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Texas Instruments LM2831XSDX/NOPB
- Part No.:
- LM2831XSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831XSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,040
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Product details
Overview
LM2831XSDX/NOPB from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator IC in a 5-pin SOT-23 package, delivering up to 1.5-A output current with 0.6-V internal reference voltage, 1.6-MHz fixed switching frequency, and 130-mΩ integrated PMOS switch. It operates from 3 V to 5.5 V input and regulates down to 0.6 V output-ideal for compact core power supplies in USB-powered devices.
For engineers reviewing the LM2831XSDX/NOPB datasheet, LM2831XSDX/NOPB pinout, LM2831XSDX/NOPB application, or LM2831XSDX/NOPB equivalent, key selection considerations include its 1.6-MHz switching frequency enabling ultra-small passive components, internal soft-start limiting inrush current, current-mode control for fast transient response, and thermal shutdown at 165°C for robust operation in space-constrained embedded systems.
Technical Context
The LM2831XSDX/NOPB implements constant-frequency current-mode PWM control with an internal 0.6-V ±2% reference and artificial ramp compensation. Its 1.6-MHz oscillator enables sub-4-mm² solution size using ceramic capacitors and low-profile inductors, while cycle-by-cycle current limiting (2.5-A typical) and overvoltage protection (15% above VREF) ensure safe operation under fault conditions.
It features undervoltage lockout with 2.73-V enable threshold and 430-mV hysteresis, internal soft-start with ~600-µs ramp time, and shutdown quiescent current of only 30 nA. The device uses a single-stage error amplifier with internal compensation, eliminating external loop compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤3.3-µH inductors and 22-µF ceramic capacitors for minimal PCB footprint |
| Output Current | 1.5 A continuous - supports core rail requirements for HDDs, set-top boxes, and USB peripherals |
| Input Voltage Range | 3 V to 5.5 V - compatible with single-cell Li-ion, USB 5-V, and regulated 3.3-V/5-V system rails |
| Feedback Reference | 0.6 V ±2% - sets precise output voltage via external resistor divider; supports 0.6 V to 4.5 V programmable range |
| PMOS Switch RDS(ON) | 130 mΩ at TJ = 25°C - limits conduction loss; enables >93% peak efficiency at 1.5-A load with 5-V input |
| Quiescent Current | 3.3 mA (switching), 30 nA (shutdown) - ensures low standby power in battery-backed or always-on applications |
| Thermal Shutdown | 165°C activation, ~150°C recovery - provides self-protection during overload or poor heatsinking without latch-up |
Pinout & Package
LM2831XSDX/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, with exposed pad omitted (no thermal DAP). Pin functions are validated per TI SNVS422D Rev D datasheet.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to 3–5.5-V supply; bypassed externally with ≥22-µF ceramic capacitor near pin |
| SW | Switch node | Drives inductor and catch diode; requires low-inductance layout to minimize EMI and switching losses |
| EN | Enable control | Logic-high (>1.8 V) enables regulation; floating or >VIN+0.3 V risks damage; 30-nA shutdown current |
| FB | Feedback input | Senses output voltage via resistor divider; 0.1-nA bias current enables high-impedance divider design |
| GND | Signal/power ground | Primary return path; feedback resistor bottom must connect directly here to avoid regulation error |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps reference from 0 V to 0.6 V over ~600 µs, limiting inrush current into output capacitance |
| Current-mode PWM control | Enables inherent line/load transient response <10 µs and eliminates need for external loop compensation |
| Overvoltage protection | Shuts off PMOS switch when FB exceeds 0.69 V (15% above 0.6 V), preventing output overvoltage faults |
| Undervoltage lockout | Enables only above 2.73 V (typical) with 430-mV hysteresis, avoiding brownout oscillation during power ramp |
| Thermal shutdown | Disables switching at 165°C junction temperature and auto-recovers at ~150°C, enabling safe fault recovery |
Applications
| Local 5 V to Vcore Step-Down Converters | Core Power in HDDs |
|---|---|
Use Scenario: Regulating 5-V USB or system rail to 1.2-V or 1.8-V processor core voltage in portable storage enclosures. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core supply with fast load-step response. Use Value: 1.6-MHz switching allows small 3.3-µH inductor and 2×22-µF X5R ceramics, reducing board area by >40% vs lower-frequency alternatives. |
Use Scenario: Powering spindle motor controller and read/write channel ASICs in 2.5-inch hard disk drives. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering stable 1.5-A core rail from 5-V bus. Use Value: 93% peak efficiency at 1.5-A load minimizes thermal dissipation in sealed drive enclosures with limited airflow. |
| Set-Top Boxes | USB Powered Devices |
Use Scenario: Generating 3.3-V or 1.2-V logic rails from 5-V USB-C or wall adapter input in consumer media boxes. IC Role / Device Role / Timing Role: Compact, low-EMI DC-DC converter supporting burst-mode operation during video decode idle periods. Use Value: 30-nA shutdown current extends standby battery life in hybrid AC/USB-powered units with remote wake capability. |
