LT3685E 查看數據表（PDF） - Linear Technology

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LT3685E

36V, 2A, 2.4MHz Step-Down Switching Regulator

Linear Technology 

LT3685

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

Quiescent Current from BD

Minimum Bias Voltage (BD Pin)

Feedback Voltage

FB Pin Bias Current (Note 3)

FB Voltage Line Regulation

Error Amp gm

Error Amp Gain

CONDITIONS

VRUN/SS = 0.2V

VBD = 3V, Not Switching

VBD = 0, Not Switching

VC = 1.2V

4V < VIN < 36V

MIN

●

780

● 775

●

TYP MAX

0.01 0.5

0.9

1.3

1

5

2.7

3

790 800

790 805

7

30

0.002 0.01

500

1000

UNITS

μA

mA

μA

V

mV

mV

nA

%/V

μMho

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

RT = 8.66k

RT = 29.4k

RT = 187k

Duty Cycle = 5%

ISW = 2A

VSW = 10V, VBD = 0V

ISW = 1A

VRUN/SS = 2.5V

VFB Rising

VPG = 5V

VPG = 0.4V

45

μA

45

μA

3.5

A/V

2

V

2.1

2.4

2.7

MHz

0.9

1

1.15

MHz

160

200

240

kHz

●

60

150

nS

3.2

3.7

4.2

A

500

mV

0.02

2

μA

●

1.5

2.1

V

22

35

mA

5

10

μA

2.5

V

0.2

V

90

mV

12

mV

0.1

1

μA

● 100

600

μA

0.5

V

SYNC High Threshold

0.7

V

SYNC Pin Bias Current

VSYNC = 0V

0.1

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 LT3685E 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 LT3685I 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.

Note 5: Absolute Maximum Voltage at VIN and RUN/SS pins is 60V for

nonrepetitive 1 second transients, and 40V for continuous operation.

3685fb

3

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