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參數(shù)資料
| 型號： | LTC3851AIUD-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 25/30頁 |
| 文件大?。?/td> | 0K |
| 代理商： | LTC3851AIUD-1#TRPBF |
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LTC3851A-1
4
3851a1fa
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating
junction 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
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
kΩ
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
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
A
VPG
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative (UV)
VFB Ramping Positive (OV)
–12.5
7.5
–10
10
–7.5
12.5
%
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-1 is tested under pulsed load conditions such that
TA ≈ TJ. The LTC3851AE-1 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 LTC3851AI-1 is guaranteed to meet specifications over the –40°C
to 125°C operating junction temperature range, the LTC3851AH-1 is
guaranteed over the –40°C to 150°C operating junction temperature range
and the LTC3851AMP-1 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:
LTC3851AMSE-1: TJ = TA D 40°C/W)
LTC3851AUD-1: TJ = TA + (PD 68°C/W)
Note 4: The LTC3851A-1 is tested in a feedback loop that servos VITH to a
specified 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 specified 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.
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