LT1936H データシートの表示（PDF） - Linear Technology

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LT1936H

1.4A, 500kHz Step-Down Switching Regulator

Linear Technology 

LT1936

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2)

VC Clamp

VC Switch Threshold

Internal Compensation R

1.8

V

0.7

V

50

kΩ

Internal Compensation C

COMP Pin Leakage

VCOMP = 1V

VCOMP = 1.8V, E and I Grades

H Grade

150

pF

●

1

μA

●

2

μA

Switching Frequency

Maximum Duty Cycle

VFB = 1.1V

VFB = 0V

400

500

600

kHz

40

kHz

● 87

92

%

Switch Current Limit

(Note 3)

1.9

2.2

2.6

A

Switch VCESAT

Switch Leakage Current

ISW = 1.2A

410

520

mV

2

μA

Minimum BOOST Voltage Above SW

BOOST Pin Current

BOOST Pin Leakage

SHDN Input Voltage High

SHDN Input Voltage Low

SHDN Pin Current

ISW = 1.2A

ISW = 1.2A

VSW = 0V

VSHDN = 2.3V (Note 5)

VSHDN = 12V (Note 5)

VSHDN = 0V

2

2.2

V

28

50

mA

0.1

1

μA

2.3

V

0.3

V

34

50

μA

140

240

μA

0.01

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 LT1936E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT1936I specifications are

guaranteed over the –40°C to 125°C temperature range. The LT1936H

specifications are guaranteed over the –40°C to 150°C temperature range.

Note 3: Current limit guaranteed by design and/or correlation to static test.

Slope compensation reduces current limit at higher duty cycle.

Note 4: Current flows out of pin.

Note 5: Current flows into pin.

TYPICAL PERFORMANCE CHARACTERISTICS

Efficiency, VOUT = 5V

100

90

VIN = 12V

VIN = 24V

80

70

60

0

VOUT = 5V

TA = 25°C

D1 = DFLS140L

L1 = 15μH, TOKO D63CB

0.5

1.0

1.5

LOAD CURRENT (A)

1936 G01

Efficiency, VOUT = 3.3V

100

90

80

70

60

0

VIN = 5V

VIN = 12V

VIN = 24V

VOUT = 3.3V

TA = 25°C

D1 = DFLS140L

L1 = 10μH, TOKO D63CB

0.5

1.0

1.5

LOAD CURRENT (A)

1936 G02

Switch Current Limit

3.0

2.5

TYP

2.0

MIN

1.5

1.0

0.5

0

0

20

40

60

80

100

DUTY CYCLE (%)

1936 G03

1936fd

3

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