LT1939EDD datasheet(2/24 Pages) LINER

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LT1939

1939f

The

l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TJ = 25°C. VVIN = 15V, VRT/SYNC = 2V, unless otherwise speciﬁed.

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

VIN, PG, PG Operating.................................... 25V/–0.3V

SW .............................................................................VIN

BST ................................................................ 45V/–0.3V

BST Pin Above SW....................................................25V

LDRV, SHDN..............................................................15V

FB, LFB, RT/SYNC .......................................................5V

SS, VC ......................................................................2.5V

Operating Junction Temperature Range (Notes 2, 6)

LT1939EDD ........................................ –40°C to 125°C

LT1939IDD......................................... –40°C to 125°C

Storage Temperature Range................... –65°C to 150°C

(Note 1)

TOP VIEW

DD PACKAGE

12-LEAD (3mm × 3mm) PLASTIC DFN

BST

LDRV

LFB

VIN

SHDN

RT/SYNC 6

θJA = 45°C/W, θJC(PAD) = 10°C/W

EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT1939EDD#PBF

LT1939IDD#PBF

LT1939EDD#TRPBF

LT1939IDD#TRPBF

LDJZ

12-Lead (3mm × 3mm) Plastic DFN

–40°C to 125°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based ﬁnish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to: http://www.linear.com/tapeandreel/

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SHDN Threshold

710

760

780

SHDN Source Current

1.5

2.5

3.5

μA

SHDN Current Hysterisis

1.25

3.25

μA

Minimum Input Voltage (Note 3)

VFB = 0V

2.4

2.8

Supply Shutdown Current

VSHDN = 0V

μA

Supply Quiescent Current

VFB = 0.9V

2.5

3.5

FB Voltage

VVC = 1V

VVC = 0.6V to 1.6V, VIN = 3V to 25V

0.784

0.776

0.8

0.816

0.824

FB Bias Current

VFB = 0.8V, VVC = 1V

150

Error Ampliﬁer gm

VVC = 1V, IVC = ±10μA

150

250

350

μmho

Error Ampliﬁer Source Current

VFB = 0.6V, VVC = 1V

μA

Error Ampliﬁer Sink Current

VFB = 1V, VVC = 1V

μA

Error Ampliﬁer High Clamp

VFB = 0.6V

1.8

2.0

2.2

Error Ampliﬁer Switching Threshold

VFB = 0.6V

0.6

0.8

1.0

SS Source Current

VSHDN = 1V, VSS = 0.4V, VFB = 0.9V

2.25

2.75

3.75

μA

ORDER INFORMATION

ELECTRICAL CHARACTERISTICS

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