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參數(shù)資料
| 型號： | LT3845EFE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 263K |
| 代理商： | LT3845EFE#TR |
LT3845
3
3845fb
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amp Reference Voltage
Measured at VFB Pin
●
1.224
1.215
1.231
1.238
1.245
V
VFB Pin Input Current
VFB = 1.231V
25
nA
SHDN Enable Threshold (Rising)
SHDN Threshold Hysteresis
●
1.3
1.35
120
1.4
V
mV
Sense Pins Common Mode Range
Current Limit Sense Voltage
Reverse Protect Sense Voltage
Reverse Current Inhibit Offset
VSENSE+ – VSENSE–
VSENSE+ – VSENSE–, VBURST_EN = VCC
VBURST_EN = 0V or VBURST_EN = VFB
●
0
90
100
–100
10
36
115
V
mV
Input Current (ISENSE+ + ISENSE–)VSENSE(CM) = 0V
VSENSE(CM) = 2V
VSENSE(CM) > 4V
800
–20
–300
μA
Operating Frequency
●
290
270
300
310
330
kHz
Minimum Programmable Frequency
Maximum Programmable Frequency
●
500
100
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
2μA
Error Amp Transconductance
●
270
340
410
μS
Error Amp DC Voltage Gain
62
dB
Error Amp Sink/Source Current
±30
μA
TG, BG Drive On Voltage (Note 7)
TG, BG Drive Off Voltage
CLOAD = 3300pF
9.8
0.1
V
TG, BG Drive Rise/Fall Time
10% to 90% or 90% to 10%, CLOAD = 3300pF
50
ns
Minimum TG Off Time
●
350
650
ns
Minimum TG On Time
●
250
400
ns
Gate Drive Nonoverlap Time
TG Fall to BG Rise
BG Fall to TG Rise
200
150
ns
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
temperature range, otherwise specications 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.
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 specied maximum operating junction
temperature may impair device reliability.
Note 3: The LT3845E is guaranteed to meet performance specications
from 0°C to 125°C junction temperature. Specications 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.
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 specication 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.
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