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Texas Instruments LM2733XMFX
- Part No.:
- LM2733XMFX
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2733XMFX.pdf
- Description:
- IC REG BOOST ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,366
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Product details
Overview
LM2733XMFX from Texas Instruments is a fixed-frequency current-mode boost converter IC with an integrated 40-V, 1-A DMOS FET switch, 1.6-MHz switching frequency, 2.7–14-V input range, and internal compensation - designed for compact, high-efficiency local voltage boosting in portable power rails.
For engineers reviewing the LM2733XMFX datasheet, LM2733XMFX pinout, LM2733XMFX application, or LM2733XMFX equivalent, key selection considerations include its SOT-23-5 package footprint, cycle-by-cycle current limiting, shutdown quiescent current <1 µA, feedback reference voltage of 1.23 V, and suitability for output voltages up to 40 V with external diode and inductor.
Technical Context
The LM2733XMFX employs peak-current-mode control with a built-in ramp generator and PWM comparator, using the SW node voltage (via internal sense FET RDS(ON)) to derive real-time current feedback. Its fixed 1.6-MHz oscillator enables small external passive components while maintaining stable regulation across wide load and input voltage ranges.
Operation relies on a bandgap-derived 1.23-V FB reference, externally scaled via resistive divider, and integrates thermal shutdown and pulse-by-pulse current limiting. The SHDN pin provides logic-level enable/disable with sub-1-µA off-state current, and internal compensation eliminates need for external loop compensation networks.
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 PCB layouts. |
| Input voltage range | 2.7 V to 14 V; supports single-cell Li-ion, dual-cell alkaline/NiMH, and regulated 3.3/5-V system rails. |
| FET breakdown voltage | 40 V; allows regulated outputs up to 35 V with margin, compatible with MBR0540 Schottky diode for ≥30-V designs. |
| Switch current limit | 1 A (min) at ≤50% duty cycle; delivers up to 330 mA typical at 12 V out from 5-V input per typical application data. |
| Feedback reference | 1.23 V ±25 mV (−40°C to +125°C); sets output voltage via external resistor divider (e.g., R1 = 117 kΩ, R2 = 13.3 kΩ for 12 V). |
| Quiescent current | 2.1 mA (active, "X" version); drops to <1 µA in shutdown - extends battery life in always-on portable systems. |
| RDS(ON) | 650 mΩ (max at 100 mA); limits conduction loss in high-duty-cycle boost stages; increases slightly below 5-V input. |
Pinout & Package
LM2733XMFX is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed pad not electrically connected. Thermal resistance RθJA is 210°C/W, requiring minimal copper area for standard operation up to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch drain node | Connects to inductor and Schottky diode anode; carries pulsed 1-A peak current; must be routed with low-inductance, short trace. |
| GND (Pin 2) | Analog and power ground | Common return for FB, SHDN, VIN, and internal circuitry; requires direct connection to power plane under IC for stability. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistive divider; 60-nA bias current enables high-impedance dividers without error contribution. |
| SHDN (Pin 4) | Shutdown control | Active-low logic input; <0.5 V disables regulator (IQ <1 µA); >1.5 V enables; must not float - tie to VIN if unused. |
| VIN (Pin 5) | Power input | Supplies internal circuitry and FET gate drive; accepts 2.7–14 V; requires local 2.2-µF ceramic capacitor placed within 3 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40-V, 1-A DMOS FET | Eliminates external high-voltage switch; supports ≥30-V output with MBR0540 diode and 10-µH inductor. |
| Fixed 1.6-MHz switching | Reduces required inductor size to ≤10 µH and output capacitance to 4.7 µF - ideal for space-constrained PDA/camera modules. |
| Cycle-by-cycle current limiting | Prevents inductor saturation and thermal runaway during overload or short-circuit; resets each clock cycle without latch-off. |
| Internally compensated | Removes need for external compensation network; only feedforward capacitor (Cf = 220 pF) required for loop stability. |
| Logic-level shutdown | Enables seamless integration into host MCU GPIO control; <1 µA shutdown current preserves battery charge in sleep modes. |
Applications
| White LED Backlighting | Portable Digital Camera Power |
|---|---|
|
Use Scenario: Driving 3–6串联 white LEDs (9–18 V forward) from a 3.7-V Li-ion cell in compact camera modules. IC Role / Device Role / Timing Role: Boost converter regulating constant current via FB-sensed voltage drop across sense resistor; 1.6-MHz switching minimizes EMI near image sensor. Use Value: Delivers 330 mA at 12 V with >85% efficiency at 5-V input, enabling slim bezel design without heat sinks or large inductors. |
Use Scenario: Generating 15-V rail for CCD/CMOS sensor bias and flash charging from 5-V USB or battery source. IC Role / Device Role / Timing Role: High-voltage boost stage with 40-V FET and MBR0530 diode; FB divider sets precise 15-V output for analog front-end stability. Use Value: Achieves 170 mA at 15 V (LM2733XMFX typical spec), supporting fast sensor readout and flash recharge without external LDO post-regulation. |
| PDA/System-on-Module Local Boost | Industrial Sensor Node Supply |
|
Use Scenario: Providing isolated 12-V auxiliary rail for RS-232 transceivers or SD card interface in handheld PDAs. IC Role / Device Role / Timing Role: Local DC/DC booster replacing inefficient charge pumps; SHDN pin synchronized to host processor sleep state. Use Value: Reduces solution size by 40% vs. discrete boost controller + MOSFET; <1 µA shutdown current extends standby time to weeks. |
