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LT3975HMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3975
4
3975f
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency at 3.3V
OUT
No-Load Supply Current No-Load Supply Current
Reference Voltage Load Regulation Line Regulation
Efficiency at 5V
OUT
Efficiency at 3.3V
OUT
Efficiency at 5V
OUT
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
2
3975 G01
70
60
75
85
95
65
55
50
0.5
1
1.5
2.5
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
L = MSS1260-332NL
LOAD CURRENT (A)
0
EFFICIENCY (%)
70
80
90
2
3975 G02
60
50
65
75
85
55
45
40
0.5
1
1.5
2.5
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
L = MSS1260-332NL
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3975 G03
1000
80
100
10
30
50
70
90
10000
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
L = MSS1260-332NL
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3975 G03
1000
80
10
30
50
70
90
10000
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
L = MSS1260-332NL
INPUT VOLTAGE (V)
0
1.0
INPUT CURRENT (µA)
1.5
2.5
3.0
3.5
4.5
5
25
35
3975 G05
2.0
4.0
20
45
10
15
30
IN REGULATION
V
OUT
= 3.3V
40
TEMPERATURE (°C)
10
INPUT CURRENT (µA)
1000
10000
–55 65 125
3975 G06
1
5–25 95 15535
100
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 3.3V
DUE TO CATCH
DIODE LEAKAGE
TEMPERATURE (°C)
–55
REFERENCE VOLTAGE (V)
1.190
1.220
1.225
1.230
5
65
95
3975 G07
1.180
1.175
1.210
1.200
1.185
1.215
1.170
1.205
1.195
–25
35
125
155
INPUT VOLTAGE (V)
0
CHANGE IN V
OUT
(%)
–0.05
0
0.05
1.5
2.5
3975 G08
–0.10
–0.15
–0.20
0.5 1 2
0.10
0.15
0.20
V
IN
= 12V
V
OUT
= 5V
INPUT VOLTAGE (V)
5
–0.05
CHANGE IN V
OUT
(%)
–0.04
–0.02
–0.01
0
0.05
0.02
15
25
30 45
2975 G09
–0.03
0.03
0.04
0.01
10 20
35
40
V
OUT
= 5V
LOAD = 1A
LT3975
5
3975f
TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit Foldback Soft-Start Switch V
CESAT
BOOST Pin Current
Minimum On-Time Minimum Off-Time
Thermal Derating Switch Current Limit Switch Current Limit
T
A
= 25°C, unless otherwise noted.
SWITCH CURRENT (A)
0
0
V
CESAT
(mV)
50
100
150
200
250
0.5
1 1.5 2.0
3975 G15
2.5 3.0
SWITCH CURRENT (A)
0
0
BOOST PIN CURRENT (mA)
10
20
30
0.5
1
1.5 2
3975 G16
2.5
40
50
5
15
25
35
45
3
TEMPERATURE (°C)
–50
0
LOAD CURRENT (A)
0.5
1.0
1.5
2.0
0 50
100
150
3975 G10
2.5
3.0
–25 25
75
125
I-GRADE
H-GRADE
V
IN
= 12V
V
OUT
= 5V
LIMITED BY MAXIMUM
JUNCTION TEMPERATURE
θ
JA
= 40°C/W
DUTY CYCLE
0
5
6
7
0.8
3975 G11
4
3
0.2 0.4 0.6 1
2
1
0
CURRENT LIMIT (A)
TEMPERATURE (°C)
–55
CURRENT LIMIT (A)
6.5
35
3975 G12
5.0
4.0
–25 5 65
3.5
3.0
7.0
6.0
5.5
4.5
95 125 155
30% DUTY CYCLE
FB PIN VOLTAGE (V)
0
0
CURRENT LIMIT (A)
1
2
3
4
6
0.2
0.4 0.6 0.8
3975 G13
1.0 1.2
5
30% DUTY CYCLE
V
SS
= 3V
SS PIN VOLTAGE (V)
0
0
CURRENT LIMIT (A)
1
2
3
4
5
6
0.5 1 1.5 2
3975 G14
2.5
V
FB
= 1V
V
FB
= 0V
30% DUTY CYCLE
TEMPERATURE (°C)
–55
MINIMUM ON-TIME (ns)
100
160
170
180
5
65
95
3975 G17
80
140
120
90
150
60
70
130
110
–25
35
125
155
V
SYNC
= 0V
f
SW
= 2MHz
LOAD = 1A
LOAD = 2.5A
TEMPERATURE (°C)
–55
100
MINIMUM OFF-TIME (ns)
110
130
140
150
200
170
5
65
95 125
3975 G18
120
180
190
160
–25
35
155
V
SYNC
= 0V
f
SW
= 2MHz
LOAD = 1A
LOAD = 2.5A
LT3975
6
3975f
TYPICAL PERFORMANCE CHARACTERISTICS
Internal Undervoltage Lockout
(UVLO) EN Thresholds PG Thresholds
Minimum Input Voltage,
V
OUT
= 5V
Minimum Input Voltage,
V
OUT
= 3.3V
Burst Frequency
Switching Frequency
R
T
Programmed Switching
Frequency Frequency Foldback
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–55
SWITCHING FREQUENCY (kHz)
660
720
780
35 95
3975 G19
600
540
–25 5
65 125 155
480
420
SWITCHING FREQUENCY (MHz)
0.2
0
R
T
RESISTOR (kΩ)
50
150
200
250
350
0.4
1.2
1.6
3975 G20
100
300
1
2
2.2
0.6
0.8
1.4 1.8
FB PIN VOLTAGE (V)
0
700
600
500
400
300
200
100
0
0.6 1
3975 G21
0.2 0.4
0.8 1.2
SWITCHING FREQUENCY (kHz)
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
4
5
6
35 95
3975 G22
3
2
–25 5
65 125 155
1
0
TEMPERATURE (°C)
–55
EN THRESHOLD (V)
1.08
35
3975 G23
1.05
1.03
–25 5 65
1.02
1.01
1.09
1.07
1.06
1.04
95 125 155
EN RISING
EN FALLING
TEMPERATURE (°C)
–55
PG THRESHOLD (V)
1.11
35
3975 G24
1.08
1.06
–25 5 65
1.05
1.04
1.12
1.10
1.09
1.07
95 125 155
FB RISING
FB FALLING
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
5.5
6.0
6.5
2
3975 G25
5.0
4.5
4.0
0.5
1
1.5
2.5
V
OUT
= 5V
f
SW
= 800kHz
TO RUN/TO START
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
4.0
4.5
5.0
2
3975 G26
3.5
3.0
2.5
0.5
1
1.5
2.5
V
OUT
= 3.3V
FRONT PAGE APPLICATION
TO RUN/TO START
LOAD CURRENT (mA)
0
SWITCHING FREQUENCY (kHz)
500
600
700
160
3975 G27
400
300
0
40
80
120
20
60
100
140
200
100
900
800
V
OUT
= 5V
f
SW
= 800kHz
V
OUT
= 3.3V
f
SW
= 600kHz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3975HMSE#PBF

Mfr. #:
Buy LT3975HMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 42V, 2.5A, 2MHz Step-Down Switching Regulator with 3.4uA Quiescent Current
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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