Use Scenario: Providing regulated 3.3-V or 1.2-V supply for microcontrollers, sensors, or audio codecs in bus-powered USB peripherals. IC Role / Device Role / Timing Role: Single-chip buck solution eliminating external MOSFETs, drivers, and compensation networks. Use Value: SOT-23 footprint and internal 130-mΩ switch reduce BOM count to just inductor, diode, and two capacitors-accelerating design-in. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3-MHz switching, 95% efficiency, 2-A output, WQFN-16 package; requires external compensation | Better efficiency and higher current, but larger footprint and more complex layout due to 16-pin QFN and compensation network | Select when >1.5-A output or tighter ripple specs are required; avoid if SOT-23 footprint and minimal BOM are mandatory |
| MP1471GJ-Z | 1.4-MHz switching, 1.2-A output, 150-mΩ switch, TSOT23-6 package; no internal soft-start | Lower cost and similar frequency, but reduced current capability and missing soft-start increases inrush risk | Acceptable for 1.2-A loads where soft-start is managed externally; not recommended for 1.5-A or low-ESR ceramic-capacitor designs |
Compared with TPS62130ARGTR and MP1471GJ-Z, LM2831XSDX/NOPB delivers optimal balance of 1.5-A capability, 1.6-MHz frequency, SOT-23 simplicity, and integrated soft-start-making it uniquely suited for space-constrained, USB-powered, and HDD core applications requiring rapid design completion.
Availability
LM2831XSDX/NOPB is available at Aetrix Electronics and suitable for local 5-V-to-core-rail conversion, HDD core power, set-top box logic supplies, and USB-powered peripheral designs requiring stable component supply across production lifecycles.
Supply support for LM2831XSDX/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 designing analog, embedded processing, and digital signal solutions for industrial, automotive, and consumer markets.
LM2831XSDX/NOPB belongs to TI's high-frequency buck regulator product line, engineered specifically for compact, efficient point-of-load conversion in space- and power-sensitive applications like portable storage and USB peripherals.
FAQ
What is the switching frequency of the LM2831XSDX/NOPB?
The LM2831XSDX/NOPB has a fixed internal switching frequency of 1.6 MHz, confirmed in the Electrical Characteristics table of TI SNVS422D Rev D. This frequency enables use of small surface-mount inductors (e.g., 3.3 µH) and ceramic capacitors while maintaining high efficiency (>93% at 1.5-A load with 5-V input) and fast transient response.
Does the LM2831XSDX/NOPB require external compensation components?
No, the LM2831XSDX/NOPB uses internal compensation and current-mode control architecture, eliminating the need for external compensation networks. As stated in the Functional Block Diagram and Feature Description sections of the datasheet, this simplifies design and reduces BOM count to only five external components: input/output capacitors, inductor, feedback resistors, and catch diode.
What is the maximum output current supported by the LM2831XSDX/NOPB?
The LM2831XSDX/NOPB is rated for 1.5-A continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN = 3–5.5 V). The datasheet specifies a typical current limit of 2.5 A with a minimum guaranteed limit of 1.8 A across –40°C to 125°C, ensuring reliable operation at full rated load with appropriate thermal design.
How does the LM2831XSDX/NOPB handle thermal overload?
The LM2831XSDX/NOPB incorporates thermal shutdown that activates at 165°C junction temperature and recovers automatically when the junction cools to approximately 150°C. This hysteresis prevents cycling and protects the IC during sustained overload or inadequate heatsinking, as documented in Section 7.3.6 and Table 6.5 of the SNVS422D datasheet.
Can the LM2831XSDX/NOPB operate with a 0.6-V output voltage?
Yes, the LM2831XSDX/NOPB supports output voltages as low as 0.6 V, matching its internal 0.6-V reference voltage. The datasheet explicitly lists "Output Voltage Range of 0.6 V to 4.5 V" and provides a design example (Figure 24) achieving 0.6 V @ 1.5 A using R1 = 0 Ω and R2 = 10 kΩ, confirming direct support for minimum-reference operation.
LM2831XSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4.5V
- 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:
- 6-WSON (3x3)
LM2831XSDX/NOPB FAQ
1.How can I place an order for LM2831XSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831XSDX/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 LM2831XSDX/NOPB reliable?
The price and inventory of LM2831XSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831XSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831XSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831XSDX/NOPB transactions.
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4.How is shipping managed for LM2831XSDX/NOPB?
LM2831XSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831XSDX/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 LM2831XSDX/NOPB?
For technical support, including LM2831XSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831XSDX/NOPB requirements.
6.How does Aetrix verify that LM2831XSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831XSDX/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 LM2831XSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831XSDX/NOPB?
All LM2831XSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831XSDX/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 LM2831XSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2831XSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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