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Texas Instruments LM27342MYX/NOPB
- Part No.:
- LM27342MYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM27342MYX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,418
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Product details
Overview
LM27342MYX/NOPB from Texas Instruments is a 2-MHz, 2-A synchronous step-down DC-DC regulator in a 3 mm × 3 mm 10-pin WSON package, featuring internal 150-mΩ NMOS switch, 1% feedback reference accuracy, and frequency synchronization (1–2.35 MHz). It delivers stable 1–18 V output from 3–20 V input and is used in automotive infotainment power rails, USB-powered device core supplies, and set-top box local conversion.
For engineers reviewing the LM27342MYX/NOPB datasheet, LM27342MYX/NOPB pinout, LM27342MYX/NOPB application, or LM27342MYX/NOPB equivalent, key selection criteria include its 2-A current capability, 65-ns minimum on-time enabling high-frequency operation with small passives, thermal shutdown at 165°C, and peak current-mode control with internal compensation for fast transient response in space-constrained designs.
Technical Context
The LM27342MYX/NOPB implements peak current-mode PWM control with internal compensation and a fixed 2-MHz oscillator that supports external synchronization between 1 MHz and 2.35 MHz via the SYNC pin. Its bootstrap architecture generates gate drive voltage (VBOOST – VSW ≈ 3.9 V) using an internal LDO and external CBOOST, enabling efficient switching of the integrated 150-mΩ NMOS FET.
It features cycle-by-cycle current limiting (2.5 A min), frequency foldback during overcurrent (down to 220 kHz), output overvoltage protection (1.13 × VFB), and undervoltage lockout with 470 mV hysteresis (2.75 V enable threshold). Soft-start is fixed at 1 ms, and shutdown quiescent current is 70 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A maximum - supports higher-power loads than LM27341 (1.5 A), enabling single-regulator solutions for demanding embedded applications. |
| Switching Frequency | 2 MHz nominal, synchronizable 1–2.35 MHz - allows use of sub-2.2 µH inductors and compact ceramic capacitors, reducing PCB area. |
| Feedback Reference | 1.00 V ±1% - enables precise output regulation across temperature (–40°C to 125°C) without external trimming. |
| Minimum On-Time | 65 ns - supports high step-down ratios (e.g., 12 V → 1.2 V at 2 MHz) while maintaining PWM control stability. |
| Current Limit | 2.5 A minimum - provides robust short-circuit protection with pulse-by-pulse limiting, independent of input voltage. |
| Shutdown Current | 70 nA typical - minimizes system standby power loss, critical for battery-backed or always-on USB devices. |
| Thermal Shutdown | 165°C with 15°C hysteresis - protects against sustained overload or poor layout; resumes operation only after junction cools to ~150°C. |
Pinout & Package
LM27342MYX/NOPB uses the DSC (WSON) 10-pin package: 3.00 mm × 3.00 mm body, exposed thermal pad (DAP) on bottom, leadless construction. The DAP must be soldered to a dedicated GND copper pour for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node output | Connects directly to inductor and catch diode; carries high di/dt switching current - requires tight loop layout and Kelvin grounding. |
| 3 BOOST | Bootstrap supply | Drives NMOS gate; requires 0.1 µF ceramic capacitor to SW - improper sizing causes gate underdrive and efficiency loss. |
| 4 EN | Enable control input | Logic-high (>1.8 V) enables regulation; <0.4 V forces 70-nA shutdown - must not float or exceed PVIN + 0.3 V. |
| 5 SYNC | Frequency sync input | Accepts external clock (1–2.35 MHz); grounded for internal 2-MHz operation - loss of signal reverts to internal oscillator within 1.5 µs. |
| 6 FB | Feedback input | Senses resistor divider output; regulates VOUT = 1.00 V × (1 + R1/R2) - place bottom resistor adjacent to GND pin for accuracy. |
| 7 GND | Signal ground | Reference for FB, EN, SYNC; tie feedback resistor ground here - separate from power ground paths to avoid noise coupling. |
| 8 AVIN | Analog supply | Powers control circuitry (error amp, oscillator, logic); bypass with 1 µF ceramic close to pin - decouples noise from PVIN. |
| 9, 10 PVIN | Power input | Supplies NMOS switch; requires low-ESR bulk capacitor (e.g., 10 µF X5R) near pins 9/10 - minimizes input ripple and EMI. |
