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Texas Instruments LM2731YMF
- Part No.:
- LM2731YMF
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2731YMF.pdf
- Description:
- IC REG BOOST ADJ 1.8A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:726
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Product details
Overview
LM2731YMF from Texas Instruments is a 0.6-MHz fixed-frequency current-mode boost converter IC with integrated 22-V, 1.8-A DMOS FET switch in a 5-pin SOT-23 package. It operates from 2.7 V to 14 V input, delivers regulated output up to 20 V, and features cycle-by-cycle current limiting and thermal shutdown - ideal for space-constrained portable power rails in digital cameras and PDAs.
For engineers reviewing the LM2731YMF datasheet, LM2731YMF pinout, LM2731YMF application, or LM2731YMF equivalent, key selection criteria include its 0.6-MHz switching frequency (Y option), 1.23-V feedback reference, 300–450-mΩ typical RDS(ON), <1 µA shutdown current, and compatibility with tiny external components (e.g., 10-µH inductor, 4.7-µF ceramic output capacitor).
Technical Context
The LM2731YMF uses peak-current-mode control with an internal ramp generator and PWM comparator comparing sensed switch current against a Gm amplifier output derived from the FB node. Its 0.6-MHz oscillator provides fast transient response while enabling compact magnetics and low-profile capacitors.
Protection architecture includes per-cycle current limiting triggered by a sense resistor in series with the internal FET, plus thermal shutdown activating at ~160°C junction temperature and auto-recovering at ~150°C. The shutdown pin is active-low and requires tie-to-VIN or pullup if unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.6 MHz (Y option) - enables use of small 10-µH inductors and reduces EMI in lower RF bands vs 1.6-MHz X variant. |
| 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 wide industrial rails. |
| Internal Switch Rating | 22-V drain-source breakdown, 1.8-A peak current - allows boost outputs up to 20 V with margin for diode drop and transients. |
| Feedback Reference | 1.230 V ±25 mV (−40°C to 125°C) - sets output voltage via external resistor divider; enables precise regulation across temperature. |
| RDS(ON) | 300–450 mΩ (TJ = 25°C) - minimizes conduction loss at high load currents; contributes to >86% typical efficiency at 5-V to 12-V boost. |
| Shutdown Current | <1 µA - extends battery life in standby mode; pin must be actively driven low or tied to VIN (not floated). |
| Thermal Resistance | RθJA = 209.9°C/W (SOT-23) - limits continuous power dissipation to ~350 mW at 25°C ambient before thermal foldback. |
Pinout & Package
LM2731YMF is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm with standard footprint and thermal pad omitted. Pin 1 (SW) is the drain of the internal NMOS switch; Pin 5 (VIN) supplies power; Pin 3 (FB) senses output via resistive divider; Pin 2 (GND) serves as analog and power return; Pin 4 (SHDN) controls enable/disable state.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Drain Output | Connects to inductor and Schottky diode anode; carries pulsed 1.8-A peak current; requires low-inductance layout to minimize ringing. |
| GND (Pin 2) | Analog & Power Ground | Single-point return for FB, SHDN, and internal bias; must be routed with low impedance to minimize noise coupling into feedback path. |
| FB (Pin 3) | Feedback Input | High-impedance node (50–500 nA bias) sensing divided output voltage; sensitive to PCB leakage and noise - keep short and away from SW node. |
| SHDN (Pin 4) | Enable/Disable Control | Active-low logic input; must be pulled to VIN or driven low; floating condition causes undefined operation and potential shoot-through risk. |
| VIN (Pin 5) | Power Input | Accepts 2.7–14 V; feeds internal bias circuitry and switch driver; requires local 2.2-µF ceramic decoupling placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network; only feedforward capacitor (CF ≈ 220 pF) required for stability across operating conditions. |
| Cycle-by-cycle current limiting | Protects internal FET during overload or short-circuit events by terminating each switching cycle when sensed current exceeds threshold. |
| Low RDS(ON) DMOS FET | Reduces conduction losses at high duty cycles; enables >85% efficiency at 300-mA load in 5-V-to-12-V boost configuration. |
| Logic-level shutdown | Supports system-level power sequencing; <1 µA quiescent current in shutdown extends battery runtime in always-on portable devices. |
| Wide input range (2.7 V to 14 V) | Accommodates aging batteries and unregulated supplies without external pre-regulation; simplifies BOM for multi-rail portable systems. |
Applications
| White LED Backlighting | Digital Camera Power Rail |
|---|---|
Use Scenario: Driving 3–5串联 white LEDs from a single Li-ion cell (3.0–4.2 V) requiring constant-current regulation at ~20 mA per string. IC Role / Device Role / Timing Role: Boost converter providing stable 12–18 V output; FB pin referenced to current-sense resistor for closed-loop current control. Use Value: Enables high-brightness display backlighting with minimal board area; 0.6-MHz operation avoids audible noise while supporting small 10-µH inductors. |
Use Scenario: Generating 5 V and 3.3 V rails from a 3.7-V Li-ion battery for image sensor, ISP, and memory subsystems. IC Role / Device Role / Timing Role: Primary boost stage delivering up to 500 mA at 5 V; paired with LDOs for clean low-noise secondary rails. Use Value: High power density (SOT-23 + tiny passives) fits tight camera module layouts; thermal shutdown prevents damage during flash-triggered load surges. |
| PDA/System-on-Module Local Boost | Portable Audio Codec Supply |
