LTC1574CS(RevA) 查看數據表（PDF） - Linear Technology
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LTC1574CS
(Rev.:RevA)
(Rev.:RevA)
Linear Technology
LTC1574CS Datasheet PDF : 8 Pages
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LTC1574
LTC1574-3.3/LTC1574-5
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 9V, SHDN = VIN, IPGM = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IIH
SHDN Pin Input Current
SHDN = 16V
2
IIL
SHDN Pin Input Current
0 ≤ SHDN ≤ 0.8V
0.5
VF
Schottky Diode Forward Voltage Forward Current = 200mA
0.450 0.570
IR
Schottky Reverse Current
Reverse Voltage = 5V
Reverse Voltage = 18.5V
10 25
100 250
UNITS
µA
µA
V
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
TJ = TA + (PD • 110°C/W)
Note 3: Guaranteed by design.
Note 4: Does not include Schottky reverse current. Dynamic supply
current is higher due to the gate charge being delivered at the switching
frequency.
Note 5: Current into Pin 5 only, measured without electrolytic input
capacitor.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
100
90
VIN = 5V
80
VIN = 9V
70
L = 50µH
60
VOUT = 3.3V
IPGM = VIN
COIL = CTX50-4
50
1
10
100
500
LOAD CURRENT (mA)
1574 • TPC01
Efficiency Using Different Types
of Inductor Core Material
100
90
CTX50-4
CTX50-4P
80
70
60
VIN = 5V
VOUT = 3.3V
IPGM = VIN
50
1
10
100
500
LOAD CURRENT (mA)
1574 • TPC04
Efficiency vs Load Current
100
95
VIN = 6V
90
VIN = 9V
85
80
L = 50µH
75
VOUT = 5V
IPGM = VIN
COIL = CTX50-4
70
1
10
100
400
LOAD CURRENT (mA)
1574 • TPC02
Switch Leakage Current
vs Temperature
180
VIN = 13.5V
160
140
120
100
80
60
40
20
0
0
20
40
60
80 100
TEMPERATURE (°C)
1574 • TPC05
Efficiency vs Input Voltage
95
VOUT = 5V
94
L = 100µH
COIL = CTX100-4
93
92
ILOAD = 300mA
IPGM = VIN
91
ILOAD = 100mA
IPGM = 0V
90
89
5 6 7 8 9 10 11 12 13 14
INPUT VOLTAGE (V)
1574 • TPC03
Switch Resistance vs
Input Voltage
1.7
TA = 25°C
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1574 • TPC06
3
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