciency
V IN = 3V TO 5V
4.7 μ F
0.47 μ F
80
75
V IN = 3.6V
V OUT2 = 16V
400
350
1 μ F
10Ω
CAP1 SW1
15 μ H
15 μ H
V IN
LT3498
SW2 CAP2 V OUT2
16V
24mA
10 μ F
70
65
60
LOAD FROM V OUT2
300
250
200
LED1
CTRL1
GND1
GND2
CTRL2
FB2
2.21MΩ
55
150
20mA
OFF ON
SHUTDOWN
AND
OFF ON
SHUTDOWN
AND
50
45
POWER LOSS
FROM V OUT2
100
50
DIMMING
CONTROL
CONTROL
3498 TA01
40
0.1
1 10
LOAD CURRENT (mA)
0
100
3498 TA01b
3498fa
1
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