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Texas Instruments LM27342QMYX/NOPB
- Part No.:
- LM27342QMYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM27342QMYX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
LM27342QMYX/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 peak current-mode PWM control, internal 150-mΩ NMOS switch, 1% feedback reference accuracy, and frequency synchronization (1–2.35 MHz). It delivers regulated power for compact, high-density point-of-load applications such as automotive infotainment core supplies and USB-powered devices.
For engineers reviewing the LM27342QMYX/NOPB datasheet, LM27342QMYX/NOPB pinout, LM27342QMYX/NOPB application, or LM27342QMYX/NOPB equivalent, key selection criteria include its 3 V to 20 V input range, 1 V to 18 V output adjustability, 65 ns minimum on-time, thermal shutdown at 165°C, and ultra-low 70 nA shutdown current - all critical for space-constrained, thermally sensitive designs.
Technical Context
The LM27342QMYX/NOPB implements a constant-frequency, peak current-mode PWM architecture with internal compensation and fixed 2 MHz switching (synchronizable 1–2.35 MHz). Its control loop uses an error amplifier comparing FB voltage against a 1.0 V ±1% internal reference, with cycle-by-cycle current limiting triggered at ≥2.5 A (min) and frequency foldback activated when FB falls below 0.53 V.
It integrates dual supply rails: AVIN powers control circuitry (3–20 V), while PVIN feeds the power stage (3–20 V); BOOST generates gate drive via internal LDO and external bootstrap capacitor; SW drives the inductor; and SYNC enables deterministic phase alignment across multiple converters without requiring external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide-range industrial and automotive inputs without pre-regulation. |
| Output Current | 2 A maximum - enables single-chip regulation for mid-power SoC cores or FPGA I/O rails. |
| Switching Frequency | 2 MHz (internal), synchronizable 1–2.35 MHz - allows use of sub-2.2 µH inductors and <100 µF ceramic output caps. |
| Feedback Reference | 1.0 V ±1% over –40°C to +125°C - ensures stable output regulation across automotive temperature extremes. |
| Shutdown Current | 70 nA typical - minimizes battery drain in always-on systems like telematics or sensor hubs. |
| 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. |
| Thermal Shutdown | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Current Limit | 2.5 A minimum (–40°C to +125°C) - provides robust short-circuit protection with guaranteed trip threshold. |
Pinout & Package
LM27342QMYX/NOPB is housed in a thermally enhanced 3 mm × 3 mm, 10-pin WSON (DSC) package with exposed thermal pad (DAP) soldered to PCB ground for 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 full switched current and requires tight layout to minimize EMI and voltage spikes. |
| 3 - BOOST | Bootstrap supply node | Drives NMOS gate via external capacitor; must be routed with low-inductance path to SW to sustain gate voltage during high-side conduction. |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables operation; logic-low (<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 - enables EMI reduction and multi-rail coherence. |
| 6 - FB | Feedback sensing input | Monitors resistor divider output; regulates VOUT by maintaining 1.0 V at this pin - place bottom resistor adjacent to GND for accuracy. |
| 7 - GND | Signal and power ground | Primary reference for control circuitry; connects to PCB ground plane and forms return path for FB network and AVIN. |
| 8 - AVIN | Analog supply input | Powers internal error amp, oscillator, and logic; decouple with 0.1 µF ceramic close to pin to suppress noise coupling into control loop. |
| 9, 10 - PVIN | Power stage supply input | Feeds NMOS source and internal LDO; requires bulk capacitance (e.g., 10 µF X5R) near pins 9/10 to handle high di/dt transients. |
| DAP | Thermal pad / ground | Exposed copper pad tied to GND; mandatory for thermal performance - must be soldered to ≥2 cm² inner-layer ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistors. |
| Internal 150-mΩ NMOS switch | Reduces BOM count and board area vs. external MOSFET solutions; supports >90% efficiency at 1 A load with 12 V → 3.3 V conversion. |
| 1% feedback reference accuracy | Ensures ±1% output voltage tolerance over full temperature and line range - critical for processor core rail compliance. |
| Frequency synchronization | Eliminates beat frequencies in multi-converter systems and shifts switching noise out of sensitive bands (e.g., AM radio 530–1710 kHz). |
| Internal soft-start (1 ms) | Prevents inrush current damage to input capacitors and downstream circuitry during power-up sequences. |
| Output overvoltage protection | Halts switching if FB exceeds 1.13 V (13% above reference), protecting connected ICs from destructive overvoltage events. |
Applications
| Automotive Infotainment Core Supply | USB-Powered Industrial Sensor Hub |
|---|---|
Use Scenario: Powers ARM-based application processor (e.g., NXP i.MX6) in vehicle head unit with 12 V battery input and 1.1 V core requirement. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated 1.1 V @ 1.8 A with fast load transient response to CPU burst activity. Use Value: 2-MHz switching enables <1.5 µH inductor and 47 µF total output capacitance, reducing solution size by 40% vs. 500-kHz alternatives. |
Use Scenario: Converts 5 V USB power to 3.3 V for mixed-signal sensor interface (ADC, MCU, RF transceiver) in portable test equipment. IC Role / Device Role / Timing Role: Single-chip buck converter providing low-noise, low-quiescent power with shutdown control for battery conservation. Use Value: 70 nA shutdown current extends battery life beyond 6 months in sleep mode; SYNC pin allows noise coordination with USB host controller. |
| HDD Preamp Power Supply | Set-Top Box Memory Rail |
Use Scenario: Generates 2.5 V for hard disk drive read/write channel ICs from 12 V intermediate bus in consumer storage enclosures. IC Role / Device Role / Timing Role: High-efficiency local regulator with thermal shutdown to survive ambient temperatures up to 70°C inside enclosed chassis. Use Value: 150-mΩ RDS(ON) and internal compensation deliver >88% efficiency at 1.5 A, minimizing heat generation near sensitive analog circuits. |
