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LT3481HDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3481
4
3481fc
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT(A)
40
3481 G08
2.5
20 60
1.5
1.0
4.0
3.5
3.0
2.0
80 100
TEMPERATURE (°C)
–50
SUPPLY CURRENT (μA)
350
25
3481 G05
200
100
–25 0 50
50
0
400
300
250
150
75 100 125 150
V
IN
= 12V
V
OUT
= 3.3V
CATCH DIODE: DIODES, INC. PDS360
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
Effi ciency (V
OUT
= 5.0V)
Effi ciency (V
OUT
= 3.3V)
No Load Supply Current No Load Supply Current
Maximum Load Current
LOAD CURRENT (A)
0.0001
0
EFFICIENCY (%)
40
30
100
0.001 0.01 0.1 1 10
3481 G01
20
10
60
50
90
80
70
V
IN
= 24V
V
IN
= 12V
L: NEC PLC-0745-4R7
f: 800kHz
LOAD CURRENT (A)
0.0001
0
EFFICIENCY (%)
40
30
100
0.001 0.01 0.1 1 10
3481 G02
20
10
60
50
90
80
70
V
IN
= 12V
V
IN
= 24V
V
IN
= 7V
L: NEC PLC-0745-4R7
f: 800kHz
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (μA)
70
15
3481 G04
40
20
510 20
10
0
80
60
50
30
25 30 35
T
A
= 25°C
FRONT PAGE APPLICATION
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3481 G07
2.5
10 20
1.5
1.0
4.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 5.0V
T
A
= 25°C
L = 4.7μH
f = 800kHz
Switch Current Limit
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3481 G06
2.5
10 20
1.5
1.0
4.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
TEMPERATURE (°C)
–50
SWITCH CURRENT LIMIT (A)
2.0
2.5
3.0
125
3481 G09
1.5
1.0
0
0–25 5025 10075
0.5
4.5
4.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
Maximum Load Current
Switch Current Limit
SWITCHING FREQUENCY (MHz)
0
EFFICIENCY (%)
85
1.5
3481 G03
70
60
0.5 1 2
55
50
90
80
75
65
2.5 3
V
IN
= 12V
V
IN
= 24V
V
OUT
= 3.3V
L = 10μH
LOAD = 1A
Effi ciency
TYPICAL PERFORMANCE CHARACTERISTICS
LT3481
5
3481fc
BOOST DIODE CURRENT (A)
0
BOOST DIODE V
f
(V)
0.8
1.0
1.2
2.0
3481 G18
0.6
0.4
0
0.5
1.0
1.5
0.2
1.6
1.4
RUN/SS PIN VOLTAGE (V)
0
RUN/SS PIN CURRENT (μA)
8
10
12
15 25
3481 G17
6
4
510
20 30 35
2
0
Switch Voltage Drop
BOOST Pin Current
Feedback Voltage
Switching Frequency
Frequency Foldback Minimum Switch On-Time
Soft-Start
RUN/SS Pin Current Boost Diode
SWITCH CURRENT (mA)
0
400
500
700
1500 2500
3481 G10
300
200
500 1000
2000 3000 3500
100
0
600
VOLTAGE DROP (mV)
SWITCH CURRENT (mA)
0
0
BOOST PIN CURRENT (mA)
10
30
40
50
2000
90
3481 G11
20
1000
500
2500 3000
1500 3500
60
70
80
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.270
1.280
125 150
4381 G12
1.260
1.250
0 50 100–25 25 75
1.290
1.265
1.275
1.255
1.285
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.00
1.10
125 150
4381 G13
0.90
0.80
0 50 100–25 25 75
1.20
R
T
= 45.3k
0.95
1.05
0.85
1.15
FB PIN VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
600 1000
3481 G14
600
400
200 400
800 1200 1400
200
0
R
T
= 45.3k
TEMPERATURE (˚C)
–50
MINIMUM SWITCH ON TIME (ns)
80
100
120
25
3481 G15
60
40
–25 0 50 75 100 150125
20
0
140
RUN/SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
3.5
1.5
3481 G16
2.0
1.0
0.5 1 2
0.5
0
4.0
3.0
2.5
1.5
2.5 3 3.5
TYPICAL PERFORMANCE CHARACTERISTICS
LT3481
6
3481fc
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE (V)
1.50
2.00
2.50
25 75 125 150
3481 G22
1.00
0.50
0
–25 0 50 100
CURRENT LIMIT CLAMP
SWITCHING THRESHOLD
V
C
Voltages
3481 G24
I
L
0.5A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
5μs/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 10mA
FB PIN VOLTAGE (V)
1.065
–80
V
C
PIN CURRENT (μA)
–60
–20
0
20
1?.265 1.465
100
3481 G19
–40
1.165 1.365
40
60
80
LOAD CURRENT (A)
0.001
INPUT VOLTAGE (V)
3.0
3.5
10
3481 G20
2.5
2.0
0.01
0.1
1
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
LOAD CURRENT (A)
0.001
INPUT VOLTAGE (V)
5.0
5.5
10
3481 G21
4.5
4.0
0.01
0.1
1
6.5
6.0
V
OUT
= 5.0V
T
A
= 25°C
L = 4.7μH
f = 800kHz
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE (V)
1.160
1.180
1.200
25 75 150
3481 G23
1.140
1.120
1.100
–25 0 50 100 125
PG RISING
3481 G25
I
L
0.5A/DIV
V
RUN/SS
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 140mA
1μs/DIV
3481 G26
I
L
0.5A/DIV
V
RUN/SS
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 1A
1μs/DIV
Error Amp Output Current
Minimum Input Voltage
Minimum Input Voltage
Power Good Threshold
Switching Waveforms; Transition
from Burst Mode Operation to
Full Frequency
Switching Waveforms; Full
Frequency Continuous Operation
Switching Waveforms;
Burst Mode Operation
TYPICAL PERFORMANCE CHARACTERISTICS
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LT3481HDD#PBF

Mfr. #:
Buy LT3481HDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V, 2A (Iout), 2.8MHz Step-Down Switching Regulator in 3mm x 3mm DFN
Lifecycle:
New from this manufacturer.
Delivery:
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