LT3504 Просмотр технического описания (PDF) - Linear Technology

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LT3504

Quad 40V/1A Step-Down Switching Regulator with 100% Duty Cycle Operation

Linear Technology 

LT3504

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V unless otherwise noted.

SYMBOL

CONDITIONS

MIN

TYP

MAX

RUN/SS Pin Source Current

RUN/SS Pin Threshold for Switching

Feedback Voltage

VRUN/SS = 0V

VFB = 0V

1.3

50

100

790

800

810

l 784

800

816

FB Pin Current

VFB = Measured VFB (Note 5)

l

15

150

Reference Line Regulation

VIN = 5V to 40V

–0.015

SKY Pin Current

SKY Voltage above VIN Voltage

Switching Frequency

ISW = 1A

VSKY – VIN

RT = 6.34k

RT = 18.2k

RT = 100k

27

40

4.85

l 1.8

2.1

2.4

l 0.85

1

1.15

l 200

250

300

Switching Phase

SYNC Threshold Voltage

RT = 18.2k

150

180

210

1.25

SYNC Input Frequency

0.35

2.2

Switch Current Limit (SW1,2,3,4)

(Note 6)

1.45

1.75

2.1

Switch VCESAT (SW1,2,3,4)

ISW = 1A

400

Switch Leakage Current (SW1,2,3,4)

0.1

2

Catch Diode Current Limit (SW1,2,3,4)

FB = 0V

FB = 0.7V

0.75

1.15

1.33

1.0

1.45

1.67

Switch Current Limit (SW5)

(Note 6)

220

320

Switch VCESAT (SW5)

Switch Leakage Current (SW5)

ISW = 200mA

230

0.1

2

Boost Diode Current Limit (SW5)

PG Threshold Offset

VIN = 5V

VFB Rising

350

450

65

90

125

PG Hysteresis

VFB Rising – VFB Falling

35

PG Voltage Output Low

PG Pin Leakage

IPG = 250µA

VPG = 2V

180

300

0.01

1

UNITS

µA

mV

mV

mV

nA

%/V

mA

V

MHz

MHz

kHz

Deg

V

MHz

A

mV

µA

A

A

mA

mV

µA

mA

mV

mV

mV

µA

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 LT3504EUF is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3504IUF is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 3: Current flows into pin.

Note 4: Quiescent current (VIN) is measured at VEN/UVLO = 1V

Note 5: Current flows out of pin.

Note 6: Current limit is guaranteed by design and/or correlation to static

test. Slope compensation reduces current limit at higher duty cycles.

Note 7: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

For more information www.linear.com/LT3504

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