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Texas Instruments LM27342SD/NOPB
- Part No.:
- LM27342SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM27342SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:997
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Product details
Overview
LM27342SD/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. It features a 150-mΩ internal NMOS switch, 1% feedback reference accuracy, 70-nA shutdown current, and frequency synchronization (1–2.35 MHz). It delivers regulated power for compact, high-density point-of-load applications such as USB-powered devices and set-top boxes.
For engineers reviewing the LM27342SD/NOPB datasheet, LM27342SD/NOPB pinout, LM27342SD/NOPB application, or LM27342SD/NOPB equivalent, key selection criteria include verified 2-A output capability, validated 2-MHz switching with sync support, confirmed 3 V to 20 V input range, and documented thermal performance in WSON packaging.
Technical Context
The LM27342SD/NOPB implements peak current-mode PWM control with internal compensation and fixed 2-MHz oscillator, synchronizable down to 1 MHz or up to 2.35 MHz via the SYNC pin. Its architecture includes an integrated bootstrap LDO (3.9 V output) driving the NMOS gate, cycle-by-cycle current limiting (2.5 A min), and frequency foldback during overcurrent events.
It supports wide-input operation (3–20 V) and wide-output regulation (1–18 V) using external resistor divider on FB, with soft-start time of 1 ms (typical) and thermal shutdown at 165°C (with 15°C hysteresis). The device uses a single inductor and external catch diode in standard buck topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A maximum continuous - enables single-chip supply for mid-power digital loads like HDD cores or radio subsystems. |
| Switching Frequency | 2 MHz nominal, 1–2.35 MHz sync range - allows use of sub-2.2 µH inductors and <100 µF ceramic output capacitors. |
| Input Voltage Range | 3 V to 20 V - supports direct 12-V rail conversion and wide automotive/industrial input variation. |
| Feedback Reference | 1.00 V ±1% - ensures ±1% output voltage accuracy across temperature and line conditions. |
| Shutdown Current | 70 nA typical - minimizes battery drain in always-on or low-power standby modes. |
| Internal Switch RDS(on) | 150 mΩ at 25°C - reduces conduction loss and improves efficiency at 2-A load, especially at lower VOUT. |
| Min On-Time | 65 ns - enables high duty-cycle operation at low VOUT/high VIN, e.g., 1.2 V out from 12 V in. |
Pinout & Package
LM27342SD/NOPB is housed in a thermally enhanced 3 mm × 3 mm, 10-pin WSON (DSC) package with exposed thermal pad (DAP) connected to GND. The DAP must be soldered to a PCB ground plane for optimal thermal performance (RθJB = 22.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects to inductor, catch diode cathode, and bootstrap capacitor - carries high di/dt switching current; requires tight layout and low-inductance path. |
| 3 BOOST | Bootstrap supply | Drives NMOS gate; requires 0.1 µF ceramic capacitor between BOOST and SW to sustain gate drive during high-side conduction. |
| 4 EN | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 70-nA quiescent draw - must not float. |
| 5 SYNC | Frequency sync input | Accepts external clock (1–2.35 MHz); grounding selects internal 2-MHz oscillator - eliminates beat frequencies in multi-rail systems. |
| 6 FB | Feedback input | Senses output voltage via resistor divider; internal 1-V reference sets VOUT = 1 V × (1 + R1/R2) - accuracy directly impacts regulation tolerance. |
| 7 GND | Signal & power ground | Reference for FB, EN, SYNC, and analog circuitry - place bottom feedback resistor adjacent to minimize noise coupling. |
| 8 AVIN | Analog supply | Powers control circuitry (error amp, oscillator, logic); bypass with 0.1 µF ceramic near pin for noise immunity. |
| 9, 10 PVIN | Power input | Supplies NMOS switch; requires local 4.7–10 µF low-ESR ceramic capacitor to handle high-frequency ripple current. |
| DAP | Thermal pad / GND | Exposed copper pad tied to internal GND and thermal mass - must be soldered to ≥2 cm² PCB ground plane for RθJA = 47.6°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistor. |
| Internal soft-start (1 ms) | Prevents inrush current and output overshoot during power-up by ramping internal reference from 0 V to 1 V. |
| Frequency foldback (220–250 kHz) | Reduces switching losses and thermal stress during short-circuit or overload by lowering fSW as FB drops below regulation. |
| Output overvoltage protection (1.13 V on FB) | Halts PWM immediately if feedback exceeds 13% above reference - protects downstream ICs from overvoltage damage. |
| Undervoltage lockout (2.6–2.9 V) | Prevents erratic startup or brownout operation by disabling regulator until PVIN exceeds valid threshold with 0.47 V hysteresis. |
Applications
| Local 12-V to Vcore Converters | Radio Power Supply |
|---|---|
Use Scenario: Converting 12-V automotive or industrial bus to 1.2–3.3 V core voltage for microcontrollers or RF transceivers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC supply with fast load-step response. Use Value: Delivers 2-A peak current with 1% reference accuracy and 65-ns minimum on-time - supports dynamic CPU/FPGA core scaling without voltage droop. | Use Scenario: Powering FM/AM/DAB radio modules in automotive infotainment or portable receivers. IC Role / Device Role / Timing Role: Compact, EMI-conscious DC-DC converter operating at 2 MHz to avoid AM band interference (530–1710 kHz). Use Value: Synchronization capability allows alignment with system clock or other rails - eliminates audible beat tones and simplifies filtering. |
| Core Power in HDDs | Set-Top Boxes |
