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LT1082IQ#TRPBF

P1-P3P4-P6P7-P9P10-P12
4
LT1082
sn1082 1082fas
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Suggested Core Size and
Inductance for Telecom
5V Supply
Telecom 5V Supply Short-Circuit
Frequency Shift-Down
Minimum Input Voltage
TEMPERATURE (°C)
–75
MINIMUM INPUT VOLTAGE (V)
2.9
2.8
2.7
2.6
2.5
2.4
2.3
–50
50
100
1082 G07
25
150
–25
0
75 125
I
SW
= 1A
I
SW
= 0A
Switch Saturation Voltage
SWITCH CURRENT (A)
0
SWITCH SATURATION VOLTAGE (V)
2.00
1082 G08
0.25
0.50
1.50
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
0.75
1.00 1.25 1.75
T
J
= 150°C
T
J
= 100°C
T
J
= 25°C
T
J
= –50°C
JUNCTION TEMPERATURE (°C)
–75
TIME (µs)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
–50
50
100
1082 G06
25
150
–25
0
75 125
Flyback Blanking Time
Switch Current Limit
TEMPERATURE (°C)
–75
DUTY CYCLE (%)
97
96
95
94
93
92
91
90
–50
50
100
1082 G05
25
150
175
–25
0
75 125
Maximum Duty Cycle
DUTY CYCLE (%)
0
SWITCH CURRENT (A)
3
4
40
1082 G04
2
1
0
10
20
30
50 60 70 80 90 100
T
J
= –55°C
T
J
= 150°C
T
J
= 25°C
Short-Circuit Frequency
Shift-Down vs Feedback Current
FEEDBACK CURRENT (µA)
0 300
1082 G03
100 200 800
70
60
50
40
30
20
10
0
400 500 600 700
FREQUENCY (kHz)
T
A
= 150°C
T
A
= 0°C
T
A
= –55°C
LOAD
CURRENT
100mA
200mA
400mA
600mA
800mA
TYPE 52
POWDERED
IRON
T38 250µH
T50 250µH
T60 250µH
T60 250µH
T80 350µH
KOOL Mµ
OR MOLY-
PERMALLOY
T38 200µH
T38 150µH
T50 150µH
T50 200µH
T80 350µH
1082 GA
POWER OUTPUT (W)
0
EFFICIENCY (%)
4
1082 G01
1
2
3
79
76
73
70
67
64
61
58
55
V
IN
= –20V
V
IN
= –40V
V
IN
= –60V
V
IN
= –70V
NOTE: THIS GRAPH IS BASED ON LOW CORE LOSS
PERMALLOY INDUCTOR. IF POWDERED IRON CORE
INDUCTOR IS USED, THE CORE LOSS IS TYPICALLY
100mW HIGHER.
L = 250µH
R = 0.08Ω
Telecom 5V Supply Efficiency
OUTPUT VOLTAGE (V)
6
FREQUENCY (kHz)
54 32
1082 G02
80
70
60
50
40
30
20
10
0
10
T
A
= 25°C
5
LT1082
sn1082 1082fas
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Isolated Mode Flyback
Reference Voltage
TEMPERATURE (°C)
FLYBACK VOLTAGE (V)
25
24
23
22
21
20
19
18
17
16
15
1082 G09
–75
–50
50
100
25
150
175
–25
0
75 125
R
FB
= 3k
R
FB
= 6k
R
FB
= 10k
Supply Current vs Input Voltage**
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
200
160
120
80
40
0
30 50 80
1082 G15
10 20
40
60 70
V
C
= 50mV
V
C
= 0V
Supply Current vs Supply Voltage
(Shutdown Mode)
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (mA)
20 40
60
80
1082 G14
14
13
12
11
10
9
8
7
6
5
4
3
2
10 30
50 70
90% DUTY CYCLE
50% DUTY CYCLE
10% DUTY CYCLE
0% DUTY CYCLE
**UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
Feedback Bias Current vs
Temperature
TEMPERATURE (°C)
FEEDBACK BIAS CURRENT (nA)
1082 G12
800
700
600
500
400
300
200
100
0
–75
–50
50
100
25
150
175
–25
0
75 125
Normal/Feedback Mode
Threshold on Feedback Pin
TEMPERATURE (°C)
V
C
PIN VOLTAGE (mV)
750
725
700
675
