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Texas Instruments LM2831ZSDX/NOPB
- Part No.:
- LM2831ZSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831ZSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2831ZSDX/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin LLP package, delivering up to 1.5A output current with internal 130 mΩ PMOS switch, fixed 3.0 MHz switching frequency, 0.6 V ±2% reference voltage, and input range of 3.0 V to 5.5 V. It serves as a compact, high-frequency local power supply for low-voltage core rails in space-constrained USB-powered devices and set-top boxes.
For engineers reviewing the LM2831ZSDX/NOPB datasheet, LM2831ZSDX/NOPB pinout, LM2831ZSDX/NOPB application, or LM2831ZSDX/NOPB equivalent, key selection criteria include its 3.0 MHz fixed-frequency operation enabling ultra-small external inductors, thermal shutdown at 165°C, 30 nA shutdown current, internal soft-start (≈600 µs), and output overvoltage protection triggered at +15% above VFB.
Technical Context
The LM2831ZSDX/NOPB implements constant-frequency current-mode control with internal compensation, supporting fast transient response and stable regulation across 3.0 V–5.5 V input and 0.6 V–4.5 V output ranges. Its 3.0 MHz oscillator enables minimal inductor size while maintaining duty cycle control from 7% to 90%.
It integrates pulse-by-pulse current limiting (typ. 2.5 A), undervoltage lockout with 430 mV hysteresis (2.73 V rising, 2.3 V falling), and a dedicated VINA pin for control-circuit biasing separate from power-switch supply (VIND). The DAP (die attach pad) must be connected to system ground for thermal management but is not a primary GND path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3.0 MHz - enables use of ≤2.2 µH inductors and reduces PCB area by >50% vs. 550 kHz variants. |
| Output Current | 1.5 A continuous - sufficient for single-core processors, USB peripherals, and HDD preamp circuits. |
| Input Voltage Range | 3.0 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), USB 5 V, and regulated 3.3 V/5 V rails. |
| Feedback Reference | 0.600 V ±2% - sets output voltage via resistor divider; supports 0.6 V minimum output for modern low-VDD ICs. |
| Quiescent Current | 4.3–6.5 mA (active), 30 nA (shutdown) - enables battery-backed standby modes with negligible drain. |
| Thermal Shutdown | 165°C activation, ~150°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Current Limit | 1.8 A min / 2.5 A typ - provides robust short-circuit protection without requiring external sensing components. |
Pinout & Package
LM2831ZSDX/NOPB uses the 6-pin LLP (Leadless Leadframe Package) with exposed thermal pad (DAP), optimized for high-power density and thermal performance (θJA = 80°C/W, θJC = 18°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | High-impedance node monitoring output voltage via resistor divider; requires short trace routing to minimize noise coupling. |
| 2 (GND) | Signal and power ground | Reference point for feedback network and internal circuitry; bottom resistor of divider must connect here with minimal trace length. |
| 3 (SW) | Switch node | Connects to inductor and catch diode anode; carries high di/dt AC current - must be routed short and wide to reduce EMI. |
| 4 (VIND) | Power input supply | Primary power rail for internal PMOS switch; decoupled with ≥22 µF ceramic capacitor placed adjacent to pin. |
| 5 (VINA) | Control circuit supply | Bias voltage for error amplifier, oscillator, and logic; must be tied to VIND on PCB - not internally connected. |
| 6 (EN) | Enable control input | Logic-high active enable; threshold 1.8 V, max voltage VINA + 0.3 V - floating state disables regulator. |
| DAP | Die attach pad | Exposed copper pad for thermal conduction; must be soldered to solid ground plane with ≥4 thermal vias - not electrically functional as GND path. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 MHz fixed-frequency operation | Enables use of 1.6 µH inductors (e.g., TDK VLCF4018T-1R6N) and eliminates need for external frequency-setting components. |
| Internal 130 mΩ PMOS switch (SOT23-5) / 150 mΩ (LLP-6) | Reduces conduction loss at 1.5 A load to <170 mW - critical for efficiency in 3.3 V → 1.2 V conversion. |
| 0.6 V ±2% internal reference | Supports accurate 0.6 V output for CPU/GPU core rails and allows ±1% output tolerance with 1% resistors. |
| Internal soft-start (≈600 µs) | Prevents inrush current into output capacitors during power-up - eliminates need for external RC timing network. |
| Output overvoltage protection | Shuts off PMOS when FB exceeds 0.69 V (15% above VFB) - safeguards downstream 1.2 V or 1.8 V logic from fault conditions. |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
|
Use Scenario: Powering HDMI interface ICs, USB PHYs, and microcontrollers from a 5 V USB port in portable media adapters. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V USB input to 3.3 V or 1.8 V logic rails with fast load-step response. Use Value: 3.0 MHz switching minimizes inductor footprint (<2 mm²), enabling full power solution within tight USB dongle form factors. |
Use Scenario: Generating 1.2 V core voltage for ARM-based SoCs and 3.3 V I/O rails in consumer STB mainboards. IC Role / Device Role / Timing Role: Local DC/DC converter replacing linear regulators to improve thermal performance and efficiency under dynamic video processing loads. Use Value: 93% peak efficiency at 1.5 A reduces board-level heat dissipation by >40% vs. LDO alternatives. |
| HDD Preamp Circuits | DSL Modems |
|
