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Texas Instruments LM2731XMF
- Part No.:
- LM2731XMF
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2731XMF.pdf
- Description:
- IC REG BOOST ADJ 1.8A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
LM2731XMF from Texas Instruments is a fixed-frequency current-mode boost converter IC with an integrated 22-V, 1.8-A DMOS FET switch, operating at 1.6 MHz switching frequency, supporting input voltages from 2.7 V to 14 V and output voltages up to 20 V - used in portable power rails for white LED drivers and PDA local boost supplies.
For engineers reviewing the LM2731XMF datasheet, LM2731XMF pinout, LM2731XMF application, or LM2731XMF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain-ready availability details - all grounded in TI's SNVS217G datasheet (Rev G, Sep 2015).
Technical Context
The LM2731XMF uses peak-current-mode control with internal ramp compensation, where the switch current is sensed via the FET's RDS(ON) and compared cycle-by-cycle against a threshold to enforce 1.8-A peak limit. Its 1.6-MHz oscillator enables compact magnetics and fast transient response across 2.7–14-V input range.
Feedback regulation relies on a precision 1.23-V reference applied to the FB pin, with output voltage set by an external resistive divider; shutdown is active-low and requires tie-to-VIN if unused. Thermal shutdown activates at ~160°C junction temperature and recovers near 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz nominal - enables use of ≤10-µH inductors and sub-10-µF ceramic capacitors for high power density. |
| Input Voltage Range | 2.7 V to 14 V - supports single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.7–3.6 V), and 12-V rail boosting. |
| Internal Switch Rating | 22-V VDS, 1.8-A peak current - allows regulated outputs up to 20 V with margin for diode drop and ripple. |
| RDS(ON) | Typ. 300 mΩ at TJ = 25°C - limits conduction loss to <150 mW at 1-A load, critical for efficiency above 85%. |
| Feedback Reference | 1.230 V ±25 mV (–40°C to 125°C) - sets output accuracy; e.g., 12-V output requires R1/R2 ratio tolerance ≤0.5% for ±1% VOUT. |
| Shutdown Current | <1 µA - extends battery life in standby; SHDN pin must be tied to VIN if unused to avoid floating state. |
| Thermal Resistance | RθJA = 209.9°C/W (SOT-23) - limits max continuous power dissipation to ~350 mW at 25°C ambient before thermal foldback. |
Pinout & Package
LM2731XMF is housed in a 5-pin SOT-23 package (1.60 mm × 2.90 mm body), optimized for low-profile portable designs and thermally enhanced PCB layout with exposed pad grounding (per TI DBV mechanical drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Drain Node | Connects to inductor and Schottky diode anode; carries high di/dt pulsed current - requires short, wide trace and ground plane return. |
| GND (Pin 2) | Analog & Power Ground | Single-point connection for FB, SHDN, and VIN return; separates noisy switch node from sensitive feedback path. |
| FB (Pin 3) | Feedback Input | High-impedance (50–500 nA bias) node sensing output divider - routed away from SW and inductor to avoid noise coupling. |
| SHDN (Pin 4) | Active-Low Enable | Pulled low to disable regulator; must not float - tie directly to VIN if unused, or use 50–100 kΩ pullup for controlled sequencing. |
| VIN (Pin 5) | Power Input | Accepts 2.7–14 V; requires local 2.2-µF ceramic capacitor placed within 3 mm of pin to suppress high-frequency input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - only feedforward capacitor (CF ≈ 220 pF) required for stability at 1.6 MHz. |
| Cycle-by-cycle current limiting | Hardware-enforced 1.8-A peak switch current prevents FET destruction during overload or short-circuit on output side. |
| Low quiescent current (1.2 mA active) | Enables >100-hour runtime in 100-mA portable systems; reduces heat rise in sealed enclosures. |
| Thermal shutdown with hysteresis | Shuts down at ~160°C junction temp and resumes at ~150°C - protects against sustained overloads without latch-up. |
| Logic-level shutdown interface | Compatible with 1.8-V, 3.3-V, and 5-V microcontrollers - no level-shifting needed for enable/disable control. |
Applications
| White LED Backlighting | PDA/Handheld Power Rails |
|---|---|
Use Scenario: Driving 3–6串联 white LEDs (9–18 V total VF) from a 3.3-V or 3.7-V Li-ion cell in handheld displays. IC Role / Device Role / Timing Role: Boost converter providing constant-current source via external sense resistor and feedback regulation. Use Value: 1.6-MHz operation minimizes inductor size (<2.5 mm height) while maintaining >85% efficiency at 150-mA LED current. |
Use Scenario: Generating stable 5-V or 12-V local supply from a 3.3-V system rail in PDAs or industrial handhelds. IC Role / Device Role / Timing Role: Compact DC-DC step-up regulator powering USB peripherals, SD card interfaces, or display drivers. Use Value: SOT-23 footprint saves board space; 22-V switch supports 12-V output with headroom for line transients and diode drop. |
| Digital Camera Flash Charging | Portable Audio Amplifier Supply |
Use Scenario: Charging a 100–220-µF electrolytic capacitor to 300–330 V for xenon flash discharge in compact cameras. IC Role / Device Role / Timing Role: High-voltage boost stage feeding charge pump or flyback driver; operates in discontinuous mode during charging bursts. Use Value: 1.8-A peak switch current enables rapid capacitor charging in <500 ms; thermal shutdown prevents damage during repeated bursts. |
