Linear Technology Analog Devices LT8301 Datasheet

FEATURES
AEC-Q100 Qualified for Automotive Applications
n
2.7V to 42V Input Voltage Range
n
1.2A, 65V Internal DMOS Power Switch
n
Low Quiescent Current:
n
100µA in Sleep Mode
350µA in Active Mode
Boundary Mode Operation at Heavy Load
n
Low-Ripple Burst Mode
n
Minimum Load <0.5% (Typ) of Full Output
n
V Set with a Single External Resistor
n OUT
No Transformer Third Winding or Opto-Isolator
n
Required for Regulation
Accurate EN/UVLO Threshold and Hysteresis
n
Internal Compensation and Soft-Start
n
Output Short-Circuit Protection
n
5-Lead TSOT-23 Package
n
APPLICATIONS
Isolated Telecom, Automotive, Industrial, Medical
n
Power Supplies
Isolated Auxiliary/Housekeeping Power Supplies
n
TYPICAL APPLICATION
2.7V to 36V /5V
IN
V
IN
2.7V TO 36V
10µF
EN/UVLO
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Operation at Light Load
®
Micropower Isolated Flyback Converter
OUT
3:1
•
40µH 4.4µH
V
IN
•
SW
LT8301
154k
R
FB
GND
For more information
42V Micropower No-Opto
IN
Isolated Flyback Converter
with 65V/1.2A Switch
DESCRIPTION
The LT 8301 is a micropower 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. Internal
compensation and soft-start further reduce external com-
ponent 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
1.2A, 65V DMOS power switch is integrated along with
all high voltage circuitry and control logic into a 5-lead
ThinSOT™ package.
The LT8301 operates from an input voltage range of 2.7V
to 42V and can deliver up to 6W 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.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5438499, 7463497, and 7471522.
+
V
OUT
5V
6mA TO 0.40A (V = 5V)
IN
6mA TO 0.70A (V = 12V)
IN
100µF
6mA TO 1.00A (V = 24V)
IN
6mA TO 1.15A (V = 36V)
IN
–
V
OUT
8301 TA01a
www.analog.com
LT8301
Efficiency vs Load Current
90
85
80
75
70
V
V
65
V
V
60
0 0.2 0.4 0.6 0.8
LOAD CURRENT (A)
= 5V
IN
= 12V
IN
= 24V
IN
= 36V
IN
1.0 1.2
8301 TA01b
Rev. A
1