LM34926MR/NOPB Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The LM34926MR/NOPB is a 300mA integrated secondary bias regulator for isolated DC/DC converters, accepting 7.5V to 100V input. It operates in current-mode control with adjustable output from 1.225V, packaged in an 8-pin SOIC rated for industrial temperature ranges.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 9
- Lifecycle
- ACTIVE
- Datasheet
- LM34926MR/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.5500(MOQ 285)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM34926MR/NOPB?
- Ultra-wide 7.5V to 100V input range enables direct operation from 48V telecom and industrial bus rails without pre-regulation
- Integrated secondary bias function eliminates an external auxiliary winding and associated diode/capacitor, reducing isolated power supply BOM by 4 to 6 components
- Adjustable output voltage from 1.225V using a resistor divider allows flexible bias rail programming for opto-couplers, gate drivers, or control ICs
What is LM34926MR/NOPB used for?
The LM34926MR/NOPB is designed for generating secondary bias rails in isolated DC/DC converters used in telecom rectifiers, industrial motor drives, and server power supplies operating from 48V or higher bus voltages. Its 100V input capability covers both standard 48V bus and 75V transient conditions found in distributed power architectures. The device simplifies isolated flyback or forward converter designs by integrating the secondary bias function, reducing external component count and PCB area.
What are the specifications of LM34926MR/NOPB?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | ALSO OPERATES IN ADJUSTABLE MODE FROM 1.225V |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT MODE |
| Input Voltage-Max | 100V |
| Input Voltage-Min | 9V |
| Input Voltage-Nom | 48V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.3A |
| Output Voltage-Max | 90V |
| Output Voltage-Min | 1.25V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 1000kHz |
| Technology | BICMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the LM34926MR/NOPB datasheet?
LM34926MR/NOPB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM34926MR/NOPB?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does LM34926MR/NOPB support, and which bus rails is it compatible with?
The LM34926MR/NOPB operates from 7.5V to 100V input, making it directly compatible with 12V, 24V, 48V, and 72V bus rails commonly used in telecom central office equipment and industrial automation. The 100V maximum rating provides safety margin for 48V bus transients up to 80V without requiring an additional protection clamp.
How does integrating the secondary bias function in LM34926MR/NOPB simplify isolated flyback converter design?
By integrating the secondary bias regulator, LM34926MR/NOPB eliminates the need for an auxiliary winding, rectifier diode, and filter capacitor that a discrete secondary bias circuit would require. This removes 4 to 6 components from the BOM, reduces winding complexity in the isolation transformer, and decreases PCB area by approximately 30 mm² in a typical 5W isolated power supply design.
What is the maximum output current of LM34926MR/NOPB, and what loads can it drive?
The LM34926MR/NOPB provides up to 300 mA of output current, sufficient to power opto-coupler feedback networks (typically 5 to 20 mA), PWM controller ICs (20 to 100 mA), and gate driver supplies (up to 200 mA peak) in isolated DC/DC converter secondary sides. The adjustable output down to 1.225V covers both 3.3V and 5V control IC rails in a single device.
When should a designer choose LM34926MR/NOPB over a discrete linear regulator for secondary bias in an isolated supply?
A designer should prefer LM34926MR/NOPB when the input bus voltage exceeds 40V, where a linear LDO regulator would dissipate excessive power (e.g., 30V x 300 mA = 9W). The LM34926MR/NOPB uses current-mode switching control to regulate efficiently across 7.5V to 100V input, keeping power dissipation below 1W even at 100V input with a 5V, 200 mA output load.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
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| 285+ | $2.3200 | $661.20 |
| 500+ | $1.7500 | $875.00 |
| 1000+ | $1.6500 | $1650.00 |
| 10000+ | $1.5500 | $15500.00 |
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