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| 型号： | LTC3858EUH-2#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件页数： | 34/40页 |
| 文件大小： | 432K |
| 代理商： | LTC3858EUH-2#TRPBF |
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LTC3858-2
4
38582f
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTVCC Linear Regulator
VINTVCCVIN
Internal VCC Voltage
6V < VIN < 38V, VEXTVCC = 0V
4.85
5.1
5.35
V
VLDOVIN
INTVCC Load Regulation
ICC = 0mA to 50mA, VEXTVCC = 0V
0.7
1.1
%
VINTVCCEXT
Internal VCC Voltage
6V < VEXTVCC < 13V
4.85
5.1
5.35
V
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 Voltage
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 and PGOOD2 Outputs
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.2
0.4
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
μA
VPG
PGOOD 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 (PGOOD
Low)
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 LTC3858-2 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3858E-2 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3858I-2 is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note that the maximum ambient temperature is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD 34°C/W)
Note 4: The LTC3858-2 is tested in a feedback loop that servos VITH1,2 to
a specified voltage and measures the resultant VFB1,2. The specification at
85°C is not tested in production. This specification 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 the Applications information
section.
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 specified for an inductor
peak-to-peak ripple current ≥ of 40% IMAX (See Minimum On-Time
Considerations in the Applications Information section).
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