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DS-LIA135 / LIA136-R01 www.ixysic.com 1
LIA135 / LIA136
Low Voltage Optically Isolated
Error Amplifiers
Features
• Low Input Voltage of 1.6V over temperature
• Precision reference, error amplifier, and optocoupler
in a single package
• Voltage Reference: 1.299V ±0.5% @ 25°C
LIA135: ±1% @ -40°C to +85°C
LIA136: ±1.5% @ -40°C to +110°C
• LIA136: Reduced dark current at high temperature
• Common Mode Transient Immunity:
LIA135: 5V/ns
LIA136: 20V/ns
• Simplified frequency compensation
• CTR 500% to 2000%
• Lowest optical offset current (I
CE
vs. V
LED
)
Applications
• Low Voltage Power Supply Feedback
• Isolated Power Supply Feedback
• AC-to DC Power Supplies
• DC-to-DC Converters
Description
The LIA135 and LIA136 are low voltage optically
isolated error amplifiers with a precision
programmable shunt reference combined into a single
package capable of operating down to 1.6V. The
optocoupler portion of the LIA135 / LIA136 comprises
an infrared LED that is optically coupled to an NPN
phototransistor providing a current transfer ratio from
500% to 2000%. Ensuring low voltage performance,
the input voltage range of 1.6V to 10V is guaranteed
over the operational temperature range.
The combination of features in the LIA135 / LIA136
are optimal for use in isolated AC-to-DC power
supplies and DC-to-DC converters. The bias current
for the shunt regulator does not pass through the LED,
which eliminates bias-related optical current, giving
the user the industry’s largest dynamic range (1000:1).
These devices are available in DIP and surface mount
(SMT) packages.
Approvals
• UL Recognized Component: File # E76270
• CSA Certified Component: Certificate # 1305490
Ordering Information
LIA135 and LIA136 Block Diagrams
Part Description
LIA135 8-pin DIP, Tube (50/Tube)
LIA135S 8-pin Surface Mount, Tube (50/Tube)
LIA135STR 8-pin Surface Mount, Tape & Reel (1000/Reel)
LIA136 8-pin DIP, Tube (50/Tube)
LIA136S 8-pin Surface Mount, Tube (50/Tube)
LIA136STR 8-pin Surface Mount, Tape & Reel (1000/Reel)
LIA135
+
_
+
_
GND
COMP
LED
FB
C
E
LIA136
+
_
+
_
GND
COMP
LED
FB
C
E
B