LT1937 LINER [Linear Technology], LT1937 Datasheet
LT1937
Manufacturer Part Number
LT1937
Description
20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT1937.pdf
(24 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
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
Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
1 F
Li-Ion to Six White LEDs and OLED/LCD Bias
10
20mA
CAP1
LED1
V
IN
SHUTDOWN
SW1
DIMMING
CONTROL
= 3V TO 5V
OFF
CTRL1
AND
15 H
ON
GND1
3498 TA01
LT3498
V
IN
15 H
GND2
4.7 F
SW2 CAP2
SHUTDOWN
CONTROL
OFF
CTRL2
AND
ON
V
FB2
OUT2
0.47 F
2.21M
10 F
16V
24mA
Schottky in 3mm x 2mm DFN
OLED Driver with Integrated
DESCRIPTION
The LT
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
power delivery by varying both the peak inductor current
and switch off time. This technique results in low output
voltage ripple, as well as, high effi ciency over a wide load
range. The off time of the switch is not allowed to exceed a
fi xed level, guaranteeing a switching frequency that stays
above the audio band.
All other trademarks are the property of their respective owners.
*Patent Pending
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
3498 is a dual output boost converter featuring a
80
75
70
65
55
50
45
40
60
20mA LED Driver and
0.1
V
V
IN
OUT2
= 3.6V
= 16V
OLED Effi ciency
POWER LOSS
FROM V
LED CURRENT (mA)
1
LOAD FROM V
OUT2
10
OUT2
3498 TA01b
100
LT3498
400
350
300
250
200
150
100
50
0
1
3498f
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