LT3498EDDB#TRPBF Linear Technology, LT3498EDDB#TRPBF Datasheet - Page 6

• Manufacturer Part Number: LT3498EDDB#TRPBF
• Description: IC LED DRVR WT/OLED BCKLGT 12DFN
• Manufacturer: Linear Technology
• Type: Backlight, OLED, White LEDr

Specifications of LT3498EDDB#TRPBF

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: OLED, White LED
• Frequency: 1.8MHz ~ 2.8MHz
• Voltage - Supply: 2.5 V ~ 12 V
• Voltage - Output: 32V
• Mounting Type: Surface Mount
• Package / Case: 12-DFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 20mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

LT3498
TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
200mA/DIV
6
LED1 (Pin 1): Connection Point Between the Anode of the
Highest LED and the Sense Resistor. The LED current can
be programmed by:
CTRL1 (Pin 2): Dimming and Shutdown Pin. Connect this
pin below 75mV to disable the white LED driver. As the
pin voltage is ramped from 0V to 1.5V, the LED current
ramps from 0 to (I
GND1, 2 (Pins 3, 4): Ground. Tie directly to local ground
plane. GND1 and GND2 are connected internally.
INDUCTOR
50mV/DIV
10mV/DIV
CURRENT
COUPLED
VOLTAGE
10V/DIV
10V/DIV
100mA/
I
V
V
LED
SW2
CAP1
OUT2
V
DIV
AC
SW
I
L
1
V
FRONT PAGE APPLICATION
OLED Switching Waveforms
with 4mA Load
V
V
LED Switching Waveforms
IN
=
IN
OUT2
= 3.6V
= 3.6V
R
200
= 16V
SENSE
mV
1
LED1
500ns/DIV
2μs/DIV
= 200mV / R
3498 G19
3498 G22
SENSE1
AC COUPLED
200mA/DIV
INDUCTOR
10mV/DIV
CURRENT
VOLTAGE
10V/DIV
200mA/
V
5V/DIV
5V/DIV
V
V
CTRL1
CAP1
OUT2
SW2
).
DIV
I
L
LED Transient Response
V
FRONT PAGE APPLICATION
OLED Switching Waveforms
with 35mA Load
V
V
IN
IN
OUT2
= 3.6V
= 3.6V
= 16V
500ns/DIV
1ms/DIV
CTRL2 (Pin 5): Dimming and Shutdown Pin. Connect
it below 75mV to disable the low noise boost converter.
As the pin voltage is ramped from 0V to 1.5V, the output
ramps up to the programmed output voltage.
FB2 (Pin 6): Feedback Pin. Reference voltage is 1.215V.
There is an internal 182kΩ resistor from FB2 to GND. To
achieve desired output voltage, choose R
the following formula:
R
FB2
=182 •
T
3498 G20
3498 G23
A
= 25°C, unless otherwise specifi ed.
SW2 VOLTAGE
V
1.215
AC COUPLED
OUT2
100mA/DIV
INDUCTOR
INDUCTOR
CURRENT
10mV/DIV
50mA/DIV
CURRENT
VOLTAGE
VOLTAGE
10V/DIV
5V/DIV
5V/DIV
CAP2
V
V
OUT2
OUT2
1 k
OLED Switching Waveforms
with No Load
OLED Switching Waveforms
During Start-Up
V
V
V
V
IN
OUT2
IN
OUT2
= 3.6V
= 3.6V
= 16V
= 16V
500μs/DIV
5μs/DIV
FB2
according to
3498fa
3498 G24
3498 G21