參數(shù)資料
型號： LTCEMSE-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO16
封裝： 0.150 INCH, LEAD FREE, PLASTIC, MSOP-16
文件頁數(shù)： 23/28頁
文件大?。?/td> 337K
代理商： LTCEMSE-1#PBF
LTC3851-1
4
38511f
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
junction temperature range, otherwise specications are at TA = 25°C. VIN = 15V, VRUN = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
RFREQ = 60k
480
500
530
kHz
fLOW
Lowest Frequency
RFREQ = 160k
220
250
280
kHz
fHIGH
Highest Frequency
RFREQ = 36k
710
750
790
kHz
RMODE/PLLIN
MODE/PLLIN Input Resistance
100
k
Ω
IFREQ
Phase Detector Output Current
Sinking Capability
Sourcing Capability
fMODE > fOSC
fMODE < fOSC
–10
10
μA
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
μA
VPG
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
VFB Ramping Positive
–12
8
–10
10
–8
12
%
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 LTC3851E-1 is guaranteed to meet performance specications
from 0°C to 85°C. Specications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3851I-1 is guaranteed
over the –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 formulas:
LTC3851MSE-1: TJ = TA + (PD 90°C/W)
LTC3851UD-1: TJ = TA + (PD 68°C/W)
Note 4: The LTC3851-1 is tested in a feedback loop that servos VITH to a
specied voltage and measures the resultant VFB.
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 ~40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
TYPICAL PERFORMANCE CHARACTERISTICS
Efciency vs Output Current and
Mode
Efciency vs Output Current
and Mode
Efciency vs Output Current and
Mode
LOAD CURRENT (mA)
10
40
EFFICIENCY(%)
50
60
70
80
100
1000
10000
100000
38511 G01
30
20
10
0
90
100
VIN = 12V
VOUT = 1.5V
BURST
CCM
PULSE
SKIP
LOAD CURRENT (mA)
10
40
EFFICIENCY(%)
50
60
70
80
100
1000
10000
100000
38511 G02
30
20
10
0
90
100
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
BURST
CCM
PULSE
SKIP
LOAD CURRENT (mA)
10
40
EFFICIENCY
(%)
50
60
70
80
100
1000
10000
100000
38511 G03
30
20
10
0
90
100
VIN = 12V
VOUT = 5V
BURST
CCM
PULSE
SKIP
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