LT1765ES8 datasheet(3/20 Pages) LINER

3 / 20 page

LT1765/LT1765-1.8/LT1765-2.5/

LT1765-3.3/LT1765-5

1765fd

ELECTRICAL CHARACTERISTICS

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 LT1765E is guaranteed to meet performance speciﬁcations

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

junction temperature range are assured by design, characterization and

correlation with statistical process controls.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Switch Current Limit

346

Oscillator Frequency

3.3V < VIN < 25V

1.1

1.25

1.6

MHz

Switch On Voltage Drop

I = 3A

270

430

VIN Undervoltage Lockout

(Note 3)

2.47

2.6

2.73

VIN Supply Current

1.3

Shutdown Supply Current

VSHDN = 0V, VIN = 25V, VSW = 0V

μA

Feedback Voltage

3V < VIN < 25V, 0.4V < VC < 0.9V

(Note 3)

LT1765 (Adj)

1.182

1.176

1.2

1.218

1.224

LT1765-1.8

1.764

1.8

1.836

LT1765-2.5

2.45

2.5

2.55

LT1765-3.3

3.234

3.3

3.366

LT1765-5

4.9

5.1

FB Input Current

LT1765 (Adj)

–0.25

–0.5

μA

FB Input Resistance

LT1765-1.8

LT1765-2.5

LT1765-3.3

LT1765-5

10.5

14.7

27.5

kΩ

FB Error Amp Voltage Gain

0.4V < VC < 0.9V

150

350

FB Error Amp Transconductance

ΔIVC = ±10μA

500

850

1300

μMho

VC Pin Source Current

VFB = VNOM – 17%

120

160

μA

VC Pin Sink Current

VFB = VNOM + 17%

110

180

μA

VC Pin to Switch Current Transconductance

5A/V

VC Pin Minimum Switching Threshold

Duty Cycle = 0%

0.4

VC Pin 3A ISW Threshold

0.9

Maximum Switch Duty Cycle

VC = 1.2V, ISW = 800mA, VIN = 6V

Minimum Boost Voltage Above Switch

ISW = 3A

1.8

2.7

Boost Current

ISW = 1A (Note 4)

ISW = 3A (Note 4)

140

SHDN Threshold Voltage

1.27

1.33

1.40

SHDN Threshold Current Hysteresis

μA

SHDN Input Current (Shutting Down)

SHDN = 60mV Above Threshold

–7

–10

–13

μA

SYNC Threshold Voltage

1.5

2.2

SYNC Input Frequency

1.6

MHz

SYNC Pin Resistance

ISYNC = 1mA

kΩ

The

l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C.

VIN = 15V, VC = 0.8V, Boost = VIN + 5V, SHDN, SYNC and switch open unless otherwise noted.

Note 3: Minimum input voltage is deﬁned as the voltage where the internal

regulator enters lockout. Actual minimum input voltage to maintain a

regulated output will depend on output voltage and load current. See

Applications Information.

Note 4: Current ﬂows into the BOOST pin only during the on period of the

switch cycle.

LT1765ES8 데이터시트(PDF) 3 Page - Linear Technology

LT1765ES8 데이터시트(HTML) 3 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

데이터시트 다운로드

링크 URL