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LT3681

36V, 2A, 2.8MHz Step-Down Switching Regulator with Integrated Power Schottky Diode

Linear Technology 

LT3681

ABSOLUTE AXI U RATI GS

(Note 1)

VIN, RUN/SS Voltage.................................................36V

BOOST Pin Voltage ...................................................56V

BOOST Pin Above SW Pin.........................................30V

FB, RT, VC Voltage.......................................................5V

BIAS, PG, BD Voltage................................................30V

Maximum Junction Temperature .......................... 125°C

DC above DA.............................................................40V

Operating Temperature Range (Note 2)

LT3681E............................................... –40°C to 85°C

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

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

PG 1

BIAS 2

FB 3

GND 4

VC 5

RT 6

GND 7

14 RUN/SS

15

13 VIN

12 SW

11 BOOST

10 BD

16

9 DC

8 DA

DE14MA PACKAGE

14-LEAD (4mm ´ 3mm) PLASTIC DFN

TJMAX = 125°C, θJA = 43°C/W

EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB

EXPOSED PAD PIN 16 IS DC

ORDER PART NUMBER DE PART MARKING

LT3681EDE

3681

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts specified with wider operating temperature ranges.

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V, VBOOST = 15V, VBIAS = 3.3V unless otherwise

noted. (Note 2)

PARAMETER

Minimum Input Voltage

Quiescent Current from VIN

Quiescent Current from BIAS

Minimum Bias Voltage

Feedback Voltage

FB Pin Bias Current (Note 3)

FB Voltage Line Regulation

Error Amp GM

Error Amp Gain

VC Source Current

VC Sink Current

VC Pin to Switch Current Gain

VC Clamp Voltage

CONDITIONS

VRUN/SS = 0.2V

VBIAS = 3V, Not Switching

VBIAS = 0, Not Switching

VRUN/SS = 0.2V

VBIAS = 3V, Not Switching

VBIAS = 0, Not Switching

VFB = 1.25V, VC = 0.4V

4V < VIN < 34V

MIN

●

●

●

1.25

● 1.24

●

TYP MAX

3

3.6

0.01 0.5

22

60

75

120

0.01 0.5

50

120

0

5

2.7

3

1.265 1.29

1.265 1.3

30

100

0.002 0.02

330

800

65

85

3.5

2

UNITS

V

μA

μA

μA

μA

μA

μA

V

V

V

nA

%/V

μMho

μA

μA

A/V

V

3681f

2

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