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LT3498EDDB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3498
4
3498fa
TEMPERATURE (°C)
–50 –25
300
CURRENT LIMIT (mA)
350
500
0
50
75
3498 G07
450
400
25
100
125
V
IN
(V)
0
25
OUTPUT CLAMP VOLTAGE (V)
26
27
28
29
2
468
3498 G08
10 12
T = –50°C
T = 150°C
T = 25°C
V
IN
(V)
0
0
SHUTDOWN CURRENT (μA)
3
6
9
12
15
2
468
3498 G01
10 12
T = –50°C
T = 125°C
T = 25°C
SWITCH CURRENT (mA)
0
0
SWITCH SATURATION VOLTAGE (mV)
50
150
200
250
500
350
100 200 250
100
400
450
300
50 150 300 350 400
3498 G02
T = –50°C
T = 125°C
T = 25°C
SCHOTTKY FORWARD DROP (mV)
0
SCHOTTKY FORWARD CURRENT (mA)
150
200
250
600
1000
100
50
0
200 400 800
300
350
400
3498 G03
T = –50°C
T = 125°C
T = 25°C
V
CTRL1
(mV)
0
0
SENSE VOLTAGE (mV)
40
80
120
160
200
240
500 1000 1500 2000
3498 G04
T = 25°C
T = –50°C
T = 125°C
TEMPERATURE (°C)
–50 –25
186
SENSE VOLTAGE (mV)
194
206
0
50
75
3498 G05
190
202
198
25
100
125
T = –50°C
CAP1 VOLTAGE (V)
0
SENSE VOLTAGE (mV)
198
202
206
20
194
190
186
5
10
15
25
3498 G06
T = 125°C
T = 25°C
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Current
(V
CTRL1
= V
CTRL2
= 0V)
LED Switch Saturation
Voltage (V
CESAT1
)
LED Schottky Forward
Voltage Drop
Sense Voltage (V
CAP1
– V
LED1
)
vs V
CTRL1
Sense Voltage (V
CAP1
– V
LED1
)
vs Temperature
Sense Voltage (V
CAP1
– V
LED1
)
vs V
CAP1
LED Current Limit
vs Temperature
Open Circuit Output
Clamp Voltage
Input Current in Output
Open Circuit
T
A
= 25°C, unless otherwise specifi ed.
V
IN
(V)
2
0
INPUT CURRENT (mA)
1
2
3
4
5
6
46810
12
3498 G09
T = –50°C
T = 150°C
T = 25°C
LT3498
5
3498fa
TEMPERATURE (°C)
–50
LED SWITCHING FREQUENCY (MHz)
2.5
25
3498 G10
2.2
2.0
–25 0 50
1.9
1.8
2.6
2.4
2.3
2.1
75 100 125
SWITCH CURRENT (mA)
0
0
SWITCH SATURATION VOLTAGE (mV)
50
100
150
200
300
50
100 150 200
3498 G11
250 300
250
T = –50°C
T = 125°C
T = 25°C
SCHOTTKY FORWARD DROP (mV)
0
SCHOTTKY FORWARD CURRENT (mA)
150
200
250
600
12001000
100
50
0
200 400 800
300
350
400
3498 G12
T = –50°C
T = 125°C
T = 25°C
CTRL2 VOLTAGE (mV)
0
0
V
OUT2
VOLTAGE (V)
2
6
8
10
1000
2000
18
4
500 1500
12
14
16
3498 G13
TEMPERATURE (°C)
–50 –25
–6
OUTPUT VOLTAGE CHANGE (%)
–3
6
0
50
75
3498 G14
3
0
25
100
125
LOAD CURRENT (mA)
0
V
OUT2
VOLTAGE CHANGE (%)
–0.5
0
0.5
30
50
–1.0
–1.5
–2.0
10 20 40
1.0
1.5
2.0
3498 G15
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (kHz)
70
25
3498 G16
40
20
–25 0 50
10
0
80
60
50
30
75 100 125
LOAD CURRENT (mA)
0.1
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
1 10 100
3498 G17
600
400
200
TEMPERATURE (°C)
–50
PEAK INDUCTOR CURRENT (mA)
550
25
3498 G18
400
300
–25 0 50
250
200
600
500
450
350
75 100 125
TYPICAL PERFORMANCE CHARACTERISTICS
LED Switching Frequency
vs Temperature
OLED Switch Saturation
Voltage (V
CESAT2
)
OLED Schottky Forward
Voltage Drop
V
OUT2
vs V
CTRL2
(V
OUT2
= 16V)
V
OUT2
vs Temperature
(V
OUT2
= 16V) V
OUT2
Load Regulation
OLED Minimum
Switching Frequency
OLED Switching Frequency
vs Load Current
Peak Inductor Current
T
A
= 25°C, unless otherwise specifi ed.
LT3498
6
3498fa
TYPICAL PERFORMANCE CHARACTERISTICS
LED Switching Waveforms LED Transient Response
OLED Switching Waveforms
with No Load
OLED Switching Waveforms
with 4mA Load
OLED Switching Waveforms
with 35mA Load
OLED Switching Waveforms
During Start-Up
PIN FUNCTIONS
LED1 (Pin 1): Connection Point Between the Anode of the
Highest LED and the Sense Resistor. The LED current can
be programmed by:
I
mV
R
LED
SENSE
1
1
200
=
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
LED1
= 200mV / R
SENSE1
).
GND1, 2 (Pins 3, 4): Ground. Tie directly to local ground
plane. GND1 and GND2 are connected internally.
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
FB2
according to
the following formula:
R
FB2
=182 •
V
OUT2
1.215
1
k
T
A
= 25°C, unless otherwise specifi ed.
500ns/DIV
V
SW
10V/DIV
V
CAP1
50mV/DIV
I
L
100mA/
DIV
3498 G19
V
IN
= 3.6V
FRONT PAGE APPLICATION
1ms/DIV
V
CAP1
5V/DIV
V
CTRL1
5V/DIV
I
L
200mA/
DIV
3498 G20
V
IN
= 3.6V
FRONT PAGE APPLICATION
5μs/DIV
V
OUT2
10mV/DIV
AC COUPLED
S
W2 VOLTAGE
10V/DIV
INDUCTOR
CURRENT
50mA/DIV
3498 G21
V
IN
= 3.6V
V
OUT2
= 16V
3498 G22
2μs/DIV
V
OUT2
10mV/DIV
AC
COUPLED
SW2
VOLTAGE
10V/DIV
INDUCTOR
CURRENT
200mA/DIV
V
IN
= 3.6V
V
OUT2
= 16V
3498 G23
500ns/DIV
SW2
VOLTAGE
10V/DIV
V
OUT2
10mV/DIV
AC COUPLED
INDUCTOR
CURRENT
200mA/DIV
V
IN
= 3.6V
V
OUT2
= 16V
3498 G24
500μs/DIV
V
OUT2
VOLTAGE
5V/DIV
CAP2
VOLTAGE
5V/DIV
INDUCTOR
CURRENT
100mA/DIV
V
IN
= 3.6V
V
OUT2
= 16V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3498EDDB#TRMPBF

Mfr. #:
Buy LT3498EDDB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 20mA LED Driver & OLED Driver w/ Integrated Schottky in 2x3 DFN
Lifecycle:
New from this manufacturer.
Delivery:
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