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LT3844EFE-TRPBF Datasheet(PDF) 3 Page - Linear Technology

Part # LT3844EFE-TRPBF
Description  High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3844EFE-TRPBF Datasheet(HTML) 3 Page - Linear Technology

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LT3844
3
3844fa
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 LT3844 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 LT3844E 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 LT3844I is guaranteed
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, RSET = 49.9kΩ,
SENSE= SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.
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 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 –1V absolute maximum on the SW pin is a transient
condition. It is guaranteed by design and not subject to test.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCC Operating Voltage Range (Note 5)
20
V
VCC Output Voltage
Over Full Line and Load Range
8
8.3
V
VCC UVLO Threshold (Rising)
6.25
V
VCC UVLO Threshold Hysteresis
500
mV
VCC Supply Current (Note 6)
1.7
2.1
mA
VCC Burst Mode Current
VBURST_EN = 0V
95
μA
VCC Shutdown Current
VSHDN = 0V
20
μA
VCC Current Limit
–40
–120
mA
Error Amp Reference Voltage
Measured at VFB Pin
1.224
1.231
1.238
V
1.215
1.245
V
VFB Pin Input Current
VFB = 1.231V
25
nA
SHDN Enable Threshold (Rising)
1.3
1.35
1.4
V
SHDN Threshold Hysteresis
120
mV
Sense Pins Common Mode Range
036
V
Current Limit Sense Voltage
VSENSE+ – VSENSE–
90
100
115
mV
Input Current
VSENSE(CM) = 0V
350
μA
(ISENSE+ + ISENSE–)VSENSE(CM) = 2V
–25
μA
VSENSE(CM) > 4V
–170
μA
Operating Frequency
290
300
310
kHz
270
330
kHz
Minimum Programmable Frequency
100
kHz
Maximum Programmable Frequency
500
kHz
External Sync Frequency Range
100
600
kHz
SYNC Input Resistance
40
k
Ω
SYNC Voltage Threshold
1.4
2
V
Soft-Start Capacitor Control Current
2
μA
Error Amp Transconductance
270
340
410
μS
Error Amp DC Voltage Gain
62
dB
Error Amp Sink/Source Current
±30
μA
TG Drive On Voltage (Note 7)
CLOAD = 2200pF
9.8
V
TG Drive Off Voltage
CLOAD = 2200pF
0.1
V
TG Drive Rise/Fall Time
10% to 90% or 90% to 10%, CLOAD = 2200pF
40
ns
Minimum TG Off Time
350
500
ns
Minimum TG On Time
250
350
ns


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