LT3494A 查看數據表（PDF） - Linear Technology

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LT3494A

Micropower Low Noise Boost Converters with Output Disconnect

Linear Technology 

LT3494/LT3494A

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

temperature range, otherwise specifications are at TA = 25°C. VCC = 3V, VSHDN = VCC, unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

CTRL Pin Bias Current

VCTRL = 0.5V, Current Flows Out of Pin

●

20

100

nA

CTRL to FB Offset

VCTRL = 0.5V

8

15

mV

Maximum Shunt Current

VFB = 1.3V, VCAP = 5V

230

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 LT3494/LT3494A are guaranteed to meet performance

specifications from 0°C to 85°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: Internal reference voltage is determined by finding VFB voltage

level which causes quiescent current to increase 20μA above “Not

Switching” level.

Note 4: If CTRL is overriding the internal reference, Start-Up mode occurs

when VFB is less then half the voltage on CTRL. If CTRL is not overriding

the internal reference, Start-Up mode occurs when VFB is less then half the

voltage of the internal reference.

Note 5: Current limit guaranteed by design and/or correlation to static test.

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.

Switching Frequency

vs Load Currrent

1400

1200

1000

LT3494

FIGURE 5 CIRCUIT

VCC = 3.6V

VOUT = 16V

800

600

400

200

0

0.1

1

10

LOAD CURRENT (mA)

100

3494 G01

Load Regulation

2.0

LT3494

1.5 FIGURE 5 CIRCUIT

VCC = 3.6V

1.0 VOUT = 16V

0.5

0

–0.5

–1.0

–1.5

–2.0

0

5 10 15 20 25 30 35 40

LOAD CURRENT (mA)

3494 G02

VOUT vs CTRL Voltage

20

LT3494

FIGURE 5 CIRCUIT

VCC = 3.6V

15 VOUT = 16V

LOAD CURRENT = 1mA

10

5

0

0.1 0.3

0.5 0.7 0.9 1.1

CTRL VOLTAGE (V)

1.3 1.5

3494 G03

3494fb

3

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