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Texas Instruments LM2735YMYX/NOPB
- Part No.:
- LM2735YMYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2735YMYX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
LM2735YMYX/NOPB from Texas Instruments is a 520-kHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in a 5-pin SOT-23 package, supporting 2.7 V–5.5 V input and up to 24 V output with ±2% feedback voltage accuracy and 170-mΩ NMOS switch. It delivers up to 90% efficiency in portable LCD backlighting and USB-powered devices.
For engineers reviewing the LM2735YMYX/NOPB datasheet, LM2735YMYX/NOPB pinout, LM2735YMYX/NOPB application, or LM2735YMYX/NOPB equivalent, key selection criteria include switching frequency (520 kHz), internal soft start (4 ms), ultra-low shutdown current (80 nA), current-mode control architecture, and compatibility with small chip capacitors and surface-mount inductors.
Technical Context
The LM2735YMYX/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 520-kHz fixed switching frequency allows use of compact 10–15 µH inductors and ceramic output capacitors under 10 µF.
It integrates pulse-by-pulse current limiting (2.1 A min), thermal shutdown (160°C), and logic-high enable functionality. The device operates in continuous conduction mode (CCM) for boost topologies and supports SEPIC configurations via external component selection - all while maintaining 1.255-V nominal feedback reference with ±2% accuracy over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small 10–15 µH SMD inductors and reduces EMI filtering requirements |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads |
| Feedback Voltage | 1.255 V ±2% - sets precise output voltage via resistor divider; enables 3–24 V programmable output |
| Quiescent Current | 3.4 mA (active), 80 nA (shutdown) - extends battery life in portable systems during standby |
| RDS(ON) | 170 mΩ - minimizes conduction loss in low-duty-cycle boost applications |
| Soft Start Time | 4 ms - controls output ramp rate to limit inrush current into bulk capacitance |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - prevents erratic startup during brownout conditions |
Pinout & Package
LM2735YMYX/NOPB uses the DBV (SOT-23-5) package: 1.60 mm × 2.90 mm, 5-pin surface-mount, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node output | Connects directly to inductor and catch diode anode; carries high di/dt switching current |
| VIN | Power input | Supplies both control circuitry and power stage; requires local 22-µF ceramic bypass |
| EN | Enable control input | Logic-high (>1.8 V) enables regulation; floating or >VIN+0.3 V damages device |
| FB | Feedback sensing input | Monitors resistive divider from VOUT; sets output voltage per VFB = VOUT × R1/(R1+R2) |
| GND | Signal and power ground | Common return for FB divider, EN, and internal control; must be low-impedance path to PGND |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network - simplifies layout and reduces BOM count |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps |
| Ultra-Low Shutdown Current | 80 nA enables multi-week battery hold-up in always-on portable systems |
| Two Fixed Frequencies | 520 kHz option (LM2735Y) balances efficiency and size; avoids AM radio band interference |
| Thermal Shutdown Protection | 160°C junction cutoff with 10°C hysteresis prevents permanent damage during overload or poor heatsinking |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings in handheld tablets and e-readers requiring 12–20 V from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Boost regulator providing regulated high-voltage rail with tight output tolerance and low ripple. Use Value: Enables consistent brightness across display lifetime using only 5 external components and <100 mm² PCB area. | Use Scenario: Generating bias voltages (e.g., 15 V AVDD, –8 V VSS) for OLED pixel drivers in smartwatches and AR glasses. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating in discontinuous conduction mode (DCM) at light loads. Use Value: Achieves >85% efficiency at 10 mA load due to 80-nA shutdown and low RDS(ON), extending wearable battery runtime. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Up-converting 5 V USB supply to 9–12 V for optical zoom motors, flash LEDs, or sensor bias rails. IC Role / Device Role / Timing Role: Compact boost controller with fast enable/disable for burst-mode operation synchronized to camera shutter timing. Use Value: Delivers 500 mA peak current with <4-ms soft-start to prevent USB port overcurrent trips during motor activation. | Use Scenario: Powering CCD/CMOS image sensors and analog front-ends requiring clean, low-noise 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Low-noise, high-PSRR boost regulator supplying critical analog circuitry with minimal switching coupling. Use Value: Internal soft start and current-mode control suppress output voltage overshoot during sensor reset pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XMF/NOPB | 1.6-MHz switching frequency, higher quiescent current (7 mA active), same pinout and package | Better suited for space-constrained designs needing smaller inductors; lower efficiency at medium loads | Select when board area is critical and input voltage ≥3.3 V ensures stable 1.6-MHz operation |
| TPS61040DRVR | Fixed 500-kHz frequency, 0.5-A switch current, integrated Schottky diode, different pinout (6-pin WSON) | Limited to ≤15 V output and ≤200 mA load; simpler BOM but lower power capability | Choose for cost-sensitive, low-power applications where 2.1-A switch current is unnecessary |
Compared with LM2735XMF/NOPB, LM2735YMYX/NOPB trades higher efficiency at light-to-moderate loads for larger inductors; versus TPS61040DRVR, it provides 4.2× higher switch current and wider output voltage range but requires external diode and more careful layout for EMI control.
