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Texas Instruments LM2735XSDX/NOPB
- Part No.:
- LM2735XSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2735XSDX/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
LM2735XSDX/NOPB from Texas Instruments is a 1.6-MHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in a 6-pin WSON package, supporting 2.7–5.5 V input and up to 24 V output with ±2% feedback accuracy and 80 nA shutdown current. It delivers up to 90% efficiency in space-constrained portable backlighting and USB-powered applications.
For engineers reviewing the LM2735XSDX/NOPB datasheet, LM2735XSDX/NOPB pinout, LM2735XSDX/NOPB application, or LM2735XSDX/NOPB equivalent, key selection criteria include switching frequency (1.6 MHz), internal compensation, soft-start timing (4 ms), NMOS RDS(ON) (190 mΩ at 25°C), and thermal shutdown (160°C).
Technical Context
The LM2735XSDX/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation without external loop components. Its 1.6-MHz oscillator allows use of sub-2.2-µH inductors and chip-scale capacitors while maintaining fast transient response.
It integrates pulse-by-pulse current limiting (2.1 A min), thermal shutdown (160°C with 10°C hysteresis), and logic-high enable with 0.4 V shutdown threshold. The feedback reference is trimmed to 1.255 V with ±2% accuracy over –40°C to 125°C for WSON packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤2.2 µH SMD inductors and reduces solution footprint by >40% vs 520-kHz variants |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads in boost configurations |
| RDS(ON) | 190 mΩ (25°C) - limits conduction loss to <120 mW at 1 A, critical for thermal performance in WSON-6 |
| VFB Accuracy | ±2% (0°C to 125°C) - ensures output voltage stability across temperature without trimming resistors |
| Shutdown Current | 80 nA - extends battery life in always-on portable systems requiring ultra-low quiescent power |
| Soft Start Time | 4 ms - controls inrush current during startup, preventing input rail sag and capacitor stress |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - prevents erratic operation during brownout conditions in Li-ion and USB-powered systems |
Pinout & Package
The LM2735XSDX/NOPB is housed in a 3.0 mm × 3.0 mm, 0.8-mm height, 6-pin WSON (NGG) package with exposed thermal pad (DAP) connected to PGND. Thermal vias under the DAP are required for reliable operation above 1 W dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGND | Power ground | Low-impedance return path for switch current; must be tied directly to DAP and output capacitor GND |
| 2 - VIN | Input supply | Primary power input (2.7–5.5 V); requires local 22-µF ceramic bypass within 3 mm |
| 3 - EN | Enable control | Logic-high active; 0.4 V threshold ensures compatibility with 1.8-V/3.3-V GPIO; must not exceed VIN + 0.3 V |
| 4 - FB | Feedback input | Resistor-divider node for output voltage setting; high-impedance (0.1 µA bias) to minimize divider error |
| 5 - SW | Switch output | Drives external inductor/diode; swings from GND to VOUT + VF; requires short, low-inductance routing |
| 6 - AGND | Analog ground | Reference for FB and error amplifier; must be star-connected near FB resistor divider, separate from PGND |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity in 1.6-MHz designs |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast load-transient response (<10 µs settling) |
| Ultra-Low Shutdown Current | 80 nA enables multi-year battery life in IoT sensors and always-on display controllers |
| 1.6-MHz Fixed Frequency | Allows use of 1.0–2.2 µH inductors and 10–22 µF output capacitors-cuts total solution area by ~35% vs 520-kHz alternatives |
| Thermal Shutdown with Hysteresis | 160°C trip / 150°C recovery prevents thermal runaway while avoiding oscillation near thermal limit |
Applications
| LCD Backlight Power Supply | OLED Panel Bias |
|---|---|
Use Scenario: Driving white LED strings in handheld medical monitors and industrial HMIs powered from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Boost regulator generating 12–24 V from 3.3 V rail; operates at 1.6 MHz to avoid AM radio band interference. Use Value: 90% peak efficiency at 350 mA enables compact thermal design; internal soft start prevents LED flash during power-up. | Use Scenario: Providing regulated 15 V bias for OLED pixel drivers in portable AR glasses with tight board space constraints. IC Role / Device Role / Timing Role: SEPIC converter delivering stable output despite input droop during RF transmission bursts. Use Value: 2.1-A switch current handles dynamic load steps; ±2% VFB accuracy maintains display uniformity across temperature. |
| USB-Powered Test Equipment | Digital Camera Flash Driver |
