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Texas Instruments LM2735YSD/NOPB
- Part No.:
- LM2735YSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2735YSD/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
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Product details
Overview
LM2735YSD/NOPB from Texas Instruments is a 520-kHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in a 6-pin WSON package. It operates from 2.7 V to 5.5 V input, delivers up to 24 V output, features ±2% feedback voltage accuracy (1.255 V nominal), 170-mΩ NMOS switch, and 80 nA shutdown current. It is used in portable LCD backlighting and USB-powered white LED drivers.
For engineers reviewing the LM2735YSD/NOPB datasheet, LM2735YSD/NOPB pinout, LM2735YSD/NOPB application, or LM2735YSD/NOPB equivalent, key selection criteria include switching frequency (520 kHz), peak switch current (2.1 A), feedback reference tolerance (±2%), thermal shutdown threshold (160°C), and WSON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM2735YSD/NOPB implements fixed-frequency current-mode control with internal compensation, enabling stable regulation using only five external components. Its 520-kHz oscillator allows use of compact 15-µH SMD inductors and chip capacitors while maintaining up to 90% efficiency at 12-V output.
It integrates soft-start (4-ms ramp), pulse-by-pulse current limiting, undervoltage lockout (2.3 V rising), and thermal shutdown (160°C with 10°C hysteresis). The device uses a single NMOS switch with 170-mΩ RDS(ON) at 25°C and supports both boost and SEPIC topologies via external component configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small 10–22 µH inductors and reduces EMI filtering requirements |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V in boost configuration with margin for transients |
| Feedback Voltage | 1.255 V ±2% - sets output voltage via resistor divider; accuracy ensures stable regulation across temperature |
| RDS(ON) | 170 mΩ - limits conduction loss in NMOS switch; contributes to >85% efficiency at mid-load |
| Shutdown Current | 80 nA - minimizes battery drain in portable standby mode; compatible with always-on system monitoring |
| Input Voltage Range | 2.7 V to 5.5 V - matches single-cell Li-ion (3.0–4.2 V) and USB 5-V supply rails without pre-regulation |
| Output Voltage Range | 3 V to 24 V - configurable via FB resistor network; supports white LED strings and OLED panel bias rails |
Pinout & Package
LM2735YSD/NOPB is housed in a 3.00 mm × 3.00 mm, 6-pin WSON package with exposed thermal pad (NGG suffix). The package supports high-power density layout with bottom-side thermal vias to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies power stage; must be decoupled with ≥22 µF X5R ceramic capacitor near pin |
| SW | Switch node | Connects to inductor and catch diode anode; requires short, low-inductance trace to minimize ringing |
| FB | Feedback input | Senses output voltage via resistor divider; high-impedance node-keep routing away from noise sources |
| EN | Enable control | Logic-high active; 0.4 V threshold ensures reliable startup from weak microcontroller GPIOs |
| AGND | Analog ground | Reference for FB and error amplifier; connect to PGND at single point near IC to avoid noise coupling |
| PGND | Power ground | Return path for switch current; tie directly to thermal pad and output capacitor cathode |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp prevents inrush current into large output capacitors and avoids system brownout |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle overcurrent protection without external sensing |
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and design iteration time |
| Two-frequency option | 520-kHz version (Y) balances efficiency and size; 1.6-MHz (X) enables ultra-compact designs with <10-µH inductors |
| Thermal shutdown | 160°C trip with 10°C hysteresis protects against sustained overload or poor heatsinking in sealed enclosures |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving 4–6 series white LEDs from a 3.7-V Li-ion battery in handheld medical displays. IC Role / Device Role / Timing Role: Boost regulator generating 18–22 V at 20–30 mA per string with constant-current sink control. Use Value: 520-kHz operation allows use of 15-µH shielded inductor occupying <3 mm² PCB area; 80-nA shutdown extends battery life during display-off periods. | Use Scenario: Providing regulated 15-V bias for OLED source driver ICs in smartwatch displays. IC Role / Device Role / Timing Role: SEPIC converter delivering stable output despite battery voltage sag below LED forward voltage. Use Value: ±2% VFB accuracy maintains consistent OLED brightness across temperature; internal soft start prevents panel flash at power-on. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Generating 12-V rail from 5-V USB port to power optical zoom actuators and image sensor bias. IC Role / Device Role / Timing Role: Compact boost converter with logic-enable interface synchronized to host USB enumeration. Use Value: WSON-6 footprint fits within 5-mm margin of USB-C connector; EN pin allows precise power sequencing controlled by USB PD controller. | Use Scenario: Supplying 20-V flash LED driver rail and 3.3-V logic rail from dual-cell 7.4-V LiPo battery in compact action cameras. IC Role / Device Role / Timing Role: Primary boost stage feeding secondary LDOs; configured for 20-V output with tight line/load regulation. Use Value: 170-mΩ RDS(ON) and current-mode control deliver <1% output deviation across 0–100 mA load step; thermal shutdown prevents lens motor stall damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XMF/NOPB | 1.6-MHz switching frequency; same pinout and features but higher quiescent current (7 mA vs 3.4 mA) | Better suited for ultra-small form factor where inductor size is critical; lower efficiency at light loads due to higher switching loss | Select when board area is constrained below 12 mm² and 520-kHz EMI cannot be filtered effectively |
