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Texas Instruments LM2735YSDX/NOPB
- Part No.:
- LM2735YSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2735YSDX/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
LM2735YSDX/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 where compact size and ultra-low quiescent current are critical.
For engineers reviewing the LM2735YSDX/NOPB datasheet, LM2735YSDX/NOPB pinout, LM2735YSDX/NOPB application, or LM2735YSDX/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 LM2735YSDX/NOPB implements fixed-frequency current-mode control with internal compensation, enabling stable regulation using only five external components. Its 520-kHz oscillator sets timing for pulse-width modulation, while cycle-by-cycle current limiting protects the 170-mΩ NMOS switch across –40°C to 125°C.
It supports both boost and SEPIC topologies via single-inductor configuration, with soft-start ramping the 1.255-V reference over 4 ms to limit inrush. The device uses separate AGND and PGND pins to isolate analog and power return paths, minimizing noise coupling into the 0.1-µA feedback bias network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of ≤15 µH SMD inductors and chip capacitors for minimal board area |
| Peak Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads |
| Feedback Voltage | 1.255 V ±2% - sets output voltage via resistor divider; accuracy directly impacts output regulation error |
| Shutdown Current | 80 nA - preserves battery life in always-on portable systems during standby |
| 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 |
| Output Voltage Range | 3 V to 24 V - covers white LED string requirements (12–20 V) and OLED panel bias needs |
| Switch RDS(on) | 190 mΩ (typ) - limits conduction loss at full load; increases to 350 mΩ at 125°C |
Pinout & Package
LM2735YSDX/NOPB is housed in a 3.00 mm × 3.00 mm, 6-pin WSON package with exposed thermal pad (NGG). The package supports high-power dissipation via 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 |
| EN | Enable control | Logic-high active; float or >VIN+0.3 V violates absolute max rating |
| FB | Feedback input | Senses output via resistor divider; 0.1 µA bias current demands tight layout to AGND |
| AGND | Analog ground | Reference for FB and error amplifier; tie bottom resistor of divider directly to this pin |
| PGND | Power ground | Return path for switch current; connect to output capacitor ground with minimal loop area |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | Ramps reference voltage over 4 ms to limit inrush current and prevent output overshoot |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing |
| Two-frequency option | 520-kHz variant (Y) balances efficiency and component size; 1.6-MHz (X) enables smaller inductors |
| Ultra-low shutdown current | 80 nA ensures <1 µA total system standby draw-critical for multi-year battery operation |
| Thermal shutdown | Activates at 160°C junction temperature with 10°C hysteresis to prevent thermal runaway |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series from a 3.7-V Li-ion cell in handheld medical displays. IC Role / Device Role / Timing Role: Boost regulator generating 16–20 V at 20–30 mA per string with 520-kHz switching to minimize EMI in sensitive analog sections. Use Value: 90% peak efficiency at 20 V/25 mA reduces heat in sealed enclosures; WSON-6 footprint saves >30% board area vs. MSOP alternatives. | Use Scenario: Biasing RGB OLED subpixels in smartwatch displays requiring precise 12-V rail with low ripple. IC Role / Device Role / Timing Role: SEPIC converter delivering regulated 12 V from varying 3.0–4.2 V battery input, maintaining constant current drive under dimming control. Use Value: ±2% VFB accuracy ensures <±0.24 V output variation across temperature-critical for color fidelity. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering image sensor bias and flash LED drivers from 5-V USB-C ports in portable scanners. IC Role / Device Role / Timing Role: Boost converter stepping 5 V to 12 V at up to 350 mA, enabled only during active capture to conserve bus power. Use Value: 80 nA shutdown current prevents parasitic drain on host port; EN pin allows microcontroller-gated operation. | Use Scenario: Generating 18-V flash charging rail and 5-V logic supply from dual-cell 7.4-V LiPo in compact action cameras. IC Role / Device Role / Timing Role: Dual-output design using two LM2735YSDX/NOPB ICs-one for flash, one for core logic-with independent enable control. Use Value: 2.1-A switch current supports 1-A flash charge pulses; 520-kHz frequency avoids audible noise in audio-sensitive recording modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XSDX/NOPB | 1.6-MHz switching frequency; higher quiescent current (7 mA vs. 3.4 mA); same pinout and package | Better suited for ultra-compact designs needing <10 µH inductors; lower efficiency at light loads due to higher switching loss | Select when board area is constrained more than efficiency-e.g., wearables with <50 mm² available space |
| TPS61088RHLR | Higher 5-A switch current; 2.5-V to 12-V input; no SEPIC support; 20-pin QFN package | Targets high-current applications like tablet backlights; lacks SEPIC capability for buck-boost from wide-input sources | Choose when output current exceeds 350 mA or input range extends below 2.7 V-e.g., industrial sensors with 2.4-V minimum supply |
Compared with LM2735XSDX/NOPB, the LM2735YSDX/NOPB trades higher light-load efficiency and lower EMI for larger magnetics; versus TPS61088RHLR, it offers SEPIC topology and smaller footprint but lower current capability-making it optimal for space-limited, medium-current portable power rails.