Use Scenario: Generating 5 V and 12 V rails from USB 5 V input for portable oscilloscope front-end circuitry. IC Role / Device Role / Timing Role: Dual-output boost/SEPIC controller; uses EN pin for synchronized power sequencing with MCU. Use Value: 80 nA shutdown current meets USB suspend mode leakage requirements; 1.6-MHz operation minimizes EMI filtering complexity. | Use Scenario: Charging high-voltage capacitor for xenon flash in compact action cameras using 3.7 V battery input. IC Role / Device Role / Timing Role: High-current boost stage charging 330-V capacitor bank; duty cycle limited to 96% for safety margin. Use Value: 190-mΩ RDS(ON) reduces charge time by 12% vs 520-kHz variant; thermal shutdown protects during repeated flash cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735YMF/NOPB | 520-kHz switching frequency; 170-mΩ RDS(ON) (SOT-23); 5-pin package | Better efficiency at medium loads (>200 mA); larger inductor/capacitor footprint required | Select when lower EMI or higher efficiency at 100–500 mA is prioritized over board area |
| TPS61040DRVR | 1-MHz fixed frequency; 0.5-A switch; 6-pin WSON; no internal compensation | Limited to ≤15 V output; requires external compensation; lower current capability | Choose for cost-sensitive, low-power (<150 mA) applications where 1-MHz frequency suffices |
Compared with LM2735YMF/NOPB, the LM2735XSDX/NOPB trades slightly higher conduction loss for 3× smaller passive components and better high-frequency noise immunity; versus TPS61040DRVR, it offers 4.2× higher current, integrated compensation, and wider output range-making it suitable for demanding portable power rails.
Availability
LM2735XSDX/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, OLED panel bias, and USB-powered test equipment requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade alternatives (LM2735-Q1).
Supply support for LM2735XSDX/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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC/DC conversion.
The LM2735 product line was designed specifically for space-constrained portable electronics requiring high-frequency, low-quiescent-current boost/SEPIC regulation-targeting display, imaging, and battery-powered instrumentation markets.
FAQ
What is the maximum output voltage supported by the LM2735XSDX/NOPB?
The LM2735XSDX/NOPB supports output voltages from 3 V to 24 V, set via an external resistor divider on the FB pin. The 24-V absolute maximum is validated per the datasheet's recommended operating conditions and electrical characteristics tables, with SW pin rated to 26.5 V for transient margin.
Does the LM2735XSDX/NOPB require external compensation components?
No, the LM2735XSDX/NOPB features fully internal compensation optimized for 1.6-MHz operation. Unlike many boost controllers, it eliminates the need for external Type-II or Type-III compensation networks-reducing component count and layout sensitivity while maintaining stability across all valid input/output combinations.
What package type and thermal characteristics apply to the LM2735XSDX/NOPB?
The LM2735XSDX/NOPB uses the NGG (6-pin WSON) package: 3.0 mm × 3.0 mm body with exposed thermal pad (DAP). Its junction-to-board thermal resistance (RθJB) is 29.3°C/W, and recommended layout includes 4–6 thermal vias from DAP to inner ground plane to sustain >1 W continuous power dissipation.
How does the enable (EN) pin function on the LM2735XSDX/NOPB?
The EN pin on the LM2735XSDX/NOPB is logic-high active with a 0.4-V threshold for disable and 1.8-V minimum for enable. When pulled low, the device enters shutdown mode drawing only 80 nA quiescent current. The pin must never exceed VIN + 0.3 V to prevent damage, and floating is prohibited per datasheet guidance.
Can the LM2735XSDX/NOPB be used in SEPIC topology, and what design considerations apply?
Yes, the LM2735XSDX/NOPB supports SEPIC operation per its functional description and typical application circuits. Key considerations include using coupled inductors or two matched discrete inductors, ensuring the catch diode and output capacitor ratings exceed the sum of input and output voltages, and verifying loop stability with the internal compensation-no additional components are needed.
LM2735XSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 2.1A (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2735XSDX/NOPB FAQ
1.How can I place an order for LM2735XSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735XSDX/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 LM2735XSDX/NOPB reliable?
The price and inventory of LM2735XSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735XSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735XSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735XSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735XSDX/NOPB?
LM2735XSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735XSDX/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 LM2735XSDX/NOPB?
For technical support, including LM2735XSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735XSDX/NOPB requirements.
6.How does Aetrix verify that LM2735XSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735XSDX/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 LM2735XSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735XSDX/NOPB?
All LM2735XSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735XSDX/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 LM2735XSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2735XSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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