參數(shù)資料
型號(hào)： LTC3787IGN#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28
文件頁數(shù)： 31/36頁
文件大?。?/td> 363K
代理商： LTC3787IGN#PBF
LTC3787
4
3787fb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTVCC Linear Regulator
VINTVCC(VIN)
Internal VCC Voltage
6V < VBIAS < 38V, VEXTVCC = 0
5.2
5.4
5.6
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 50mA
0.5
2
%
VINTVCC(EXT)
Internal VCC Voltage
VEXTVCC = 6V
5.2
5.4
5.6
V
VLDO EXT
INTVCC Load Regulation
ICC = 0mA to 40mA, VEXTVCC = 6V
0.5
2
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
l
4.5
4.8
5
V
VLDOHYS
EXTVCC Hysteresis
250
mV
Oscillator and Phase-Locked Loop
fPROG
Programmable Frequency
RFREQ = 25k
RFREQ = 60k
RFREQ = 100k
335
105
400
760
465
kHz
fLOW
Lowest Fixed Frequency
VFREQ = 0V
320
350
380
kHz
fHIGH
Highest Fixed Frequency
VFREQ = INTVCC
488
535
585
kHz
fSYNC
Synchronizable Frequency
PLLIN/MODE = External Clock
l
75
850
kHz
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.2
0.4
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
μA
VPGOOD
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
Hysteresis
–12
–10
2.5
–8
%
VFB Ramping Positive
Hysteresis
810
2.5
12
%
tPGOOD(DELAY)
PGOOD Delay
PGOOD Going High to Low
25
μs
BOOST1 and BOOST2 Charge Pump
IBOOST1,2
BOOST Charge Pump Available Output
Current
VSW1,2 = 12V; VBOOST1,2 – VSW1,2 = 4.5V;
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
55
μA
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
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 LTC3787 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3787E is guaranteed to meet 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
LTC3787I is guaranteed over the –40°C to 125°C operating junction
temperature range. 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. The junction temperature (TJ,
in °C) is calculated from the ambient temperature (TA, in °C) and power
dissipation (PD, in Watts) according to the formula: TJ = TA + (PD θJA),
where
θJA = 43°C/W for the QFN package and θJA = 90°C/W for the SSOP
package.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: The LTC3787 is tested in a feedback loop that servos VFB to the
output of the error amplifier while maintaining ITH at the midpoint of the
current limit range.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: see Minimum On-Time Considerations in the Applications
Information section.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3787MPGN#TRPBF 功能描述:IC REG CTRLR BST PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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