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Texas Instruments LM27342QMY/NOPB
- Part No.:
- LM27342QMY/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM27342QMY/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
LM27342QMY/NOPB from Texas Instruments is a 2-MHz, 2-A synchronous step-down DC-DC regulator in a 10-pin WSON (3 mm × 3 mm) package, featuring peak current-mode PWM control, internal 150-mΩ NMOS switch, 1% feedback reference accuracy, and frequency synchronization support from 1 MHz to 2.35 MHz. It delivers stable local power conversion for automotive infotainment and USB-powered devices.
For engineers reviewing the LM27342QMY/NOPB datasheet, LM27342QMY/NOPB pinout, LM27342QMY/NOPB application, or LM27342QMY/NOPB equivalent, key selection considerations include its 3 V–20 V input range, 1 V–18 V output adjustability via FB resistor divider, 65 ns minimum on-time, thermal shutdown at 165°C, and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM27342QMY/NOPB implements a constant-frequency, peak current-mode PWM architecture with internal compensation and fixed 2-MHz nominal switching frequency-synchronizable externally between 1 MHz and 2.35 MHz. Its control loop uses an error amplifier comparing FB voltage against a 1-V internal reference, combined with a corrective ramp and current-sense signal for cycle-by-cycle regulation.
It integrates a bootstrap LDO (3.9 V output) to drive the internal NMOS gate, supports soft-start (1 ms typical), pulse-by-pulse current limiting (2.5 A min), overvoltage protection (1.13 V FB threshold), and undervoltage lockout (2.75 V rising, 2.28 V falling) with hysteresis. Thermal shutdown activates at 165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide-range industrial and automotive supply rails without pre-regulation. |
| Output Current | 2 A maximum - enables single-chip core/regulator solutions for mid-power applications like HDDs or set-top boxes. |
| Switching Frequency | 2 MHz nominal, synchronizable 1–2.35 MHz - allows use of sub-2.2 µH inductors and compact ceramic capacitors. |
| Feedback Reference | 1.00 V ±1% - ensures precise output voltage setting across temperature (–40°C to +125°C). |
| Minimum On-Time | 65 ns - supports high step-down ratios (e.g., 12 V → 1.2 V at 10% duty cycle) without pulse-skipping instability. |
| Shutdown Current | 70 nA - minimizes battery drain in always-on automotive modules during sleep mode. |
| Thermal Shutdown | 165°C activation - protects device under overload or poor PCB thermal layout; recovers at ~150°C. |
Pinout & Package
LM27342QMY/NOPB is housed in a thermally enhanced 10-pin WSON package (3.00 mm × 3.00 mm, 0.75 mm height) with exposed DAP (Die Attach Pad) for improved heat dissipation and low-inductance ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node output | Connects directly to inductor, catch diode cathode, and bootstrap capacitor; carries high di/dt switching current. |
| 3 BOOST | Bootstrap supply | Provides gate drive voltage (VBOOST – VSW) for internal NMOS; requires external 0.1 µF ceramic capacitor to SW. |
| 4 EN | Enable control input | Logic-high (>1.8 V) enables operation; logic-low (<0.4 V) enters ultra-low-IQ shutdown (70 nA). |
| 5 SYNC | Frequency sync input | Accepts external clock (1–2.35 MHz); grounding selects internal 2-MHz oscillator. |
| 6 FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT = 1 V × (1 + R1/R2). |
| 7 GND | Signal and power ground | Reference for FB, EN, SYNC; place bottom FB resistor adjacent to minimize noise coupling. |
| 8 AVIN | Analog supply input | Powers internal control circuitry (error amp, oscillator, logic); bypass with 0.1 µF to GND. |
| 9, 10 PVIN | Power stage supply | Supplies internal NMOS switch; requires low-ESR bulk capacitor close to pins 9/10 and GND. |
| DAP | Thermal & ground pad | Exposed copper pad tied to GND; mandatory for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing. |
| Internal 150-mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and PCB area while supporting 2-A continuous load. |
| Frequency synchronization | Prevents beat frequencies in multi-rail systems and enables EMI optimization by aligning switching edges to system clocks. |
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (–40°C to +125°C junction), including HTOL, TC, and ESD testing per automotive standards. |
| Integrated soft-start (1 ms) | Controls output ramp rate to limit inrush current into output capacitors, preventing input rail sag or reset glitches. |
Applications
| Automotive Infotainment | USB-Powered Devices |
|---|---|
Use Scenario: Powering DSP, display controller, and audio codec in head-unit systems with 12-V battery input. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3 V or 5 V from unregulated vehicle battery, synchronized to system clock to suppress AM-band interference. Use Value: AEC-Q100 Grade 1 rating ensures reliability across automotive temperature extremes; 2-MHz operation minimizes inductor size for space-constrained dash layouts. | Use Scenario: Regulating 5 V USB input down to 1.8 V or 3.3 V for portable SSDs, dongles, or Bluetooth adapters. IC Role / Device Role / Timing Role: Local point-of-load converter providing clean, low-noise core voltage with fast load-step response to burst data transfers. Use Value: 65 ns minimum on-time supports high step-down ratios from 5 V input; 70-nA shutdown extends battery life during idle states. |
| HDD Core Power | Set-Top Box SoC Supply |
