LTC1574CS-5 datasheet(3/8 Pages) LINER

Part #	LTC1574CS-5

Description	High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode

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Manufacturer	LINER [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

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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