3800EFE データシートの表示（PDF） - Linear Technology

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3800EFE

High-Voltage Synchronous Current Mode Step-Down Controller

Linear Technology 

LT3800

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: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 3: The LT3800E is guaranteed to meet performance specifications from

0°C to 125°C junction temperature. Specifications over the –40°C to 125°C

operating junction temperature range are assured by design, characterization

and correlation with statistical process controls. The LT3800I is guaranteed

over the full –40°C to 125°C operating junction temperature range.

Note 4: VIN voltages below the start-up threshold (7.5V) are only

supported when VCC is externally driven above 6.5V.

Note 5: Operating range dictated by MOSFET absolute maximum gate-

source voltage ratings.

Note 6: Supply current specification does not include switch drive

currents. Actual supply currents will be higher.

Note 7: DC measurement of gate drive output “ON” voltage is typically

8.6V. Internal dynamic bootstrap operation yields typical gate “ON”

voltages of 9.8V during standard switching operation. Standard operation

gate “ON” voltage is not tested but guaranteed by design.

TYPICAL PERFOR A CE CHARACTERISTICS

Shutdown Threshold (Rising)

vs Temperature

1.37

Shutdown Threshold (Falling)

vs Temperature

1.240

1.36

1.235

1.35

1.230

1.34

1.225

VCC vs Temperature

8.1

ICC = 0mA

8.0

ICC = 20mA

7.9

1.33

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3800 G01

VCC vs ICC(LOAD)

8.05

TA = 25°C

8.00

7.95

7.90

7.85

0

5 10 15 20 25 30 35 40

ICC(LOAD) (mA)

3800 G04

1.220

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3800 G02

VCC vs VIN

8

ICC = 20mA

TA = 25°C

7

6

5

4

3

4 5 6 7 8 9 10 11 12

VIN (V)

3800 G05

7.8

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3800 G03

ICC Current Limit vs Temperature

200

175

150

125

100

75

50

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3800 G06

3800fb

4

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