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Texas Instruments LM27341MY/NOPB
- Part No.:
- LM27341MY/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM27341MY/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,565
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Product details
Overview
LM27341MY/NOPB from Texas Instruments is a monolithic, high-frequency, peak current-mode PWM step-down DC-DC regulator in a 10-pin WSON package. It delivers up to 1.5-A output current with 1% internal voltage reference accuracy, 2-MHz switching frequency, and supports input voltages from 3 V to 20 V for local power conversion in space-constrained applications such as USB-powered devices and set-top boxes.
For engineers reviewing the LM27341MY/NOPB datasheet, LM27341MY/NOPB pinout, LM27341MY/NOPB application, or LM27341MY/NOPB equivalent, key selection criteria include its 150-mΩ NMOS switch RDS(ON), 70-nA shutdown current, frequency synchronization capability (1–2.35 MHz), thermal shutdown at 165°C, and internal soft-start timing of 1 ms - all critical for compact, efficient, and reliable buck converter design.
Technical Context
The LM27341MY/NOPB implements constant-frequency, peak current-mode control with internal compensation and a fixed 2-MHz oscillator that is synchronizable via the SYNC pin. Its architecture integrates a 150-mΩ NMOS power switch, bootstrap LDO (3.9 V output), and feedback comparator referenced to a precise 1-V internal bandgap.
It features cycle-by-cycle current limiting (2 A min), frequency foldback during overcurrent (down to 220 kHz), output overvoltage protection (trip at 1.13 V on FB), and undervoltage lockout with 2.75 V threshold and 470 mV hysteresis - enabling robust operation across automotive-grade temperature ranges (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide-range industrial and automotive inputs without external pre-regulation. |
| Max Output Current | 1.5 A - sufficient for powering core logic, FPGAs, and interface ICs in compact systems. |
| Switching Frequency | 2 MHz (internally set), synchronizable 1–2.35 MHz - enables use of sub-2.2-µH inductors and low-ESR ceramic capacitors. |
| RDS(ON) | 150 mΩ (typ) - minimizes conduction loss and thermal rise at full load in 3 mm × 3 mm WSON package. |
| Feedback Reference | 1.0 V ±1% - ensures tight output regulation (e.g., ±12 mV at 1.2 V output) across temperature and line variations. |
| Shutdown Current | 70 nA - preserves battery life in always-on or low-power standby modes. |
| Min On-Time | 65 ns - supports high step-down ratios (e.g., 12 V → 1.2 V at 10% duty cycle) without pulse-skipping instability. |
Pinout & Package
LM27341MY/NOPB is housed in a thermally enhanced 10-pin WSON (DSC) package measuring 3.00 mm × 3.00 mm with an exposed thermal pad (DAP) tied to GND. The package supports high-power density layouts with low junction-to-board thermal resistance (22.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - SW | Power switch output | Connects directly to inductor and catch diode; carries high di/dt switching current - requires short, low-inductance routing. |
| 3 - BOOST | Bootstrap supply node | Drives NMOS gate via external capacitor; must maintain ≥3 V above SW during turn-on for full RDS(ON) performance. |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables regulation; <0.4 V forces shutdown with 70-nA quiescent draw - no pull-up required. |
| 5 - SYNC | External clock input | Accepts 1–2.35 MHz square wave; grounding selects internal 2-MHz oscillator - eliminates beat frequencies in multi-rail systems. |
| 6 - FB | Feedback sensing node | Monitors resistor divider output; regulates VOUT via 1-V reference - layout sensitivity demands direct trace to GND (pin 7). |
| 7 - GND | Signal and power ground | Reference for FB, EN, SYNC; connects to PCB ground plane and DAP - critical for noise immunity and thermal dissipation. |
| 8 - AVIN | Analog supply input | Powers control circuitry (error amp, oscillator, logic); decoupling near pin improves PSRR and startup stability. |
| 9, 10 - PVIN | Power stage input | Supplies NMOS switch; requires local high-frequency bypass (e.g., 10 µF X5R + 100 nF C0G) to minimize voltage droop. |
| DAP | Thermal pad / GND | Exposed copper pad soldered to PCB ground plane - mandatory for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control with internal compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time for stable 2-MHz operation. |
| Integrated 150-mΩ NMOS switch + bootstrap LDO | Enables single-chip 1.5-A buck conversion without external MOSFET or charge pump - simplifies layout and improves efficiency at light loads. |
| Frequency synchronization (1–2.35 MHz) | Allows EMI tuning and multi-converter phase alignment - avoids interference in sensitive RF or audio subsystems. |
| Internal soft-start (1 ms typical) | Controls output ramp rate to limit inrush current into bulk capacitance - prevents input rail collapse and system reset events. |
| Thermal shutdown with 15°C hysteresis | Protects against sustained overload or poor heatsinking - automatically recovers when junction cools to ~150°C, avoiding latch-off failure mode. |
Applications
| Local 12-V to Vcore Step-Down | Radio Power Supply |
|---|---|
Use Scenario: Converting 12-V automotive battery rail to 1.2–1.8 V for RF transceiver baseband processors. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise core voltage with fast transient response to burst-mode TX/RX load changes. Use Value: 2-MHz switching minimizes output ripple and enables small 1.5-µH inductors; 1% VREF ensures stable PLL/VCO bias under varying battery voltage. | Use Scenario: Generating clean 3.3-V supply for FM/AM tuner modules in infotainment head units. IC Role / Device Role / Timing Role: Isolated DC-DC stage rejecting engine cranking noise and alternator ripple before analog RF front-end stages. Use Value: 70-nA shutdown allows full system sleep mode; SYNC pin enables synchronization with main SoC clock to suppress heterodyne artifacts. |
