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Texas Instruments LM2731XMF/NOPB
- Part No.:
- LM2731XMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2731XMF/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.8A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:15,576
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Product details
Overview
LM2731XMF/NOPB from Texas Instruments is a fixed-frequency 1.6-MHz current-mode boost converter IC with integrated 22-V, 1.8-A DMOS FET switch, 1.23-V feedback reference, and logic-level shutdown control - designed for compact, high-efficiency DC-DC voltage boosting in portable power rails up to 20 V.
For engineers reviewing the LM2731XMF/NOPB datasheet, LM2731XMF/NOPB pinout, LM2731XMF/NOPB application, or LM2731XMF/NOPB equivalent, key selection criteria include switching frequency stability across temperature, RDS(ON) performance at 300 mΩ (typ), thermal derating behavior (RθJA = 209.9°C/W), and compatibility with ceramic input/output capacitors and Schottky diodes in SOT-23 space-constrained designs.
Technical Context
The LM2731XMF/NOPB implements peak-current-mode control using an internal ramp generator and PWM comparator, where the switch current is sensed via the FET's intrinsic RDS(ON) (no external sense resistor required). Its 1.23-V precision bandgap reference sets output voltage via external resistive divider on the FB pin.
It features cycle-by-cycle overcurrent protection triggered by internal current limit amplifier, thermal shutdown at ~160°C junction temperature, and active-low SHDN pin with <1 µA shutdown current - enabling battery-sensitive applications requiring fast enable/disable transitions and low quiescent power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz (fixed, X-option) - enables use of ≤10-µH inductors and sub-10-µF ceramic capacitors for ultra-compact layouts. |
| Internal Switch Rating | 22-V drain-source breakdown, 1.8-A peak current - supports output voltages up to 20 V from 2.7–14-V inputs. |
| Feedback Reference Voltage | 1.230 V (±25 mV over –40°C to 125°C) - defines output regulation accuracy and sets minimum practical output voltage at ~1.25 V. |
| RDS(ON) | 300 mΩ (typ at TJ = 25°C) - directly determines conduction loss and thermal rise under load; impacts efficiency above 100 mA. |
| Shutdown Current | <1 µA - extends battery life in standby mode; SHDN pin must be tied to VIN if unused to avoid floating state. |
| Input Voltage Range | 2.7 V to 14 V - accommodates single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.7–3.6 V), and 12-V rail boosting. |
| Junction-to-Ambient RθJA | 209.9°C/W (SOT-23-5) - limits continuous power dissipation to ~350 mW at 25°C ambient before thermal shutdown. |
Pinout & Package
LM2731XMF/NOPB is housed in a 5-pin SOT-23 package (1.60 mm × 2.90 mm body size) with exposed pad not electrically connected. Thermal performance relies on PCB copper area under the package per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Drain Node | Connects to inductor and Schottky diode anode; carries high dv/dt switching waveform - requires tight layout and ground return path. |
| GND (Pin 2) | Analog & Power Ground | Common reference for FB, SHDN, and internal circuitry; must be low-impedance connection to minimize noise coupling into feedback loop. |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistive divider; high-impedance node (500 nA bias) - sensitive to leakage and noise; keep trace short and away from SW. |
| SHDN (Pin 4) | Active-Low Enable Control | Pulled low to disable regulator; draws <2 µA when active; must not float - tie to VIN if unused or use 50–100 kΩ pullup. |
| VIN (Pin 5) | Power Input | Supplies internal circuitry and switch driver; requires local 2.2-µF ceramic capacitor placed within 3 mm of pin to suppress input ripple and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network except mandatory feedforward capacitor (CF ≈ 220 pF) - reduces BOM count and layout sensitivity. |
| Cycle-by-cycle current limiting | Protects internal FET during overload or short-circuit transients without latch-up; resets each switching cycle - maintains regulation during moderate overloads. |
| Low RDS(ON) DMOS switch | 300 mΩ typical conduction resistance minimizes I²R losses at 1.8-A peak, enabling >85% efficiency at 300 mA output in 5 V → 12 V boost. |
| Logic-level shutdown interface | Compatible with 1.8-V, 3.3-V, and 5-V microcontroller GPIOs; <1 µA shutdown current extends battery runtime in sleep modes. |
| Thermal shutdown protection | Activates at ~160°C junction temperature and releases at ~150°C - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| White LED Backlighting | Portable Audio Power Rail |
|---|---|
Use Scenario: Driving 3–6串联 white LEDs (9–18 V forward) from a single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Boost converter providing constant-current source via external current-sense resistor and FB voltage regulation. Use Value: Delivers stable LED brightness across battery discharge curve with >86% efficiency at 200 mA output and minimal component count (1 inductor, 1 diode, 2 caps, 2 resistors). |
Use Scenario: Generating clean 5-V or 9-V supply for audio codecs, DACs, or Class-D amplifiers in Bluetooth speakers or wearables. IC Role / Device Role / Timing Role: Primary DC-DC step-up regulator powering analog signal chain; operates at 1.6 MHz to avoid AM radio band interference. Use Value: Enables use of tiny 10-µH shielded inductors and 4.7-µF X7R ceramics - reducing solution footprint to <25 mm² while maintaining <15 mVPP output ripple. |
| Digital Camera Flash Charging | Industrial Sensor Local Boost |
