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Texas Instruments LM2831ZMF/NOPB
- Part No.:
- LM2831ZMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2831ZMF/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,632
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Product details
Overview
LM2831ZMF/NOPB from Texas Instruments is a high-frequency, current-mode PWM step-down DC-DC regulator IC in a 5-pin SOT-23 package, delivering up to 1.5 A output current with 3 MHz switching frequency, 0.6 V internal reference (±2%), and 130 mΩ PMOS switch. It operates from 3 V to 5.5 V input and supports adjustable output voltages down to 0.6 V, commonly used in USB-powered devices and compact core power supplies.
For engineers reviewing the LM2831ZMF/NOPB datasheet, LM2831ZMF/NOPB pinout, LM2831ZMF/NOPB application, or LM2831ZMF/NOPB equivalent, key selection criteria include confirmed 3 MHz fixed-frequency operation, thermal shutdown at 165°C, 30 nA shutdown current, 2.73 V enable threshold, and compatibility with ceramic output capacitors for space-constrained designs.
Technical Context
The LM2831ZMF/NOPB implements constant-frequency current-mode control with an internal 0.6 V reference, artificial ramp compensation, and cycle-by-cycle current limiting. Its 3 MHz oscillator enables sub-millimeter inductor sizing and eliminates need for external compensation components.
It integrates undervoltage lockout (2.73 V turn-on, 2.3 V turn-off with 430 mV hysteresis), internal soft-start (~600 µs ramp), overvoltage protection (15% above VREF), and thermal shutdown (165°C trip, ~150°C recovery). The PMOS switch features 130 mΩ typical RDS(ON) at 25°C and 195 mΩ max over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (fixed, ±25% over –40°C to 125°C) - enables use of ≤3.3 µH inductors and 22 µF ceramic output caps in <10 mm² layout |
| Output Current | 1.5 A continuous - supported by internal 130 mΩ PMOS switch and 2.5 A typical current limit |
| Input Voltage Range | 3 V to 5.5 V - matches USB 5 V and single-cell Li-ion battery systems |
| Feedback Reference | 0.6 V ±2% - sets minimum output voltage; enables 0.6 V to 4.5 V programmable range via resistor divider |
| Quiescent Current | 4.3 mA (typical, switching mode) / 30 nA (shutdown) - ensures low standby power in portable applications |
| Thermal Shutdown | 165°C junction trip - protects against sustained overload or poor PCB thermal design |
| Enable Threshold | 2.73 V (typical turn-on), 2.3 V (turn-off) - provides clean start-up with 430 mV hysteresis |
Pinout & Package
LM2831ZMF/NOPB uses the 5-pin SOT-23 (DBV) package (1.60 mm × 2.90 mm body), optimized for low-profile, high-density DC-DC conversion. Thermal performance relies on proper GND pad soldering and minimal trace inductance on VIN/SW paths.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 3–5.5 V; requires local 22 µF ceramic bypass capacitor placed within 3 mm of pin |
| SW | Switch node output | Drives external inductor and catch diode; high dv/dt node requiring tight loop area and ground plane underneath |
| EN | Enable control input | Logic-high active; 2.73 V threshold; must be tied to VIN or controlled logic-never left floating |
| FB | Feedback input | Senses output voltage via resistor divider; 0.1 nA bias current allows high-value resistors (e.g., 15 kΩ/15 kΩ for 1.2 V) |
| GND | Signal and power ground | Primary return path; feedback bottom resistor must connect directly here to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3 MHz switching | Enables ultra-compact designs: 3.3 µH inductor + 2×22 µF X5R ceramics fit in <100 mm² total area |
| Internal 0.6 V reference | ±2% accuracy over –40°C to 125°C ensures stable output regulation without external precision references |
| 130 mΩ PMOS switch | Delivers >90% efficiency at 1.5 A/3.3 V out from 5 V in, reducing thermal load vs. discrete FET solutions |
| Integrated soft-start | ~600 µs output ramp prevents inrush current into large output capacitors and downstream circuitry |
| Overvoltage protection | Shuts off switch if FB exceeds 15% above 0.6 V (i.e., >0.69 V), protecting load during feedback fault or divider open |
Applications
| USB-Powered Devices | Core Power in HDDs |
|---|---|
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals from a 5 V USB port with strict size constraints. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V USB to 3.3 V or 1.8 V at up to 1.5 A. Use Value: 3 MHz operation allows full regulation with only 3.3 µH inductor and 44 µF total ceramic output capacitance, eliminating bulkier tantalum or electrolytic caps. |
Use Scenario: Supplying 1.2 V core voltage to HDD controller ASICs where transient response and board space are critical. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast current-mode control for dynamic load steps up to 1 A/µs. Use Value: Cycle-by-cycle current limiting (2.5 A typ.) and 30 ns minimum on-time support stable 1.2 V @ 1.5 A delivery under rapid load transients. |
| DSL Modems | Set-Top Boxes |
