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Texas Instruments LM2733XMF/NOPB
- Part No.:
- LM2733XMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2733XMF/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,440
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Product details
Overview
LM2733XMF/NOPB 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. It delivers up to 330 mA at 12 V output in typical applications such as white LED biasing and portable device local boost regulation.
For engineers reviewing the LM2733XMF/NOPB datasheet, LM2733XMF/NOPB pinout, LM2733XMF/NOPB application, or LM2733XMF/NOPB equivalent, key selection criteria include its 1.6-MHz operation enabling compact magnetics, 40-V switch rating supporting ≥16-V outputs, cycle-by-cycle current limiting, and SOT-23-5 package compatibility with space-constrained designs.
Technical Context
The LM2733XMF/NOPB implements peak-current-mode control using an internal ramp generator and PWM comparator, where the switch current-sensed via the FET's RDS(ON)-directly modulates pulse width. Its fixed 1.6-MHz oscillator sets timing, while the feedback (FB) pin regulates output voltage via a resistive divider referenced to 1.23 V.
Shutdown is logic-level active-low (SHDN threshold: 0.5 V OFF / 1.5 V ON), drawing <1 µA in shutdown. Protection includes cycle-by-cycle current limiting (1 A min, duty-cycle dependent) and thermal shutdown, with internal compensation eliminating external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 1.6 MHz (typical); enables use of sub-2-mm inductors and 2.2-µF ceramic input capacitors. |
| Input voltage range | 2.7 V to 14 V; supports single-cell Li-ion, 3.3-V/5-V rails, and automotive cold-crank conditions. |
| Output capability | Up to 330 mA at 12 V (typical); limited by 1-A switch current and duty cycle-dependent derating. |
| FET voltage rating | 40 V; allows regulated outputs ≥16 V (e.g., 20–40 V for white LED strings). |
| 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 400 µA when not switching, extending battery life. |
| Shutdown current | <1 µA; enables ultra-low-power standby in portable systems. |
| RDS(ON) | 500–650 mΩ (25°C); determines conduction loss and thermal rise under load. |
Pinout & Package
LM2733XMF/NOPB uses a 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not electrically connected. Thermal resistance is RθJA = 210°C/W.
| 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. |
| GND (Pin 2) | Ground | Common analog and power return; must be low-impedance connection to minimize noise and thermal rise. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistive divider; regulates output by comparing to 1.23-V internal reference. |
| SHDN (Pin 4) | Shutdown control | Active-low enable; <0.5 V disables regulator and reduces IQ to <1 µA; tie to VIN if unused. |
| VIN (Pin 5) | Power input | Supplies internal circuitry and FET gate drive; requires local 2.2-µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40-V, 1-A DMOS switch | Eliminates external high-voltage MOSFET; supports ≥16-V outputs without external level-shifting. |
| Fixed 1.6-MHz switching | Reduces required inductor size to ~10 µH and capacitor size to 2.2–4.7 µF, minimizing PCB area. |
| Internal compensation | Removes need for external Type-II/III compensation network, simplifying layout and reducing BOM count. |
| Cycle-by-cycle current limiting | Protects against short-circuit and overload by terminating each switching cycle when peak current exceeds threshold. |
| Logic-level shutdown | Enables seamless integration with microcontroller GPIOs; <1 µA shutdown current extends battery runtime. |
| Thermal shutdown protection | Automatically disables output when junction temperature exceeds 125°C, preventing permanent damage. |
Applications
| White LED Backlighting | Portable Device Local Boost |
|---|---|
Use Scenario: Driving 3–6串联 white LEDs (9–24 V forward) from a 3.3-V or 5-V supply in smartphones or PDAs. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string voltage via FB-sensed current sense resistor. Use Value: Delivers stable 330 mA at 12 V with >85% efficiency, leveraging 1.6-MHz switching to minimize EMI-sensitive inductor size. | Use Scenario: Generating 12 V or 15 V from a 5-V rail to power analog sensors, op-amps, or RF modules in handheld instruments. IC Role / Device Role / Timing Role: Fixed-frequency boost regulator providing isolated higher-voltage rail with minimal external components. Use Value: Achieves 12-V/330-mA output using only one inductor, one Schottky diode (MBR0520), and two resistors-no compensation required. |
| Digital Camera Flash Charging | Industrial Sensor Bias Supply |
Use Scenario: Charging a 100-µF storage capacitor to 30–40 V for xenon flash discharge in compact digital cameras. IC Role / Device Role / Timing Role: High-voltage boost converter operating in discontinuous mode during charge cycles. Use Value: 40-V switch rating enables direct 40-V output; 1.6-MHz frequency allows fast charge times with small 10-µH inductor. | Use Scenario: Providing stable 20–30 V bias to piezoelectric transducers or photomultiplier tubes in industrial test equipment. IC Role / Device Role / Timing Role: Precision-regulated boost source with tight line/load regulation (±2.0% FB reference accuracy). Use Value: Maintains output within ±3% over 2.7–14-V input range and −40°C to +125°C, critical for sensor signal integrity. |
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 (≥22 µH) and capacitors. | Better suited for noise-sensitive audio or RF sections where lower EMI fundamental frequency is preferred. | Select when efficiency > size is prioritized and board space allows larger passives. |
| TPS61040DRVR | 500-kHz switching; integrated soft-start; 28-V switch; 400-mA typical output; different pinout and compensation scheme. | Designed for LCD bias and low-noise analog supplies; lacks 40-V rating for >28-V outputs. | Choose for applications needing soft-start or tighter output ripple, but verify 28-V limit vs. required output. |
Compared with LM2733YMF/NOPB, the LM2733XMF/NOPB trades ~3–5% efficiency for 60% smaller magnetics and lower EMI filter complexity; versus TPS61040DRVR, it offers higher output voltage headroom (40 V vs. 28 V) but no soft-start and requires external feedforward capacitor (Cf = 220 pF).
