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LT1176 Datasheet(PDF) 3 Page - Linear Technology

Part # LT1176
Description  Step-Down Switching Regulator
PDF  8 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1176 Datasheet(HTML) 3 Page - Linear Technology

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LT1176/LT1176-5
3
11765fb
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Switch ON Voltage (Note 2)
ISW = 0.2A
ISW = 1A
l
l
1.1
1.4
V
V
Switch OFF Leakage
VIN = 25V, VSW = 0
VIN = VMAX, VSW = 0 (Note 8)
150
250
µA
µA
Supply Current (Note 3)
VFB = 2.5V, VIN ≤ 35V
VSHDN = 0.1V (Device Shutdown) (Note 9)
l
l
7.5
140.0
10
300
mA
µA
Minimum Supply Voltage
Normal Mode
Startup Mode (Note 4)
l
l
7.3
3.5
8.0
4.8
V
V
Switch Current Limit (Note 5)
ILIM Open
RLIM = 10k (Note 6)
RLIM = 7k (Note 6)
l
1.2
1.7
1.2
0.8
2.2
A
A
A
Maximum Duty Cycle
l
85
90
%
Switching Frequency
VFB = 0V Through 2k (Note 5) (LT1176)
VSENSE = 0V (Note 5) (LT1176-5)
l
90
85
100
20
20
110
120
kHz
kHz
kHz
kHz
Switching Frequency Line Regulation
8V ≤ VIN ≤ VMAX (Note 8)
l
0.03
0.1
%/V
Error Amplifier Voltage Gain (Note 10)
1V ≤ VC ≤ 4V
2000
V/V
Error Amplifier Transconductance (Note 10)
3700
5000
8000
µmho
Error Amplifier Source and Sink Current
Source (VFB = 2V or VSENSE = 4V)
Sink (VFB = 2.5V or VSENSE = 5.5V)
100.0
0.7
140
1.0
225.0
1.6
µA
mA
Feedback Pin Bias Current (LT1176)
VFB = VREF
l
0.5
2
µA
Reference Voltage (LT1176)
VC = 2V
l
2.155
2.21
2.265
V
Reference Voltage Tolerance (LT1176)
VREF (Nominal) = 2.21V
All Conditions of Input Voltage, Output Voltage,
Temperature and Load Current
l
±0.5
±1.0
±2
±3
%
%
Sense Voltage (LT1176-5)
VC = 2V
l
4.85
5
5.15
V
Sense Voltage Tolerance (LT1176-5)
VOUT (Nominal) = 5V
All Conditions of Input Voltage,
Temperature and Load Current
l
±0.5
±0.1
±2
±3
%
%
Sense Pin Divider Resistance (LT1176-5)
3
5
8
kΩ
Output Voltage Line Regulation
8V ≤ VIN ≤ VMAX (Note 8)
l
0.005
0.02
%/V
VC Voltage at 0% Duty Cycle
Overtemperature
l
1.5
–4.0
V
mV/°C
Multiplier Reference Voltage
24
V
Shutdown Pin Current
VSHDN = 5V
VSHDN ≤ VTHRESHOLD (@2.5V)
l
l
5
10
20
50
µA
µA
Shutdown Thresholds
Switch Duty Cycle = 0
Fully Shutdown
l
l
2.2
0.1
2.45
0.30
2.7
0.5
V
V
Status Window
As a Percent of Output Voltage
±4
±5
±6
%
Status High Level
ISTATUS = 10µA Sourcing
l
3.5
4.5
5.0
V
The l 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.



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