Use Scenario: Generating 1.2 V core voltage for 2.5-inch HDD controllers with tight transient requirements. IC Role / Device Role / Timing Role: High-efficiency synchronous buck supplying up to 2 A with <90% efficiency at full load, regulated via FB divider. Use Value: Internal compensation eliminates external compensation network; thermal shutdown prevents damage during enclosure overheating. | Use Scenario: Providing stable 1.1 V or 1.25 V supply to broadcast SoCs in cable/satellite receivers with variable thermal loading. IC Role / Device Role / Timing Role: Main SoC power rail regulator operating from 12-V wall adapter, synchronized to video processing clock to reduce ripple coupling. Use Value: 1% FB reference accuracy maintains SoC stability across line/load/temperature; WSON package enables dense, low-profile PCB designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27342QDGQRQ1 | Same electrical specs; MSOP-PowerPAD (4.9 mm × 3.0 mm) package with exposed thermal pad. | Better thermal performance in high-ambient or high-power-density layouts due to larger pad area and lower RθJA (49.5°C/W vs 47.6°C/W). | Select when board layout allows larger footprint and thermal management prioritizes junction temperature over size. |
| TPS54202HDDCR | 2-A, 2.5-MHz buck with integrated FETs; 4.5–18-V input; 0.6-V reference; no SYNC pin; 1.5-A continuous rating derated above 85°C. | Lacks frequency synchronization and AEC-Q100 qualification; optimized for cost-sensitive consumer electronics, not automotive. | Choose only for non-automotive, non-synchronized applications where smaller solution size and lower BOM cost outweigh sync and qualification needs. |
Compared with LM27342QMY/NOPB, LM27342QDGQRQ1 offers identical regulation performance in a thermally superior but larger package, while TPS54202HDDCR provides higher switching frequency and lower reference voltage at the expense of automotive qualification and sync capability-making LM27342QMY/NOPB optimal for space-constrained, synchronized, AEC-Q100-compliant designs.
Availability
LM27342QMY/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, USB-powered peripherals, HDD core power, and set-top box SoC supply requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.
Supply support for LM27342QMY/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 automotive, industrial, and personal electronics markets.
The LM2734x product line delivers high-frequency, high-current synchronous buck regulators targeting space-constrained, thermally demanding applications such as automotive subsystems and portable electronics where small inductors and fast transient response are critical.
FAQ
What is the maximum output current supported by the LM27342QMY/NOPB?
The LM27342QMY/NOPB supports a continuous output current of up to 2 A under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its current limit is specified at 2.5 A minimum across temperature, enabling robust overload handling. Actual achievable current depends on input-output voltage differential, ambient temperature, and PCB copper area dedicated to the DAP thermal pad.
Does the LM27342QMY/NOPB require external compensation components?
No, the LM27342QMY/NOPB features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and improves consistency across production units. Stability is ensured across the full 1 V–18 V output range with standard output capacitor ESR values.
How does the frequency synchronization feature work on the LM27342QMY/NOPB?
The LM27342QMY/NOPB accepts an external clock signal (1–2.35 MHz) on the SYNC pin to override its internal 2-MHz oscillator. At the first rising edge, it locks to the external frequency and maintains phase alignment. If the SYNC signal is lost, it reverts to internal operation within 1.5 µs. Grounding SYNC disables synchronization and forces 2-MHz operation.
What is the purpose of the DAP (exposed pad) on the LM27342QMY/NOPB WSON package?
The DAP on the LM27342QMY/NOPB serves as both a low-thermal-resistance path to PCB ground and a low-inductance return for high-frequency switching currents. It must be soldered to a solid GND plane using ≥4 thermal vias to achieve the specified RθJB (22.5°C/W) and prevent thermal shutdown under load. Leaving it unconnected degrades thermal performance and may cause premature shutdown.
Is the LM27342QMY/NOPB qualified for automotive applications?
Yes, the LM27342QMY/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), manufactured on an automotive-grade flow, and tested for HTOL, temperature cycling, and ESD per JESD22 standards. The "Q" in the part number explicitly denotes automotive qualification, making it suitable for infotainment, ADAS, and body electronics where reliability under harsh conditions is required.
LM27342QMY/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-PowerPad
LM27342QMY/NOPB FAQ
1.How can I place an order for LM27342QMY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342QMY/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 LM27342QMY/NOPB reliable?
The price and inventory of LM27342QMY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342QMY/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342QMY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342QMY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342QMY/NOPB?
LM27342QMY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342QMY/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 LM27342QMY/NOPB?
For technical support, including LM27342QMY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342QMY/NOPB requirements.
6.How does Aetrix verify that LM27342QMY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342QMY/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 LM27342QMY/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342QMY/NOPB?
All LM27342QMY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342QMY/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 LM27342QMY/NOPB part is unused and in its original packaging.
Return procedure for LM27342QMY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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