Use Scenario: Powering 24-V industrial I/O modules (e.g., 4–20 mA loop drivers) from 12-V field bus with minimal board area. IC Role / Device Role / Timing Role: Compact, rugged boost stage operating over −40°C to +125°C ambient; thermal shutdown protects against enclosure overheating. Use Value: Supports 110 mA at 30 V output (per LM2733-Y/X application table), enabling full-scale analog output with single SOT-23 IC and no heatsink. |
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 | 600-kHz switching frequency; higher peak efficiency at medium loads but requires larger inductor (≥22 µH) and capacitor. | Better suited for noise-sensitive audio or RF sections where 1.6-MHz EMI is problematic; lower light-load IQ (1.1 mA). | Select LM2733YMF/NOPB when EMI filtering priority outweighs board space constraints and output voltage exceeds 25 V. |
| TPS61040DRVR | 2.5-MHz switching; 28-V FET; 0.4-A switch current limit; different pinout (6-pin WSON); requires external compensation. | Optimized for ultra-low-IQ (25 µA shutdown) and single-cell alkaline (0.9–5.5 V input); not rated for >28-V output. | Choose TPS61040DRVR for sub-1-V start-up or battery-gauge-critical applications; not drop-in for 40-V output or 1-A peak demands. |
Compared with LM2733XMFX, the LM2733YMF/NOPB trades switching speed for improved efficiency and EMI profile at the cost of larger passives, while the TPS61040DRVR offers lower quiescent current and wider input range but sacrifices output voltage headroom and peak current capability - making LM2733XMFX optimal for compact, high-output-voltage boost where 1.6-MHz operation is acceptable.
Availability
LM2733XMFX is available at Aetrix Electronics and suitable for portable medical monitors, digital imaging subsystems, and industrial sensor nodes requiring stable component supply with guaranteed long-term manufacturability and TI's full process documentation.
Supply support for LM2733XMFX 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 deep expertise in power management IC design and manufacturing reliability.
The LM2733 product line was engineered specifically for high-density portable power conversion - emphasizing minimal external component count, SOT-23 integration, and robust protection for battery-powered consumer and industrial equipment.
FAQ
What is the maximum output voltage achievable with LM2733XMFX?
The LM2733XMFX features a 40-V internal FET switch, enabling regulated output voltages up to 35 V with appropriate external Schottky diode (e.g., MBR0540) and layout practices. Per TI's typical application data, it delivers 110 mA at 30 V and 85 mA at 35 V from a 5-V input - all while maintaining >80% efficiency and stable regulation across temperature.
Does LM2733XMFX require external compensation components?
No, LM2733XMFX uses internal compensation, eliminating the need for external Type-II or Type-III compensation networks. Only a feedforward capacitor (Cf = 220 pF) is required between FB and GND to stabilize the control loop - as confirmed in the TI datasheet Figure 24 and Section 8.2.2.4. This reduces BOM count and layout sensitivity.
Can LM2733XMFX operate from a 2.7-V input source?
Yes, LM2733XMFX is fully specified to operate from 2.7 V to 14 V input. At 2.7 V, RDS(ON) increases slightly (up to 650 mΩ max), and maximum duty cycle remains ≥87%, enabling viable boost ratios - e.g., 2.7 V to 12 V (4.4×) with proper inductor sizing and thermal management per Section 8.2.2.9.
What is the purpose of the SHDN pin on LM2733XMFX?
The SHDN pin on LM2733XMFX is an active-low logic input that disables the regulator and reduces quiescent current to <1 µA. When pulled below 0.5 V, the IC halts switching and discharges internal nodes; when held above 1.5 V, normal operation resumes. TI specifies it must never be left floating - tie to VIN if unused.
How does LM2733XMFX handle overcurrent conditions?
LM2733XMFX implements cycle-by-cycle current limiting: each switching cycle measures peak FET current via internal RDS(ON) sensing, and terminates the pulse immediately upon reaching the 1-A (min) limit. This prevents thermal runaway during overload or short-circuit while allowing automatic recovery on the next clock edge - no latch or external reset required.
LM2733XMFX 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):
- 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 FAQ
1.How can I place an order for LM2733XMFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2733XMFX 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 reliable?
The price and inventory of LM2733XMFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2733XMFX is usually 5 days.
3.What payment methods are accepted for LM2733XMFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2733XMFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2733XMFX?
LM2733XMFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2733XMFX 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?
For technical support, including LM2733XMFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2733XMFX requirements.
6.How does Aetrix verify that LM2733XMFX is sourced from the original manufacturer or authorized distributors?
All LM2733XMFX 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 meets industry standards.
7.What is the process for return or replacement of LM2733XMFX?
All LM2733XMFX units undergo pre-shipment inspection (PSI). If there is an issue with LM2733XMFX, 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 part is unused and in its original packaging.
Return procedure for LM2733XMFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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