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Texas Instruments LM27342SDX/NOPB
- Part No.:
- LM27342SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM27342SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,572
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Product details
Overview
LM27342SDX/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, and frequency synchronization (1–2.35 MHz). It delivers regulated output from 1 V to 18 V across 3 V–20 V input, with 1% feedback reference accuracy and 70-nA shutdown current - used in automotive infotainment power rails and USB-powered device core supplies.
For engineers reviewing the LM27342SDX/NOPB datasheet, LM27342SDX/NOPB pinout, LM27342SDX/NOPB application, or LM27342SDX/NOPB equivalent, key selection criteria include verified 2-A continuous output capability, validated thermal performance in WSON (RθJA = 47.6°C/W), confirmed 65-ns minimum on-time for high-frequency operation, and documented SYNC pin behavior under loss-of-signal conditions.
Technical Context
The LM27342SDX/NOPB implements fixed-frequency peak current-mode control with internal compensation and a 2-MHz nominal oscillator synchronized via the SYNC pin (1–2.35 MHz range). Its architecture integrates a bootstrap LDO (3.9 V output) to drive the internal NMOS gate, enabling high-side switching with adaptive gate voltage generation.
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 (2.6–2.9 V threshold). Thermal shutdown activates at 165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A continuous - supports compact 12-V-to-3.3-V/1.8-V point-of-load conversion without external current sense. |
| Switching Frequency | 2 MHz nominal, synchronizable 1–2.35 MHz - enables use of ≤2.2-µH inductors and chip-scale ceramic capacitors. |
| Input Voltage Range | 3 V to 20 V - accommodates 5-V, 12-V, and automotive battery-supplied systems with transient tolerance. |
| Feedback Reference | 1.00 V ±1% - ensures ±10-mV output regulation error across temperature and line variations. |
| Shutdown Current | 70 nA typical - preserves battery life in always-on USB or automotive standby modes. |
| 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 Resistance | RθJA = 47.6°C/W (WSON) - requires minimal copper area for 2-A operation at 125°C ambient. |
Pinout & Package
LM27342SDX/NOPB uses a 10-pin WSON package (3.00 mm × 3.00 mm, 0.5-mm pitch) with exposed thermal pad (DAP) tied to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Power switch node | Connects to inductor, catch diode cathode, and bootstrap capacitor - carries full AC switch current and must be routed with low-inductance layout. |
| 3 BOOST | Bootstrap supply | Drives NMOS gate; requires 0.1-µF ceramic capacitor between BOOST and SW to sustain gate voltage during high-side conduction. |
| 4 EN | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters 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 of signal reverts to internal clock within 1.5 µs. |
| 6 FB | Voltage feedback | Senses output via resistor divider; regulates VOUT = 1.00 V × (1 + R1/R2) - layout requires direct trace to GND (pin 7) for accuracy. |
| 7 GND | Signal & power ground | Reference for FB, EN, SYNC; connects to PCB ground plane and DAP - forms return path for control circuitry. |
| 8 AVIN | Analog supply | Powers internal error amplifier, oscillator, and logic - bypass with 0.1-µF capacitor near pin for noise immunity. |
| 9, 10 PVIN | Power stage input | Supplies NMOS switch; requires local 10-µF ceramic bypass capacitor - separate from AVIN to isolate power-switch noise. |
| DAP | Thermal & ground pad | Exposed bottom pad; must be soldered to solid GND copper pour for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and PCB area while maintaining ≥90% efficiency at 2 A. |
| Internal soft-start (1 ms) | Prevents inrush current and output overshoot during power-up - no external capacitor required. |
| Frequency foldback (220–250 kHz) | Protects against thermal runaway during short-circuit by lowering switching frequency and reducing average power dissipation. |
| Output overvoltage protection (1.13×VFB) | Disables NMOS switch if FB exceeds 1.13 V, preventing damage to downstream 1.8-V or 3.3-V ICs. |
| Peak current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation components. |
Applications
| Automotive Infotainment Power | USB-C Powered Devices |
|---|---|
Use Scenario: Supplies 3.3 V and 1.8 V rails to SoC, display controller, and audio codec in head units with 9–16 V battery input. IC Role / Device Role / Timing Role: Primary buck regulator delivering 2-A continuous current with thermal robustness up to 125°C junction temperature. Use Value: Meets AEC-Q100 Grade 1 requirements (via LM27342-Q1 variant), supports 2-MHz switching to avoid AM band interference, and maintains regulation during cold-crank transients down to 3 V. | Use Scenario: Generates 5 V or 3.3 V from USB-C PD source (5–20 V) for portable test equipment or embedded sensors. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down converter enabling single-layer PCB designs with minimal passive count. Use Value: 70-nA shutdown current extends battery runtime in sleep mode; 65-ns min on-time allows stable 5-V-to-1.2-V conversion at 2 MHz without external compensation. |
| HDD Core Power Supply | Set-Top Box Local Regulation |