Availability
LM2735YMYX/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, USB-powered peripherals, and digital camera power management requiring stable component supply, long-term lifecycle support, and TI-qualified automotive-grade alternatives (LM2735-Q1).
Supply support for LM2735YMYX/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 delivering analog, embedded processing, and connectivity solutions with deep expertise in power management IC design and manufacturing.
The LM2735YMYX/NOPB belongs to TI's space-efficient DC/DC regulator product line, engineered specifically for portable and battery-powered applications demanding high efficiency, minimal external components, and robust thermal performance in ultra-small packages.
FAQ
What is the maximum output voltage achievable with LM2735YMYX/NOPB?
The LM2735YMYX/NOPB supports output voltages from 3 V to 24 V, set by an external resistor divider on the FB pin. At VIN = 5 V and VOUT = 24 V, duty cycle reaches ~80%, remaining within the 99% max duty cycle limit. Output stability and efficiency depend on proper inductor saturation rating and diode reverse voltage rating - TI recommends ≥30 V diodes for 24 V outputs. LM2735YMYX/NOPB maintains regulation across this full range when external components meet datasheet guidelines.
Does LM2735YMYX/NOPB require external compensation components?
No, LM2735YMYX/NOPB features fully internal compensation optimized for standard boost configurations. Unlike many current-mode controllers, it eliminates the need for external Type-II or Type-III compensation networks. Designers only select the FB divider, input/output capacitors, inductor, and catch diode - reducing BOM count and layout complexity. LM2735YMYX/NOPB achieves stable operation across input (2.7–5.5 V) and output (3–24 V) ranges without user-tuned compensation.
How does the enable pin (EN) function on LM2735YMYX/NOPB?
The EN pin on LM2735YMYX/NOPB is a logic-high enable input: applying ≥1.8 V activates regulation, while ≤0.4 V places the device in shutdown mode with 80-nA quiescent current. The pin must never float or exceed VIN + 0.3 V to avoid latch-up. TI specifies no pull-up/pull-down required - system MCU or PMIC can drive EN directly. During shutdown, SW goes high-impedance and FB is disabled, ensuring zero output current draw from the feedback network. LM2735YMYX/NOPB resumes regulation within 4 ms of EN assertion due to internal soft-start.
What thermal considerations apply to LM2735YMYX/NOPB in SOT-23-5 package?
LM2735YMYX/NOPB in the DBV (SOT-23-5) package has RθJA = 164.2°C/W and RθJB = 27°C/W. To maintain TJ ≤125°C at full 2.1-A switch current, PCB layout must include ≥2 cm² copper pour connected to GND pin with ≥4 thermal vias. Derating is required above 60°C ambient: at 85°C ambient, max continuous output current drops to ~1.3 A. Thermal shutdown triggers at 160°C with 10°C hysteresis. LM2735YMYX/NOPB's 170-mΩ RDS(ON) minimizes self-heating, but inductor proximity and airflow remain critical in sealed enclosures.
Can LM2735YMYX/NOPB be used in SEPIC topology?
Yes, LM2735YMYX/NOPB supports SEPIC configurations per TI's Application Report SLVA392. Its low-side NMOS switch and dedicated SW pin allow direct connection to the coupled inductor center tap. Key modifications include adding a series capacitor between SW and output, repositioning the catch diode, and adjusting the feedback divider for negative/positive dual-rail generation. SEPIC operation retains the same 520-kHz frequency, 2.1-A current limit, and internal compensation - but requires careful attention to AC coupling capacitor RMS current rating and transformer leakage inductance. LM2735YMYX/NOPB enables non-inverting buck-boost behavior ideal for battery-powered systems where VIN may dip below or rise above VOUT.
LM2735YMYX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8-HVSSOP
LM2735YMYX/NOPB FAQ
1.How can I place an order for LM2735YMYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YMYX/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 LM2735YMYX/NOPB reliable?
The price and inventory of LM2735YMYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YMYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YMYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YMYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YMYX/NOPB?
LM2735YMYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YMYX/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 LM2735YMYX/NOPB?
For technical support, including LM2735YMYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YMYX/NOPB requirements.
6.How does Aetrix verify that LM2735YMYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YMYX/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 LM2735YMYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YMYX/NOPB?
All LM2735YMYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YMYX/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 LM2735YMYX/NOPB part is unused and in its original packaging.
Return procedure for LM2735YMYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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