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Texas Instruments LM27341SD/NOPB
- Part No.:
- LM27341SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM27341SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:945
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Product details
Overview
LM27341SD/NOPB from Texas Instruments is a monolithic, peak current-mode PWM step-down DC-DC regulator delivering up to 1.5 A output current with 150 mΩ internal NMOS switch, 2 MHz fixed switching frequency, and 1% feedback reference accuracy. It operates across 3 V to 20 V input and supports 1 V to 18 V output, targeting space-constrained local power conversion in automotive infotainment and USB-powered devices.
For engineers reviewing the LM27341SD/NOPB datasheet, LM27341SD/NOPB pinout, LM27341SD/NOPB application, or LM27341SD/NOPB equivalent, key selection criteria include its 70 nA shutdown current, frequency synchronization range (1–2.35 MHz), thermal shutdown at 165°C, 65 ns minimum on-time, and WSON-10 package compatibility with high-density PCB layouts.
Technical Context
The LM27341SD/NOPB implements constant-frequency, peak current-mode control with internal compensation and a dedicated AVIN supply for control circuitry separate from PVIN for the power stage. Its bootstrap architecture generates gate drive voltage (VBOOST – VSW) via an internal LDO and external CBOOST, enabling efficient 150 mΩ NMOS switching.
It features integrated protection including cycle-by-cycle current limiting (2 A min), output overvoltage protection (trip at 1.13 × VFB), undervoltage lockout (2.75 V typ., 470 mV hysteresis), and thermal shutdown with 15°C hysteresis - all operating within –40°C to 125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports direct 12-V rail and wide-input industrial/automotive supplies without pre-regulation. |
| Output Current | 1.5 A max - sufficient for core logic, RF modules, and HDD preamp stages without external pass devices. |
| Switching Frequency | 2 MHz (internal), syncable 1–2.35 MHz - enables use of ≤2.2 µH inductors and chip-scale ceramic capacitors for minimal footprint. |
| Feedback Reference | 1.00 V ±1% - ensures ±1% output regulation accuracy across temperature and line/load conditions. |
| Shutdown Current | 70 nA - preserves battery life in always-on USB or automotive standby systems. |
| Min On-Time | 65 ns - supports high step-down ratios (e.g., 12 V → 1.2 V at 2 MHz) without pulse-skipping instability. |
| Thermal Shutdown | 165°C (typ.), 15°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
LM27341SD/NOPB uses a 3 mm × 3 mm, 10-pin WSON (DSC) package with exposed thermal pad (DAP) soldered to GND for enhanced thermal performance (RθJA = 47.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Power switch output | Connects directly to inductor and catch diode; carries full switched current and requires low-inductance layout. |
| 3 BOOST | Bootstrap capacitor node | Supplies gate drive voltage (VBOOST – VSW) to internal NMOS; requires 0.1 µF ceramic capacitor to SW. |
| 4 EN | Enable control input | Logic-high (>1.8 V) enables regulation; <0.4 V forces 70 nA shutdown; must not float or exceed VIN + 0.3 V. |
| 5 SYNC | Frequency sync input | Accepts external clock (1–2.35 MHz); grounding selects internal 2 MHz oscillator; loss reverts to internal clock in <1.5 µs. |
| 6 FB | Voltage feedback input | Senses resistor divider output; regulates VOUT via 1 V reference; OVP triggers at 1.13 V. |
| 7 GND | Signal and power ground | Reference for FB divider and control circuitry; place bottom resistor adjacent to minimize noise coupling. |
| 8 AVIN | Analog supply input | Powers error amplifier, PWM comparator, and logic; decouple with 0.1 µF ceramic near pin. |
| 9, 10 PVIN | Power stage supply | Provides current to internal NMOS switch; requires low-ESR bulk capacitor (≥10 µF) tied close to pins 9/10 and DAP. |
| DAP | Thermal pad / GND | Exposed copper pad for heat dissipation and low-impedance GND connection; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 150 mΩ NMOS switch | Enables 1.5-A output without external MOSFETs, reducing BOM count and layout complexity. |
| Peak current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation. |
| Frequency foldback | Reduces switching frequency to 220 kHz during short-circuit, limiting power dissipation and thermal stress. |
| Internal soft-start (1 ms) | Controls output ramp rate to limit inrush current into bulk capacitance, preventing input rail collapse. |
| Separate AVIN and PVIN supplies | Isolates noise-sensitive analog circuitry from high-current power path, improving regulation stability. |
Applications
| Automotive Infotainment | USB-Powered Devices |
|---|---|
Use Scenario: Powering DSP, display controller, and audio codec in head unit with 12-V battery input. IC Role / Device Role / Timing Role: Primary buck regulator converting 12 V to 3.3 V/1.8 V for digital subsystems. Use Value: 2-MHz operation avoids AM band interference; 70-nA shutdown extends battery runtime during vehicle sleep mode. | Use Scenario: Regulating 5-V USB input to 3.3-V logic supply in portable diagnostic tools or OTG accessories. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter eliminating need for external FET and controller. Use Value: WSON-10 footprint fits tight USB-C form factors; 3–20-V input handles USB PD negotiation and legacy 5-V sources. |
| HDD Core Power | Set-Top Box SoC Supply |
