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Texas Instruments LM2733XMF
- Part No.:
- LM2733XMF
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2733XMF.pdf
- Description:
- IC REG BOOST ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,477
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Product details
Overview
LM2733XMF 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), and internal compensation. It operates from 2.7 V to 14 V input and delivers up to 330 mA typical output current at 12 V in SOT-23-5 package - used as local high-voltage boost regulator in portable power rails.
For engineers reviewing the LM2733XMF datasheet, LM2733XMF pinout, LM2733XMF application, or LM2733XMF equivalent, key selection criteria include switching frequency stability across temperature (±25% over −40°C to +125°C), feedback reference voltage accuracy (1.230 V ±25 mV), shutdown threshold (1.5 V typ), quiescent current in active mode (2.1 mA), and thermal derating behavior above 87% duty cycle.
Technical Context
The LM2733XMF implements peak-current-mode control with cycle-by-cycle current limiting and an internal ramp generator synchronized to a 1.6-MHz oscillator. Its Gm error amplifier compares FB pin voltage against 1.23-V internal reference to adjust PWM duty cycle, while the current-sense path uses the FET's RDS(ON) for direct peak-current detection without external sense resistor.
Shutdown is logic-level active-low with <1 µA leakage when asserted, and the device enters thermal shutdown if junction temperature exceeds 125°C. Internal compensation eliminates need for external Type-II/III networks, relying on feedforward capacitor Cf (220 pF) to place loop zero at ~8 kHz for stability across load and input variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 1.6 MHz nominal; supports compact 10-µH inductors and 2.2-µF ceramic input caps without audible noise or EMI filtering overhead. |
| Input voltage range | 2.7 V to 14 V; enables direct operation from single Li-ion (3.0–4.2 V), dual AA/AAA (2.4–3.2 V), or 5-V/12-V system rails. |
| Feedback reference voltage | 1.230 V ±25 mV; sets output via resistive divider (e.g., R1 = 117 kΩ, R2 = 13.3 kΩ for 12 V), enabling precise regulation independent of load or line variation. |
| RDS(ON) | 500 mΩ max at ISW = 100 mA; limits conduction loss to <50 mW at 100 mA, supporting >85% efficiency at 5 V → 12 V / 330 mA. |
| Switch current limit | 1 A min (duty ≤50%); provides robust short-circuit protection and defines maximum deliverable power before thermal foldback. |
| Quiescent current | 2.1 mA typ at 5 V input; balances fast transient response against battery drain in always-on boost stages. |
| Shutdown current | <1 µA; extends battery life in sleep modes without external disconnect circuitry. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178 compliant.
| 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 requiring tight layout. |
| GND (Pin 2) | Power and analog ground | Common return for input cap, output cap, feedback divider, and internal bias circuits; must be low-impedance copper pour under IC. |
| FB (Pin 3) | Feedback input | High-impedance (60 nA bias) node sensing resistive divider output; sets regulated output voltage via 1.23-V reference. |
| SHDN (Pin 4) | Shutdown control | Active-low logic input; <0.5 V disables switching and reduces IQ to <1 µA; tie to VIN if unused (no pullup required). |
| VIN (Pin 5) | Power input | Primary supply input (2.7–14 V); powers internal bias, gate driver, and oscillator; requires local 2.2-µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40-V/1-A DMOS FET | Enables boost to ≥16 V without external switch; eliminates layout complexity and parasitic inductance of discrete FET+driver solutions. |
| 1.6-MHz fixed switching frequency | Reduces passive size by 4× vs 400-kHz converters; allows use of 10-µH inductors and 2.2–4.7-µF ceramics instead of larger, costlier components. |
| Internal compensation | Removes need for external compensation network; simplifies design, improves production yield, and avoids instability from PCB trace capacitance. |
| Cycle-by-cycle current limiting | Provides immediate overcurrent protection per switching cycle; prevents inductor saturation and thermal runaway during output shorts or startup surges. |
| Logic-level shutdown | Supports direct interface to microcontroller GPIO without level-shifting; <1 µA shutdown current extends battery runtime in portable devices. |
Applications
| White LED Backlighting | Portable Audio DAC Power |
|---|---|
Use Scenario: Driving 3–5串联 white LEDs (9–18 V forward) from a 3.3-V Li-ion cell in Bluetooth headphones. IC Role / Device Role / Timing Role: Boost converter providing constant-current source via external current-sense resistor and FB pin regulation. Use Value: Delivers stable 12-V rail at 330 mA with >87% efficiency, enabling >10-hour playback without thermal throttling in SOT-23 footprint. | Use Scenario: Generating clean 5-V analog supply for audio DAC and op-amps in portable media players. IC Role / Device Role / Timing Role: Local boost regulator isolating sensitive analog circuitry from noisy digital 3.3-V domain. Use Value: Low 2.1-mA quiescent current minimizes battery drain during standby; 1.6-MHz operation avoids audible switching noise in audio band. |
| Digital Camera Flash Charging | IoT Sensor Node Local Boost |
