Reflow Peak Body Temperature ............................ 260°C
pin conFiguraTion
TOP VIEW
V
FB1
RUN1
RLIM
PGOOD1
SW1
1
2
3
4
5
11
10 V
FB2
9 RUN2
8 PGOOD2
7 SW2
6 V
IN
TOP VIEW
V
FB1
RUN1
RLIM
PGOOD1
SW1
1
2
3
4
5
10
9
8
7
6
V
FB2
RUN2
PGOOD2
SW2
V
IN
11
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC3619EDD#PBF
LTC3619IDD#PBF
LTC3619EMSE#PBF
LTC3619IMSE#PBF
TAPE AND REEL
LTC3619EDD#TRPBF
LTC3619IDD#TRPBF
LTC3619EMSE#TRPBF
LTC3619IMSE#TRPBF
PART MARKING*
LFKM
LFKM
LTFKN
LTFKN
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 5V, unless otherwise noted. (Note 3)
SYMBOL
V
IN
V
UV
PARAMETER
V
IN
Operating Voltage Range
V
IN
Undervoltage Lockout
V
IN
Low to High
CONDITIONS
l
l
elecTrical characTerisTics
MIN
2.5
TYP
2.1
MAX
5.5
2.5
UNITS
V
V
3619fa
2
LTC3619
elecTrical characTerisTics
SYMBOL
I
FB
V
FBREG
ΔV
LINEREG
ΔV
LOADREG
I
S
PARAMETER
Feedback Pin Input Current
Feedback Voltage (Channels 1, 2)
V
FB
Line Regulation
V
FB
Load Regulation (Channel 1)
V
FB
Load Regulation (Channel 2)
Supply Current
Active Mode (Note 4)
Sleep Mode
Shutdown
Oscillator Frequency
Peak Switch Current Limit
Channel 1 (400mA)
Channel 2 (800mA)
Input Average Current Limit
LTC3619E, –40°C ≤ T
J
≤ 85°C
LTC3619I, –40°C ≤ T
J
≤ 125°C
V
IN
= 2.5V to 5.5V (Note 7)
I
LOAD
= 0mA to 400mA (Note 7)
I
LOAD
= 0mA to 800mA (Note 7)
V
FB1
= V
FB2
= 0.95
×
V
FBREG
V
FB
= 1.05
×
V
FBREG
, V
IN
= 5.5V
V
RUN1
= V
RUN2
= 0V, V
IN
= 5.5V
V
FB
= 0.6V
V
IN
= 5V, V
FB
< V
FBREG
, Duty Cycle <35%
RLIM = 116k
RLIM = 116k, LTC3619E
RLIM = 116k, LTC3619I
V
IN
= 5V, I
SW
= 100mA
V
IN
= 5V, I
SW
= 100mA
V
IN
= 5V, I
SW
= 100mA
V
IN
= 5V, I
SW
= 100mA
V
IN
= 5V, V
RUN
= 0V
V
FB
from 0.06V to 0.54V
l
l
l
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 5V, unless otherwise noted. (Note 3)
CONDITIONS
l
l
l
MIN
0.588
0.582
TYP
0.600
0.600
0.01
0.5
0.5
600
50
MAX
±30
0.612
0.618
0.25
UNITS
nA
V
V
%/V
%
%
875
100
1
2.7
µA
µA
µA
MHz
mA
mA
f
OSC
I
LIM(PEAK)
I
INLIM (PEAK)
R
DS(ON)
1.8
550
1200
2.25
800
1600
475
475
475
0.45
0.35
0.27
0.25
0.01
l
l
450
437
427
500
513
523
mA
mA
mA
Ω
Ω
Ω
Ω
Channel 1 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
Switch Leakage Current
Soft-Start Time
RUN Threshold High
RUN Leakage Current
Power Good Threshold
I
SW(LKG)
t
SOFTSTART
V
RUN
I
RUN
PGOOD
1
1.3
1.2
1
µA
ms
V
µA
%
%
0.3
0.4
0.95
1
0.01
Entering Window
V
FB
Ramping Up
V
FB
Ramping Down
Leaving Window
V
FB
Ramping Up
V
FB
Ramping Down
PGOOD Rising and Falling, V
IN
= 5V
–5
5
–7
7
9
–9
90
11
–11
30
±1
%
%
µs
Ω
µA
PGOOD Blanking
R
PGOOD
I
PGOOD
Power Good Blanking Time
Power Good Pull-Down On-Resistance
PGOOD Leakage Current
8
V
PGOOD
= 5V
15
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:
Guaranteed by long term current density limitations.
Note 3:
The LTC3619 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3619E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3619I is guaranteed
to meet specified performance over the full –40°C to 125°C operating
junction temperature range.
Note 4:
Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5:
The switch on-resistance is guaranteed by correlation to wafer
level measurements.
Note 6:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7:
The converter is tested in a proprietary test mode that connects
the output of the error amplifier to the SW pin, which is connected to an
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
ADI 工业技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
