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| 型号： | LTC3853IUJ#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.15 A DUAL SWITCHING CONTROLLER, 830 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, PLASTIC, QFN-40 |
| 文件页数： | 31/36页 |
| 文件大小： | 1780K |
| 代理商： | LTC3853IUJ#TR |
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LTC3853
4
3853fa
ELECTRICAL CHARACTERISTICS
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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3853UJ: TJ = TA + (PD 33°C/W)
Note 3: The LTC3853 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3853E is guaranteed to meet performance specifications
from 0°C to 85°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
LTC3853I is guaranteed over the full –40°C to 125°C operating junction
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 3), VIN = 15V, VRUN1,2,3 = 5V, unless otherwise noted.
temperature range. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Note 4: The LTC3853 is tested in a feedback loop that servos VITH1,2,3 to a
specified voltage and measures the resultant VFB1,2,3.
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 specified for an inductor
peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
7V < VIN < 24V
4.8
5
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 50mA
0.5
2
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
l
4.5
4.7
V
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V
30
75
mV
VLDOHYS
EXTVCC Hysteresis
200
mV
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
VFREQ = 1.2V
450
500
550
kHz
fLOW
Lowest Frequency
VFREQ = 0V
210
250
290
kHz
fHIGH
Highest Frequency
VFREQ ≥ 2.4V
670
750
830
kHz
PhTRIPLE
Channel 2-Channel 1 Phase
Channel 3-Channel 2 Phase
Channel 1-Channel 3 Phase
120
Deg
PhDUAL(2+1)
Channel 2-Channel 1 Phase
Channel 3-Channel 2 Phase
Channel 1-Channel 3 Phase
VFB2 Tied to VIN Through 200kΩ
180
60
120
Deg
RMODE/PLLIN
MODE/PLLIN Input Resistance
250
kΩ
IFREQ
Phase Detector Output Current
Sinking Capability
Sourcing Capability
fMODE < fOSC
fMODE > fOSC
–13
13
A
PGOOD Outputs
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±2
A
VPG
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
VFB Ramping Positive
–5
5
–7.5
7.5
–10
10
%
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