Use Scenario: Supplying regulated 2.5 V or 3.3 V to read/write channel ICs and servo controllers in 2.5″ laptop HDDs. IC Role / Device Role / Timing Role: High-transient-response buck regulator handling rapid current spikes during head seek operations. Use Value: Current-mode control ensures stable regulation during 100 mA–1.5 A load steps with <50 µs recovery time. |
Use Scenario: Providing 1.8 V and 3.3 V supplies to ADSL line drivers, PHYs, and DSPs in residential broadband gateways. IC Role / Device Role / Timing Role: Compact, low-noise DC/DC source meeting EMI limits for Class B digital equipment. Use Value: Ultra-low 30 nA shutdown current extends backup battery life during power-fail events. |
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 | 3.0 MHz, 3 A output, 2.7–6 V input, integrated synchronous rectification, 17 µA quiescent current (active) | Higher current capability and synchronous architecture yield >5% higher efficiency at light loads; requires different feedback resistor values | Select when >1.5 A output or >95% efficiency at 100 mA load is required; layout changes needed due to 16-pin QFN package |
| MP2108DJ-LF-Z | 2.0 MHz, 1.5 A, 2.5–5.5 V input, 0.6 V reference, 25 µA quiescent current (active), no VINA/VIND separation | Simpler biasing (single VIN pin), lower IQ, but lacks VINA/VIND isolation and has reduced thermal margin (θJA = 120°C/W) | Preferred for cost-sensitive, non-thermally constrained designs where 2.0 MHz suffices and PCB real estate permits larger inductor |
Compared with TPS62130ARGTR and MP2108DJ-LF-Z, LM2831ZSDX/NOPB offers superior thermal performance in LLP packaging (θJA = 80°C/W), explicit VINA/VIND separation for improved noise immunity, and proven reliability in USB-powered consumer applications - making it optimal for thermally dense, noise-sensitive 3.0 MHz designs.
Availability
LM2831ZSDX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD preamp circuits, and DSL modems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2831ZSDX/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 and automotive-grade reliability.
The LM2831 product line was designed specifically for space-constrained, high-frequency local power conversion in consumer electronics - emphasizing minimal external component count, fast transient response, and robust protection features for unattended operation.
FAQ
What is the switching frequency of the LM2831ZSDX/NOPB?
The LM2831ZSDX/NOPB has a fixed internal switching frequency of 3.0 MHz, confirmed in the Electrical Characteristics table (FSW = 2.25–3.75 MHz, typical 3.0 MHz). This frequency is factory-set and cannot be adjusted externally. It enables use of sub-2 µH inductors and supports high-density PCB layouts in USB-powered and portable applications.
Does the LM2831ZSDX/NOPB require external compensation components?
No, the LM2831ZSDX/NOPB uses internal compensation and is fully stable with only five external components: input capacitor, output capacitor, inductor, catch diode, and feedback resistor divider. This simplifies design and eliminates tuning effort - a key feature highlighted in the General Description and Applications Information sections of the datasheet.
What is the purpose of the separate VINA and VIND pins on the LM2831ZSDX/NOPB?
VINA supplies bias voltage to the control circuitry (oscillator, error amplifier, logic), while VIND powers the internal PMOS switch. They must be connected together on the PCB but are kept separate internally to isolate noise-sensitive analog functions from high-current switching paths - improving regulation accuracy and EMI performance in noisy environments.
Can the LM2831ZSDX/NOPB operate with a 2.8 V input voltage?
No. The LM2831ZSDX/NOPB has a minimum operating input voltage of 3.0 V, with undervoltage lockout (UVLO) activating below 2.73 V (rising) and releasing only above 2.3 V (falling). Operation at 2.8 V falls within the UVLO hysteresis band and will result in intermittent or no regulation - a hard limit confirmed in the Absolute Maximum and Operating Ratings tables.
How does the LM2831ZSDX/NOPB handle output overvoltage conditions?
The LM2831ZSDX/NOPB includes dedicated output overvoltage protection that monitors the FB pin. When FB voltage exceeds 0.69 V (15% above the 0.6 V reference), the internal PMOS switch is immediately disabled, allowing the output to discharge through the catch diode until regulation resumes - protecting downstream 1.2 V or 1.8 V logic from damage during feedback divider failure or load transients.
LM2831ZSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2831ZSDX/NOPB FAQ
1.How can I place an order for LM2831ZSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZSDX/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 LM2831ZSDX/NOPB reliable?
The price and inventory of LM2831ZSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831ZSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZSDX/NOPB?
LM2831ZSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZSDX/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 LM2831ZSDX/NOPB?
For technical support, including LM2831ZSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZSDX/NOPB requirements.
6.How does Aetrix verify that LM2831ZSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831ZSDX/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 LM2831ZSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831ZSDX/NOPB?
All LM2831ZSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZSDX/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 LM2831ZSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2831ZSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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