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Texas Instruments LM2735YQSDX/NOPB
- Part No.:
- LM2735YQSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2735YQSDX/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2735YQSDX/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, 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 LM2735YQSDX/NOPB datasheet, LM2735YQSDX/NOPB pinout, LM2735YQSDX/NOPB application, or LM2735YQSDX/NOPB equivalent, key selection criteria include switching frequency (520 kHz), internal compensation, soft-start timing (4 ms), thermal shutdown threshold (160°C), and WSON-6 package compatibility with space-constrained portable designs.
Technical Context
The LM2735YQSDX/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation using only five external components. Its 520-kHz fixed switching frequency allows use of compact 15–22 µH SMD inductors and chip capacitors while maintaining up to 90% efficiency at 350 mA output.
It integrates logic-high enable (EN) with 0.4 V shutdown threshold, pulse-by-pulse current limiting (2.1 A min), and thermal shutdown at 160°C with 10°C hysteresis. The 1.255-V reference voltage feeds an error amplifier that compares FB voltage against VREF to adjust duty cycle dynamically across input (2.7–5.5 V) and output (3–24 V) ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small 15–22 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 via resistor divider; ensures ≤±2% output regulation over temperature |
| RDS(ON) | 170 mΩ - minimizes conduction loss in internal NMOS switch; improves light-load efficiency |
| Shutdown Current | 80 nA - extends battery life in portable systems during standby mode |
| Soft-Start Time | 4 ms - controls output ramp rate to limit inrush current into output capacitance |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - prevents erratic startup/shutdown near battery depletion |
Pinout & Package
LM2735YQSDX/NOPB uses a 6-pin WSON (NGG) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP). Pin 1 is PGND, Pin 2 is VIN, Pin 3 is EN, Pin 4 is FB, Pin 5 is AGND, Pin 6 is SW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power ground | Return path for high-current switch node; must be connected to output capacitor ground with minimal trace length |
| VIN (Pin 2) | Input supply | Connects to 2.7–5.5 V source; requires local 22 µF ceramic input capacitor placed adjacent to this pin |
| EN (Pin 3) | Enable control | Logic-high active; must not exceed VIN + 0.3 V; floating state disables device |
| FB (Pin 4) | Feedback input | Connects to resistor divider from output; sets regulated voltage as VOUT = 1.255 × (1 + R1/R2) |
| AGND (Pin 5) | Analog ground | Reference for feedback network; place bottom resistor of divider directly between FB and AGND |
| SW (Pin 6) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring tight layout and ground shielding |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network; reduces BOM count and design iteration time |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps |
| Ultra-low shutdown current | 80 nA enables >1-year battery shelf life in always-on portable devices with periodic wake-up |
| Integrated soft start | 4 ms controlled output ramp prevents overshoot and limits stress on output capacitors and LEDs |
| Thermal shutdown with hysteresis | 160°C trip / 150°C recovery prevents latch-up and enables safe automatic recovery after overload |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings in handheld tablets and e-readers powered by single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Boost regulator generating 12–18 V from battery to bias LED current sources. Use Value: 520-kHz operation enables use of 15 µH inductors under 3 mm² footprint; 2.1-A switch handles peak LED surge currents without derating. | Use Scenario: Providing regulated 15–20 V bias for OLED display panels in smartwatches and AR glasses. IC Role / Device Role / Timing Role: SEPIC converter delivering stable output despite wide battery voltage swing (3.0–4.5 V). Use Value: Internal soft start prevents panel flicker at power-on; ±2% VFB accuracy maintains consistent brightness across temperature. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Generating 5 V or 12 V from 5 V USB host port to power sensors, audio codecs, or microcontrollers. IC Role / Device Role / Timing Role: Boost regulator with logic-enable control synchronized to USB enumeration sequence. Use Value: 80 nA shutdown current meets USB suspend power budget; 170-mΩ RDS(ON) sustains >85% efficiency at 200 mA load. | Use Scenario: Supplying flash LED driver voltage (up to 24 V) and sensor bias rails in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-output capable boost/SEPIC regulator supporting both high-voltage flash and low-noise analog rails. Use Value: 520-kHz switching avoids audible noise in image capture; thermal shutdown protects during rapid flash cycling. |
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 package but higher quiescent current (7 mA vs 3.4 mA) | Better suited for ultra-compact layouts requiring <10 µH inductors; less optimal for noise-sensitive audio sections | Select LM2735XMF/NOPB when board area is constrained and EMI filtering can accommodate 1.6 MHz harmonics. |
| TPS61040DRVR | Fixed 500-kHz frequency; 28-V max output; 0.5-A switch; no internal soft start; requires external compensation | Limited to lower output current; needs additional components for stability and sequencing | Choose TPS61040DRVR only if cost sensitivity outweighs design simplicity and 2.1-A capability is unnecessary. |
Compared with LM2735XMF/NOPB, LM2735YQSDX/NOPB offers lower quiescent current and reduced EMI at the expense of larger magnetics; versus TPS61040DRVR, it provides integrated compensation, soft start, and higher current capability-reducing total solution size and validation effort.
