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Texas Instruments LM2831ZMF
- Part No.:
- LM2831ZMF
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2831ZMF.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
LM2831ZMF from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in a 5-pin SOT-23 package, delivering up to 1.5A output current with an internal 130 mΩ PMOS switch. It operates from 3.0V to 5.5V input, regulates output down to 0.6V with ±2% reference accuracy, and switches at a fixed 3.0 MHz frequency-enabling compact designs for USB-powered devices and core power in space-constrained HDDs.
For engineers reviewing the LM2831ZMF datasheet, LM2831ZMF pinout, LM2831ZMF application, or LM2831ZMF equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency data (up to 93%), thermal shutdown behavior, and validated alternative options for 3 MHz buck conversion in portable and embedded systems.
Technical Context
The LM2831ZMF uses current-mode PWM control with internal compensation and a fixed 3.0 MHz switching frequency-supporting ultra-low minimum on-times (~30 ns) across its full 3V–5.5V input range. Its architecture integrates a 130 mΩ PMOS switch, 0.6 V ±2% internal reference, and pulse-by-pulse current limiting to ensure stable regulation under fast load transients.
It features internal soft-start (600 µs ramp), undervoltage lockout (2.73 V rising threshold, 430 mV hysteresis), output overvoltage protection (15% above VREF), and thermal shutdown at 165°C. Quiescent current is 4.3–6.5 mA during operation and drops to 30 nA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3.0 MHz - enables use of sub-2 µH inductors and small ceramic capacitors, minimizing PCB area. |
| Input Voltage Range | 3.0 V to 5.5 V - matches standard USB 5V and single-cell Li-ion battery rails. |
| Output Voltage Range | 0.6 V to 4.5 V - set via external resistor divider; 0.6 V reference supports modern low-voltage cores. |
| Max Output Current | 1.5 A - sustained delivery enabled by 130 mΩ internal PMOS switch in SOT23-5 package. |
| Feedback Reference | 0.600 V ±2% - high-accuracy bandgap reference ensures tight output regulation across temperature. |
| Quiescent Current | 4.3–6.5 mA (active), 30 nA (shutdown) - critical for battery life in always-on USB peripherals. |
| Thermal Shutdown | 165°C activation, ~150°C recovery - protects against sustained overload or poor heatsinking. |
Pinout & Package
LM2831ZMF is housed in a 5-pin SOT-23 package (NSC drawing MF05A, top mark SLAB), optimized for minimal footprint and thermal performance on 2-layer PCBs. The exposed pad variant is not used in this SOT-23 configuration.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node | Connects to inductor and catch diode cathode; carries high di/dt switching current - requires short, wide trace routing. |
| 2 (GND) | Signal and power ground | Reference for feedback network; must be placed adjacent to bottom resistor of FB divider to minimize noise coupling. |
| 3 (FB) | Feedback input | High-impedance node sensing output voltage via resistor divider; sensitive to noise - keep trace short and away from SW/VIN. |
| 4 (EN) | Enable control | Logic-high active; threshold 1.8 V; floating state disables device - requires pull-up or direct MCU GPIO control. |
| 5 (VIN) | Input supply | 3.0–5.5 V main power rail; requires local 22 µF ceramic input capacitor near pin to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 MHz fixed-frequency operation | Enables <2 µH inductors (e.g., TDK VLCF4018T-1R6N) and eliminates need for external frequency programming components. |
| 130 mΩ internal PMOS switch | Delivers 1.5 A continuous output in SOT-23-5 without external MOSFETs or gate drivers - reduces BOM count and layout complexity. |
| 0.6 V ±2% internal reference | Supports precise regulation of sub-1 V outputs (e.g., 0.6 V, 0.8 V, 1.2 V) required by modern microcontrollers and FPGAs. |
| Internal soft-start (600 µs) | Prevents inrush current into output capacitors during power-up - avoids tripping upstream current limits or causing bus droop. |
| Pulse-by-pulse current limit | Guarantees peak switch current stays ≤2.5 A (typ), protecting both IC and external components during short-circuit or overload events. |
Applications
| USB-Powered Portable Devices | HDD Core Power Supply |
|---|---|
|
Use Scenario: Powering FPGA I/O banks or microcontroller cores from a 5 V USB port in handheld test equipment. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V USB to 1.2 V/1.8 V with fast transient response to handle bursty logic loads. Use Value: 3.0 MHz switching allows tiny 1.6 µH inductor and 2×22 µF X5R MLCCs - fits within 80 mm² total solution area. |
Use Scenario: Generating 1.2 V core voltage for 2.5-inch HDD controller ASICs in consumer NAS enclosures. IC Role / Device Role / Timing Role: Local point-of-load regulator with tight output tolerance and thermal robustness in thermally dense drive bays. Use Value: 130 mΩ RDS(ON) and 93% peak efficiency minimize self-heating; thermal shutdown prevents failure during sustained 1.5 A operation. |
| Set-Top Box SoC Power | DSL Modem Baseband Processor |
|
Use Scenario: Supplying 0.8 V to ARM-based media processor cores in low-cost STBs with strict cost and size targets. IC Role / Device Role / Timing Role: High-density buck converter enabling single-layer routing on 2-layer PCBs with no external compensation. Use Value: Internal compensation and 3 MHz frequency eliminate loop stability tuning - accelerates design validation and reduces debug cycles. |
