LT1072CS8#TR Linear Technology, LT1072CS8#TR Datasheet - Page 3

• Manufacturer Part Number: LT1072CS8#TR
• Description: IC SW REG 1.25A HI-EFF 8-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Cuk, Flyback, Forward Converterr

Specifications of LT1072CS8#TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 1.25A
• Frequency - Switching: 40kHz
• Voltage - Input: 3 ~ 60 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: LT1072CS8TR

ELECTRICAL CHARACTERISTICS
SYMBOL
V
I
gm
A
I
V
BV
V
I
∆I
∆I
f
DC (max)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Measured with V
temperature range. Unless otherwise specified, V
B
Q
LIM
REF
V
FB
SAT
IN
SW
PARAMETER
Reference Voltage
Feedback Input Current
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage
Supply Current
Control Pin Threshold
Normal/Flyback Threshold on Feedback Pin
Flyback Reference Voltage
Change in Flyback Reference Voltage
Flyback Reference Voltage
Line Regulation
Flyback Amplifier Transconductance (gm)
Flyback Amplifier Source
and Sink Current
Output Switch Breakdown
Voltage
Output Switch ON Resistance (Note 2)
Control Voltage to Switch Current Transconductance
Switch Current Limit
Supply Current Increase
During Switch ON Time
Switching Frequency
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode
Supply Current
Shutdown Mode
Threshold Voltage
C
in hi clamp, V
FB
= 0.8V.
IN
= 15V, V
The
C
CONDITlONS
V
V
∆I
V
Lo Clamp, V
3V ≤ V
V
0.9V ≤ V
3V ≤ V
Duty Cycle = 0
l
l
3V ≤ V
∆I
V
I
3V ≤ V
I
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 3)
3V ≤ V
V
3V ≤ V
Measured at Feedback Pin
Hi Clamp, V
0.05 ≤ I
I
FB
FB
FB
SW
SW
= 0.5V, V
C
FB
C
C
C
C
C
C
= 1.5V
= 0.8V
= 0.8V
= 50µA
= 50µA
= 0.6V
= 0.05V
= 50µA Sink
= ±25µA
= ±10µA
= V
= 1.5mA
= 1.25A
denotes specifications which apply over the full operating
IN
IN
IN
IN
IN
IN
REF
FB
C
≤ V
≤ V
≤ V
≤ V
≤ V
≤ V
Note 3: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I
Note 4: V
≤ 1.4V
≤ 1mA
FB
FB
FB
MAX
MAX
MAX
MAX
MAX
MAX
Source
= 1V
= 1.5V
= V
, V
(Note 4)
REF
C
MAX
= 0.6V
, output pin open.
= 55V for LT1072HV to avoid switch breakdown.
LT1072
LT1072HV
LT1072S8
T
T
J
J
≥ 25°C
< 25°C
LIM
1.224
1.214
3000
2400
0.25
1.25
1.25
MIN
150
120
500
150
100
1.8
0.8
0.6
0.4
4.5
15
14
15
25
65
75
60
35
33
90
50
1
= 0.833 (2 – DC).
1.244
1.244
4400
0.38
0.45
16.3
0.01
TYP
350
200
800
300
100
150
2.6
0.9
6.8
0.6
1.5
32
40
90
90
80
25
40
92
6
2
LT1072
1.264
1.274
MAX
1100
6000
7000
0.52
0.03
1.08
1.25
17.6
0.03
0.54
750
350
400
650
250
250
300
2.3
3.0
8.5
3.5
2.5
18
70
70
35
45
47
97
9
1
3
UNITS
µmho
µmho
µmho
mA/A
1072fc
3
%/V
%/V
%/V
%/V
kHz
kHz
V/V
A/V
mA
mV
mV
nA
nA
µA
µA
µA
µA
µA
µs
%
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A