Availability
LM2733XMF/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, portable device local boost regulation, digital camera flash charging, and industrial sensor bias supply requiring stable component supply across production lifecycles.
Supply support for LM2733XMF/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 company delivering analog and embedded processing solutions, with leadership in power management ICs since the 1980s.
The LM2733 product line targets high-density, battery-powered portable electronics requiring compact, efficient DC-DC boost conversion with minimal external components and wide input voltage tolerance.
FAQ
What is the maximum output voltage achievable with LM2733XMF/NOPB?
The LM2733XMF/NOPB features a 40-V rated internal DMOS FET switch, enabling regulated output voltages up to 40 V. In practice, stable operation at 30–40 V is confirmed in TI's typical characteristics (Figures 15–17), provided external components-including the Schottky diode (e.g., MBR0540) and output capacitor-are rated accordingly. Output voltage is set by the FB divider ratio, with VOUT = 1.23 × (1 + R1/R2).
Does LM2733XMF/NOPB require external compensation components?
No, the LM2733XMF/NOPB is internally compensated and does not require external Type-II or Type-III compensation networks. However, a feedforward capacitor (Cf = 220 pF for "X" version) is mandatory across R1 for loop stability, as specified in TI's application note and typical application circuit. Omitting Cf causes oscillation and regulation failure.
What is the recommended inductor value for LM2733XMF/NOPB in a 5-V-to-12-V boost design?
Texas Instruments specifies 10 µH as the standard inductor value for 5-V-to-12-V boost operation with the LM2733XMF/NOPB. This value ensures continuous conduction mode at ≥33 mA load and maintains ≤100-mA inductor ripple current. Smaller values (e.g., 4.7 µH) may be used for size reduction but risk entering discontinuous mode and reduced load capability.
How does shutdown functionality work on LM2733XMF/NOPB?
The SHDN pin on LM2733XMF/NOPB is an active-low logic input. Pulling it below 0.5 V disables the regulator, reducing quiescent current to <1 µA. When pulled high to VIN (or ≥1.5 V), the device operates normally. TI recommends tying SHDN directly to VIN if unused; leaving it floating is prohibited. A 50–100-kΩ pullup resistor is advised when interfacing with open-drain controllers.
Can LM2733XMF/NOPB drive multiple white LEDs in series?
Yes, the LM2733XMF/NOPB is explicitly designed for white LED current-source applications. With its 40-V switch rating and ability to regulate output up to 40 V, it can drive 6–10 typical white LEDs (3.0–3.6 V each) in series. Current regulation is achieved by placing a sense resistor between the LED cathode and GND, connecting the FB pin to the resistor's LED-side node-configuring the IC as a constant-current sink.
LM2733XMF/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
LM2733XMF/NOPB FAQ
1.How can I place an order for LM2733XMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2733XMF/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 LM2733XMF/NOPB reliable?
The price and inventory of LM2733XMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2733XMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2733XMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2733XMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2733XMF/NOPB?
LM2733XMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2733XMF/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 LM2733XMF/NOPB?
For technical support, including LM2733XMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2733XMF/NOPB requirements.
6.How does Aetrix verify that LM2733XMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2733XMF/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 LM2733XMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2733XMF/NOPB?
All LM2733XMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2733XMF/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 LM2733XMF/NOPB part is unused and in its original packaging.
Return procedure for LM2733XMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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