3

LT3473/LT3473A

3473f

The

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT3473EDD and LT3473AEDE are guaranteed to meet

performance specifications from 0°C to 70°C. Specifications over the

–40°C to 85°C operating temperature range are assured by design,

characterization and correlation with statistical process controls.

TYPICAL PERFOR A CE CHARACTERISTICS

Load Regulation (Feedback Taken

from CAP)

LOAD CURRENT (mA)

0

19.00

19.20

19.40

19.60

19.80

CAP

OUT

20.00

20.20

20

40

60

80

3473 G01

100

CTRL VOLTAGE (V)

0

0

0.2

0.6

0.8

1.0

1.4

0.2

1

1.4

3473 G02

0.4

1.2

0.8

1.8

2

0.4 0.6

1.2

1.6

CTRL VOLTAGE (V)

0

1.0

1.2

1.4

2

3473 G03

0.8

0.6

0.5

1

1.5

0.4

0.2

0

Feedback Voltage

PGOOD Threshold Voltage

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switching Frequency

0.9

1.2

1.4

MHz

Maximum Duty Cycle

●

88

92

%

Switch Current Limit

●

1.2

A

45

mV

Switch Leakage Current

0.1

5

µA

Schottky Forward Drop

0.45

V

Schottky Leakage Current

CAP = 36V, SW = 0V

4

µA

Disconnect PNP Voltage Drop

80

mV

250

mV

Disconnect PNP Quiescent Current

CAP = 20V

1.2

µA

Disconnect PNP Leakage Current

SHDN = OUT = 0V, CAP = 20V

0.01

0.1

µA

LTC3473A Only

NPN1 Voltage Drop

INE1 = 1mA

0.8

V

NPN1 Beta

INE1 = 1mA

60

NPN2 Voltage Drop

INE2 = 1mA

0.8

V

NPN2 Beta

INE2 = 1mA

60

Note 3: Failure to correctly solder the Exposed Pad of the package to the

PC board will result in a thermal resistance much higher than 40°C.