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Texas Instruments LM2831ZSD
- Part No.:
- LM2831ZSD
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831ZSD.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,465
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Product details
Overview
LM2831ZSD from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in a 6-pin LLP package, delivering up to 1.5A output current with an internal 150 mΩ PMOS switch. It operates from 3.0V to 5.5V input, regulates output down to 0.6V, and features fixed 3.0 MHz switching frequency for compact power conversion in space-constrained USB-powered devices and HDD core supplies.
For engineers reviewing the LM2831ZSD datasheet, LM2831ZSD pinout, LM2831ZSD application, or LM2831ZSD equivalent, key selection considerations include its 3.0 MHz switching frequency enabling ultra-small inductors, 0.6V ±2% internal reference accuracy, thermal shutdown at 165°C, 30 nA shutdown current, and LLP-6 package with exposed thermal pad for enhanced power dissipation.
Technical Context
The LM2831ZSD uses current-mode PWM control with internal compensation, supporting fast transient response and stable regulation across load and line variations. Its 3.0 MHz fixed switching frequency (±0.75 MHz tolerance) enables use of sub-2 µH inductors and ceramic capacitors while maintaining efficiency up to 93% at 1.5A.
It integrates pulse-by-pulse current limiting (typ. 2.5A), internal soft-start (~600 µs ramp), output overvoltage protection (15% above VFB), and undervoltage lockout with 430 mV hysteresis. The 6-pin LLP package includes separate VIND and VINA pins to isolate power and control supply paths, improving noise immunity and regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3.0 MHz (±0.75 MHz); enables use of ≤1.6 µH inductors and reduces PCB area by >40% vs. 550 kHz variants. |
| Input Voltage Range | 3.0 V to 5.5 V; compatible with single-cell Li-ion, USB 5V, and regulated 3.3V/5V rails. |
| Output Voltage Range | 0.6 V to 4.5 V; set via external resistor divider with 0.600 V ±2% internal reference. |
| Max Output Current | 1.5 A continuous; supported by internal 150 mΩ PMOS switch (LLP-6 package). |
| Quiescent Current | 4.3–6.5 mA (active), 30 nA (shutdown); enables battery-friendly operation in portable systems. |
| Thermal Shutdown | 165°C junction temperature; hysteresis ~15°C ensures reliable recovery at ~150°C. |
| Feedback Voltage Accuracy | 0.588 V to 0.612 V (−2% to +2%); ensures ±1.5% output voltage accuracy over temp and load. |
Pinout & Package
The LM2831ZSD is housed in a thermally enhanced 6-pin LLP (Leadless Leadframe Package) with exposed die attach pad (DAP) for low thermal impedance. DAP must be soldered to system ground plane using ≥4 thermal vias for optimal thermal performance (θJA = 80°C/W, θJC = 18°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | High-impedance node sensing output voltage via resistor divider; requires short trace and local decoupling to avoid noise-induced regulation error. |
| 2 (GND) | Signal and power ground | Reference for FB, EN, and internal circuitry; must connect to PCB ground plane near feedback resistors and input capacitor. |
| 3 (SW) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring minimized loop area and tight layout to reduce EMI. |
| 4 (VIND) | Power input supply | Primary input path for switch current; connects directly to input capacitor and must be routed wide/short to minimize IR drop and ringing. |
| 5 (VINA) | Control circuitry supply | Bias supply for internal logic and error amplifier; must be tied to VIND on PCB to ensure proper enable threshold and UVLO behavior. |
| 6 (EN) | Enable control input | Logic-high active enable; threshold 1.8 V (min), max voltage VINA + 0.3 V; floating state disables device. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 MHz fixed-frequency operation | Enables <1.6 µH inductors and eliminates need for large electrolytic output capacitors-reducing solution size by >50% vs. 550 kHz alternatives. |
| Internal 150 mΩ PMOS switch (LLP-6) | Delivers 1.5A output with <200 mW conduction loss at 1.5A/3.3V, supporting high power density without external MOSFETs. |
| 0.6V ±2% internal reference | Ensures accurate low-voltage regulation (e.g., 1.2V @ ±1.5%) without trimming, critical for processor core and memory I/O supplies. |
| Internal soft-start (~600 µs) | Prevents inrush current into output capacitors during startup, eliminating need for external soft-start circuitry or sequencing controllers. |
| 30 nA shutdown current | Extends battery life in always-on USB peripherals and portable storage-enabling >1-year shelf life on coin-cell backup. |
Applications
| USB-Powered Devices | HDD Core Power |
|---|---|
|
Use Scenario: Powering FPGA I/O banks and microcontroller peripherals from a single 5V USB port. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V USB to 1.8V/3.3V rail with fast load transient response. Use Value: 3.0 MHz switching minimizes inductor size (<2 mm² footprint) and supports seamless hot-plug operation without brownout. |
Use Scenario: Supplying 1.2V core voltage to HDD controller ASICs in slim-form-factor drives. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1.5A at 1.2V with tight output regulation under dynamic disk spin-up loads. Use Value: Internal current-mode control maintains ±1.5% output accuracy across −40°C to +125°C junction range, ensuring ASIC reliability. |
| Set-Top Box SoC Supplies | DSL Modem PHY Power |
|