Availability
LM2735YQSDX/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, USB-powered peripherals, and digital camera power management requiring stable component supply and long-term industrial availability.
Supply support for LM2735YQSDX/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 and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM2735 product line delivers space-efficient, easy-to-use boost/SEPIC regulators targeting portable electronics where PCB area, battery life, and design simplicity are critical constraints.
FAQ
What is the switching frequency of the LM2735YQSDX/NOPB?
The LM2735YQSDX/NOPB operates at a fixed 520-kHz switching frequency. This value is factory-set and cannot be adjusted externally. It enables use of small surface-mount inductors (e.g., 15 µH) and ceramic capacitors while balancing efficiency, EMI, and thermal performance. The 520-kHz frequency is confirmed in the Electrical Characteristics table (FSW parameter) and distinguishes the 'Y' variant from the 1.6-MHz 'X' version. LM2735YQSDX/NOPB maintains this frequency across –40°C to 125°C junction temperature.
Does the LM2735YQSDX/NOPB require external compensation components?
No, the LM2735YQSDX/NOPB features fully internal compensation. Its current-mode control architecture and built-in compensation network eliminate the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and improves reliability. Layout best practices still apply-especially placing the feedback resistor divider close to AGND and FB pins-but no external compensation capacitor or resistor is required for stable operation across its specified input/output ranges. LM2735YQSDX/NOPB achieves this via optimized internal transconductance amplifier and slope compensation.
What is the maximum output voltage achievable with the LM2735YQSDX/NOPB?
The LM2735YQSDX/NOPB supports output voltages from 3 V up to 24 V, set by the external resistor divider connected to the FB pin. The upper limit is constrained by the absolute maximum SW pin voltage rating of 26.5 V and practical considerations like diode reverse voltage and capacitor ratings. At 24 V output, the device maintains regulation with input as low as 2.7 V in boost configuration. The 24-V maximum is explicitly stated in the Recommended Operating Conditions table and verified in typical application curves (e.g., Figure 5 and Figure 10). LM2735YQSDX/NOPB achieves this using its 170-mΩ NMOS switch and robust current-limit protection.
How does the enable (EN) pin function on the LM2735YQSDX/NOPB?
The EN pin on LM2735YQSDX/NOPB is a logic-high active enable input. Applying ≥1.8 V (minimum threshold) to EN turns the regulator on; pulling EN ≤0.4 V places the device in shutdown mode, reducing quiescent current to 80 nA. The pin must never float or exceed VIN + 0.3 V to avoid damage. Internal pull-down is not provided, so an external pull-down resistor is recommended if control logic is absent. This behavior is documented in the Pin Functions table and Electrical Characteristics (VEN_TH parameter). LM2735YQSDX/NOPB uses this pin for precise power sequencing in battery-powered systems.
Is the LM2735YQSDX/NOPB suitable for automotive applications?
No, the LM2735YQSDX/NOPB is not qualified for automotive use. It is rated for industrial temperature range (–40°C to 125°C) but lacks AEC-Q100 qualification, automotive-grade screening, or extended reliability testing. For automotive applications, Texas Instruments specifies the LM2735-Q1 variant, which undergoes full AEC-Q100 Grade 1 qualification and includes enhanced ESD robustness and failure reporting. LM2735YQSDX/NOPB datasheet explicitly directs automotive users to LM2735-Q1 in the Applications section. Using LM2735YQSDX/NOPB in automotive environments voids warranty and risks non-compliance with functional safety requirements.
LM2735YQSDX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2735YQSDX/NOPB FAQ
1.How can I place an order for LM2735YQSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YQSDX/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 LM2735YQSDX/NOPB reliable?
The price and inventory of LM2735YQSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YQSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YQSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YQSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YQSDX/NOPB?
LM2735YQSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YQSDX/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 LM2735YQSDX/NOPB?
For technical support, including LM2735YQSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YQSDX/NOPB requirements.
6.How does Aetrix verify that LM2735YQSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YQSDX/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 LM2735YQSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YQSDX/NOPB?
All LM2735YQSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YQSDX/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 LM2735YQSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2735YQSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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