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參數(shù)資料
| 型號(hào)： | LCQF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| 中文描述： | 20mA的LED驅(qū)動(dòng)器和3毫米的OLED驅(qū)動(dòng)器集成肖特基x 2mm DFN封裝 |
| 文件頁(yè)數(shù)： | 1/24頁(yè) |
| 文件大小： | 449K |
| 代理商： | LCQF |
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LT3498
1
3498f
LED CURRENT (mA)
0.1
65
70
80
60
50
100
40
55
45
75
250
300
400
200
100
0
150
50
350
E
P
3498 TA01b
1
10
LOAD FROM V
OUT2
V
IN
= 3.6V
V
OUT2
= 16V
POWER LOSS
FROM V
OUT2
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
20mA LED Driver and
OLED Driver with Integrated
Schottky in 3mm x 2mm DFN
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
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 efficiency over a wide load
range. The off time of the switch is not allowed to exceed a
fixed level, guaranteeing a switching frequency that stays
above the audio band.
Li-Ion to Six White LEDs and OLED/LCD Bias
■
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
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Patent Pending
OLED Efficiency
SHUTDOWN
AND
DIMMING
CONTROL
SHUTDOWN
AND
CONTROL
V
IN
4.7
μ
F
0.47
μ
F
16V
24mA
20mA
15
μ
H
15
μ
H
1
μ
F
V
IN
= 3V TO 5V
V
OUT2
10
2.21M
3498 TA01
LT3498
SW1
CAP1
SW2 CAP2
FB2
CTRL1
LED1
CTRL2
GND2
GND1
10
μ
F
ON
OFF
ON
OFF
■
Cellular Phones
■
PDAs, Handheld Computers
■
Digital Cameras
■
MP3 Players
■
GPS Receivers
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