| DAP | Thermal pad / GND | Exposed bottom pad; must be soldered to large GND plane - accounts for >70% of thermal conduction; improves RθJA by ~25°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-mΩ NMOS switch | Enables 2-A continuous output without external MOSFETs, reducing BOM count and layout complexity in compact converters. |
| Internal compensation network | Eliminates need for external compensation components - simplifies design, accelerates prototyping, and ensures stability across operating conditions. |
| 65-ns minimum on-time | Supports high-frequency, high-ratio buck conversion (e.g., 12 V → 1.2 V at 2 MHz) without forced discontinuous mode or burst operation. |
| Frequency foldback (220–2350 kHz) | Prevents thermal runaway during output short by reducing switching frequency as FB falls - maintains regulation while limiting average power. |
| 1% VFB accuracy over temperature | Ensures ±1.8% output tolerance (for 1.8-V output) across –40°C to 125°C - critical for processor core and memory supply compliance. |
Applications
| Automotive Infotainment Power | USB-Powered Device Core Supply |
|---|---|
|
Use Scenario: Local 12-V battery rail conversion to 3.3-V or 1.8-V supply for DSP, display controller, and audio codec in car head units. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with fast load transient response to handle burst processing demands. Use Value: 2-A capability supports multi-core SoCs; 2-MHz operation avoids AM band interference; AEC-Q100 Grade 1 qualification ensures reliability in automotive environments. |
Use Scenario: Step-down from 5-V USB bus to 1.2-V or 1.8-V core voltage for portable media players, Bluetooth headsets, or USB-C peripherals. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC-DC converter enabling extended battery life and compact form factor. Use Value: 70-nA shutdown current preserves battery charge during idle; 3×3 mm WSON package fits tight USB device layouts; internal soft-start prevents inrush-triggered host port reset. |
| Set-Top Box Local Regulation | HDD Core Power Supply |
|
Use Scenario: Generating 1.2-V, 1.5-V, or 1.8-V CPU/memory rails from 12-V or 5-V intermediate bus in digital cable/satellite receivers. IC Role / Device Role / Timing Role: Point-of-load regulator providing dynamically adjustable output voltage via resistor divider, supporting multiple SoC configurations. Use Value: Wide 1–18-V output range accommodates various SoC requirements; frequency synchronization eliminates beat frequencies when multiple LM27342s operate on same board. |
Use Scenario: Providing stable 1.2-V or 1.5-V core voltage to HDD controller ASICs and servo processors in consumer NAS and DVR systems. IC Role / Device Role / Timing Role: High-transient-response buck converter handling rapid current steps during spin-up and seek operations. Use Value: Peak current-mode control delivers <10-µs response to 1-A load steps; thermal shutdown protects against enclosure overheating; 150-mΩ RDS(on) minimizes conduction loss at 2-A peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27341MYX/NOPB | 1.5-A output current, identical pinout and package; otherwise identical specs including 2-MHz sync, 1% VFB, and WSON-10 footprint. | Lower current rating limits use in >1.5-A loads; suitable where thermal margin or cost reduction is prioritized over headroom. | Select LM27341MYX/NOPB only if 1.5-A peak load is confirmed; LM27342MYX/NOPB offers direct upgrade path with no layout change. |
| TPS62130ARGTR | 3-A output, 2.5-MHz fixed frequency, different pinout (16-pin QFN), no SYNC input, 0.8-V reference, higher IQ (17 µA active). | Higher current and smaller solution size but lacks frequency synchronization and shares no pin compatibility. | Choose TPS62130ARGTR for higher-current or ultra-compact designs where sync is unnecessary; LM27342MYX/NOPB remains preferred for EMI-sensitive or multi-regulator synchronized systems. |
Compared with LM27341MYX/NOPB, LM27342MYX/NOPB delivers 33% more output current in the same footprint and thermal profile, while TPS62130ARGTR trades sync capability and pin compatibility for higher current and slightly higher operating frequency - making LM27342MYX/NOPB optimal for automotive and USB applications requiring synchronization and proven thermal behavior.