Use Scenario: Generating 1.0V and 1.2V rails for video processing SoCs in energy-efficient STBs. IC Role / Device Role / Timing Role: Local point-of-load regulator with integrated OVP and thermal shutdown for safety-critical video subsystems. Use Value: 15% overvoltage protection triggers immediate switch disable, preventing damage to sensitive SoC I/O structures during feedback fault. |
Use Scenario: Powering DSL line driver and analog front-end (AFE) circuits requiring low-noise 3.3V supply. IC Role / Device Role / Timing Role: Low-EMI buck regulator with separate VIND/VINA pins to isolate noisy power path from precision analog biasing. Use Value: Separated input pins reduce coupling of switching noise into AFE reference paths, improving SNR by >3 dB in line diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2831YSD | Fixed 0.55 MHz switching frequency; 130 mΩ RDS(ON) (SOT23-5) vs. 150 mΩ (LLP-6); lower quiescent current (2.8–4.5 mA). | Better efficiency at light loads; requires larger inductor (≥4.7 µH) and more PCB area; unsuitable for ultra-thin USB devices. | Select LM2831YSD only when board space allows larger magnetics and thermal budget permits higher θJA (118°C/W in SOT23-5). |
| TPS62231DRVR | 3.0 MHz synchronous buck; 1.8A output; 0.6V reference; 17 µA IQ in PFM mode; no external diode required. | Higher integration (integrated high-side/low-side FETs), smaller solution size, but lacks OVP and thermal shutdown latch. | Choose TPS62231DRVR for battery-powered designs needing lowest IQ and smallest total BOM count; LM2831ZSD preferred where robust fault protection is mandatory. |
Compared with LM2831YSD, LM2831ZSD trades slightly higher active IQ for 5.5× faster switching and superior thermal performance in LLP-6; versus TPS62231DRVR, it offers built-in OVP and thermal shutdown at the cost of external diode requirement and marginally larger footprint.
Availability
LM2831ZSD is available at Aetrix Electronics and suitable for USB-powered devices, HDD core supplies, set-top box SoC rails, and DSL modem PHY power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2831ZSD 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 LM2831 family was designed specifically for space-constrained, high-frequency point-of-load applications in consumer and computing electronics, emphasizing minimal external components, fast transient response, and robust protection features.
FAQ
What is the switching frequency of the LM2831ZSD?
The LM2831ZSD has a factory-trimmed fixed switching frequency of 3.0 MHz, with guaranteed range of 2.25 MHz to 3.75 MHz over temperature and input voltage. This high frequency allows use of sub-2 µH inductors and small ceramic capacitors, significantly reducing solution footprint compared to lower-frequency buck regulators like the LM2831YSD (0.55 MHz).
Does the LM2831ZSD require an external catch diode?
Yes, the LM2831ZSD requires an external Schottky catch diode connected between SW and GND. It uses a P-channel MOSFET high-side switch and cannot integrate synchronous rectification. A low-VF Schottky diode (e.g., 0.3–0.45 V forward drop) rated for ≥1.5A is recommended to maintain >90% efficiency at full load.
What is the maximum output current capability of the LM2831ZSD?
The LM2831ZSD delivers up to 1.5A continuous output current under typical conditions (TJ ≤ 125°C, 5V input, 3.3V output). Its current limit is typ. 2.5A with minimum guarantee of 1.8A across temperature and process variation. Actual achievable current depends on thermal design-LLP-6 package with proper DAP grounding supports full 1.5A in ambient ≤65°C.
How does the LM2831ZSD handle thermal overload?
The LM2831ZSD incorporates thermal shutdown that disables the internal PMOS switch when junction temperature exceeds 165°C. After shutdown, the device remains off until junction temperature falls to ~150°C due to built-in hysteresis. This protects against sustained overtemperature events without requiring external thermal monitoring circuitry.
Can the LM2831ZSD operate with a 3.3V input supply?
Yes, the LM2831ZSD supports input voltages from 3.0V to 5.5V, making it fully compatible with 3.3V rails. At 3.3V input, it can regulate outputs as low as 0.6V (e.g., 1.2V at 50% duty cycle) with stable current-mode control. Efficiency remains >85% at 1.5A/1.2V output, validated in TI's typical performance curves (Figure 20174842).
LM2831ZSD 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)
LM2831ZSD FAQ
1.How can I place an order for LM2831ZSD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZSD 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 LM2831ZSD reliable?
The price and inventory of LM2831ZSD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZSD is usually 5 days.
3.What payment methods are accepted for LM2831ZSD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZSD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZSD?
LM2831ZSD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZSD 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 LM2831ZSD?
For technical support, including LM2831ZSD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZSD requirements.
6.How does Aetrix verify that LM2831ZSD is sourced from the original manufacturer or authorized distributors?
All LM2831ZSD 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 LM2831ZSD meets industry standards.
7.What is the process for return or replacement of LM2831ZSD?
All LM2831ZSD units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZSD, 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 LM2831ZSD part is unused and in its original packaging.
Return procedure for LM2831ZSD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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