| TPS61040DRVR | Fixed 500-kHz frequency; 28-V max output; 1.3-A switch; no internal soft start or thermal shutdown | Lacks integrated protection features; requires external soft-start circuit and thermal monitoring for robust operation | Choose when cost sensitivity outweighs reliability requirements and design team has experience adding discrete protection |
Compared with LM2735YSD/NOPB, the LM2735XMF/NOPB trades higher-frequency operation for reduced solution size but sacrifices light-load efficiency, while the TPS61040DRVR offers lower cost at the expense of missing key safety features-making LM2735YSD/NOPB optimal for production-grade portable systems requiring validated protection and minimal external components.
Availability
LM2735YSD/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, USB-powered devices, and digital camera power management requiring stable component supply across long production cycles.
Supply support for LM2735YSD/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 specializing in analog and embedded processing solutions, with leadership in power management ICs for portable and industrial applications.
The LM2735 product line delivers space-efficient, easy-to-use boost/SEPIC regulators targeting battery-powered consumer electronics where PCB area, efficiency, and design simplicity are critical.
FAQ
What is the maximum output voltage achievable with LM2735YSD/NOPB?
The LM2735YSD/NOPB supports output voltages from 3 V to 24 V, set externally via the FB resistor divider. At 5-V input and 12-V output, typical efficiency exceeds 88%; at 24-V output, efficiency drops to ~78% due to increased duty cycle and conduction losses. Output stability is maintained across full load and temperature range when layout guidelines are followed.
Does LM2735YSD/NOPB require external compensation components?
No, LM2735YSD/NOPB includes internal compensation optimized for standard boost configurations. External compensation (e.g., C3 in R2–C3 network) is optional and only needed for specialized SEPIC designs or when optimizing phase margin beyond default performance. The internal scheme eliminates four passive components versus competing controllers.
How does the enable (EN) pin function on LM2735YSD/NOPB?
The EN pin on LM2735YSD/NOPB is active-high with 0.4-V threshold. Applying logic high (>1.8 V) enables regulation; pulling below 0.4 V places LM2735YSD/NOPB in shutdown, reducing total supply current to 80 nA. The pin must never exceed VIN + 0.3 V to prevent damage, and floating is prohibited-tie to GND or MCU GPIO with pull-down if unused.
Can LM2735YSD/NOPB be used in SEPIC topology?
Yes, LM2735YSD/NOPB supports SEPIC operation using the same external components as boost mode, with minor reconfiguration of the inductor and capacitor connections. TI provides reference schematics and WEBENCH® models for SEPIC designs. Key considerations include ensuring coupled inductor saturation current rating exceeds 2.1 A peak and selecting low-ESR output capacitors rated for 2× output voltage.
What thermal management guidance applies to LM2735YSD/NOPB in WSON-6 package?
LM2735YSD/NOPB in WSON-6 (NGG) has RθJA = 54.9°C/W. To maintain TJ < 125°C at 1.5-W dissipation, use ≥4 thermal vias under the exposed pad connected to a 2-oz internal ground plane. Avoid placing copper pours over top surface; keep SW and VIN traces short and wide. Thermal shutdown activates at 160°C with 10°C hysteresis to prevent oscillation.
LM2735YSD/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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2735YSD/NOPB FAQ
1.How can I place an order for LM2735YSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YSD/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 LM2735YSD/NOPB reliable?
The price and inventory of LM2735YSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YSD/NOPB?
LM2735YSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YSD/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 LM2735YSD/NOPB?
For technical support, including LM2735YSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YSD/NOPB requirements.
6.How does Aetrix verify that LM2735YSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YSD/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 LM2735YSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YSD/NOPB?
All LM2735YSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YSD/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 LM2735YSD/NOPB part is unused and in its original packaging.
Return procedure for LM2735YSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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