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參數(shù)資料
| 型號： | LTC3890IGN-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封裝： | LEAD FREE, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 31/36頁 |
| 文件大?。?/td> | 498K |
| 代理商： | LTC3890IGN-1#PBF |
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LTC3890-1
4
38901f
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
junction temperature range, otherwise specications are at TJ = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VLDOEXT
INTVCC Load Regulation
ICC = 0mA to 50mA, VEXTVCC = 8.5V
0.6
1.1
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
4.5
4.7
4.9
V
VLDOHYS
EXTVCC Hysteresis
250
mV
Oscillator and Phase-Locked Loop
f25kΩ
Programmable Frequency
RFREQ = 25k, PLLIN/MODE = DC Voltage
105
kHz
f65kΩ
Programmable Frequency
RFREQ = 65k, PLLIN/MODE = DC Voltage
375
440
505
kHz
f105kΩ
Programmable Frequency
RFREQ = 105k, PLLIN/MODE = DC Voltage
835
kHz
fLOW
Low Fixed Frequency
VFREQ = 0V, PLLIN/MODE = DC Voltage
320
350
380
kHz
fHIGH
High Fixed Frequency
VFREQ = INTVCC, PLLIN/MODE = DC Voltage
485
535
585
kHz
fSYNC
Synchronizable Frequency
PLLIN/MODE = External Clock
l
75
850
kHz
PGOOD1 Output
VPGL
PGOOD1 Voltage Low
IPGOOD = 2mA
0.2
0.4
V
IPGOOD
PGOOD1 Leakage Current
VPGOOD = 5V
±1
μA
VPG
PGOOD1 Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
Hysteresis
–13
–10
2.5
–7
%
VFB with Respect to Set Regulated Voltage
VFB Ramping Positive
Hysteresis
710
2.5
13
%
tPG
Delay for Reporting a Fault
25
μs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Ratings for extended periods may affect device reliability and
lifetime.
Note 2: The LTC3890E-1 is guaranteed to meet performance specications
from 0°C to 125°C. Specications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3890I-1 is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD 90°C/W)
Note 4: The LTC3890-1 is tested in a feedback loop that servos VITH1,2 to
a specied voltage and measures the resultant VFB1,2. The specication at
85°C is not tested in production. This specication is assured by design,
characterization and correlation to production testing at 125°C.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specied for an inductor peak-
to-peak ripple current ≥ of IMAX (See Minimum On-Time Considerations in
the Applications Information section).
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