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Texas Instruments LMR10515XSDE/NOPB
- Part No.:
- LMR10515XSDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR10515XSDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:691
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Product details
Overview
LMR10515XSDE/NOPB from Texas Instruments is a monolithic 1.6-MHz, 1.5-A synchronous step-down DC/DC regulator in a 5-pin SOT-23 package, delivering regulated output voltages from 0.6 V to 4.5 V across 3 V–5.5 V input rails with internal PMOS switch (130 mΩ), current-mode PWM control, and integrated soft-start. It targets space-constrained point-of-load conversion in battery-powered instrumentation and industrial distributed power systems.
For engineers reviewing the LMR10515XSDE/NOPB datasheet, LMR10515XSDE/NOPB pinout, LMR10515XSDE/NOPB application, or LMR10515XSDE/NOPB equivalent, key selection considerations include its fixed 1.6-MHz switching frequency, 30 nA shutdown IQ, 0.6 V feedback reference, thermal shutdown at 165°C, and compatibility with ceramic output capacitors for low-ripple, high-transient-response regulation.
Technical Context
The LMR10515XSDE/NOPB implements current-mode PWM control with an internal 130 mΩ PMOS switch and artificial ramp compensation, enabling stable regulation with minimal external components. Its 1.6-MHz fixed-frequency oscillator supports ultra-small inductors and chip capacitors while maintaining up to 93% efficiency at full load.
Internally compensated architecture eliminates need for external loop compensation components; soft-start ramps VREF from 0 V to 0.6 V over ~600 µs to limit inrush current. Undervoltage lockout activates at 2.73 V (rising) with 430 mV hysteresis, and output overvoltage protection triggers when FB exceeds 15% above 0.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 5.5 V - supports direct regulation from standard 3.3-V and 5-V system rails without pre-regulation. |
| Output Voltage Range | 0.6 V to 4.5 V - set via external resistor divider on FB pin; enables core voltage scaling for MCUs, FPGAs, and analog ICs. |
| Max Output Current | 1.5 A - delivered continuously with internal 130-mΩ PMOS switch in SOT-23 package; peak switch current limit is 2.5 A (typ). |
| Switching Frequency | 1.6 MHz - fixed internal frequency enabling use of ≤1.0-µH inductors and 22-µF ceramic output capacitors for compact layout. |
| Feedback Reference | 0.600 V ±12 mV - precise internal reference ensures ±2% output accuracy over temperature and line/load conditions. |
| Shutdown Quiescent Current | 30 nA - ultra-low standby IQ extends battery life in always-on or sleep-mode portable applications. |
| Thermal Shutdown | 165°C - protects device under overload or poor PCB thermal design; auto-recovery at ~150°C junction temperature. |
Pinout & Package
LMR10515XSDE/NOPB uses the 5-pin SOT-23 (DBV) package (2.92 mm × 2.84 mm × 1.0 mm), optimized for high power density in space-constrained designs. Thermal performance is enhanced by mounting the exposed die pad (DAP) to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SW | Switch node | Connects to inductor and catch diode anode; carries high dv/dt switching waveform; requires short, low-inductance routing. |
| 2: GND | Signal and power ground | Primary return path for feedback network and internal circuitry; bottom resistor of FB divider must be placed adjacent to this pin. |
| 3: FB | Feedback input | Senses output voltage via resistor divider; high-impedance input (100 nA bias) minimizes divider current loss. |
| 4: EN | Enable control | Logic-high active enable; threshold is 1.8 V; must not float or exceed VIN + 0.3 V to avoid damage. |
| 5: VIN | Input supply | Power input for both control circuitry and internal PMOS switch; requires local 22-µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps reference voltage over ~600 µs to limit inrush current during power-up, reducing stress on input capacitors and source rail. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without requiring external compensation components. |
| Internally compensated | Eliminates need for external compensation network, simplifying design and reducing BOM count and board area. |
| Ultra-low shutdown IQ | 30 nA quiescent current enables >1-year battery life in coin-cell-powered devices operating in deep-sleep mode. |
| Output overvoltage protection | Shuts off internal PMOS if FB exceeds 0.69 V (15% above 0.6 V), preventing damage to downstream 1.8-V or 3.3-V logic. |
Applications
| Point-of-Load Conversion | Battery-Powered Instruments |
|---|---|
