LT3505 datasheet(3/24 Pages) LINER

3 / 24 page

LT3505

3505fc

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3505E is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT3505I speciﬁcations are

guaranteed over the –40°C to 125°C temperature range.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Operating Range

3.6

Undervoltage Lockout

3.1

3.35

3.6

Feedback Voltage

765

780

795

FB Pin Bias Current

VFB = Measured VREF (Note 4)

150

Quiescent Current

Not Switching, RT = 75.0k

2.0

2.7

Quiescent Current in Shutdown

VSHDN = 0V

0.01

µA

Reference Line Regulation

VIN = 5V to 36V

0.007

%/V

Switching Frequency

VFB = 0.7V, RT = 13.7k

VFB = 0.7V, RT = 75.0k

VFB = 0.7V, RT = 357k

2.70

675

180

3.01

750

200

3.30

825

220

MHz

kHz

Maximum Duty Cycle

RT = 75.0k

Error Amp Transconductance

VFB = 0.78V

200

µA/V

Error Amp Voltage Gain

VFB = 0.78V

400

V/V

VC Source Current

VFB = 0V, VC = 1.5V

µA

VC Sink Current

VFB = 1V, VC = 1.5V

µA

VC Switching Threshold Voltage

IOUT = 0mA

0.9

VC Clamp Voltage

VFB = 0V

1.7

RT Bias Voltage

VFB = 0.6V

VFB = 0V, RT = 75.0k

0.5

Switch Current Limit

(Note 3)

1.4

1.75

2.2

Switch VCESAT

ISW = 1A

350

Switch Leakage Current

0.1

µA

Minimum Boost Voltage Above Switch

ISW = 1A

1.6

2.2

BOOST Pin Current

ISW = 1A

SHDN Input Voltage High

2.3

SHDN Input Voltage Low

0.3

SHDN Bias Current

VSHDN = 2.3V (Note 5)

VSHDN = 0V

0.01

0.1

µA

ELECTRICAL CHARACTERISTICS The

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2).

Note 3: Current limit guaranteed by design and/or correlation to static test.

Slope compensation reduces current limit at higher duty cycle.

Note 4: Current ﬂows out of pin.

Note 5: Current ﬂows into pin.

LT3505 Datasheet(PDF) 3 Page - Linear Technology

LT3505 Datasheet(HTML) 3 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL