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Texas Instruments LM2733YMFX
- Part No.:
- LM2733YMFX
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2733YMFX.pdf
- Description:
- IC REG BOOST ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
LM2733YMFX from Texas Instruments is a 0.6-MHz fixed-frequency current-mode boost converter IC with integrated 40-V/1-A DMOS FET switch in SOT-23-5 package, delivering up to 330 mA typical output current at 12 V from 5-V input. It features 1.23-V feedback reference, cycle-by-cycle current limiting, and logic-level shutdown for battery-powered portable electronics.
For engineers reviewing the LM2733YMFX datasheet, LM2733YMFX pinout, LM2733YMFX application, or LM2733YMFX equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM2733YMFX employs peak-current-mode control with internal ramp compensation, enabling fast transient response across 2.7–14-V input range. Its 0.6-MHz switching frequency balances efficiency and component size, supporting compact 10-µH inductors and ceramic capacitors while maintaining stable regulation under load steps.
It integrates a 40-V DMOS FET with 650-mΩ typical RDS(ON), enabling output voltages ≥16 V. The FB pin senses output via resistive divider referenced to 1.23 V, and SHDN enables <1-µA quiescent shutdown-critical for PDA, digital camera, and portable phone power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 0.6 MHz (Y option): Enables use of smaller inductors (e.g., 10 µH) and 2.2-µF input / 4.7-µF output ceramic caps without EMI or stability penalties. |
| 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 regulated 5-V/12-V rails without external pre-regulation. |
| Feedback reference voltage | 1.23 V ±25 mV: Sets output voltage via R1/R2 divider; 13.3-kΩ R2 yields ~92-µA divider current, minimizing load error and noise sensitivity. |
| Switch current limit | 1 A (min) at ≤50% duty cycle: Limits peak inductor current to protect internal FET during startup or overload; derates above 50% per published curves. |
| RDS(ON) | 650 mΩ (typ) at ISW = 100 mA: Determines conduction loss; at 330-mA load and 62.5% duty cycle, contributes ~43 mW dissipation in FET. |
| Shutdown current | <1 µA: Extends battery life in standby mode; SHDN pin must be pulled to VIN or driven low-floating not allowed. |
| Thermal resistance θJA | 210 °C/W (SOT-23-5): With 125°C max junction temperature, limits continuous power dissipation to ~160 mW at 25°C ambient-dictating layout and load derating. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body), thermally enhanced for surface-mount PCB assembly with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Drain of internal DMOS FET | Switch node connecting to inductor and Schottky diode anode; carries high di/dt; requires short, low-inductance trace and local ground pour. |
| GND (Pin 2) | Analog and power ground | Common return for FB, SHDN, and internal bias circuits; must be tied directly to power ground plane beneath IC to minimize noise coupling. |
| FB (Pin 3) | Feedback input | High-impedance node sensing output voltage divider; sensitive to noise-keep traces short and away from SW node. |
| SHDN (Pin 4) | Logic-level shutdown control | Active-high input: ≥1.5 V enables operation; ≤0.5 V disables switching and reduces IQ to <1 µA; requires pull-up resistor if not driven. |
| VIN (Pin 5) | Power input | Supplies internal bias and gate drive; requires local 2.2-µF ceramic capacitor placed within 3 mm of pin to suppress high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates external compensation network-only feedforward capacitor Cf (82 pF for Y version) required for loop stability at 0.6 MHz. |
| 40-V integrated DMOS FET | Enables 12–40-V output generation from 3.3–12-V inputs without external high-voltage switch; supports white LED strings and local boost rails. |
| Cycle-by-cycle current limiting | Protects against short-circuit and overcurrent faults by terminating each switching pulse when sensed current exceeds threshold-no latch-up. |
| Low RDS(ON) and optimized thermal design | 650-mΩ on-resistance + 210 °C/W θJA allows 330-mA continuous output at 12 V with minimal board area and no heatsink in typical layouts. |
| Logic-compatible shutdown | SHDN pin accepts standard CMOS/TTL levels; ties directly to microcontroller GPIO or system enable rail-no level-shifting needed. |
Applications
| White LED Backlighting | Digital Camera Power Supply |
|---|---|
|
Use Scenario: Driving 3–5 white LEDs (3.2–3.6 V each) in series from a 3.3-V or 5-V battery source in compact handheld cameras. IC Role / Device Role / Timing Role: Boost converter providing constant-current LED drive via external current-sense resistor and feedback loop. Use Value: Delivers 330 mA at 12–18 V with >85% efficiency at 5-V input, enabling brighter displays without increasing battery drain or board area. |
Use Scenario: Generating 12-V flash capacitor charging rail and 5-V sensor bias from a single 3.7-V Li-ion cell in DSLR or mirrorless camera modules. IC Role / Device Role / Timing Role: High-efficiency boost regulator supplying isolated, low-noise analog and digital subsystems. Use Value: 0.6-MHz operation minimizes EMI near image sensors; internal current limiting prevents flash capacitor inrush damage during rapid charge cycles. |
| Portable Phone Display Boost | PDA System Voltage Booster |
|
Use Scenario: Raising 3.3-V system rail to 15–20 V for AMOLED display panel gate drivers and source drivers in smartphones. IC Role / Device Role / Timing Role: Primary DC-DC boost stage delivering regulated high-voltage rail with tight line/load regulation. Use Value: 1.23-V FB reference and 0.6-MHz switching enable precise output control and small external components-critical for thin bezel designs. |
Use Scenario: Converting 3.3-V main supply to 12-V for SD card interface, backlight, or peripheral expansion in legacy PDAs and handheld terminals. IC Role / Device Role / Timing Role: Compact, self-contained boost solution replacing discrete FET+controller designs. Use Value: SOT-23-5 footprint and internal compensation reduce BOM count by ≥4 components versus controller-based solutions-accelerating time-to-market. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2733XMF/NOPB | 1.6-MHz switching frequency; higher RDS(ON) (650 mΩ vs. same), identical pinout and FB reference. | Better suited for ultra-compact layouts requiring smallest inductors/caps; trades ~2–3% efficiency for size reduction. | Select LM2733XMF/NOPB when board space is constrained and 1.6-MHz EMI can be filtered; LM2733YMFX preferred for efficiency-critical 0.6-MHz systems. |
| TPS61040DRVR | Fixed 500-kHz frequency, 28-V FET, 0.5-A switch current limit, different pinout (SW/GND/FB/VIN/EN), 1.25-V FB reference. | Lower output voltage capability (≤28 V); requires redesign of feedback divider and layout; lacks 40-V headroom for 30–40-V LED strings. | Choose TPS61040DRVR only if 28-V max output suffices and existing design uses TI's 500-kHz boost family; LM2733YMFX retains full 40-V flexibility and direct SOT-23-5 compatibility. |
Compared with LM2733XMF/NOPB, LM2733YMFX trades higher efficiency and lower EMI at 0.6 MHz for larger passives; versus TPS61040DRVR, it offers 40-V capability and identical SOT-23-5 footprint but requires FB divider recalibration due to 1.23-V vs. 1.25-V reference.
Availability
LM2733YMFX is available at Aetrix Electronics and suitable for portable electronics, imaging systems, and industrial HMI displays requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM2733YMFX 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 ICs, with decades of expertise in high-efficiency DC-DC conversion and portable power solutions.
The LM2733YMFX belongs to TI's high-frequency boost converter product line, designed specifically for space-constrained, battery-operated devices needing reliable 0.6-MHz boost capability with integrated 40-V FET and minimal external components.
FAQ
What is the maximum output voltage achievable with the LM2733YMFX?
The LM2733YMFX supports output voltages up to 40 V, limited by its 40-V internal DMOS FET breakdown rating and the maximum duty cycle of 96% at 0.6 MHz. Real-world outputs of 30–35 V are routinely achieved with proper layout, Schottky diode selection (e.g., MBR0540), and thermal management-verified in TI's Figure 23 efficiency curves for VOUT = 40 V.
How does the LM2733YMFX differ from the LM2733XMF in practical design?
The LM2733YMFX operates at 0.6 MHz versus 1.6 MHz for the LM2733XMF, resulting in lower switching losses, higher efficiency at medium loads, and reduced EMI-especially critical near RF or image sensors. It uses larger inductors (e.g., 10 µH vs. 4.7 µH) and slightly larger capacitors but maintains identical SOT-23-5 pinout, FB reference, and protection features.
Can the LM2733YMFX drive white LED strings requiring constant current?
Yes-the LM2733YMFX can be configured as a constant-current LED driver by replacing the upper feedback resistor (R1) with an LED string and sensing current through a low-value sense resistor to ground. TI's Application Note SNVA210 demonstrates this topology, achieving <±3% current regulation using the 1.23-V FB reference and internal current limiting for fault protection.
What is the recommended feedforward capacitor value for the LM2733YMFX?
TI specifies 82 pF for the LM2733YMFX (Y version, 0.6 MHz) as the feedforward capacitor (Cf) between FB and VIN. This value places a zero in the control loop at ~8 kHz to ensure stability-confirmed in the Typical Application Circuit (Figure 24) and Section 8.2.2.4. Using 120 pF (for X version) or omitting Cf risks oscillation and poor transient response.
Does the LM2733YMFX require external compensation components?
No-the LM2733YMFX is internally compensated, eliminating the need for external Type-II or Type-III compensation networks. Only the feedforward capacitor Cf (82 pF) is required for loop stability. This simplifies design, reduces BOM count, and improves consistency across production units-explicitly stated in the Features and Detailed Description sections of the SNVS209G datasheet.
LM2733YMFX 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:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2733YMFX FAQ
1.How can I place an order for LM2733YMFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2733YMFX 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 LM2733YMFX reliable?
The price and inventory of LM2733YMFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2733YMFX is usually 5 days.
3.What payment methods are accepted for LM2733YMFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2733YMFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2733YMFX?
LM2733YMFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2733YMFX 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 LM2733YMFX?
For technical support, including LM2733YMFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2733YMFX requirements.
6.How does Aetrix verify that LM2733YMFX is sourced from the original manufacturer or authorized distributors?
All LM2733YMFX 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 LM2733YMFX meets industry standards.
7.What is the process for return or replacement of LM2733YMFX?
All LM2733YMFX units undergo pre-shipment inspection (PSI). If there is an issue with LM2733YMFX, 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 LM2733YMFX part is unused and in its original packaging.
Return procedure for LM2733YMFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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