Availability
LM2735YSDX/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, OLED panel power supplies, and USB-powered devices requiring stable component supply with long-term manufacturability.
Supply support for LM2735YSDX/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 headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The LM2735 product line delivers space-efficient, easy-to-use DC/DC regulators targeting portable and battery-operated systems where small solution size, low quiescent current, and robust thermal performance are essential.
FAQ
What is the maximum output voltage achievable with LM2735YSDX/NOPB?
The LM2735YSDX/NOPB supports output voltages from 3 V to 24 V, set by the external resistor divider on the FB pin. At VIN = 5 V and VOUT = 24 V, the duty cycle reaches ~79%, remaining within the 99% maximum limit specified for the Y-version. Output stability depends on proper compensation and inductor saturation rating-TI recommends verifying loop phase margin using WEBENCH Power Designer for each specific VOUT/VIN combination.
Does LM2735YSDX/NOPB support SEPIC topology, and what external components are required?
Yes, LM2735YSDX/NOPB supports SEPIC topology using a coupled inductor or two discrete inductors plus a coupling capacitor. Required components include: input capacitor (≥22 µF), output capacitor (≥10 µF), coupling capacitor (≥10 µF), catch diode (Schottky, ≥20 V), and feedback resistors. TI's Application Report SLVA392 provides validated SEPIC schematics and layout guidelines specifically for LM2735YSDX/NOPB.
How does the 520-kHz switching frequency of LM2735YSDX/NOPB impact component selection?
The 520-kHz frequency allows use of standard 10–22 µH SMD power inductors (e.g., Coilcraft MSS5131-153ML) and 10–22 µF X5R ceramic capacitors-reducing bill-of-materials cost and PCB area versus lower-frequency alternatives. It also places switching harmonics above AM radio bands (530–1710 kHz), easing EMI filtering. However, core losses increase vs. 100-kHz designs, so ferrite-core inductors with low DCR (<150 mΩ) are mandatory for >85% efficiency.
What is the thermal performance of LM2735YSDX/NOPB in the WSON-6 package?
In the NGG (WSON-6) package, LM2735YSDX/NOPB has a junction-to-ambient thermal resistance (RθJA) of 54.9°C/W on a 2-layer board and 29.3°C/W on a 4-layer board with thermal vias. With 1.5 W dissipation (e.g., 12 V/350 mA at 85% efficiency), junction temperature rise is ~44°C above ambient on a 4-layer board-well below the 160°C thermal shutdown threshold. TI recommends ≥4 thermal vias under the exposed pad connected to a solid ground plane.
Can LM2735YSDX/NOPB be used in automotive applications?
No-LM2735YSDX/NOPB is not qualified for automotive use. Texas Instruments offers the LM2735-Q1 variant, which is AEC-Q100 Grade 1 qualified (–40°C to +125°C), includes enhanced ESD protection (±3 kV HBM), and undergoes additional reliability testing. Using LM2735YSDX/NOPB in automotive environments voids warranty and risks premature failure due to unqualified temperature cycling and vibration performance.
LM2735YSDX/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)
LM2735YSDX/NOPB FAQ
1.How can I place an order for LM2735YSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YSDX/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 LM2735YSDX/NOPB reliable?
The price and inventory of LM2735YSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YSDX/NOPB?
LM2735YSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YSDX/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 LM2735YSDX/NOPB?
For technical support, including LM2735YSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YSDX/NOPB requirements.
6.How does Aetrix verify that LM2735YSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YSDX/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 LM2735YSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YSDX/NOPB?
All LM2735YSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YSDX/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 LM2735YSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2735YSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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