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Texas Instruments LM27342MY/NOPB
- Part No.:
- LM27342MY/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LM27342MY/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
LM27342MY/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 internal 150-mΩ NMOS switch, 1% feedback reference accuracy, and frequency synchronization support (1–2.35 MHz). It delivers regulated power for compact, high-density applications such as USB-powered devices and set-top boxes.
For engineers reviewing the LM27342MY/NOPB datasheet, LM27342MY/NOPB pinout, LM27342MY/NOPB application, or LM27342MY/NOPB equivalent, key selection criteria include output current capability (2 A), input voltage range (3 V to 20 V), shutdown current (70 nA), thermal shutdown threshold (165°C), and peak current-mode control architecture.
Technical Context
The LM27342MY/NOPB implements constant-frequency, peak current-mode PWM control with internal compensation and fixed 2-MHz oscillator (synchronizable 1–2.35 MHz). Its bootstrap gate drive enables high-side NMOS switching with on-time as low as 65 ns, supporting high duty-cycle operation down to ~1 V output.
It integrates undervoltage lockout (2.75 V typ.), overvoltage protection (1.13 V FB threshold), pulse-by-pulse current limiting (2.5 A min.), and thermal shutdown (165°C). The dual-input supply architecture separates AVIN (control logic) from PVIN (power stage), improving noise immunity and efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 2 A max - supports high-current local regulation without external MOSFETs or complex layout. |
| Input voltage range | 3 V to 20 V - accommodates 5 V, 12 V, and automotive battery rails with no pre-regulation needed. |
| Switching frequency | 2 MHz (internal), synchronizable 1–2.35 MHz - enables use of sub-2.2 µH inductors and <100 µF ceramic output caps. |
| Feedback reference | 1.00 V ±1% - ensures ±1.8% output voltage accuracy across temperature and line conditions. |
| Shutdown current | 70 nA - minimizes system standby power loss in battery-backed or always-on applications. |
| On-resistance | 150 mΩ (25°C), 320 mΩ (–40°C to 125°C) - defines conduction loss and thermal rise under full load. |
| Minimum on-time | 65 ns - enables high step-down ratios (e.g., 12 V → 1.2 V at 10% duty cycle) at 2 MHz. |
Pinout & Package
LM27342MY/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 thermal performance. Pin 1 is SW (switch node); pins 9–10 are PVIN (power input); pin 7 is GND/DAP (signal and thermal ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (pins 1, 2) | Switch node | Connects to inductor, catch diode, and bootstrap capacitor; carries high di/dt switching current. |
| BOOST (pin 3) | Bootstrap supply | Drives NMOS gate via external capacitor; voltage = VSW + ~3.9 V LDO output. |
| EN (pin 4) | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 70 nA quiescent draw. |
| SYNC (pin 5) | Frequency sync input | Accepts external clock (1–2.35 MHz); grounded to use internal 2-MHz oscillator. |
| FB (pin 6) | Feedback input | Senses output via resistor divider; regulates VOUT = 1.00 V × (1 + R1/R2). |
| GND/DAP (pin 7) | Signal & thermal ground | Reference for FB, EN, SYNC; DAP must be soldered to PCB ground plane for thermal management. |
| AVIN (pin 8) | Analog supply | Powers control circuitry (error amp, oscillator, logic); decoupled separately from PVIN. |
| PVIN (pins 9, 10) | Power input | Supplies NMOS switch and bootstrap LDO; requires low-ESR bulk capacitance near pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-mΩ NMOS switch | Eliminates external high-side FET and driver, reducing BOM count and PCB area by >30% vs discrete solutions. |
| 2-MHz fixed + sync-capable oscillator | Enables <1.0 mm height designs using 1.0 µH inductors and 44 µF ceramic output capacitors. |
| Peak current-mode control | Provides inherent cycle-by-cycle current limiting and stable operation without external compensation components. |
| Internal soft-start (1 ms) | Prevents inrush current during power-up, eliminating need for external soft-start timing circuits or resistors. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction; restarts at ~150°C, preventing thermal runaway in enclosed or high-ambient environments. |
Applications
| USB Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering HDMI interface ICs, USB PHYs, and SoC peripherals from 5-V USB bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3 V or 1.8 V at up to 2 A with fast transient response. Use Value: 2-MHz switching avoids audible noise and fits within tight board space constraints typical of dongle-sized enclosures. |
Use Scenario: Local conversion of 12-V main rail to 5-V/3.3-V for demodulator, tuner, and memory subsystems. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with sync capability to avoid beat frequencies with video clock domains. Use Value: Frequency synchronization (1–2.35 MHz) eliminates EMI interference with 13.5-MHz pixel clocks and RF front-end signals. |
| Radio Power Supply | Automotive Infotainment |
Use Scenario: Generating stable 2.5-V or 3.3-V supply for FM/AM receiver ICs and audio codecs in portable radios. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC converter with ultra-low shutdown current for battery backup operation. Use Value: 70-nA shutdown current extends shelf life and runtime in always-connected but intermittently active radio modules. |
