LT1173 データシートの表示（PDF） - Linear Technology
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LT1173 Datasheet PDF : 16 Pages
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LT1173
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V, unless otherwise noted.
SYMBOL
VSAT
PARAMETER
SWSAT Voltage, Step-Down Mode
AV
Gain Block Gain
Current Limit
Current Limit Temperature Coeff.
Switch OFF Leakage Current
VSW2
Maximum Excursion Below GND
CONDITIONS
VIN = 12V, ISW = 650mA
RL = 100kΩ (Note 3)
220Ω to ILIM to VIN
Measured at SW1 Pin
ISW1 ≤ 10µA, Switch Off
MIN
q
q
400
q
TYP
1.1
1000
400
– 0.3
1
– 400
MAX
1.5
1.7
10
– 350
UNITS
V
V
V/V
mA
%/°C
µA
mV
The q denotes the specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
Note 2: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed output versions
will always be within the specified range.
Note 3: 100kΩ resistor connected between a 5V source and the AO pin.
TYPICAL PERFOR A CE CHARACTERISTICS
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
1.2
1.0
VIN= 3.0V
0.8
VIN= 2.0V
VIN= 5.0V
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2
ISWITCH (A)
LT1173 • TPC01
Switch ON Voltage
Step-Down Mode
(SW1 Pin Connected to VIN)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
ISWITCH (A)
LT1173 • TPC02
Maximum Switch Current vs
RLIM Step-Down Mode
1000
900
VOUT = 5V
800
VIN = 24V
L = 500µH
700
600
500
VIN = 12V
L = 250µH
400
300
200
100
0
100
1000
RLIM (Ω)
LT1173 • TPC09
Set Pin Bias Current vs
Temperature
20
VIN = 3V
15
10
5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1173 •TPC04
Maximum Switch Current vs
RLIM Step-Up Mode
1200
1100
2V ≤ VIN ≤ 5V
1000
900
800
700
600
500
400
300
200
100
10
100
1000
RLIM (Ω)
LT1173 • TPC03
Feedback Pin Bias Current vs
Temperature
18
VIN = 3V
16
14
12
10
8
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1173 •TPC05
3
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