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Texas Instruments LM2733XMFX/NOPB
- Part No.:
- LM2733XMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2733XMFX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,930
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Product details
Overview
LM2733XMFX/NOPB from Texas Instruments is a 1.6-MHz fixed-frequency current-mode boost converter IC with integrated 40-V/1-A DMOS FET switch, 500-mΩ RDS(ON), 2.7–14-V input range, and 1.23-V feedback reference voltage. It delivers up to 330 mA at 12 V output in compact SOT-23-5 packages for portable power rail generation.
For engineers reviewing the LM2733XMFX/NOPB datasheet, LM2733XMFX/NOPB pinout, LM2733XMFX/NOPB application, or LM2733XMFX/NOPB equivalent, key selection criteria include switching frequency stability across temperature (±0.25 MHz), cycle-by-cycle current limiting, internal compensation, shutdown quiescent current (<1 µA), and compatibility with ceramic input/output capacitors and Schottky diodes in space-constrained designs.
Technical Context
The LM2733XMFX/NOPB implements peak-current-mode control using an internal ramp generator and PWM comparator, where switch current sensing feeds both regulation and pulse-by-pulse current limiting. Its 1.6-MHz oscillator sets timing independent of load or input voltage, enabling fast transient response and small external passive components.
Feedback regulation relies on a precision 1.23-V bandgap reference applied to the FB pin; output voltage is set by an external resistive divider. The SHDN pin provides logic-level enable/disable with <2 µA bias current and 1.5-V turn-on threshold, supporting battery-life extension in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 1.6 MHz (typical); enables use of ≤10-µH inductors and ≤4.7-µF ceramic capacitors for ultra-compact layouts. |
| 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 5-V/12-V system rails. |
| Internal FET rating | 40-V drain-source breakdown, 1-A peak switch current limit; allows regulated outputs ≥16 V (e.g., 20 V, 30 V, 40 V) without external high-voltage switches. |
| RDS(ON) | 500 mΩ (typical at ISW = 100 mA); minimizes conduction loss and thermal rise in high-duty-cycle boost applications. |
| FB reference voltage | 1.230 V (±2.5% over −40°C to +125°C); defines output accuracy via external resistor divider (e.g., R1 = 117 kΩ, R2 = 13.3 kΩ for 12 V). |
| Shutdown current | <1 µA (typical); extends battery runtime in standby mode without requiring external disconnect circuitry. |
| Thermal resistance | RθJA = 210°C/W (SOT-23-5); requires minimal PCB copper area for thermal management in 330-mA continuous operation. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected; standard JEDEC DBV footprint compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Drain of internal 40-V DMOS FET; connects to inductor and Schottky diode anode; carries high dv/dt switching waveform. |
| GND (Pin 2) | Ground reference | Common analog and power ground return for FB, SHDN, VIN, and internal regulator; must be low-impedance connection to minimize noise coupling. |
| FB (Pin 3) | Feedback input | High-impedance (60 nA bias) node sensing output voltage via resistive divider; regulates output to 1.23 V at this pin. |
| SHDN (Pin 4) | Enable control | Logic-level input; device enabled when >1.5 V, disabled when <0.5 V; tie to VIN if unused; requires pull-up resistor for active control. |
| VIN (Pin 5) | Power input | Main supply input (2.7–14 V); powers internal bias circuits and gate driver; requires local 2.2-µF ceramic decoupling capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.6-MHz switching | Enables consistent EMI profile and predictable filter design; eliminates need for external frequency-setting components. |
| Internally compensated | Reduces BOM count by eliminating external compensation network; stable with standard 220-pF feedforward capacitor (Cf) and 13.3-kΩ R2. |
| Cycle-by-cycle current limiting | Prevents switch overcurrent during startup, short-circuit, or overload; resets each clock cycle without latch-up or thermal shutdown delay. |
| Low RDS(ON) FET | 500-mΩ conduction resistance improves efficiency at 330-mA load (e.g., >85% at 5-VIN/12-VOUT), reducing thermal stress in SOT-23 package. |
| Logic-level shutdown | 1.5-V enable threshold ensures compatibility with 1.8-V, 3.3-V, and 5-V microcontrollers; <1-µA shutdown current preserves battery capacity. |
Applications
| White LED Backlighting | Portable Audio Power Supply |
|---|---|
Use Scenario: Driving 3–6串联 white LEDs (3.0–3.6 V each) from a single Li-ion cell (3.0–4.2 V) in smartphones or tablets. IC Role / Device Role / Timing Role: Boost converter regulating constant current through LED string via FB-sensed voltage drop across sense resistor. Use Value: Delivers 330 mA at 12–20 V output with >87% efficiency; 1.6-MHz operation avoids audible noise and enables tiny 4.7-µF ceramic output capacitor. | Use Scenario: Generating 5-V or 9-V bias for Class D audio amplifiers in Bluetooth speakers or portable headphones. IC Role / Device Role / Timing Role: Local boost regulator providing clean, low-noise power independent of main system rail; shutdown controlled by host MCU. Use Value: Achieves 330-mA output with <1-µA quiescent current in shutdown; internal compensation simplifies layout near sensitive analog audio stages. |
| Digital Camera Flash Charging | PDA/System-on-Module Auxiliary Rail |