Use Scenario: Providing 12 V for analog front-end op-amps or DACs in handheld PDAs where main rail is 3.3 V. IC Role / Device Role / Timing Role: Local point-of-load boost regulator; feedback divider sets exact output voltage; SHDN pin synchronized to system sleep mode. Use Value: Eliminates need for external discrete FET and controller; <1 µA shutdown current preserves battery charge during extended idle periods. |
Use Scenario: Supplying 5 V to audio codecs requiring low-noise, stable bias for headphone amplifiers and ADC/DAC sections. IC Role / Device Role / Timing Role: Low-ripple boost source; output filtered with ceramic + tantalum stack to suppress switching noise below 20 kHz. Use Value: 0.6-MHz switching places fundamental frequency outside audio band; internal compensation ensures stable regulation under dynamic load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2731XMF | 1.6-MHz switching frequency; higher RDS(ON) (typ. 400 mΩ); same package and pinout. | Better suited for ultra-compact designs needing smallest possible inductors; trades ~3–5% efficiency for size reduction. | Select LM2731XMF only when board area is constrained and EMI filtering can accommodate higher-frequency harmonics. |
| TPS61022DRVR | 2.2-MHz fixed frequency; 5.5-V max input; integrated 1.5-A switch; different pinout and no SHDN pin. | Limited to lower-input-voltage systems (≤5.5 V); lacks shutdown control and wide VIN range of LM2731YMF. | Choose TPS61022DRVR for cost-sensitive, low-VIN consumer devices where shutdown functionality is unnecessary. |
Compared with LM2731XMF and TPS61022DRVR, the LM2731YMF uniquely balances mid-frequency switching (0.6 MHz), wide 2.7–14-V input support, and active shutdown control - making it optimal for battery-powered industrial and imaging equipment requiring robustness, efficiency, and design flexibility.
Availability
LM2731YMF is available at Aetrix Electronics and suitable for portable medical monitors, handheld test instruments, and IoT edge nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2731YMF 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 over 50 years of innovation in high-reliability power conversion solutions.
The LM2731 family was designed specifically for space-constrained portable electronics requiring high-efficiency, integrated boost conversion - emphasizing minimal external component count, thermal resilience, and seamless integration into battery-powered systems.
FAQ
What is the maximum output voltage achievable with the LM2731YMF?
The LM2731YMF supports output voltages up to 20 V, limited by its 22-V internal FET breakdown rating and safe operating area. This assumes proper selection of external Schottky diode (e.g., MBR0520, 20-V rating) and output capacitor rated ≥25 V. Exceeding 20 V risks FET avalanche failure and is not supported per datasheet absolute maximum ratings.
Does the LM2731YMF require external compensation components?
The LM2731YMF is internally compensated, eliminating the need for traditional Type-II or Type-III compensation networks. However, a feedforward capacitor (CF = 220 pF recommended) between FB and VIN is mandatory for loop stability across all operating conditions, as specified in the datasheet's Figure 26 and Section 8.2.2.4.
Can the LM2731YMF operate with a 2.5-V input supply?
No - the LM2731YMF has a minimum recommended input voltage of 2.7 V per Section 6.3. Operation below 2.7 V may result in unstable regulation, failure to start, or violation of guaranteed electrical characteristics. For sub-2.7-V inputs, consider TI's TPS61200 or similar ultra-low-VIN boost converters.
What is the purpose of the SHDN pin on the LM2731YMF, and how should it be used?
The SHDN pin on the LM2731YMF is an active-low enable control that reduces quiescent current to <1 µA when pulled low. If unused, it must be tied directly to VIN - floating or leaving it unterminated causes unpredictable behavior. A 50–100-kΩ pullup to VIN is recommended only when external logic-level control is needed.
How does the LM2731YMF handle thermal overload conditions?
The LM2731YMF incorporates thermal shutdown that disables the internal FET when junction temperature exceeds ~160°C. The device remains latched off until temperature drops to ~150°C, then automatically resumes normal operation. This protection is independent of current limit and ensures reliability during sustained overload or poor PCB thermal design.
LM2731YMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.23V
- Voltage - Output (Max):
- 22V (Switch)
- Current - Output:
- 1.8A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2731YMF FAQ
1.How can I place an order for LM2731YMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2731YMF 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 LM2731YMF reliable?
The price and inventory of LM2731YMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2731YMF is usually 5 days.
3.What payment methods are accepted for LM2731YMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2731YMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2731YMF?
LM2731YMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2731YMF 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 LM2731YMF?
For technical support, including LM2731YMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2731YMF requirements.
6.How does Aetrix verify that LM2731YMF is sourced from the original manufacturer or authorized distributors?
All LM2731YMF 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 LM2731YMF meets industry standards.
7.What is the process for return or replacement of LM2731YMF?
All LM2731YMF units undergo pre-shipment inspection (PSI). If there is an issue with LM2731YMF, 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 LM2731YMF part is unused and in its original packaging.
Return procedure for LM2731YMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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