Use Scenario: Supplying 5-V or 3.3-V logic and motor driver rails in consumer hard disk drives. IC Role / Device Role / Timing Role: High-efficiency, space-constrained buck regulator with thermal shutdown and overvoltage protection. Use Value: 90% efficiency at 2-A load and 47.6°C/W junction-to-ambient thermal resistance enable reliable operation in sealed, fanless enclosures. | Use Scenario: Generating multiple isolated DC rails (e.g., 3.3 V, 5 V, 12 V) in cable/satellite STB power trees. IC Role / Device Role / Timing Role: Secondary buck stage for low-noise digital supply, synchronized to main SMPS to reduce conducted EMI. Use Value: 70-nA shutdown current and internal soft-start simplify power sequencing - critical for multi-rail, low-standby-power 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 |
|---|---|---|---|
| LM27341SD/NOPB | 1.5-A max output, identical pinout and feature set except lower current rating and 2-A current limit. | Suitable where peak load ≤1.5 A; lower thermal stress but insufficient for 2-A sustained loads. | Select LM27341SD/NOPB only when full 2-A capability is unnecessary - reduces cost and board area without redesign. |
| TPS54202DDCR | 2-A, 4.5–17-V input, 500-kHz–2.5-MHz sync range, integrated FETs, but no BOOST pin - uses internal charge pump. | Better suited for 5-V input systems; lacks bootstrap flexibility for ultra-low VOUT or high-duty-cycle operation. | Choose TPS54202DDCR for simpler layout and lower BOM count where input >4.5 V and VOUT ≥1.8 V. |
Compared with LM27341SD/NOPB, the LM27342SD/NOPB provides higher current headroom and thermal margin; compared with TPS54202DDCR, it offers superior bootstrap control for low-VOUT and wider input range, at the cost of external diode requirement.
Availability
LM27342SD/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, set-top box power supplies, and industrial embedded controllers requiring stable component supply and long-term production continuity.
Supply support for LM27342SD/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 and embedded processing technologies, with leadership in power management ICs and high-reliability design.
The LM2734x product line was designed for space-constrained, high-frequency DC-DC conversion in automotive, industrial, and consumer electronics - emphasizing small footprint, thermal robustness, and EMI-aware operation.
FAQ
What is the maximum output current supported by the LM27342SD/NOPB?
The LM27342SD/NOPB supports a maximum continuous output current of 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 robust overload protection. This rating assumes adequate heatsinking via the DAP thermal pad and appropriate external components (inductor saturation current ≥2.5 A, low-ESR output capacitors).
Does the LM27342SD/NOPB require an external catch diode?
Yes, the LM27342SD/NOPB requires an external Schottky catch diode (e.g., D1 in typical application circuits) because it is a non-synchronous buck controller with a single internal NMOS switch. The diode provides the return path for inductor current during the switch off-time. A low-forward-voltage, fast-recovery Schottky diode rated for ≥2.5 A peak current is mandatory for efficiency and reliability.
How does the BOOST pin function in the LM27342SD/NOPB?
The BOOST pin on the LM27342SD/NOPB supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor connected between BOOST and SW. During switch off-time, the SW node goes negative through the catch diode, charging the capacitor. During on-time, the stored voltage (VBOOST – VSW) drives the gate - enabling high-side NMOS operation. A 0.1 µF ceramic capacitor is required; improper sizing causes gate drive collapse and switch failure.
Can the LM27342SD/NOPB operate with input voltage below 5 V?
Yes, the LM27342SD/NOPB operates with input voltages as low as 3 V. However, at VIN < 5 V and duty cycles >75%, the internal bootstrap may fail to maintain sufficient gate drive. In such cases, an external Schottky diode must connect a stable 5-V rail to the BOOST pin to ensure reliable NMOS turn-on - per TI's Figure 28 application note.
What thermal considerations apply to the LM27342SD/NOPB in WSON packaging?
The LM27342SD/NOPB in 10-pin WSON (DSC) package has RθJA = 47.6°C/W on a 3" × 3" 4-layer PCB with 2 oz copper. To maintain TJ ≤ 125°C at 2-A load, ambient must stay ≤75°C with proper DAP soldering to ≥2 cm² ground plane. Thermal shutdown activates at 165°C (15°C hysteresis), so board-level thermal design - including copper area, vias under DAP, and airflow - is critical for sustained 2-A operation.
LM27342SD/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)
LM27342SD/NOPB FAQ
1.How can I place an order for LM27342SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27342SD/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 LM27342SD/NOPB reliable?
The price and inventory of LM27342SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27342SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM27342SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27342SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27342SD/NOPB?
LM27342SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27342SD/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 LM27342SD/NOPB?
For technical support, including LM27342SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27342SD/NOPB requirements.
6.How does Aetrix verify that LM27342SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27342SD/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 LM27342SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM27342SD/NOPB?
All LM27342SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27342SD/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 LM27342SD/NOPB part is unused and in its original packaging.
Return procedure for LM27342SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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