Use Scenario: Charging high-voltage capacitor (≥200 V) for xenon flash via intermediate 20–30 V boost stage in compact digital cameras. IC Role / Device Role / Timing Role: Primary boost stage stepping 3.3 V or 5 V to 20–30 V; feeds charge pump or flyback controller. Use Value: 40-V FET withstands 30-V output with margin; 1.6-MHz switching allows miniature 10-µH inductor and reduces EMI filtering requirements. | Use Scenario: Providing 3.3-V or 5-V auxiliary supply for USB PHY, SD card interface, or display controller in embedded PDA or IoT module designs. IC Role / Device Role / Timing Role: Compact, self-contained boost regulator replacing discrete FET+controller solutions; integrates current sensing and protection. Use Value: SOT-23-5 footprint saves >50% board area vs. SOIC-8 alternatives; cycle-by-cycle current limiting prevents damage during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2733YMF/NOPB | 0.6-MHz switching frequency; higher efficiency at medium loads but requires larger inductors/capacitors. | Better suited for lower-EMI, higher-efficiency applications where board space is less constrained. | Select when optimizing for peak efficiency >89% at 100–200 mA rather than minimum footprint. |
| TPS61040DRVR | 2.5-MHz switching; 28-V FET; 0.5-A switch current; different FB reference (1.25 V) and pinout. | Higher frequency enables smaller passives but limited to ≤28-V output; no direct pin compatibility. | Choose for 2.5-MHz operation and tighter output tolerance (±1.5%), accepting non-drop-in replacement effort. |
Compared with LM2733YMF/NOPB, the LM2733XMFX/NOPB trades ~2% efficiency for 2.7× higher switching frequency and 40% smaller magnetics; versus TPS61040DRVR, it offers 12-V higher FET breakdown and identical SOT-23-5 footprint but requires different feedback divider and compensation.
Availability
LM2733XMFX/NOPB is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and battery-powered imaging devices requiring stable component supply and long-term production continuity.
Supply support for LM2733XMFX/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and broad technical documentation.
The LM2733 product line targets high-density portable power conversion, specifically addressing space-constrained boost applications needing integrated FETs, fixed-frequency operation, and robust protection - designed for consumer, industrial, and medical portable electronics.
FAQ
What is the maximum output voltage achievable with the LM2733XMFX/NOPB?
The LM2733XMFX/NOPB features a 40-V internal DMOS FET switch, allowing regulated output voltages up to 35–40 V depending on diode and layout losses. Typical validated applications include 12 V, 15 V, 20 V, 25 V, 30 V, and 35 V outputs. Output voltage is set by the FB resistive divider; ensure SW node voltage remains below 40 V under all operating conditions including transients.
Does the LM2733XMFX/NOPB require external compensation components?
The LM2733XMFX/NOPB is internally compensated and does not require external compensation networks. However, a feedforward capacitor (Cf = 220 pF typical) between FB and VIN is mandatory for loop stability and must be placed close to the IC. Omitting Cf causes oscillation; values outside 120–330 pF degrade phase margin.
Can the LM2733XMFX/NOPB operate with a 1.8-V input supply?
No. The LM2733XMFX/NOPB has a minimum recommended input voltage of 2.7 V per datasheet Section 6.3. Operation below 2.7 V risks failure to start, unstable regulation, or excessive RDS(ON) due to insufficient gate drive. 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 LM2733XMFX/NOPB, and how should it be used?
The SHDN pin on the LM2733XMFX/NOPB enables logic-level control of device operation: voltage >1.5 V enables switching, <0.5 V disables it with <1-µA quiescent current. If unused, tie SHDN directly to VIN. For MCU control, use a pull-up resistor (50–100 kΩ) to VIN and drive low via open-drain or push-pull output. Never leave SHDN floating.
Which Schottky diode is recommended for use with the LM2733XMFX/NOPB in a 12-V output application?
For a 12-V output application, TI specifies the MBR0520 (20-V, 0.5-A Schottky) as the recommended diode in the LM2733XMFX/NOPB typical application circuit. Its low forward voltage (~0.35 V at 330 mA) minimizes conduction loss, and its 20-V rating provides adequate margin above the 12-V output while maintaining fast recovery and low capacitance.
LM2733XMFX/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):
- 40V (Switch)
- Current - Output:
- 1A (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
LM2733XMFX/NOPB FAQ
1.How can I place an order for LM2733XMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2733XMFX/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 LM2733XMFX/NOPB reliable?
The price and inventory of LM2733XMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2733XMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2733XMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2733XMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2733XMFX/NOPB?
LM2733XMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2733XMFX/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 LM2733XMFX/NOPB?
For technical support, including LM2733XMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2733XMFX/NOPB requirements.
6.How does Aetrix verify that LM2733XMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2733XMFX/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 LM2733XMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2733XMFX/NOPB?
All LM2733XMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2733XMFX/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 LM2733XMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2733XMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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