LT3845EFE 查看數據表（PDF） - Linear Technology

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LT3845EFE

High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

Linear Technology 

LT3845

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

temperature range,

SENSE– = SENSE+ =

otherwise specifications are at TA

10V, SGND = PGND = SW = SYNC

=

=

25°C. VIN = 20V, VCC

0V, unless otherwise

= BOOST

noted.

=

BURST_EN

=

10V,

SHDN

=

2V,

RSET

=

49.9kΩ,

PARAMETER

TG, BG Drive On Voltage (Note 7)

TG, BG Drive Off Voltage

TG, BG Drive Rise/Fall Time

Minimum TG Off Time

Minimum TG On Time

Gate Drive Nonoverlap Time

CONDITIONS

CLOAD = 3300pF

CLOAD = 3300pF

10% to 90% or 90% to 10%, CLOAD = 3300pF

TG Fall to BG Rise

BG Fall to TG Rise

MIN TYP MAX UNITS

9.8

V

0.1

V

50

ns

●

350

650

ns

●

250

400

ns

200

ns

150

ns

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 LT3845 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 LT3845E 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

LT3845I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3845MP is 100% tested and guaranteed over

the –55°C to 125°C temperature range.

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

supported when the VCC is externally driven above 6.5V.

Note 5: Operating range is dictated by MOSFET absolute maximum VGS.

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.

Note 8: The –2V absolute maximum on the SW pin is a transient condition.

It is guaranteed by design and not subject to test.

3845fd

4

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