Use Scenario: Converting 12-V vehicle battery to 5-V/3.3-V for display controllers and touch processors in head units. IC Role / Device Role / Timing Role: Automotive-grade capable regulator (LM27342-Q1 variant exists) with wide VIN and thermal robustness. Use Value: 3-V to 20-V input range tolerates cold-crank (6.5 V) and load-dump (28 V) transients when paired with appropriate input protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27341MY/NOPB | 1.5-A output current, identical pinout and features except lower current limit and higher RDS(ON) (180 mΩ vs 150 mΩ). | Lower power density; suitable where 1.5-A max load suffices and thermal margin is constrained. | Select LM27341MY/NOPB only if load current never exceeds 1.5 A and board-level thermal design cannot accommodate LM27342MY/NOPB's higher dissipation. |
| TPS54202DDCR | 2-A, 4.5–17-V input, 500-kHz–1.7-MHz sync range, integrated soft-start, but no separate AVIN/PVIN rails. | Lacks dual-supply isolation; less suited for noisy automotive or industrial environments requiring AVIN filtering. | Choose TPS54202DDCR when cost sensitivity outweighs need for independent analog/power supply routing and 2-MHz operation. |
Compared with LM27341MY/NOPB, LM27342MY/NOPB provides 33% higher output current and lower RDS(ON), enabling smaller thermal solution size; versus TPS54202DDCR, it offers higher switching frequency and dedicated AVIN for improved noise immunity, at the expense of narrower sync range and no programmable soft-start.
Availability
LM27342MY/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, radio power supplies, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM27342MY/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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.
The LM2734x series was developed specifically for space-constrained, high-frequency DC-DC conversion in consumer, industrial, and automotive applications where small inductors, low-profile layouts, and reliable regulation under dynamic loads are critical.
FAQ
What is the maximum output current supported by LM27342MY/NOPB?
The LM27342MY/NOPB delivers up to 2 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper thermal layout). Its current limit is specified at 2.5 A minimum across –40°C to 125°C, ensuring robust overload protection. Actual achievable current depends on ambient temperature, PCB copper area, and input/output voltage differential.
Does LM27342MY/NOPB require an external bootstrap diode?
No, LM27342MY/NOPB does not require an external bootstrap diode. It integrates a dedicated boost LDO (3.9 V output) and internal charge path to develop gate drive voltage across the external BOOST capacitor. An external Schottky diode is only recommended when operating below 5 V input with >75% duty cycle to ensure sufficient gate drive margin.
Can LM27342MY/NOPB operate with a 3.3-V input supply?
Yes, LM27342MY/NOPB supports input voltages as low as 3 V. However, at 3.3-V input and high duty cycles (e.g., 3.3 V → 1.2 V), the internal bootstrap circuit may require minimum load current (≥100 mA) to maintain sufficient VBOOST–VSW. Refer to Section 7.3.3 of the datasheet for minimum load guidelines per output voltage.
What is the purpose of the separate AVIN and PVIN pins on LM27342MY/NOPB?
AVIN powers the analog control circuitry (oscillator, error amplifier, logic), while PVIN supplies the power stage (NMOS switch and bootstrap LDO). This separation reduces noise coupling from high-current switching into sensitive analog blocks, improving regulation accuracy and stability-especially critical in EMI-sensitive applications like radio or audio systems.
How does frequency synchronization work on LM27342MY/NOPB?
LM27342MY/NOPB accepts an external clock (1–2.35 MHz) on the SYNC pin to override its internal 2-MHz oscillator. At the first rising edge, it locks phase and frequency; if SYNC is lost, it reverts to internal clock within 1.5 µs. Grounding SYNC selects internal operation. Synchronization eliminates beat frequencies between multiple converters and allows EMI band avoidance.
LM27342MY/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
LM27342MY/NOPB FAQ
1.How can I place an order for LM27342MY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342MY/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 LM27342MY/NOPB reliable?
The price and inventory of LM27342MY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342MY/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342MY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342MY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342MY/NOPB?
LM27342MY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342MY/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 LM27342MY/NOPB?
For technical support, including LM27342MY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342MY/NOPB requirements.
6.How does Aetrix verify that LM27342MY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342MY/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 LM27342MY/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342MY/NOPB?
All LM27342MY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342MY/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 LM27342MY/NOPB part is unused and in its original packaging.
Return procedure for LM27342MY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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