Use Scenario: Generating 1.2-V core voltage for HDD controller ASIC from 12-V spindle supply. IC Role / Device Role / Timing Role: High-efficiency, high-frequency point-of-load regulator with fast load transient response. Use Value: 65-ns minimum on-time supports 12 V → 1.2 V conversion at 2 MHz; internal current limit protects during spin-up surges. | Use Scenario: Delivering stable 1.1-V or 1.35-V supply to broadcast SoC under varying thermal loads. IC Role / Device Role / Timing Role: Synchronized buck regulator sharing clock with video processing ICs to suppress beat frequencies. Use Value: SYNC pin allows EMI alignment across multiple rails; thermal shutdown prevents damage during enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27342SD/NOPB | 2-A output capability, 2.5-A current limit, identical pinout and package | Required where >1.5-A continuous load exists (e.g., multi-core SoCs) | Select LM27342SD/NOPB when higher output current is needed; same layout, no redesign required. |
| TPS62130ARGTR | 3-V to 17-V input, 3-A output, 2.5-MHz sync range, different pinout (16-pin QFN) | Used in higher-current, lower-noise applications requiring adjustable soft-start or power-good signal | Choose TPS62130ARGTR only if 3-A output or PG signal is mandatory; requires PCB layout change. |
Compared with LM27342SD/NOPB, the LM27341SD/NOPB offers lower cost and thermal margin for 1.5-A designs; versus TPS62130ARGTR, it provides smaller footprint and simpler biasing but lacks power-good and adjustable soft-start.
Availability
LM27341SD/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, USB-powered peripherals, and HDD controller power delivery requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned manufacturing rigor.
Supply support for LM27341SD/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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and consumer markets.
The LM2734x product line delivers compact, high-frequency buck regulators optimized for space-constrained point-of-load applications in automotive, computing, and communications equipment.
FAQ
What is the maximum output current supported by the LM27341SD/NOPB?
The LM27341SD/NOPB delivers up to 1.5 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper thermal layout). Its internal 150-mΩ NMOS switch and cycle-by-cycle current limit (2 A minimum) ensure reliable operation at this rating. Exceeding 1.5 A may trigger thermal shutdown or reduce efficiency due to increased conduction losses.
Does the LM27341SD/NOPB require external compensation components?
No, the LM27341SD/NOPB uses internal compensation and does not require external RC networks. Its peak current-mode architecture with built-in slope compensation eliminates the need for loop compensation components, simplifying design and reducing bill-of-materials count while maintaining stability across 3 V to 20 V input and 1 V to 18 V output ranges.
How does the SYNC pin function on the LM27341SD/NOPB?
The SYNC pin on the LM27341SD/NOPB accepts an external clock signal between 1 MHz and 2.35 MHz to synchronize switching frequency. When driven, it overrides the internal 2-MHz oscillator; if the signal is lost, the LM27341SD/NOPB reverts to internal operation within 1.5 µs. Grounding SYNC selects the default 2-MHz mode. This feature reduces EMI beat frequencies in multi-rail systems.
What thermal considerations apply to the LM27341SD/NOPB in a 3 mm × 3 mm WSON package?
The LM27341SD/NOPB in WSON-10 (DSC) package has RθJA = 47.6°C/W on a 3" × 3" 4-layer PCB. To maintain TJ ≤ 125°C at full load, ensure the exposed DAP thermal pad is fully soldered to a solid GND plane. Avoid thermal isolation; use ≥4 thermal vias under DAP connected to inner ground layers to achieve acceptable junction temperatures in enclosed or high-ambient environments.
Can the LM27341SD/NOPB operate with input voltages below 5 V?
Yes, the LM27341SD/NOPB supports input down to 3 V. However, at VIN < 5 V and duty cycles >75%, the internal bootstrap circuit may not sustain sufficient gate drive. In such cases, an external Schottky diode must connect a 5-V rail to the BOOST pin to ensure reliable NMOS switching - per TI's Figure 28 application note - while keeping VBOOST – VSW < 6 V.
LM27341SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN 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-SON (3x3)
LM27341SD/NOPB FAQ
1.How can I place an order for LM27341SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27341SD/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 LM27341SD/NOPB reliable?
The price and inventory of LM27341SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27341SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM27341SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27341SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27341SD/NOPB?
LM27341SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27341SD/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 LM27341SD/NOPB?
For technical support, including LM27341SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27341SD/NOPB requirements.
6.How does Aetrix verify that LM27341SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27341SD/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 LM27341SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM27341SD/NOPB?
All LM27341SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27341SD/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 LM27341SD/NOPB part is unused and in its original packaging.
Return procedure for LM27341SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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