LTC1574-5 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1574-5' PDF : 8 Pages View PDF
LTC1574
LTC1574-3.3/LTC1574-5
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IIL
Shutdown Pin Input Current
0 ≤ VSHUTDOWN ≤ 0.8V
VF
Schottky Diode Forward Voltage Forward Current = 200mA
IR
Schottky Reverse Current
Reverse Voltage = 5V
Reverse Voltage = 18.5V
0.5
µA
0.450 0.570
V
10 25
µA
100 250
µA
The q denotes specifications which apply over the full operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
TJ = TA + (PD × 110°C/W)
Note 2: Guaranteed by Design.
Note 3: Does not include Schottky reverse current. Dynamic supply
current is higher due to the gate charge being delivered at the switching
frequency.
Note 4: 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
CTX50-4
90
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
160 VIN = 13.5V
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
ILOAD = 100mA
IPGM = 0V
IPGM = VIN
91
90
89
5 6 7 8 9 10 11 12 13 14
INPUT VOLTAGE (V)
1574 • TPC03
Switch Resistance vs
Input Voltage
1.7
1.6
TA = 25°C
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
Share Link: 
