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Texas Instruments LM2738XSD/NOPB
- Part No.:
- LM2738XSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM2738XSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
LM2738XSD/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator delivering 1.5-A output at up to 90% efficiency, with fixed 1.6-MHz switching frequency, 250-mΩ internal NMOS switch, and 0.8-V ±2% reference voltage - used for compact point-of-load regulation in USB-powered devices and set-top boxes.
For engineers reviewing the LM2738XSD/NOPB datasheet, LM2738XSD/NOPB pinout, LM2738XSD/NOPB application, or LM2738XSD/NOPB equivalent, key selection criteria include input voltage range (3–20 V), output voltage adjustability (0.8–18 V), shutdown current (400 nA), thermal shutdown threshold (165°C), and WSON-8 package compatibility with high-density PCB layouts.
Technical Context
The LM2738XSD/NOPB implements constant-frequency current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 1.6-MHz oscillator allows use of sub-3-mm ceramic inductors and chip capacitors while maintaining fast transient response.
It integrates cycle-by-cycle current limiting (2.9-A typical), undervoltage lockout (2.7-V rising threshold), soft-start (600-µs ramp), and output overvoltage protection (16% above VREF). The BOOST pin supports gate-drive voltage generation via external bootstrap capacitor and diode, requiring VBOOST–VSW between 2.5 V and 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤2.2-µH inductors and low-ESR ceramic output capacitors in space-constrained designs. |
| Output Current | 1.5 A continuous - supports core power delivery for HDDs, DSL modems, and USB peripherals without external pass devices. |
| Input Voltage Range | 3 V to 20 V - accommodates single-cell Li-ion (3.0–4.2 V), 5-V USB, 12-V industrial rails, and unregulated wall adapters. |
| Feedback Reference | 0.8 V ±2% - sets output voltage via resistor divider (e.g., 3.3 V with R1 = 8.87 kΩ, R2 = 10.2 kΩ) with <0.02%/V line regulation. |
| Shutdown Current | 400 nA - enables ultra-low-power standby in battery-operated systems without external disconnect switches. |
| Internal Switch RDS(ON) | 250 mΩ - limits conduction loss at full load; combined with 1.6-MHz operation, achieves >85% efficiency at 1.5-A/3.3-V output from 12-V input. |
| Thermal Shutdown | 165°C - protects against sustained overload or poor heatsinking; auto-recovery occurs at ~150°C junction temperature. |
Pinout & Package
LM2738XSD/NOPB uses an 8-pin WSON package (3.0 mm × 3.0 mm, 0.65-mm pitch) with exposed thermal pad (DAP) connected to GND for enhanced thermal performance (RθJB = 13.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply input | Drives NMOS gate during on-time; requires 0.1-µF X7R capacitor to SW; must maintain 2.5–5.5 V above SW node. |
| 2,3 - VIN / VCC | Power input & bias rail | Tied together externally; supplies power stage and internal circuitry; bypassed with ≥10-µF X5R capacitor near pin. |
| 4 - EN | Enable control | Logic-high (>1.4 V) enables regulation; logic-low (<0.4 V) disables with 400-nA quiescent current; must not exceed VIN + 0.3 V. |
| 5,7 - GND | Signal & power ground | Common return for feedback network, SW node path, and thermal pad; layout requires low-inductance connection to DAP. |
| 6 - FB | Feedback input | Senses output voltage via resistor divider; 0.8-V reference sets VOUT = 0.8 × (1 + R1/R2); input bias current <100 nA minimizes divider error. |
| 8 - SW | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN – ILOAD×RDS(ON) during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable operation without external compensation components. |
| Internal soft-start | Ramps reference voltage over 600 µs to limit in-rush current during power-up, reducing stress on input capacitors and source. |
| Output overvoltage protection | Disables switch when FB exceeds 0.928 V (16% above 0.8-V reference), preventing damage to downstream loads during feedback fault. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and resumes at ~150°C, avoiding thermal oscillation under marginal cooling conditions. |
| Low-noise enable interface | EN pin draws only 10 nA bias current and features 1.4-V turn-on / 0.4-V turn-off thresholds for clean digital control. |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering HDMI interface ICs, tuners, and memory controllers from 5-V USB-C or legacy USB ports. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3-V or 1.8-V rails with fast load-step response to handle burst data transfers. Use Value: 1.6-MHz operation avoids audible noise and enables compact 2.2-µH inductors; 400-nA shutdown extends battery life in portable STBs. | Use Scenario: Generating core voltage for SoCs and DDR memory in cable/satellite receivers with tight board area constraints. IC Role / Device Role / Timing Role: Local point-of-load converter placed adjacent to processor die to minimize IR drop and improve transient immunity. Use Value: 250-mΩ RDS(ON) and internal compensation reduce BOM count by two components versus discrete controller solutions. |
| HDD Core Power | Battery-Powered Devices |