Use Scenario: Charging high-voltage capacitor (≥200 V) for xenon flash via charge-pump cascade starting from 3.3-V system rail. IC Role / Device Role / Timing Role: First-stage boost converter delivering regulated 12–15 V to subsequent flyback or charge-pump stages. Use Value: 22-V switch rating and 1.6-MHz operation allow rapid capacitor charging with minimal inductor size; shutdown pin enables precise timing control of flash sequence. |
Use Scenario: Providing isolated 12-V or 15-V bias for industrial RS-485 transceivers, analog front-ends, or MEMS sensors operating from 3.3-V or 5-V microcontroller rails. IC Role / Device Role / Timing Role: Local point-of-load boost regulator ensuring stable supply despite varying main rail loading or long PCB traces. Use Value: High PSRR at 1.6 MHz and low output impedance (<100 mΩ) suppress noise coupling into sensitive analog measurements; thermal shutdown ensures reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Fixed 600-kHz switching frequency; lower 0.5-A switch current limit; 28-V switch rating. | Better suited for higher-output-voltage (>20 V), lower-current applications; less efficient at >300 mA due to lower peak current. | Select when output voltage exceeds 20 V or thermal budget is extremely constrained - uses smaller inductor but sacrifices peak power capability. |
| MAX1706YETA+ | 1.2-MHz switching; integrated Schottky diode; 1.3-A switch current; no SHDN pin. | Reduces component count (no external diode) but lacks enable control; limited to ≤16-V output due to 17-V switch rating. | Choose for simplified BOM in cost-sensitive, non-shutdown applications - tradeoff is reduced max output voltage and no logic-level control. |
Compared with TPS61040DRVR and MAX1706YETA+, the LM2731XMF/NOPB delivers higher peak current (1.8 A vs ≤1.3 A) and wider output voltage range (up to 20 V vs ≤16 V or ≥20 V only), making it optimal for medium-power portable boost where dynamic load response and compact magnetics are critical.
Availability
LM2731XMF/NOPB is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and IoT edge nodes requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for LM2731XMF/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2731 family was engineered for space-constrained portable electronics needing efficient, integrated boost conversion - emphasizing minimal external components, robust thermal behavior, and seamless integration with Li-ion and multi-cell battery systems.
FAQ
What is the maximum output voltage achievable with the LM2731XMF/NOPB?
The LM2731XMF/NOPB supports output voltages up to 20 V, limited by its 22-V internal DMOS FET breakdown rating and safe operating area. Output voltage is set externally via the FB resistive divider, and operation above 20 V risks FET avalanche failure. For 12-V outputs, typical design uses R1 = 117 kΩ and R2 = 13.3 kΩ with 1.23-V reference.
Does the LM2731XMF/NOPB require an external compensation network?
The LM2731XMF/NOPB features internal compensation, eliminating the need for traditional Type-II/III networks. However, a feedforward capacitor (CF = 220 pF) between FB and VIN is mandatory for loop stability - its zero at ~6 kHz counteracts phase lag from the output filter. Omitting CF causes oscillation or poor transient response.
Can the LM2731XMF/NOPB operate from a 1.8-V input?
No - the LM2731XMF/NOPB has a minimum input voltage of 2.7 V per its Recommended Operating Conditions. Below 2.7 V, internal biasing fails, UVLO activates, and regulation ceases. For 1.8-V input applications, consider TI's TPS61200 or Analog Devices' ADP161x, which support down to 1.8 V with appropriate topology tradeoffs.
What is the purpose of the SHDN pin on the LM2731XMF/NOPB, and how should it be used?
The SHDN pin on the LM2731XMF/NOPB is an active-low enable control that reduces quiescent current to <1 µA when pulled below 0.5 V. If unused, it must be tied directly to VIN - floating or open-circuit conditions cause erratic startup or latch-up. For microcontroller interfacing, a 50–100 kΩ pullup to VIN ensures reliable logic-high default state.
How does thermal performance of the LM2731XMF/NOPB compare between the X and Y variants?
Thermal performance is identical between LM2731XMF/NOPB (1.6 MHz) and LM2731YMF/NOPB (600 kHz) - both share the same SOT-23-5 package, RθJA = 209.9°C/W, and thermal shutdown threshold (~160°C). However, the X variant incurs higher switching losses, raising junction temperature at equal load - e.g., at 300 mA output, ΔTJ is ~15°C higher than the Y variant under identical PCB layout.
LM2731XMF/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-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 22V (Switch)
- Current - Output:
- 1.8A (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2731XMF/NOPB FAQ
1.How can I place an order for LM2731XMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2731XMF/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 LM2731XMF/NOPB reliable?
The price and inventory of LM2731XMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2731XMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2731XMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2731XMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2731XMF/NOPB?
LM2731XMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2731XMF/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 LM2731XMF/NOPB?
For technical support, including LM2731XMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2731XMF/NOPB requirements.
6.How does Aetrix verify that LM2731XMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2731XMF/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 LM2731XMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2731XMF/NOPB?
All LM2731XMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2731XMF/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 LM2731XMF/NOPB part is unused and in its original packaging.
Return procedure for LM2731XMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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