Use Scenario: Supplies DDR3 memory termination voltage (VTT = 0.75 V) and auxiliary 1.8 V rail in cable/satellite set-top box using shared 12 V input. IC Role / Device Role / Timing Role: Dual-output capable via resistor-divider feedback; supports precise tracking between VDDQ and VTT with minimal external parts. Use Value: 65 ns minimum on-time enables stable 12 V → 0.75 V conversion at 2 MHz, avoiding low-frequency ripple that degrades signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27342QMY/NOPB | Same silicon, but MSOP-PowerPAD (DGQ) package (4.9 mm × 3.0 mm) with higher RθJA (49.5°C/W vs. 47.6°C/W). | Less suitable for ultra-dense layouts; requires larger PCB footprint and more thermal vias for equivalent power dissipation. | Select LM27342QMYX/NOPB for space-constrained automotive modules; choose LM27342QMY/NOPB only if MSOP assembly infrastructure is already established. |
| TPS54202HDDCR | 2-A, 4.5–17 V input, 2.5-MHz sync-capable buck with integrated FETs; 0.8 V reference, 25 µA quiescent current in eco-mode. | Better light-load efficiency via D-CAP3 control, but lacks frequency foldback and has lower UVLO (4.3 V min). | Choose TPS54202HDDCR for battery-powered applications needing ultra-low IQ; retain LM27342QMYX/NOPB for wide-input (3 V start), automotive temp range, and robust fault protection. |
Compared with LM27342QMY/NOPB, the LM27342QMYX/NOPB offers superior thermal performance and smaller footprint, while TPS54202HDDCR trades off automotive-grade reliability and wide VIN for better light-load IQ - making LM27342QMYX/NOPB optimal for thermally demanding, wide-input industrial and automotive point-of-load designs.
Availability
LM27342QMYX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-powered industrial sensors, and HDD preamp supplies requiring stable component supply, AEC-Q100 Grade 1 compliance, and long-term production continuity.
Supply support for LM27342QMYX/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2734x family was designed specifically for compact, high-frequency DC-DC conversion in automotive, industrial, and consumer electronics where board space, thermal performance, and input voltage flexibility are critical constraints.
FAQ
What is the maximum output current capability of the LM27342QMYX/NOPB?
The LM27342QMYX/NOPB delivers up to 2 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its current limit is specified at ≥2.5 A minimum across –40°C to +125°C, ensuring robust short-circuit protection. Actual achievable output current depends on input voltage, output voltage, ambient temperature, and PCB copper area - for example, at 12 VIN → 3.3 VOUT, full 2 A is sustainable with ≥4 cm² 2-oz copper on inner layers.
Does the LM27342QMYX/NOPB require external compensation components?
No, the LM27342QMYX/NOPB features internal compensation optimized for stability with standard output capacitor ESR ranges and common inductor values (1.0–2.2 µH). This eliminates the need for external RC networks, simplifying design and reducing BOM count. However, layout best practices - including short, low-inductance paths for PVIN, SW, and BOOST - remain essential to maintain loop stability and avoid oscillation.
How does the SYNC pin function on the LM27342QMYX/NOPB?
The SYNC pin on the LM27342QMYX/NOPB accepts an external clock signal (1–2.35 MHz) to synchronize switching frequency and phase across multiple converters. When driven, it overrides the internal 2-MHz oscillator within one cycle; if the SYNC signal is lost, the device reverts to internal operation within 1.5 µs. Grounding SYNC selects the default 2-MHz mode. This capability enables EMI reduction, elimination of beat frequencies, and deterministic timing in multi-rail systems.
What is the purpose of the BOOST pin on the LM27342QMYX/NOPB?
The BOOST pin on the LM27342QMYX/NOPB supplies gate drive voltage to the internal NMOS high-side switch via an external bootstrap capacitor connected between BOOST and SW. During SW low-time, the internal LDO charges the capacitor; during SW high-time, the capacitor provides VGS > 5 V to fully enhance the 150-mΩ switch. Proper BOOST capacitor selection (typically 0.1 µF X7R) and low-inductance routing are critical to prevent shoot-through and ensure reliable operation across input voltage and load ranges.
Is the LM27342QMYX/NOPB qualified for automotive applications?
Yes, the LM27342QMYX/NOPB is the automotive-grade variant (Q suffix) of the LM27342, qualified to AEC-Q100 Grade 1 (–40°C to +125°C ambient) and manufactured on an automotive flow. It includes enhanced testing for reliability, extended temperature validation, and strict process controls - making it suitable for infotainment, body control, and ADAS subsystems where functional safety and long-term stability are required.
LM27342QMYX/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
LM27342QMYX/NOPB FAQ
1.How can I place an order for LM27342QMYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342QMYX/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 LM27342QMYX/NOPB reliable?
The price and inventory of LM27342QMYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342QMYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342QMYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342QMYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342QMYX/NOPB?
LM27342QMYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342QMYX/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 LM27342QMYX/NOPB?
For technical support, including LM27342QMYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342QMYX/NOPB requirements.
6.How does Aetrix verify that LM27342QMYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342QMYX/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 LM27342QMYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342QMYX/NOPB?
All LM27342QMYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342QMYX/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 LM27342QMYX/NOPB part is unused and in its original packaging.
Return procedure for LM27342QMYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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