Use Scenario: Provides tightly regulated 1.2 V core voltage to 2.5-inch HDD controllers with fast load-step demands. IC Role / Device Role / Timing Role: High-bandwidth buck regulator with internal compensation and 2-A capability for dynamic current bursts. Use Value: Peak current-mode control delivers <50-µs recovery from 0–2-A load steps; 1% VFB accuracy ensures compliance with HDD core voltage tolerance (±3%). | Use Scenario: Converts 12-V main rail to 3.3-V and 1.8-V supplies for demodulator, tuner, and memory in consumer STBs. IC Role / Device Role / Timing Role: Synchronized buck converter sharing clock with other power stages to suppress beat frequencies and reduce conducted EMI. Use Value: SYNC pin enables deterministic phase alignment with other converters, lowering peak EMI by >10 dB compared to free-running operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27341SDX/NOPB | 1.5-A max output current; identical pinout, package, and feature set except lower current limit and higher RDS(ON) (150 mΩ vs. same, but derated for 1.5 A). | Not suitable for 2-A continuous loads; acceptable for 1.2-A peak applications with margin. | Select when thermal budget or cost constraints permit lower output current and reduced board-level current handling. |
| TPS54202DDCR | 2-A output, 4.5–17-V input, 500-kHz–2.5-MHz sync range, integrated FETs, but requires external compensation and lacks frequency foldback. | Higher quiescent current (48 µA vs. 70 nA), no OVP, and different pinout - not drop-in. | Choose for designs needing adjustable soft-start or higher input voltage tolerance, accepting trade-offs in shutdown current and protection features. |
Compared with LM27341SDX/NOPB, the LM27342SDX/NOPB provides 33% higher continuous current and identical thermal metrics in the same footprint; versus TPS54202DDCR, it offers superior low-power shutdown, built-in OVP/foldback, and simpler layout - at the cost of fixed compensation and narrower input range.
Availability
LM27342SDX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-C powered devices, and set-top box power management requiring stable component supply and long-term industrial availability.
Supply support for LM27342SDX/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.
The LM2734x product line was designed for space-constrained, high-frequency point-of-load applications in automotive, industrial, and consumer electronics - prioritizing integration, thermal efficiency, and EMI control without external compensation.
FAQ
What is the maximum continuous output current supported by the LM27342SDX/NOPB?
The LM27342SDX/NOPB supports 2 A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal layout). Its current limit is specified at 2.5 A minimum, and thermal resistance (RθJA = 47.6°C/W in WSON) enables this rating with standard 2-oz copper on a 3" × 3" board. Derating applies above 85°C ambient.
Does the LM27342SDX/NOPB require external compensation components?
No, the LM27342SDX/NOPB uses internal compensation and requires no external compensation network. Its peak current-mode architecture with fixed compensation simplifies design and reduces bill-of-materials count - only input/output capacitors, inductor, feedback resistors, and bootstrap capacitor are needed for basic operation.
How does the SYNC pin behave if the external clock signal is lost during operation?
If the external clock is lost, the LM27342SDX/NOPB automatically reverts to its internal 2-MHz oscillator within 1.5 µs. During this transition, regulation is maintained without interruption. The device remains synchronized to the last valid edge until the internal oscillator resumes, ensuring no output disturbance or dropout occurs.
Can the LM27342SDX/NOPB operate with a 2.5-V input voltage?
No - the LM27342SDX/NOPB has a minimum input voltage of 3 V per its recommended operating conditions. Below 3 V, undervoltage lockout prevents operation (UVLO threshold is 2.6–2.9 V), and the internal bootstrap LDO cannot sustain sufficient gate drive for the NMOS switch. Operation below 3 V is not functional or characterized.
What is the purpose of the DAP (exposed thermal pad) on the LM27342SDX/NOPB package?
The DAP on the LM27342SDX/NOPB serves as both a thermal conduction path and a low-impedance ground connection. It must be soldered to a dedicated GND copper pour on the PCB to achieve the specified RθJA = 47.6°C/W and ensure reliable 2-A operation. Leaving the DAP unconnected degrades thermal performance by >30°C/W and risks thermal shutdown under load.
LM27342SDX/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:
- 2A
- 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)
LM27342SDX/NOPB FAQ
1.How can I place an order for LM27342SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342SDX/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 LM27342SDX/NOPB reliable?
The price and inventory of LM27342SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342SDX/NOPB?
LM27342SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342SDX/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 LM27342SDX/NOPB?
For technical support, including LM27342SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342SDX/NOPB requirements.
6.How does Aetrix verify that LM27342SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342SDX/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 LM27342SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342SDX/NOPB?
All LM27342SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342SDX/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 LM27342SDX/NOPB part is unused and in its original packaging.
Return procedure for LM27342SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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