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LT3497EDDB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3497
4
3497f
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
(V
CESAT
)
Schottky Forward Voltage Drop
Shutdown Current
(V
CTRL1
= V
CTRL2
= 0V)
Sense Voltage (V
CAP
– V
LED
)
vs V
CTRL
Open-Circuit Output Clamp
Voltage
Input Current in Output Open
Circuit
Switching Waveform Transient Response
(T
A
= 25°C unless otherwise specifi ed)
SWITCH CURRENT (mA)
0
SWITCH SATURATION VOLTAGE (mV)
200
250
300
350
400
3497 G01
150
100
0
100
200
300
50
150
250
350
50
450
400
–50°C
125°C
25°C
SCOTTKY FORWARD DROP (mV)
0
SCHOTTKY FORWARD CURRENT (mA)
150
200
250
600
1000
3497 G02
100
50
0
200 400 800
300
350
400
–50°C
125°C
25°C
V
IN
(V)
0
SHUTDOWN CURRENT (µA)
9
12
15
8
3497 G03
6
3
0
2
4
6
10
–50°C
125°C
25°C
V
CTRL
(mV)
0
0
SENSE VOLTAGE (mV)
40
80
120
160
200
240
500 1000 1500 2000
3497 G04
–50°C
125°C
25°C
V
IN
(V)
0
OUTPUT CLAMP VOLTAGE (V)
32
33
8
3497 G05
31
30
2
4
6
10
34
–50°C
125°C
25°C
V
IN
(V)
2
0
INPUT CURRENT (mA)
5
10
15
20
25
30
46 810
3497 G06
–50°C
150°C
25°C
V
SW
10V/DIV
V
CAP
50mV/DIV
I
L
100mA/DIV
200ms/DIV
3497 G07
V
IN
= 3.6V
FRONT PAGE
APPLICATION CIRCUIT
V
CAP
5V/DIV
V
CTRL
5V/DIV
I
L
200mA/DIV
1ms/DIV
3497 G08
V
IN
= 3.6V
FRONT PAGE
APPLICATION CIRCUIT
LT3497
5
3497f
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current Current Limit vs Temperature
Schottky Leakage Current vs
Temperature (–50°C to 125°C)
Open-Circuit Output Clamp Voltage
vs Temperature (–50°C to 125°C)
Input Current in Output Open
Circuit vs Temperature
(–50°C to 125°C)
(T
A
= 25°C unless otherwise specifi ed)
Switching Frequency vs
Temperature
Sense Voltage (V
CAP
– V
LED
)
vs V
CAP
Sense Voltage vs Temperature
V
IN
(V)
0
5
6
7
8
3497 G09
4
3
246 10
2
1
0
QUIESCENT CURRENT (mA)
–50°C
125°C
25°C
TEMPERATURE (°C)
–50
300
CURRENT LIMIT (mA)
350
400
450
500
–25 0 25 50
3497 G11
75 100 125
TEMPERATURE (°C)
0
SCHOTTKY LEAKAGE CURRENT (µA)
1
2
3
–50 –25 0 25 50
3497 G12
75 100 125
24V
16V
TEMPERATURE (°C)
–50
28
OUTPUT CLAMP VOLTAGE (V)
30
32
34
36
–25 0 25 50
3497 G13
75 100 125
TEMPERATURE (°C)
–50
INPUT CURRENT (mA)
20
25
30
25 75
3497 G14
15
10
–25 0
50 100 125
5
0
V
IN
= 3V
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (MHz)
2.50
25
3497 G15
2.20
2.00
–25 0 50
1.90
1.80
2.60
2.40
2.30
2.10
75 100 125
V
IN
= 3.6V
V
CAP
(V)
5
SENSE VOLTAGE (mV)
200
204
208
25
3497 G16
196
192
188
10
15
20
30
–50°C
125°C
25°C
TEMPERATURE (°C)
–50
190
SENSE VOLTAGE (mV)
194
198
202
206
–25 0 25 50
3497 G17
75 100 125
LT3497
6
3497f
PIN FUNCTIONS
LED1 (Pin 1): Connection point for the anode of the fi rst
LED of the fi rst set of LEDs and the sense resistor (R
SENSE1
).
The LED current can be programmed by:
I
mV
R
LED
SENSE
1
1
200
=
CTRL1 (Pin 2): Dimming and Shutdown Pin. Connect
CTRL1 below 50mV to disable converter 1. As the pin volt-
age is ramped from 0V to 1.5V, the LED current ramps from
0 to (I
LED1
= 200mV/R
SENSE1
). The CTRL1 pin must not
be left fl oating.
GND (Pin 3): Connect the GND pin to the PCB system
ground plane.
CTRL2 (Pin 4): Dimming and Shutdown Pin. Connect
CTRL2 below 50mV to disable converter 2. As the pin volt-
age is ramped from 0V to 1.5V, the LED current ramps from
0 to (I
LED2
= 200mV/R
SENSE2
). The CTRL2 pin must not
be left fl oating.
LED2 (Pin 5): Connection point for the anode of the fi rst
LED of the second set of LEDs and the sense resistor
(R
SENSE2
). The LED current can be programmed by:
I
mV
R
LED
SENSE
2
2
200
=
CAP2 (Pin 6): Output of Converter 2. This pin is connected
to the cathode of internal Schottky diode 2. Connect the
output capacitor to this pin and the sense resistor (R
SENSE2
)
from this pin to LED2 pin.
SW2 (Pin 7): Switch Pin. Minimize trace area at this pin
to minimize EMI. Connect the inductor at this pin.
V
IN
(Pin 8): Input Supply Pin. This pin must be locally
bypassed.
SW1 (Pin 9): Switch Pin. Minimize trace area at this pin
to minimize EMI. Connect the inductor at this pin.
CAP1 (Pin 10): Output of Converter 1. This pin is connected
to the cathode of internal Schottky diode 1. Connect the
output capacitor to this pin and the sense resistor (R
SENSE1
)
from this pin to LED1 pin.
Exposed Pad (Pin 11): Ground. Must be soldered to
PCB.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3497EDDB#TRMPBF

Mfr. #:
Buy LT3497EDDB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers Dual Full Function white LED Step-Up Converter w/ Built in Schottky Diodes
Lifecycle:
New from this manufacturer.
Delivery:
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