參數(shù)資料
型號(hào)： LTC3869IGN-2#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO28
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 34/40頁(yè)
文件大?。?/td> 2705K
代理商： LTC3869IGN-2#PBF
LTC3869/LTC3869-2
4
3869f
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 LTC3869 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3869E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3869I is
guaranteed to meet performance specifications over the full –40°C to
125°C operating junction temperature range. The maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the package thermal
impedence and other environmental factors.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3869UFD: TJ = TA + (PD 34°C/W)
LTC3869GN-2: TJ = TA + (PD 80°C/W)
Note 4: The LTC3869 is tested in a feedback loop that servos VITH1,2 to a
specified voltage and measures the resultant VFB1,2.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: 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).
Note 8: Guaranteed by design.
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 20mA
0.5
2
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
l
4.5
4.7
V
VLDOHYS
EXTVCC Hysteresis
200
mV
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V
50
100
mV
PGOOD Output
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 Output Voltage
VFB Ramping Negative
VFB Ramping Positive
–10
10
%
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
700
780
850
kHz
RMODE/PLLIN MODE/PLLIN Input Resistance
250
k
IFREQ
Frequency Setting Current
9
10
11
A
On Chip Driver
TG RUP
TG Pull-Up RDS(ON)
TG High
2.6
Ω
TG RDOWN
TG Pull-Down RDS(ON)
TG Low
1.5
Ω
BG RUP
BG Pull-Up RDS(ON)
BG High
2.4
Ω
BG RDOWN
BG Pull-Down RDS(ON)
BG Low
1.1
Ω
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