Use Scenario: Charging 100-µF flash capacitor to 30 V from 3.6-V primary battery in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-voltage boost stage operating in discontinuous mode for burst charging. Use Value: 40-V internal FET supports 30-V output without external HV switch; 96% max duty cycle enables full charge in <2 s with 10-µH inductor. | Use Scenario: Powering 3.3-V RF transceiver and 5-V sensor interface from 2.7-V coin cell in wireless environmental monitors. IC Role / Device Role / Timing Role: Always-on boost regulator maintaining regulated output during intermittent sensor wake cycles. Use Value: <1 µA shutdown current preserves 10-year coin cell life; wide 2.7–14 V input accommodates aging battery voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2733YMF | 600-kHz switching frequency; higher efficiency at medium loads but requires larger 22-µH inductor and 4.7-µF input cap. | Better suited for low-EMI, battery-sensitive applications where size is secondary to efficiency above 100 mA. | Select LM2733YMF when optimizing for >90% efficiency at 150–500 mA and lower radiated emissions in EMC-constrained designs. |
| TPS61040DRVR | 1-MHz switching; 28-V FET; 0.5-A switch current limit; requires external compensation; no integrated feedforward capacitor. | Offers tighter output voltage tolerance (±1.5%) but needs additional stability components and cannot reach 40-V output safely. | Choose TPS61040DRVR only when 28-V max output suffices and board space allows extra 2–3 passives for loop compensation. |
Compared with LM2733YMF and TPS61040DRVR, the LM2733XMF uniquely combines 1.6-MHz operation, 40-V FET, and internal compensation in SOT-23-5 - making it optimal for space-constrained, high-output-voltage boost applications where minimal BOM count and fast transient response are critical.
Availability
LM2733XMF is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and battery-powered IoT gateways requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM2733XMF 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 company headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The LM2733 product line delivers highly integrated, small-footprint DC/DC boost converters targeting portable and space-constrained applications needing efficient, high-voltage rail generation from single-cell batteries or low-voltage system supplies.
FAQ
What is the maximum output voltage achievable with the LM2733XMF?
The LM2733XMF supports output voltages up to 40 V, limited by its 40-V internal DMOS FET breakdown rating and maximum duty cycle of 93% at full temperature range. In practice, stable operation at 35 V is confirmed in TI's typical characteristics (Figure 16–23), with proper selection of Schottky diode (e.g., MBR0540) and output capacitor rated ≥50 V.
Does the LM2733XMF require an external compensation network?
No, the LM2733XMF features fully internal compensation, eliminating external Type-II or Type-III networks. Stability is maintained using only the required feedforward capacitor Cf (220 pF) between FB and GND, as specified in the typical application circuit. This reduces component count and layout sensitivity while ensuring robust performance across input, load, and temperature variations.
How does shutdown functionality work on the LM2733XMF?
The LM2733XMF SHDN pin is active-low: pulling it below 0.5 V disables switching and reduces quiescent current to <1 µA. When unused, TI recommends tying SHDN directly to VIN - no pullup resistor needed. Leaving SHDN floating is prohibited, as it may cause erratic enable/disable behavior due to noise coupling or internal leakage paths.
Can the LM2733XMF drive a 12-V, 330-mA load from a 3.3-V input?
Yes, the LM2733XMF delivers 330 mA typical at 12 V from 3.3-V input, as verified in Figure 11 (Efficiency vs Load Current, VIN = 3.3 V). Achieving this requires proper selection of 10-µH inductor, MBR0520 Schottky diode, 2.2-µF input ceramic, and 4.7-µF output ceramic capacitors - all specified in the LM2733XMF typical application circuit.
What thermal considerations apply to continuous operation of the LM2733XMF?
At ambient temperatures above 60°C or duty cycles exceeding 87%, the LM2733XMF relies on its internal thermal shutdown (TJ = 125°C) to prevent damage. For sustained 330-mA output at 12 V, maintain θJA ≤210°C/W via adequate PCB copper area under Pin 2 (GND) and avoid enclosing the SOT-23-5 in sealed enclosures without airflow.
LM2733XMF 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
LM2733XMF FAQ
1.How can I place an order for LM2733XMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2733XMF 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 LM2733XMF reliable?
The price and inventory of LM2733XMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2733XMF is usually 5 days.
3.What payment methods are accepted for LM2733XMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2733XMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2733XMF?
LM2733XMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2733XMF 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 LM2733XMF?
For technical support, including LM2733XMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2733XMF requirements.
6.How does Aetrix verify that LM2733XMF is sourced from the original manufacturer or authorized distributors?
All LM2733XMF 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 LM2733XMF meets industry standards.
7.What is the process for return or replacement of LM2733XMF?
All LM2733XMF units undergo pre-shipment inspection (PSI). If there is an issue with LM2733XMF, 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 LM2733XMF part is unused and in its original packaging.
Return procedure for LM2733XMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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