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LM3481MMX/NOPB
Texas Instruments
IC REG CTRLR MULT TOP 10MSOP
45329 Pcs New Original In Stock
Boost, Flyback, SEPIC Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 10-VSSOP
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Minimum 1
5.0 / 5.0
- (467 Ratings)
LM3481MMX/NOPB
Product Overview
1263117
DiGi Electronics Part Number
LM3481MMX/NOPB-DGManufacturer
Texas Instruments
LM3481MMX/NOPB
Description
IC REG CTRLR MULT TOP 10MSOPInventory
45329 Pcs New Original In Stock
Boost, Flyback, SEPIC Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 10-VSSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
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LM3481MMX/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Up, Step-Up/Step-Down
Output Configuration
Positive
Topology
Boost, Flyback, SEPIC
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
2.97V ~ 48V
Frequency - Switching
100kHz ~ 1MHz
Duty Cycle (Max)
85%
Synchronous Rectifier
No
Clock Sync
Yes
Serial Interfaces
-
Control Features
Enable, Frequency Control, Ramp, Soft Start
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package
10-VSSOP
Base Product Number
LM3481
Datasheet & Documents
Manufacturer Product Page
LM3481MMX/NOPB Specifications
HTML Datasheet
LM3481MMX/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-38720-2
296-38720-1
2156-LM3481MMX/NOPB
LM3481MMX-DG
TEXTISLM3481MMX/NOPB
LM3481MMX
LM3481MMX/NOPB-DG
296-38720-6
Standard Package
3,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
I always receive my orders quickly from DiGi Electronics, which I value highly.
de desembre 02, 2025
Their delivery system is precise, ensuring my orders arrive without issues.
de desembre 02, 2025
They demonstrate excellent supply chain management, maintaining speedy and reliable shipping.
de desembre 02, 2025
Customer service kept me updated about my order status, which was very reassuring.
de desembre 02, 2025
The login and account management features are straightforward and secure.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LM3481MMX/NOPB in a high-voltage boost application above 30V output, and how can they be mitigated?
When designing with the LM3481MMX/NOPB for high-voltage boost applications exceeding 30V, primary risks include excessive voltage stress on the external MOSFET and diode, increased switching losses, and potential instability due to parasitic inductance. To mitigate these, select a MOSFET with a voltage rating at least 1.5× the maximum expected output voltage and ensure low gate charge for efficient switching. Use a fast-recovery or Schottky diode rated for the full output voltage and current. Minimize loop area in the high-current path to reduce EMI and ringing, and consider adding an RC snubber across the diode if voltage overshoot is observed during transient testing.
Can the LM3481MMX/NOPB be safely replaced with the LT3757 or MAX17710 in a SEPIC topology without redesigning the feedback network?
No, direct replacement of the LM3481MMX/NOPB with the LT3757 or MAX17710 in a SEPIC configuration is not recommended without re-evaluating the feedback and compensation networks. While all three support SEPIC topologies, the LM3481MMX/NOPB has a different error amplifier gain-bandwidth product and internal ramp compensation scheme compared to the LT3757’s current-mode control and the MAX17710’s hysteretic architecture. This mismatch can lead to poor transient response or instability. Always re-tune the compensation components (typically the feedback resistor divider and compensation capacitor) based on the new controller’s control loop characteristics and validate stability via Bode plot or transient load testing.
How does the absence of synchronous rectification in the LM3481MMX/NOPB impact efficiency in low-input-voltage, high-current applications, and what design choices can offset this limitation?
The LM3481MMX/NOPB lacks synchronous rectification, which limits efficiency in low-input-voltage, high-current scenarios (e.g., 3.3V to 12V boost) due to conduction losses in the external diode. To offset this, use a low-forward-voltage Schottky diode with minimal reverse recovery time and consider adding an external synchronous rectifier MOSFET driven by a dedicated controller or discrete logic if efficiency targets exceed 90%. Alternatively, evaluate whether a fully integrated synchronous boost converter like the TPS61088 might better meet thermal and efficiency requirements, though this increases BOM complexity and cost.
What layout considerations are critical when placing the LM3481MMX/NOPB on a 2-layer PCB to avoid noise coupling and ensure reliable operation up to 1MHz switching frequency?
For reliable operation of the LM3481MMX/NOPB on a 2-layer PCB at 1MHz, prioritize a compact power stage layout with minimal high-di/dt loop area—especially between the input capacitor, MOSFET, inductor, and output diode. Place the input bypass capacitor (10µF ceramic) as close as possible to the VCC and GND pins. Use a solid ground plane on the bottom layer and connect all ground references with short vias. Keep the feedback trace away from the inductor and switching node to prevent noise injection. Avoid routing sensitive analog traces (e.g., COMP, FB) parallel to high-frequency switching paths. These practices reduce EMI and prevent false triggering or regulation errors.
Under what conditions might the LM3481MMX/NOPB exhibit subharmonic oscillation in current-mode control, and how can this be prevented in a flyback design with wide input voltage range?
The LM3481MMX/NOPB may exhibit subharmonic oscillation in current-mode flyback designs when operating at duty cycles above 50%, particularly with wide input voltage ranges that push the converter into deep continuous conduction mode (CCM). This occurs due to insufficient slope compensation. To prevent it, ensure the internal ramp compensation (provided via the RAMP pin) is properly configured—typically by selecting a resistor from RAMP to ground per the datasheet’s recommended range. For duty cycles approaching 85%, verify stability across the full input range using a dynamic load test; if oscillation persists, reduce the maximum duty cycle via input voltage headroom or increase the ramp compensation signal by lowering the RAMP resistor value.
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LM3481MMX/NOPB CAD Models
Texas Instruments LM3481MMX/NOPB PCB symbols & footprints
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