Use Scenario: Generating 5–9 V for Class D audio amplifiers in Bluetooth speakers or portable headphones from a single Li-ion cell. IC Role / Device Role / Timing Role: Efficient mid-rail boost supply delivering 500–800 mA with low output ripple to minimize audible noise. Use Value: Low RDS(ON) (300 mΩ) and 1.6-MHz switching reduce output ripple to <20 mVpp with 4.7-µF ceramic output cap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2731YMF | 600-kHz switching frequency, lower quiescent current (1 mA), higher max duty cycle (93% vs 88% at 125°C) | Better efficiency at medium loads (>200 mA); larger inductors required - less suitable for ultra-compact layouts | Select LM2731YMF when board space permits larger magnetics and priority is peak efficiency over size. |
| TPS61040DBVR | Fixed 500-kHz frequency, 28-V switch, 0.5-A switch current limit, integrated soft-start, smaller 5-pin SOT-23-5 package | Limited to ≤15-V output and ≤400-mA load; lacks thermal shutdown and cycle-by-cycle current limit | Choose TPS61040DBVR only for low-power, cost-sensitive designs where full protection features are not required. |
Compared with LM2731XMF, LM2731YMF trades switching speed for efficiency and thermal margin, while TPS61040DBVR offers integration at the expense of robustness - making LM2731XMF the optimal choice for space-constrained, high-output-voltage, and reliability-critical boost applications.
Availability
LM2731XMF is available at Aetrix Electronics and suitable for white LED backlighting, PDA power rails, digital camera flash charging, and portable audio amplifier supply requiring stable component supply across production lifecycles.
Supply support for LM2731XMF 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 designing analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2731XMF belongs to TI's high-frequency boost converter product line, engineered specifically for compact, battery-powered systems needing efficient, integrated 1.6-MHz step-up conversion with minimal external components.
FAQ
What is the maximum output voltage achievable with the LM2731XMF?
The LM2731XMF supports output voltages up to 20 V, constrained by its 22-V internal DMOS FET's breakdown rating and typical Schottky diode forward drop (0.4–0.5 V). At 12-V output, the device maintains >85% efficiency with 5-V input and 150-mA load per TI SNVS217G Figure 15. Exceeding 20 V risks FET avalanche and permanent damage.
Does the LM2731XMF require external compensation components?
The LM2731XMF is internally compensated but requires a feedforward capacitor (CF = 220 pF) between FB and VIN for loop stability at 1.6 MHz, as specified in TI SNVS217G Section 8.2.2.4. Omitting CF causes oscillation and output voltage instability - no additional poles or zeros are needed.
Can the LM2731XMF drive a 12-V, 500-mA load from a 3.3-V input?
No - the LM2731XMF's 1.8-A peak switch current and 88% max duty cycle at 125°C limit practical continuous output current to ~350 mA at 12 V from 3.3-V input (per Figure 28 and duty cycle equation). For 500-mA loads, use LM2731YMF or a higher-current alternative like TPS61088.
What is the recommended diode for use with the LM2731XMF?
Texas Instruments specifies the MBR0520 Schottky diode (20-V, 0.5-A average) for LM2731XMF applications. Its low forward voltage (~0.35 V at 150 mA) minimizes conduction loss, and fast recovery avoids reverse-recovery spikes. For >0.5-A loads, Microsemi UPS5817 is recommended per SNVS217G Section 8.2.2.5.
How does the LM2731XMF handle thermal overload conditions?
The LM2731XMF incorporates thermal shutdown that disables the internal FET when junction temperature exceeds ~160°C. Operation resumes automatically once the die cools to ~150°C, providing hysteresis to prevent cycling. This protection is independent of current limit and remains active even during shutdown pin assertion.
LM2731XMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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 FAQ
1.How can I place an order for LM2731XMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2731XMF 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 reliable?
The price and inventory of LM2731XMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2731XMF is usually 5 days.
3.What payment methods are accepted for LM2731XMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2731XMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2731XMF?
LM2731XMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2731XMF 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?
For technical support, including LM2731XMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2731XMF requirements.
6.How does Aetrix verify that LM2731XMF is sourced from the original manufacturer or authorized distributors?
All LM2731XMF 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 meets industry standards.
7.What is the process for return or replacement of LM2731XMF?
All LM2731XMF units undergo pre-shipment inspection (PSI). If there is an issue with LM2731XMF, 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 part is unused and in its original packaging.
Return procedure for LM2731XMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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