LT3680I(RevA) Ver la hoja de datos (PDF) - Linear Technology

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LT3680I
(Rev.:RevA)

36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Current

Linear Technology 

LT3680

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

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

noted. (Note 2)

PARAMETER

Minimum Bias Voltage (BD Pin)

CONDITIONS

VBD = 0, Not Switching

MIN TYP MAX UNITS

1

5

μA

2.7

3

V

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

Switching Frequency

Minimum Switch Off-Time

Switch Current Limit

Switch VCESAT

Boost Schottky Reverse Leakage

Minimum Boost Voltage (Note 4)

BOOST Pin Current

RUN/SS Pin Current

RUN/SS Input Voltage High

RUN/SS Input Voltage Low

PG Threshold Offset from Feedback Voltage

PG Hysteresis

PG Leakage

PG Sink Current

SYNC Low Threshold

SYNC High Threshold

SYNC Pin Bias Current

VFB = 0.8V, VC = 0.4V

4V < VIN < 36V

RT = 8.66k

RT = 29.4k

RT = 187k

Duty Cycle = 5%

ISW = 3.5A

VBOOST = 10V, VBD = 0V

ISW = 1A

VRUN/SS = 2.5V

VFB Rising

VPG = 5V

VPG = 0.4V

VSYNC = 0V

780

● 775

●

2.2

1.0

200

●

4.6

●

0.2

● 200

0.5

790 800

790 805

10

40

0.002 0.01

500

2000

60

60

5.3

2.0

2.45 2.7

1.1 1.25

230 260

60

150

5.4

6.0

335

0.02

2

1.5

2.0

35

50

5

8

2.5

65

10

0.1

1

800

0.7

0.1

mV

mV

nA

%/V

μMho

μA

μA

A/V

V

MHz

MHz

kHz

nS

A

mV

μA

V

mA

μA

V

V

mV

mV

μA

μA

V

V

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 LT3680E is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT3680I specifications are

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

Note 3: Bias current flows out of the FB pin.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the switch.

3680fa

3

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