650
625
600
575
550
525
500
1082 G16
–75
–50
50
100
25
150
175
–25
0
75 125
–24
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
V
C
PIN CURRENT (µA)
FEEDBACK PIN VOLTAGE
(AT THRESHOLD)
FEEDBACK PIN CURRENT
(AT THRESHOLD)
V
C
PIN VOLTAGE (mV)
SUPPLY CURRENT (µA)
200
180
160
140
120
100
80
60
40
20
0
1082 G17
0
10
50
70
40
90
100
20
30
60 80
–55°C ≤ T
J
≤ 125°C
T
J
= 150°C
Shutdown Mode Supply Current
Reference Voltage and Switching
Frequency vs Temperature
TEMPERATURE (°C)
FREQUENCY (kHz)
70
65
60
55
50
45
1082 G11
1.250
1.245
1.240
1.235
1.230
1.225
REFERENCE VOLTAGE (V)
–75
–50
50
100
25
150
175
–25
0
75 125
FREQ
V
REF
INPUT VOLTAGE (V)
0
REFERENCE VOLTAGE CHANGE (mV)
5
4
3
2
1
0
–1
–2
–3
–4
–5
20
40
50
1082 G10
10 30
60
70
80
T
J
= 25°C
T
J
= –55°C
T
J
= 150°C
Line Regulation
SWITCH CURRENT (A)
DRIVER CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
1082 G13
0
0.2
1.0
1.4
0.8
1.8
2.0
0.4
0.6
1.2 1.6
* AVERAGE SUPPLY CURRENT
= I
Q
+ DC(2.9 + 10
–2
I
SW
+ 10
–5
I
SW
2
)
I
Q
= QUIESCENT CURRENT, DC = DUTY CYCLE,
I
SW
= SWITCH CURRENT
Driver Current* vs Switch Current
6
LT1082
sn1082 1082fas
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
V
C
Pin Characteristics
FREQUENCY (Hz)
TRANSCONDUCTANCE (µmho)
1k 100k 1M 10M
1082 G24
10k
7000
6000
5000
4000
3000
2000
1000
0
–1000
θ
g
m
–30
0
30
60
90
120
150
180
210
PHASE (DEG)
Error Amplifier Transconductance
TEMPERATURE (°C)
–75
TRANSCONDUCTANCE (µmho)
–50
50
100
1082 G18
25
150
–25
0
75 125
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
g
m
=
∆I
∆V
(V
C
PIN)
(FB PIN)
Idle Supply Current vs
Temperature
TEMPERATURE (°C)
IDLE SUPPLY CURRENT (mA)
1082 G20
10
9
8
7
6
5
4
3
2
1
–75
–50
50
100
25
150
175
–25
0
75 125
V
C
= 0.6V
V
IN
= 75V
V
IN
= 3V
TEMPERATURE (°C)
V
C
VOLTAGE (mV)
1082 G19
400
350
300
250
200
150
100
50
0
–75
–50
50
100
25
150
175
–25
0
75 125
–400
–350
–300
–250
–200
–150
–100
–50
0
V
C
CURRENT (µA)
VOLTAGE AT V
C
PIN
CURRENT
(OUT OF V
C
PIN)
Shutdown Thresholds
Feedback Pin Clamp Voltage
SWITCH VOLTAGE (V)
SWITCH CURRENT (µA)
500
450
400
350
300
250
200
150
100
50
0
1082 G22
0
10
50
70
40
90
100
20
30
60 80
A. V
IN
= 3V
B. V
IN
= 15V
C. V
IN
= 40V
D. V
IN
= 55V
E. V
IN
= 75V
AB
DE
C
FEEDBACK CURRENT (mA)
0
FEEDBACK VOLTAGE (mV)
800
700
600
500
400
300
200
0.1
1082 G21
0.2
0.3 0.4
0.5
0.6
0.7 0.8 0.9
1.0
1.1
T
J
= –55°C
T
J
= 25°C
T
J
= 150°C
Switch “Off” Characteristics
Transconductance of Error
Amplifier
V
C
PIN VOLTAGE
(V)
V
C
PIN CURRENT (µA)
400
300
200
100
0
–100
–200
–300
–400
1082 G23
0
1.0
2.5
0.5
1.5 2.0
V
FB
= 0.8V
(CURRENT OUT OF V
C
PIN)
V
FB
= 1.5V
(CURRENT INTO V
C
PIN)
T
J
= 25°C
P1-P3P4-P6P7-P9P10-P12

LT1082IQ#TRPBF

Mfr. #:
Buy LT1082IQ#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1A Hi Voltage Switching Reg
Lifecycle:
New from this manufacturer.
Delivery:
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