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LT8300IS5#TRPBF

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LT8300
1
8300f
Typical applicaTion
FeaTures DescripTion
100V
IN
Micropower Isolated
Flyback Converter with
150V/260mA Switch
The LT
®
8300 is a micropower high voltage isolated flyback
converter. By sampling the isolated output voltage directly
from the primary-side flyback waveform, the part requires
no third winding or opto-isolator for regulation. The output
voltage is programmed with a single external resistor. In-
ternal compensation and soft-start further reduce external
component count. Boundary mode operation provides a
small magnetic solution with excellent load regulation.
Low ripple Burst Mode operation maintains high efficiency
at light load while minimizing the output voltage ripple.
A 260mA, 150V DMOS power switch is integrated along
with all high voltage circuitry and control logic into a 5-lead
ThinSOT™ package.
The LT8300 operates from an input voltages range of 6V
to 100V and can deliver up to 2W of isolated output power.
The high level of integration and the use of boundary
and low ripple burst modes result in a simple to use, low
component count, and high efficiency application solution
for isolated power delivery.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497,
and 7471522.
5V Micropower Isolated Flyback Converter
applicaTions
n
6V to 100V Input Voltage Range
n
260mA, 150V Internal DMOS Power Switch
n
Low Quiescent Current:
70µA in Sleep Mode
330µA in Active Mode
n
Boundary Mode Operation at Heavy Load
n
Low-Ripple Burst Mode
®
Operation at Light Load
n
Minimum Load <0.5% (Typ) of Full Output
n
V
OUT
Set with a Single External Resistor
n
No Transformer Third Winding or Opto-Isolator
Required for Regulation
n
Accurate EN/UVLO Threshold and Hysteresis
n
Internal Compensation and Soft-Start
n
5-Lead TSOT-23 Package
n
Isolated Telecom, Automotive, Industrial, Medical
Power Supplies
n
Isolated Auxiliary/Housekeeping Power Supplies
Efficiency vs Load Current
LT8300
4:1
R
FB
SW
300µH 19µH
EN/UVLO
1M
2.2µF
40.2k
V
IN
V
IN
36V TO 72V
V
OUT
+
5V
1mA TO 300mA
V
OUT
–
GND
210k
•
•
47µF
8300 TA01a
LOAD CURRENT (mA)
EFFICIENCY (%)
100
20
30
90
40
10
60
70
80
50
0
8300 TA01b
300250200150100500
V
IN
= 48V
V
IN
= 72V
V
IN
= 36V
LT8300
2
8300f
pin conFiguraTionabsoluTe MaxiMuM raTings
SW (Note 2) ........................................................... 150V
V
IN
......................................................................... 100V
EN/UVLO ................................................................... V
IN
R
FB
...................................................... V
IN
– 0.5V to V
IN
Current into R
FB
................................................... 200µA
Operating Junction Temperature Range (Notes 3, 4)
LT8300E, LT8300I ............................. –40°C to 125°C
LT8300H ............................................ –40°C to 150°C
LT8300MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
EN/UVLO 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
R
FB
3
5 V
IN
4 SW
T
JMAX
= 150°C, θ
JA
= 150°C/W
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8300ES5#PBF LT8300ES5#TRPBF LTGFF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT8300IS5#PBF LT8300IS5#TRPBF LTGFF 5-Lead Plastic TSOT-23 –40°C to 125°C
LT8300HS5#PBF LT8300HS5#TRPBF LTGFF 5-Lead Plastic TSOT-23 –40°C to 150°C
LT8300MPS5#PBF LT8300MPS5#TRPBF LTGFF 5-Lead Plastic TSOT-23 –55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
LT8300
3
8300f
elecTrical characTerisTics
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 SW pin is rated to 150V for transients. Depending on the
leakage inductance voltage spike, operating waveforms of the SW pin
should be derated to keep the flyback voltage spike below 150V as shown
in Figure 5.
Note 3: The LT8300E is guaranteed to meet performance specifications
from 0°C to 125°C operating 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 l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, V
EN/UVLO
= V
IN
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
V
IN
Input Voltage Range 6 100 V
V
IN
UVLO Threshold Rising
Falling
5.8
3.2
6 V
V
I
Q
V
IN
Quiescent Current V
EN/UVLO
= 0.3V
V
EN/UVLO
= 1.1V
Sleep Mode (Switch Off)
Active Mode (Switch On)
1.2
200
70
330
2 µA
µA
µA
µA
EN/UVLO Shutdown Threshold For Lowest Off I
Q
l
0.3 0.75 V
EN/UVLO Enable Threshold Falling
Hysteresis
l
1.199 1.223
0.016
1.270 V
V
I
HYS
EN/UVLO Hysteresis Current V
EN/UVLO
= 0.3V
V
EN/UVLO
= 1.1V
V
EN/UVLO
= 1.3V
–0.1
2.2
–0.1
0
2.5
0
0.1
2.8
0.1
µA
µA
µA
f
MAX
Maximum Switching Frequency 720 750 780 kHz
f
MIN
Minimum Switching Frequency 6 7.5 9 kHz
t
ON(MIN)
Minimum Switch-On Time 160 ns
t
OFF(MIN)
Minimum Switch-Off Time 350 ns
t
OFF(MAX)
Maximum Switch-Off Time Backup Timer 200 µs
I
SW(MAX)
Maximum SW Current Limit
l
228 260 292 mA
I
SW(MIN)
Minimum SW Current Limit
l
34 52 70 mA
SW Over Current Limit To Initiate Soft-Start 520 mA
R
DS(ON)
Switch On-Resistance I
SW
= 100mA 10 Ω
I
LKG
Switch Leakage Current V
IN
= 100V, V
SW
= 150V 0.1 0.5 µA
I
RFB
R
FB
Regulation Current
l
98 100 102 µA
R
FB
Regulation Current Line Regulation 6V ≤ V
IN
≤ 100V 0.001 0.01 %/V
t
SS
Soft-Start Timer 2.7 ms
The LT8300I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8300H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT8300MP is guaranteed
over the full –55°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperature greater than 125°C.
Note 4: The LT8300 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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LT8300IS5#TRPBF

Mfr. #:
Buy LT8300IS5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 150V, 300mA Micropower Isolated Flyback Converter
Lifecycle:
New from this manufacturer.
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