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LT1074CT Datasheet(PDF) 3 Page - Linear Technology

Part # LT1074CT
Description  Step-Down Switching Regulator
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1074CT Datasheet(HTML) 3 Page - Linear Technology

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LT1074/LT1076
3
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C, VIN = 25V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Switch “On” Voltage (Note 2)
LT1074
ISW = 1A, Tj ≥ 0°C
1.85
V
ISW = 1A, Tj < 0°C
2.1
V
ISW = 5A, Tj ≥ 0°C
2.3
V
ISW = 5A, Tj < 0°C
2.5
V
LT1076
ISW = 0.5A
q
1.2
V
ISW = 2A
q
1.7
V
Switch “Off” Leakage
LT1074
VIN ≤ 25V, VSW = 0
5
300
µA
VIN = VMAX, VSW = 0 (Note 8)
10
500
µA
LT1076
VIN = 25V, VSW = 0
150
µA
VIN = VMAX, VSW = 0 (Note 8)
250
µA
Supply Current (Note 3)
VFB = 2.5V, VIN ≤ 40V
q
8.5
11
mA
40V < VIN < 60V
q
912
mA
VSHUT = 0.1V (Device Shutdown) (Note 9)
q
140
300
µA
Minimum Supply Voltage
Normal Mode
q
7.3
8
V
Startup Mode (Note 4)
q
3.5
4.8
V
Switch Current Limit (Note 5)
LT1074
ILIM Open
q
5.5
6.5
8.5
A
RLIM = 10k (Note 6)
4.5
A
RLIM = 7k (Note 6)
3
A
LT1076
ILIM Open
q
2
2.6
3.2
A
RLIM = 10k (Note 6)
1.8
A
RLIM = 7k (Note 6)
1.2
A
Maximum Duty Cycle
q
85
90
%
Switching Frequency
90
100
110
kHz
Tj ≤ 125°C
q
85
120
kHz
Tj > 125°C
q
85
125
kHz
VFB = 0V through 2kΩ (Note 5)
20
kHz
Switching Frequency Line Regulation
8V
≤ VIN ≤ VMAX (Note 8)
q
0.03
0.1
%/V
Error Amplifier Voltage Gain (Note 7)
1V
≤ VC ≤ 4V
2000
V/V
Error Amplifier Transconductance
3700
5000
8000
µmho
Error Amplifier Source and Sink Current
Source (VFB = 2V)
100
140
225
µA
Sink (VFB = 2.5V)
0.7
1
1.6
mA
Feedback Pin Bias Current
VFB = VREF
q
0.5
2
µA
Reference Voltage
VC = 2V
q
2.155
2.21
2.265
V
Reference Voltage Tolerance
VREF (Nominal) = 2.21V
±0.5
±1.5
%
All Conditions of Input Voltage, Output
q
±1
±2.5
%
Voltage, Temperature and Load Current
Reference Voltage Line Regulation
8V
≤ VIN ≤ VMAX (Note 8)
q
0.005
0.02
%/V
VC Voltage at 0% Duty Cycle
1.5
V
Over Temperature
q
– 4
mV/
°C
Multiplier Reference Voltage
24
V
Shutdown Pin Current
VSH = 5V
q
510
20
µA
VSH ≤ VTHRESHOLD (≅2.5V)
q
50
µA
Shutdown Thresholds
Switch Duty Cycle = 0
q
2.2
2.45
2.7
V
Fully Shut Down
q
0.1
0.3
0.5
V
Thermal Resistance Junction to Case
LT1074
2.5
°C/W
LT1076
4.0
°C/W
ELECTRICAL CHARACTERISTICS


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