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LT3466EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
4
LT3466
3466fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Saturation Voltage (V
CESAT
) Switch Current Limit vs Duty Cycle
Shutdown Quiescent Current
(CTRL1 = CTRL2 = 0V)
Open-Circuit Clamp Voltage
vs V
IN
SWITCH CURRENT (mA)
0
SWITCH SATURATION VOLTAGE (mV)
250
300
350
400
3466 G04
200
150
0
100
200
300
50
150
250
350
100
50
450
400
T
A
= 25°C
V
CE1
, V
CE2
DUTY CYCLE (%)
0
CURRENT LIMIT (mA)
300
400
80
3466 G05
200
100
250
350
450
500
150
50
0
20
40
60
100
T
A
= –50°C
T
A
= 85°C
T
A
= 25°C
V
IN
(V)
4
SHUTDOWN CURRENT (µA)
60
80
100
20
3466 G06
40
20
50
70
90
30
10
0
8
12
16
6222
10
14
18
24
T
A
= –50°C
T
A
= 100°C
T
A
= 25°C
V
IN
(V)
2
OUTPUT CLAMP VOLTAGE (V)
39.5
40.0
18
3466 G07
39.0
38.5
6
10
12
24
40.5
14
4
8
20 22
16
V
OUT2
V
OUT1
T
A
= 25°C
R
T
= 63.4k
TEMPERATURE (°C)
–50
OUTPUT CLAMP VOLTAGE (V)
39
40
3466 G08
38
37
0
50
100
42
41
V
IN
= 3.6V
R
T
= 63.4k
V
OUT2
V
OUT1
V
IN
(V)
2
INPUT CURRENT (mA)
15
20
25
18
3466 G09
10
5
0
468
10 12
14 16 20 22
24
T
A
= 25°C
R
T
= 63.4k
Open-Circuit Clamp Voltage
vs Temperature
Input Current with Output 1 and
Output 2 Open Circuit
V
FB
vs V
CTRL
CONTROL VOLTAGE (V)
0
FEEDBACK VOLTAGE (mV)
100
150
2
3466 G03
50
0
0.5
1
1.5
250
200
V
IN
= 3V
T
A
= 25°C
Distribution of V
FB
vs V
CTRL
V
FB
vs V
CTRL
(Temperature Variation)
CONTROL VOLTAGE (V)
0
FEEDBACK VOLTAGE (mV)
100
150
MAX
±4mV
TYP
MIN
2
3466 G16
50
0
0.5
1
1.5
250
V
IN
= 3V
T
A
= 25°C
200
±4mV
CONTROL VOLTAGE (V)
0
FEEDBACK VOLTAGE (mV)
100
150
2
3466 G17
50
0
0.5
1
1.5
250
200
±5mV
T
A
= –45°C
T
A
= 25°C
T
A
= 85°C
5
LT3466
3466fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Schottky Forward Voltage Drop Schottky Leakage Current
Quiescent Current
(CTRL1 = CTRL2 = 3V)
V
IN
(V)
0
0
QUIESCENT CURRENT (mA)
1
2
3
4
6
4
81216
3466 G13
20 24
5
T
A
= 25°C
SCHOTTKY FORWARD DROP (mV)
0
SCHOTTKY FORWARD CURRENT (mA)
150
200
250
600
1000
3466 G14
100
50
0
200 400 800
300
350
400
T
A
= 25°C
TEMPERATURE (°C)
–50
0
SCHOTTKY LEAKAGE CURRENT (µA)
1
2
3
4
6
050
3466 G15
100
V
R
= 36V
5
V
R
= 20V
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
OSCILLATOR FREQUENCY (kHz)
1250
1500
1750
3466 G12
1000
750
500
050
2000
2250
2500
100
V
IN
= 3.6V
R
T
= 20.5k
R
T
= 48.7k
R
T
vs Oscillator Frequency
OSCILLATOR FREQUENCY (kHz)
R
T
(kΩ)
1000
3466 G10
10
100
600 180014001000
200
Oscillator Frequency vs V
IN
V
IN
(V)
2
OSCILLATOR FREQUENCY (kHz)
1000
1100
18
3466 G11
900
800
6
10
12
24
1200
14
4
8
20 22
16
R
T
= 48.7k
6
LT3466
3466fa
UU
U
PI FU CTIO S
V
OUT1
(Pin 1/Pin 3): Output of Converter 1. This pin is
connected to the cathode of the internal Schottky diode.
Connect an output capacitor from this pin to ground.
SW1 (Pin 2/Pin 4): Switch Pin for Converter 1. Connect the
inductor at this pin.
V
IN
(Pin 3/Pin 5): Input Supply Pin. Must be locally
bypassed with a 1µF, X5R or X7R type ceramic capacitor.
SW2 (Pin 4/Pin 6): Switch Pin for Converter 2. Connect the
inductor at this pin.
V
OUT2
(Pin 5/Pin 7): Output of Converter 2. This pin is
connected to the cathode of the internal Schottky diode.
Connect an output capacitor from this pin to ground.
FB2 (Pin 6/Pin 10): Feedback Pin for Converter 2. The
nominal voltage at this pin is 200mV. Connect cathode of
the lowest LED and the feedback resisitor at this pin. The
LED current can be programmed by :
I
LED2
≈ (200mV/R
FB2
), when V
CTRL2
> 1.6V
I
LED2
≈ (V
CTRL2
/5 • R
FB2
), when V
CTRL2
< 1V
CTRL2 (Pin 7/Pin 11): Dimming and Shutdown Pin for
Converter 2. Connect this pin to ground to disable the
converter. As the pin voltage is ramped from 0V to 1.6V,
the LED current ramps from 0 to I
LED2
(= 200mV/R
FB2
).
Any voltage above 1.6V does not affect the LED current.
R
T
(Pin 8/Pin 12): Timing Resistor to Program the Switch-
ing Frequency. The switching frequency can be pro-
grammed from 200KHz to 2MHz.
CTRL1 (Pin 9/Pin 14): Dimming and Shutdown Pin for
Converter 1. Connect this pin to ground to disable the
converter. As the pin voltage is ramped from 0V to 1.6V,
the LED current ramps from 0 to I
LED1
(= 200mV/R
FB1
).
Any voltage above 1.6V does not affect the LED current.
FB1 (Pin 10/Pin 15): Feedback Pin for Converter 1. The
nominal voltage at this pin is 200mV. Connect cathode of
the lowest LED and the feedback resistor at this pin. The
LED current can be programmed by :
I
LED1
≈ (200mV/R
FB1
), when V
CTRL1
> 1.6V
I
LED1
≈ (V
CTRL1
/5 • R
FB1
), when V
CTRL1
< 1V
Exposed Pad (Pin 11/Pin 17): The Exposed Pad must be
soldered to the PCB system ground.
GND (NA/Pins 1, 8, 9, 16): These pins are internally fused
to the Exposed Pad (TSSOP package only). Connect these
GND pins and the Exposed Pad to the PCB system ground.
(DD/TSSOP)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3466EDD#PBF

Mfr. #:
Buy LT3466EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers Dual White LED Step-up Converter w/ Schottky
Lifecycle:
New from this manufacturer.
Delivery:
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