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LTC1574CS Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1574CS
Description  High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode
PDF  8 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1574CS Datasheet(HTML) 3 Page - Linear Technology

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LTC1574
LTC1574-3.3/LTC1574-5
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
UNITS
IIH
SHDN Pin Input Current
SHDN = 16V
2
µA
IIL
SHDN Pin Input Current
0
≤ SHDN ≤ 0.8V
0.5
µA
VF
Schottky Diode Forward Voltage
Forward Current = 200mA
0.450
0.570
V
IR
Schottky Reverse Current
Reverse Voltage = 5V
10
25
µA
Reverse Voltage = 18.5V
100
250
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 Input Voltage
Efficiency vs Load Current
Efficiency vs Load Current
Switch Resistance vs
Input Voltage
Switch Leakage Current
vs Temperature
Efficiency Using Different Types
of Inductor Core Material
ELECTRICAL CHARACTERISTICS
LOAD CURRENT (mA)
1
10
100
1574 • TPC01
500
100
90
80
70
60
50
L = 50
µH
VOUT = 3.3V
IPGM = VIN
COIL = CTX50-4
VIN = 5V
VIN = 9V
LOAD CURRENT (mA)
1
10
100
1574 • TPC02
400
100
95
90
85
80
75
70
L = 50
µH
VOUT = 5V
IPGM = VIN
COIL = CTX50-4
VIN = 6V
VIN = 9V
INPUT VOLTAGE (V)
5
7
9
10
14
1574 • TPC03
68
11
12
13
95
94
93
92
91
90
89
VOUT = 5V
L = 100
µH
COIL = CTX100-4
ILOAD = 300mA
IPGM = VIN
ILOAD = 100mA
IPGM = 0V
LOAD CURRENT (mA)
1
10
100
500
100
90
80
70
60
50
VIN = 5V
VOUT = 3.3V
IPGM = VIN
CTX50-4
CTX50-4P
1574 • TPC04
TEMPERATURE (
°C)
0
180
160
140
120
100
80
60
40
20
0
40
80
100
1574 • TPC05
20
60
VIN = 13.5V
INPUT VOLTAGE (V)
4
12
1574 • TPC06
6
8
10
14
16
18
20
TA = 25°C
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7



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