Availability
LM27342MYX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-powered portable electronics, and set-top box power management requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM27342MYX/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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability DC-DC conversion and automotive-grade design.
The LM2734x family was developed to deliver high-density, high-frequency step-down regulation for space-constrained applications such as automotive infotainment, portable electronics, and consumer set-top boxes - emphasizing thermal efficiency, EMI control, and simplified design.
FAQ
What is the maximum output current supported by the LM27342MYX/NOPB?
The LM27342MYX/NOPB supports a continuous output current of up to 2 A under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal layout). Its current limit is specified at 2.5 A minimum across temperature, ensuring reliable overload protection. This distinguishes it from the LM27341MYX/NOPB (1.5-A version) while sharing the same WSON-10 package and pinout.
Does the LM27342MYX/NOPB require external compensation components?
No, the LM27342MYX/NOPB features fully internal compensation, eliminating the need for external RC networks. This simplifies design, reduces bill-of-materials count, and guarantees stability across its full operating range (3–20 V input, 1–18 V output, –40°C to 125°C). Layout best practices still apply - especially for SW, BOOST, and PVIN nodes - but no compensation tuning is required.
Can the LM27342MYX/NOPB be synchronized to an external clock, and what is the supported frequency range?
Yes, the LM27342MYX/NOPB supports frequency synchronization via its SYNC pin over a range of 1 MHz to 2.35 MHz. When an external clock is applied, the device locks to that frequency within one cycle; if the signal is lost, it reverts to its internal 2-MHz oscillator within 1.5 µs. Grounding SYNC disables synchronization and enables the default 2-MHz operation.
What is the purpose of the DAP (exposed thermal pad) on the LM27342MYX/NOPB WSON package?
The DAP on the LM27342MYX/NOPB serves as both a thermal dissipation path and a signal/power ground connection. It must be soldered to a dedicated GND copper pour on the PCB to achieve specified thermal resistance (RθJA = 47.6°C/W). Omitting or undersizing this pad degrades thermal performance and may trigger premature thermal shutdown under 2-A load conditions.
How does the LM27342MYX/NOPB handle short-circuit conditions?
Under short-circuit, the LM27342MYX/NOPB activates frequency foldback: switching frequency decreases smoothly from 2 MHz down to ~220 kHz as FB voltage drops below regulation. This reduces average power dissipation and prevents thermal runaway. Simultaneously, cycle-by-cycle current limiting (2.5 A min) and thermal shutdown (165°C) provide layered protection. Synchronization is disabled during foldback and resumes once FB exceeds 0.53 V.
LM27342MYX/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:
- 2A
- 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
LM27342MYX/NOPB FAQ
1.How can I place an order for LM27342MYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342MYX/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 LM27342MYX/NOPB reliable?
The price and inventory of LM27342MYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342MYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342MYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342MYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342MYX/NOPB?
LM27342MYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342MYX/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 LM27342MYX/NOPB?
For technical support, including LM27342MYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342MYX/NOPB requirements.
6.How does Aetrix verify that LM27342MYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342MYX/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 LM27342MYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342MYX/NOPB?
All LM27342MYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342MYX/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 LM27342MYX/NOPB part is unused and in its original packaging.
Return procedure for LM27342MYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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