Use Scenario: Generating 3.3 V system rail from 5 V adapter in thermally constrained DSL modem enclosures. IC Role / Device Role / Timing Role: High-efficiency buck converter operating continuously at ambient up to 70°C. Use Value: 90%+ efficiency at 1.5 A and RθJA = 163.4°C/W enable operation without heatsink in sealed plastic housing. |
Use Scenario: Providing 1.5 V memory interface supply in multi-rail STB power architecture with EMI sensitivity. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency regulator minimizing beat frequencies with other system clocks. Use Value: 3 MHz fundamental frequency places switching energy beyond 30 MHz, easing FCC Class B conducted emissions filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2831XMF/NOPB | 1.6 MHz switching frequency, same package and pinout | Lower switching loss at medium loads; requires larger inductor (≥4.7 µH) and higher output capacitance for equivalent ripple | Select when optimizing for peak efficiency >85% at 0.5–1.0 A rather than minimal footprint |
| TPS62231DRVR | 2.25 MHz, 1.8 V to 6.5 V input, 0.6 V reference, 1.2 A max output | Lower max current, wider input range, integrated synchronous rectification (no external diode needed) | Prefer for new designs needing synchronous operation and input flexibility, accepting 1.2 A limit and different pinout |
Compared with LM2831XMF/NOPB and TPS62231DRVR, the LM2831ZMF/NOPB delivers highest power density via its 3 MHz operation but requires an external Schottky catch diode and has stricter input voltage上限 (5.5 V), making it optimal for compact 5 V–derived rails where size dominates efficiency trade-offs.
Availability
LM2831ZMF/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, HDD core power supplies, DSL modems, and set-top boxes requiring stable component supply across production lifecycles.
Supply support for LM2831ZMF/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.
The LM2831 family was designed specifically for space-constrained, high-frequency DC-DC conversion in portable and networked electronics, emphasizing minimal external components and robust protection features.
FAQ
What is the confirmed switching frequency of LM2831ZMF/NOPB?
The LM2831ZMF/NOPB has a factory-trimmed fixed switching frequency of 3 MHz, with typical variation of ±25% across –40°C to 125°C junction temperature. This is verified in Section 6.5 Electrical Characteristics of the SNVS422D datasheet, where FSW = 3 MHz (typ) is explicitly specified for the Z variant under all operating conditions.
Does LM2831ZMF/NOPB require an external catch diode?
Yes, LM2831ZMF/NOPB requires an external Schottky catch diode (e.g., Toshiba CRS08) connected between SW and GND. Unlike synchronous buck regulators, it uses an internal PMOS high-side switch only and relies on the external diode for low-side conduction during off-time, as shown in the Typical Application Circuit (Figure 19) and confirmed in Section 8.2.1.2.4.
What is the maximum output voltage achievable with LM2831ZMF/NOPB?
The LM2831ZMF/NOPB supports output voltages up to 4.5 V, as stated in the Features section of the datasheet. This is achieved using a resistor divider from VOUT to FB and from FB to GND, where VOUT = 0.6 V × (1 + R1/R2). The upper limit is constrained by the absolute maximum SW pin voltage rating of 7 V and practical stability limits of the control loop.
How does the enable function operate on LM2831ZMF/NOPB?
The EN pin on LM2831ZMF/NOPB is logic-high active with a typical turn-on threshold of 2.73 V and turn-off threshold of 2.3 V, providing 430 mV hysteresis. When pulled below 0.4 V, the device enters shutdown with 30 nA quiescent current. The pin must never be left floating and must not exceed VIN + 0.3 V, per Pin Functions table (Section 5).
Is LM2831ZMF/NOPB RoHS-compliant and lead-free?
Yes, LM2831ZMF/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's standard designation for lead-free, RoHS-compliant packaging) and confirmed in TI's official product folder and orderable addendum for SNVS422D.
LM2831ZMF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2831ZMF/NOPB FAQ
1.How can I place an order for LM2831ZMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZMF/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 LM2831ZMF/NOPB reliable?
The price and inventory of LM2831ZMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831ZMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZMF/NOPB?
LM2831ZMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZMF/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 LM2831ZMF/NOPB?
For technical support, including LM2831ZMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZMF/NOPB requirements.
6.How does Aetrix verify that LM2831ZMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831ZMF/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 LM2831ZMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831ZMF/NOPB?
All LM2831ZMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZMF/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 LM2831ZMF/NOPB part is unused and in its original packaging.
Return procedure for LM2831ZMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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