Use Scenario: Supplying 5-V or 3.3-V motor driver and logic rails in 2.5-inch laptop HDDs with limited thermal mass. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from 12-V spindle supply, supporting rapid spin-up current surges. Use Value: Cycle-by-cycle current limit (2.9-A typical) prevents latch-up during motor stall; thermal shutdown protects against enclosure overheating. | Use Scenario: Regulating battery voltage (3.0–4.2 V) to stable 1.2-V or 1.5-V MCU core supply in handheld medical monitors and IoT sensors. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter maintaining regulation during deep-sleep modes with microamp-level system leakage. Use Value: 400-nA shutdown current enables multi-year battery life; 0.8-V reference supports precise low-voltage rail generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2738YSD/NOPB | Fixed 550-kHz switching frequency; higher minimum duty cycle (2% vs 7.5%) and lower boost current (2.5 mA vs 4.5 mA). | Better suited for higher-input/lower-output ratios (e.g., 12 V → 5 V) where larger inductors are acceptable; less optimal for ultra-compact 5 V → 3.3 V designs. | Select LM2738YSD/NOPB when EMI sensitivity favors lower frequency or when using larger, lower-cost inductors; LM2738XSD/NOPB preferred for minimal footprint. |
| TPS62231DRVR | 3-MHz fixed-frequency, 0.6-V reference, 2-A output, integrated MOSFETs, but requires external compensation and lacks OVP. | Targets higher-current, higher-precision applications (e.g., FPGA core rails); no built-in overvoltage protection limits use in safety-critical subsystems. | Choose TPS62231DRVR for 2-A capability and tighter reference tolerance; retain LM2738XSD/NOPB when OVP, thermal shutdown, and proven 1.5-A reliability are mandatory. |
Compared with LM2738YSD/NOPB, LM2738XSD/NOPB trades slightly higher boost current for 2.9× faster switching, enabling smaller passives and better transient response; versus TPS62231DRVR, it offers integrated protection features and simpler layout at the cost of 0.5-A lower current rating and looser reference tolerance.
Availability
LM2738XSD/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, and battery-powered instrumentation requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.
Supply support for LM2738XSD/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-efficiency DC-DC conversion.
The LM2738XSD/NOPB belongs to TI's high-frequency buck regulator product line, designed specifically for space-constrained, medium-current point-of-load applications where integration, thermal robustness, and protection features outweigh the need for programmable frequency or remote sensing.
FAQ
What is the maximum recommended input voltage for LM2738XSD/NOPB?
The absolute maximum input voltage for LM2738XSD/NOPB is 24 V, but the recommended operating range is 3 V to 20 V per the datasheet. Exceeding 20 V risks violating the boost-to-SW voltage limit (max 5.5 V) and may trigger thermal shutdown due to increased power dissipation in the 250-mΩ internal switch. For reliable operation, keep VIN ≤20 V with adequate derating margin.
Does LM2738XSD/NOPB require external compensation components?
No, LM2738XSD/NOPB features fully internal compensation optimized for current-mode control, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and ensures stability across the full 3–20-V input range and 0.8–18-V output range without tuning.
How does the BOOST pin function in LM2738XSD/NOPB?
The BOOST pin on LM2738XSD/NOPB supplies gate drive to the internal NMOS switch via an external bootstrap capacitor connected to the SW pin. During switch off-time, the capacitor charges from VIN through an external diode; during on-time, it provides ~VIN-level gate voltage relative to SW, ensuring full enhancement of the 250-mΩ switch. VBOOST must stay 2.5–5.5 V above SW to guarantee proper operation.
Can LM2738XSD/NOPB be used in automotive applications?
LM2738XSD/NOPB is qualified for industrial temperature range (–40°C to +125°C) and includes automotive-relevant protections (UVLO, thermal shutdown, OVP, current limit), but it is not AEC-Q200 qualified. For non-safety-critical automotive subsystems (e.g., infotainment displays, body control modules), it may be deployed with customer validation; TI recommends LM61480-Q1 or similar AEC-Q100 parts for ASIL-B/C systems.
What is the purpose of the EN pin on LM2738XSD/NOPB?
The EN pin on LM2738XSD/NOPB provides logic-level enable/disable control: applying ≥1.4 V enables regulation with full 1.5-A capability, while ≤0.4 V places LM2738XSD/NOPB in shutdown mode drawing only 400 nA. The pin must never exceed VIN + 0.3 V and should be pulled to GND or controlled by a microcontroller GPIO to manage system power sequencing and battery conservation.
LM2738XSD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-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):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x3)
LM2738XSD/NOPB FAQ
1.How can I place an order for LM2738XSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2738XSD/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 LM2738XSD/NOPB reliable?
The price and inventory of LM2738XSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2738XSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2738XSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2738XSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2738XSD/NOPB?
LM2738XSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2738XSD/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 LM2738XSD/NOPB?
For technical support, including LM2738XSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2738XSD/NOPB requirements.
6.How does Aetrix verify that LM2738XSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2738XSD/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 LM2738XSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2738XSD/NOPB?
All LM2738XSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2738XSD/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 LM2738XSD/NOPB part is unused and in its original packaging.
Return procedure for LM2738XSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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