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LT3498

20mA LED Driver and

OLED Driver with Integrated

Schottky in 3mm x 2mm DFN

DESCRIPTION

The LT

廬

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 鈥渙ne-wire鈥?current source鈥攐ne 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 ef鏗乧iency over a wide load

range. The off time of the switch is not allowed to exceed a

鏗亁ed 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

鈻?/div>

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

鈥淥ne-Wire Current Source鈥?/div>

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

APPLICATIONS

鈻?/div>

Cellular Phones

PDAs, Handheld Computers

Digital Cameras

MP3 Players

GPS Receivers

TYPICAL APPLICATION

Li-Ion to Six White LEDs and OLED/LCD Bias

80

V

IN

= 3V TO 5V

4.7碌F

0.47碌F

OLED Ef鏗乧iency

75

70

EFFICIENCY (%)

16V

24mA

V

IN

= 3.6V

V

OUT2

= 16V

LOAD FROM V

OUT2

400

350

300

POWER LOSS (mW)

250

200

150

100

15碌H

1碌F

10鈩?/div>

CAP1 SW1

V

IN

15碌H

SW2 CAP2 V

OUT2

65

60

55

50

45

40

0.1

POWER LOSS

FROM V

OUT2

1

10

LED CURRENT (mA)

10碌F

LT3498

LED1

20mA

CTRL1

OFF ON

SHUTDOWN

AND

DIMMING

CONTROL

3498 TA01

GND1

GND2

CTRL2

OFF ON

SHUTDOWN

AND

CONTROL

FB2

2.21M鈩?/div>

50

0

100

3498 TA01b

3498f

1

LQH2MCN100K02,LQH2MCN150K02

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