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LT3972EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3972
4
3972fa
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (μA)
15
3972 G04
50
30
510 20
10
130
110
90
70
25 30 35
V
OUT
= 3.3V
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT (A)
40
3972 G08
4.5
20 60
3.5
3.0
6.0
5.5
5.0
4.0
80 100
TEMPERATURE (°C)
–50
SUPPLY CURRENT (μA)
350
25
3972 G05
200
100
–25 0 50
50
0
400
300
250
150
75 100 150125
V
IN
= 12V
V
OUT
= 3.3V
CATCH DIODE: DIODES, INC. PDS360
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
OUTPUT CURRENT (A)
0
0.5
50
EFFICIENCY (%)
70
100
1
2
2.5
3972 G01
60
90
80
1.5
3
3.5
V
IN
= 12V
V
IN
= 30V
V
OUT
= 5V
L = 4.7μH
f = 600kHz
V
IN
= 24V
OUTPUT CURRENT (A)
0 0.5
50
EFFICIENCY (%)
70
100
1
2
2.5
3972 G02
60
90
80
1.5
3
3.5
V
IN
= 12V
V
IN
= 30V
V
OUT
= 3.3V
L = 3.3μH
f = 600kHz
V
IN
= 24V
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3972 G07
4.5
10 20
3.5
3.0
5.5
5.0
4.0
25 30
TYPICAL
MINIMUM
V
OUT
= 5V
T
A
= 25°C
L = 4.7μH
f = 600kHz
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3972 G06
4.0
10 20
3.0
2.5
5.5
5.0
4.5
3.5
25 30
TYPICAL
MINIMUM
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 600kHz
TEMPERATURE (°C)
SWITCH CURRENT LIMIT (A)
4.0
4.5
5.5
5.0
3972 G09
3.5
3.0
2.0
2.5
6.5
6.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
–50 25–25 0 50 75 100 150125
Effi ciency
Effi ciency
No-Load Supply Current Maximum Load Current
Switch Current Limit
Switch Current Limit
Maximum Load Current
No-Load Supply Current
Effi ciency
T
A
= 25°C unless otherwise noted.
OUTPUT CURRENT (A)
0 0.5
50
EFFICIENCY (%)
TOTAL POWER LOSS (W)
70
100
1
2
2.5
3972 G03
60
90
80
0.5
1.5
3.0
1.0
2.5
2.0
1.5
3
3.5
V
IN
= 12V
V
OUT
= 5V
L = 4.7μH
f = 600kHz
TYPICAL PERFORMANCE CHARACTERISTICS
LT3972
5
3972fa
BOOST DIODE CURRENT (A)
0
BOOST DIODE V
F
(V)
0.8
1.0
1.2
2.0
3972 G18
0.6
0.4
0
0.5 1.0 1.5
0.2
1.4
RUN/SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
1.5
3972 G16
4
2
0.5 1 2
1
0
7
6
5
3
2.5 3 3.5
FB PIN VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
600
3972 G14
600
400
200 400
800
500
100 300
700 900
200
0
TEMPERATURE (°C)
MINIMUM SWITCH ON-TIME (ns)
80
100
120
3972 G15
60
40
20
0
140
–50 25–25 0 50 75 100 150125
RUN/SS PIN VOLTAGE (V)
0
RUN/SS PIN CURRENT (μA)
8
10
12
15 25
3972 G17
6
4
510
20 30 35
2
0
SWITCH CURRENT (A)
0
BOOST PIN CURRENT (mA)
15
45
60
75
120
3972 G11
30
90
105
0312 45
TEMPERATURE (°C)
FEEDBACK VOLTAGE (mV)
800
3972 G12
760
840
780
820
–50 25–25 0 50 75 100 150125
TEMPERATURE (°C)
FREQUENCY (MHz)
1.00
1.10
3972 G13
0.90
0.80
1.20
0.95
1.05
0.85
1.15
–50 25–25 0 50 75 100 150125
SWITCH CURRENT (A)
0
400
500
700
3
3972 G10
300
200
12 45
100
0
600
VOLTAGE DROP (mV)
BOOST Pin Current Feedback Voltage
Switching Frequency
Frequency Foldback
Minimum Switch On-Time
Soft-Start
RUN/SS Pin Current Boost Diode
Switch Voltage Drop
T
A
= 25°C unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
LT3972
6
3972fa
FB PIN ERROR VOLTAGE (mV)
–200
–50
V
C
PIN CURRENT (μA)
–20
0
20
0 200
50
3972 G19
–40
–100 100
40
10
–10
30
–30
Error Amp Output Current
TEMPERATURE (°C)
V
C
VOLTAGE (V)
1.50
2.00
2.50
3972 G22
1.00
0.50
0
CURRENT LIMIT CLAMP
SWITCHING THRESHOLD
–50 25–25 0 50 75 100 150125
LOAD CURRENT (mA)
1
INPUT VOLTAGE (V)
3.0
3.5
10000
3972 G20
2.5
2.0
10 100 1000
5.0
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
1 1000010 100 1000
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
5.0
5.5
3972 G21
4.5
4.0
6.5
6.0
V
OUT
= 5V
T
A
= 25°C
L = 4.7μH
f = 800kHz
3972 G24
I
L
0.2A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
5μs/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
LOAD
= 10mA
TEMPERATURE (°C)
THRESHOLD VOLTAGE (%)
85
90
95
3972 G23
80
75
–50 25–25 0 50 75 100 150125
3972 G25
I
L
0.2A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
LOAD
= 110mA
1μs/DIV
3972 G26
I
L
0.5A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
LOAD
= 1A
1μs/DIV
Minimum Input Voltage Minimum Input Voltage
V
C
Voltages Power Good Threshold
Switching Waveforms; Transition
from Burst Mode Operation to Full
Frequency
Switching Waveforms; Full
Frequency Continuous Operation
Switching Waveforms;
Burst Mode Operation
T
A
= 25°C unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
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LT3972EDD#PBF

Mfr. #:
Buy LT3972EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75uA Quiescent Current
Lifecycle:
New from this manufacturer.
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