| Core Power in HDDs | USB Powered Devices |
Use Scenario: Providing 5-V or 3.3-V logic supply to HDD controller ASICs from 12-V spindle motor rail. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating across wide input range (7–15 V) during motor spin-up and steady-state. Use Value: Wide 3–20 V input range accommodates unregulated motor rail; thermal shutdown protects during mechanical stall conditions. | Use Scenario: Stepping down 5-V USB bus voltage to 1.8-V or 1.2-V for microcontroller cores in portable diagnostic tools. IC Role / Device Role / Timing Role: Compact, self-contained buck converter eliminating need for external MOSFETs or controllers in space-limited enclosures. Use Value: 3 mm × 3 mm WSON footprint fits within USB-A connector keep-out zone; 65-ns min on-time supports 5 V → 1.2 V conversion at 2 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27342MY/NOPB | 2-A max output current; 2.5-A min current limit; identical pinout and feature set. | Suitable where higher load current or margin is required (e.g., dual-core MCUs), but consumes same board area. | Select LM27342MY/NOPB only if >1.5-A continuous load is confirmed - no change to layout or external components needed. |
| TPS62130ARGTR | 3-A output; 3-MHz switching; different pinout (16-pin QFN); requires external compensation. | Better suited for higher-current, ultra-compact designs where efficiency >90% at 2 A is critical. | Choose TPS62130ARGTR when scaling beyond 1.5 A or requiring higher frequency for smaller magnetics - redesign PCB layout and feedback network. |
Compared with LM27342MY/NOPB, the LM27341MY/NOPB offers lower cost and thermal margin for 1.5-A applications; versus TPS62130ARGTR, it provides drop-in compatibility and simpler design with internal compensation, trading off peak current capability and switching frequency headroom.
Availability
LM27341MY/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM27341MY/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability DC-DC conversion solutions.
The LM2734x product line was designed for space-constrained, high-frequency point-of-load regulation in automotive, industrial, and consumer electronics - emphasizing integration, thermal robustness, and EMI control without external compensation.
FAQ
What is the maximum supported input voltage for LM27341MY/NOPB?
The LM27341MY/NOPB supports a recommended operating input voltage range of 3 V to 20 V. Its absolute maximum rating for AVIN and PVIN is 24 V, but sustained operation above 20 V is not advised due to increased stress on internal NMOS and thermal limits. Always verify derating per ambient temperature using the RθJA = 47.6°C/W value for the WSON package.
Does LM27341MY/NOPB require external compensation components?
No, the LM27341MY/NOPB uses internally compensated peak current-mode control, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and ensures stable 2-MHz operation across input voltage, load, and temperature variations without loop tuning.
How does the SYNC pin function in LM27341MY/NOPB?
The SYNC pin on the LM27341MY/NOPB accepts an external clock signal from 1 MHz to 2.35 MHz to override the internal 2-MHz oscillator. When grounded, it defaults to internal operation. Loss of SYNC causes automatic reversion to internal clock within 1.5 µs - enabling reliable multi-rail synchronization while maintaining fault tolerance.
What thermal considerations apply to LM27341MY/NOPB in the WSON package?
The LM27341MY/NOPB in the 10-pin WSON (DSC) package has a junction-to-board thermal resistance (RθJB) of 22.5°C/W. To maintain safe operation at 1.5-A load, the DAP thermal pad must be soldered to a minimum 200-mm² copper pour on the PCB's inner or bottom layer, with ≥4 thermal vias (0.3-mm diameter) connecting to solid ground planes.
Can LM27341MY/NOPB operate with an output voltage below 1 V?
No - the LM27341MY/NOPB regulates based on a fixed 1.0-V internal feedback reference. Output voltage is set by the resistor divider on the FB pin using VOUT = 1.0 V × (1 + R1/R2). Therefore, the lowest achievable regulated output is 1 V; outputs below this require external reference injection or a different regulator architecture.
LM27341MY/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-PowerPad
LM27341MY/NOPB FAQ
1.How can I place an order for LM27341MY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27341MY/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM27341MY/NOPB reliable?
The price and inventory of LM27341MY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27341MY/NOPB is usually 5 days.
3.What payment methods are accepted for LM27341MY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27341MY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27341MY/NOPB?
LM27341MY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27341MY/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM27341MY/NOPB?
For technical support, including LM27341MY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27341MY/NOPB requirements.
6.How does Aetrix verify that LM27341MY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27341MY/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM27341MY/NOPB meets industry standards.
7.What is the process for return or replacement of LM27341MY/NOPB?
All LM27341MY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27341MY/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM27341MY/NOPB part is unused and in its original packaging.
Return procedure for LM27341MY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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