LT3507HUHF-PBF datasheet(3/28 Pages) LINER

部件名	LT3507HUHF-PBF

功能描述	Triple Monolithic Step-Down Regulator with LDO

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LT3507

3

3507f

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN1, VIN2, VIN3 = 12V, VBOOST1, VBOOST2, VBOOST3 = 17V, unless

otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VC Source Current

VC = 0.6V

100

μA

VC Sink Current

VC = 0.6V

100

μA

VC Clamp Voltage

1.7

V

Switching Frequency

RT = 40.2k

l

0.9

1.1

MHz

Switching Phase

SW1 to SW2,3, RT = 40.2k

180

Deg

Foldback Frequency

VFB = 0V, RT = 40.2k

120

kHz

Frequency Shift Threshold on FB

0.4

V

RUN Threshold

1

1.5

V

PGOOD Output Voltage Low

IPGOOD = 200μA

0.2

0.4

V

PGOOD Pin Leakage

VPGOOD = 2V

10

400

nA

PGOOD Threshold Offset

VFB Rising

58

80

105

mV

Feedback Pin Voltage

l

788

800

812

mV

Feedback Pin Bias Current

l

–50

–500

nA

Error Ampliﬁer Transconductance

330

μS

Error Ampliﬁer Voltage Gain

500

V/V

VC Switching Threshold

0.9

V

Switch Leakage Current

0.01

10

μA

Minimum Boost Voltage Above Switch (Note 4)

1.8

2.5

V

Converter 1

VC1 to Switch Current Gain

5A/V

Switch 1 Current Limit (Note 3)

Duty Cycle = 15%

l

3

4.3

6

A

Switch 1 VCESAT

ISW1 = 2A

400

600

mV

BOOST1 Operating Current

ISW1 = 2A

40

60

mA

Converter 2

VC2 to Switch Current Gain

3.6

A/V

Switch 2 Current Limit (Note 3)

Duty Cycle = 15%

l

2

2.9

4

A

Switch 2 VCESAT

ISW2 = 1.5A

350

500

mV

BOOST2 Operating Current

ISW2 = 1.5A

40

60

mA

Converter 3

VC3 to Switch Current Gain

3.6

A/V

Switch 3 Current Limit (Note 3)

Duty Cycle = 15%

l

2

2.9

4

A

Switch 3 VCESAT

ISW3 = 1.5A

350

500

mV

BOOST3 Operating Current

ISW3 = 1.5A

40

60

mA

LDO Regulator

Feedback Pin Voltage

l

788

800

812

mV

Feedback Pin Bias Current

–150

–500

nA

Error Ampliﬁer Voltage Gain

1100

V/V

Line Regulation

VIN from 5V to 36V

0.05

%/V

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