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LT1172CQ Datasheet(PDF) 3 Page - Linear Technology

Part # LT1172CQ
Description  100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1172CQ Datasheet(HTML) 3 Page - Linear Technology

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3
LT1170/LT1171/LT1172
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VREF
Reference Voltage
Measured at Feedback Pin
1.224
1.244
1.264
V
VC = 0.8V
q
1.214
1.244
1.274
V
IB
Feedback Input Current
VFB = VREF
350
750
nA
q
1100
nA
gm
Error Amplifier
∆IC = ±25µA
3000
4400
6000
µmho
Transconductance
q
2400
7000
µmho
Error Amplifier Source or
VC = 1.5V
150
200
350
µA
Sink Current
q
120
400
µA
Error Amplifier Clamp
Hi Clamp, VFB = 1V
1.80
2.30
V
Voltage
Lo Clamp, VFB = 1.5V
0.25
0.38
0.52
V
Reference Voltage Line
3V
≤ VIN ≤ VMAX
q
0.03
%/V
Regulation
VC = 0.8V
AV
Error Amplifier Voltage Gain
0.9V
≤ VC ≤ 1.4V
500
800
V/V
Minimum Input Voltage (Note 5)
q
2.6
3.0
V
IQ
Supply Current
3V
≤ VIN ≤ VMAX, VC = 0.6V
6
9
mA
Control Pin Threshold
Duty Cycle = 0
0.8
0.9
1.08
V
q
0.6
1.25
V
Normal/Flyback Threshold
0.4
0.45
0.54
V
on Feedback Pin
VFB
Flyback Reference Voltage
IFB = 50µA
15.0
16.3
17.6
V
(Note 5)
q
14.0
18.0
V
Change in Flyback Reference
0.05
≤ IFB ≤ 1mA
4.5
6.8
9
V
Voltage
Flyback Reference Voltage
IFB = 50µA
0.01
0.03
%/V
Line Regulation (Note 5)
7V
≤ VIN ≤ VMAX
Flyback Amplifier
∆IC = ±10µA
150
300
650
µmho
Transconductance (gm)
Flyback Amplifier Source
VC = 0.6V
Source
q
15
32
70
µA
and Sink Current
IFB = 50µASink
q
25
40
70
µA
BV
Output Switch Breakdown
3V
≤ VIN ≤ VMAX,
LT1170/LT1171/LT1172
q
65
90
V
Voltage
ISW = 1.5mA
LT1170HV/LT1171HV/LT1172HV
q
75
90
V
LT1172S8
q
60
80
V
VSAT
Output Switch
LT1170
q
0.15
0.24
“On” Resistance (Note 3)
LT1171
q
0.30
0.50
LT1172
q
0.60
1.00
Control Voltage to Switch
LT1170
8
A/V
Current Transconductance
LT1171
4
A/V
LT1172
2
A/V
ILIM
Switch Current Limit
(LT1170)
Duty Cycle = 50%
TJ ≥ 25°C
q
510
A
Duty Cycle = 50%
TJ < 25°C
q
511
A
Duty Cycle = 80% (Note 4)
q
410
A
(LT1171)
Duty Cycle = 50%
TJ ≥ 25°C
q
2.5
5.0
A
Duty Cycle = 50%
TJ < 25°C
q
2.5
5.5
A
Duty Cycle = 80% (Note 4)
q
2.0
5.0
A
(LT1172)
Duty Cycle = 50%
TJ ≥ 25°C
q
1.25
3.0
A
Duty Cycle = 50%
TJ < 25°C
q
1.25
3.5
A
Duty Cycle = 80% (Note 4)
q
1.00
2.5
A
The q denotes the specifications which apply over the full operating tem-
perature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
ELECTRICAL CHARACTERISTICS


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