Use Scenario: Regulating 3.3 V for ADSL2+ line interface ICs and PHYs in compact wall-mount modems. IC Role / Device Role / Timing Role: Secondary regulator downstream of primary 5 V supply, supporting dynamic load steps during packet bursts. Use Value: Current-mode control provides inherent cycle-by-cycle current limiting and fast line/load transient response (<10 µs settling). |
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 synchronous buck, 0.6 V reference, 3 A output, 12 µA IQ (shutdown), WSON-10 package. | Higher current capability and lower quiescent current, but larger 3 mm × 3 mm package vs. SOT-23-5. | Choose when >1.5 A output or ultra-low shutdown IQ is required; not pin-compatible - board redesign needed. |
| MP2108DQ-LF-Z | 3 MHz synchronous buck, 0.6 V reference, 2 A output, 25 µA IQ (shutdown), QFN-10 package. | Includes integrated synchronous rectifier (no external diode), higher max current, but requires 10-pin layout. | Prefer for higher efficiency (>95%) and reduced BOM count where space permits QFN-10; not drop-in compatible with LM2831ZMF. |
Compared with TPS62130ARGTR and MP2108DQ-LF-Z, the LM2831ZMF offers the smallest PCB footprint (SOT-23-5), proven reliability in USB/HDD applications, and simpler external component requirements - making it optimal for cost-sensitive, space-constrained 1.5 A designs where synchronous rectification is not mandatory.
Availability
LM2831ZMF is available at Aetrix Electronics and suitable for USB-powered devices, HDD core power supplies, set-top box SoC rails, and DSL modem baseband processors requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM2831ZMF 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 and embedded processing technologies, with decades of expertise in power management ICs and high-reliability industrial solutions.
The LM2831 product line was designed specifically for compact, high-frequency DC-DC conversion in portable and embedded systems - emphasizing minimal external components, internal compensation, and robust protection features for unattended operation.
FAQ
What is the switching frequency of the LM2831ZMF?
The LM2831ZMF has a fixed internal switching frequency of 3.0 MHz, with typical variation of ±25% (2.25–3.75 MHz) over temperature and input voltage. This high frequency enables use of very small inductors (e.g., 1.6 µH) and ceramic capacitors while maintaining excellent transient response - confirmed in TI's Typical Performance Characteristics (Figure 20174836).
Does the LM2831ZMF require external compensation components?
No, the LM2831ZMF uses internal compensation and is fully stable with only five external components: input capacitor, output capacitor, catch diode, inductor, and FB divider resistors. This eliminates the need for external compensation networks - a key design simplification validated across all operating conditions in the Applications Information section.
What is the maximum output current capability of the LM2831ZMF?
The LM2831ZMF delivers up to 1.5 A continuous output current when properly heatsunk on a 2-layer PCB with 2 oz copper. Its 130 mΩ internal PMOS switch and thermal shutdown at 165°C enable this rating in the SOT-23-5 package - verified in Electrical Characteristics (ICL = 1.8–2.5 A min/typ) and Design Example 6 (1.5 A at 3.3 V out).
Can the LM2831ZMF operate from a 3.3 V input to generate 1.2 V output?
Yes, the LM2831ZMF supports input voltages from 3.0 V to 5.5 V and output voltages from 0.6 V to 4.5 V. At VIN = 3.3 V and VOUT = 1.2 V, the duty cycle is ~36%, well within the 7–90% range specified for the Z-version - confirmed in Load Regulation curves (Figure 20174844) and Design Example 5 (LM2831Y, same topology).
What protection features does the LM2831ZMF include?
The LM2831ZMF integrates pulse-by-pulse current limiting (2.5 A typ), thermal shutdown (165°C), output overvoltage protection (15% above 0.6 V reference), undervoltage lockout (2.73 V rising, 430 mV hysteresis), and internal soft-start (600 µs). All are documented in the Applications Information section and validated in Absolute Maximum Ratings and Electrical Characteristics tables.
LM2831ZMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
LM2831ZMF FAQ
1.How can I place an order for LM2831ZMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZMF 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 LM2831ZMF reliable?
The price and inventory of LM2831ZMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZMF is usually 5 days.
3.What payment methods are accepted for LM2831ZMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZMF?
LM2831ZMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZMF 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 LM2831ZMF?
For technical support, including LM2831ZMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZMF requirements.
6.How does Aetrix verify that LM2831ZMF is sourced from the original manufacturer or authorized distributors?
All LM2831ZMF 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 LM2831ZMF meets industry standards.
7.What is the process for return or replacement of LM2831ZMF?
All LM2831ZMF units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZMF, 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 LM2831ZMF part is unused and in its original packaging.
Return procedure for LM2831ZMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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