參數資料
型號: LTC3851AIMSE#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, PDSO16
封裝: LEAD FREE, PLASTIC, MSOP-16
文件頁數: 25/30頁
文件大?。?/td> 430K
代理商: LTC3851AIMSE#PBF
LTC3851A
4
3851afa
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 38V
4.8
5
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 50mA
0.5
2
%
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
RFREQ = 60k
460
500
540
kHz
fLOW
Lowest Frequency
RFREQ = 160k
205
235
265
kHz
fHIGH
Highest Frequency
RFREQ = 36k
690
750
810
kHz
RMODE/PLLIN MODE/PLLIN Input Resistance
100
fMODE
MODE/PLLIN Minimum Input Frequency
MODE/PLLIN Maximum Input Frequency
VMODE = External Clock
250
750
kHz
IFREQ
Phase Detector Output Current
Sinking Capability
Sourcing Capability
fMODE > fOSC
fMODE < fOSC
–90
75
A
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 LTC3851A is tested under pulsed load conditions such that
TA ≈ TJ. The LTC3851AE is guaranteed to meet performance specications
from 0°C to 85°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
LTC3851AI is guaranteed to meet specifications over the –40°C to 125°C
operating junction temperature range, the LTC3851AH is guaranteed
over the –40°C to 150°C operating junction temperature range and the
LTC3851AMP is tested and guaranteed over the –55°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
than 125°C. Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3851AGN: TJ = TA + (PD 110°C/W)
LTC3851AUD: TJ = TA + (PD 68°C/W)
LTC3851AMSE: TJ = TA + (PD 40°C/W)
Note 4: The LTC3851A 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. Rise and fall times are assured by
design, characterization and correlation with statistical process controls.
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).
Note 8: Guaranteed by design; not tested in production.
Typical perForMance characTerisTics
Efficiency vs Output Current
and Mode
Efficiency vs Output Current
and Mode
Efficiency vs Output Current
and Mode
LOAD CURRENT (mA)
10
40
EFFICIENCY(%)
50
60
70
80
100
1000
10000
100000
3851A 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
3851A 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
3851A G03
30
20
10
0
90
100
VIN = 12V
VOUT = 5V
BURST
CCM
PULSE
SKIP
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