Use Scenario: Regulating 3.3-V or 5-V system rail down to 1.2 V or 1.8 V for MCU core supply in compact embedded controllers. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated, low-noise DC power with fast load transient response. Use Value: Enables use of small 1.0-µH inductors and 22-µF X7R MLCCs, reducing total solution size to <100 mm² while maintaining ±2% output accuracy. |
Use Scenario: Powering handheld test equipment (e.g., DMMs, oscilloscope probes) from single Li-ion or dual AA cells. IC Role / Device Role / Timing Role: Main DC/DC converter delivering 1.5 A at 3.3 V from 3.6–5.5 V battery input with ultra-low shutdown IQ. Use Value: 30 nA shutdown current extends shelf life and operational runtime; 1.6-MHz operation avoids audible noise and EMI in sensitive analog front-ends. |
| Industrial Distributed Power | Power Meters & Smart Sensors |
Use Scenario: Local regulation for isolated sensor nodes or PLC I/O modules powered from 24-V or 12-V field buses. IC Role / Device Role / Timing Role: High-efficiency buck converter converting intermediate 5-V rail to 3.3-V logic supply with thermal robustness. Use Value: 165°C thermal shutdown and -40°C to +125°C operating range ensure reliability in uncontrolled industrial environments. |
Use Scenario: Supplying metrology ASICs and RF transceivers in smart electricity/water meters with strict power budget constraints. IC Role / Device Role / Timing Role: Primary power stage delivering stable 1.8-V or 2.5-V supply with low output ripple (<10 mVpp) for precision ADCs. Use Value: Ceramic-capacitor-compatible design achieves <50 µVrms output noise; internal compensation ensures stability across wide temperature and load ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62172DSGR | 3-MHz switching frequency, 0.6-V reference, 2-A output, WSON-8 package; higher IQ in shutdown (1 µA vs. 30 nA). | Better suited for higher-current, ultra-compact designs where 3-MHz operation allows smaller passives; less optimal for ultra-low-power sleep modes. | Select TPS62172DSGR when >1.5-A output or faster transient response is required; verify thermal derating in SOT-23 footprint. |
| LMR10515YSDX/NOPB | Same SOT-23 package but 3-MHz switching frequency; identical pinout and FB/EN/VIN/SW/GND functions; 30-nA shutdown IQ retained. | Enables smaller inductors (e.g., 0.47 µH) and lower-profile capacitors; slightly reduced efficiency at light loads due to higher switching losses. | Choose LMR10515YSDX/NOPB when board area is more constrained than efficiency; confirm layout supports higher-frequency EMI filtering. |
Compared with LMR10515XSDE/NOPB, the TPS62172DSGR offers higher current and frequency but trades off 33× higher shutdown IQ, while the LMR10515YSDX/NOPB delivers identical functionality at 3 MHz-enabling further miniaturization without sacrificing low-power capability.
Availability
LMR10515XSDE/NOPB is available at Aetrix Electronics and suitable for point-of-load conversion, battery-powered instrumentation, and industrial distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMR10515XSDE/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 technologies, with decades of expertise in high-efficiency DC/DC conversion and industrial-grade reliability.
The LMR10515XSDE/NOPB belongs to TI's LMR family of monolithic step-down regulators designed specifically for space-constrained, high-density power delivery in portable, industrial, and metering applications where simplicity, thermal robustness, and low-quiescent-current operation are critical.
FAQ
What is the switching frequency of the LMR10515XSDE/NOPB?
The LMR10515XSDE/NOPB operates at a fixed internal switching frequency of 1.6 MHz. This frequency is factory-set and cannot be adjusted externally. It enables use of sub-1-µH inductors and small ceramic capacitors, supporting compact PCB layouts while maintaining up to 93% efficiency at full 1.5-A load. The 1.6-MHz frequency also avoids audible noise and simplifies EMI filtering compared to lower-frequency alternatives.
Does the LMR10515XSDE/NOPB require external compensation components?
No, the LMR10515XSDE/NOPB is internally compensated. Its control loop is fully optimized for stability with only two external components: the feedback resistor divider and output capacitor. This eliminates the need for external compensation networks (e.g., RC filters or type-II/III compensators), reducing design complexity, BOM cost, and board area-making it ideal for rapid prototyping and space-constrained applications.
What is the maximum output current capability of the LMR10515XSDE/NOPB?
The LMR10515XSDE/NOPB delivers up to 1.5 A of continuous output current using its integrated 130-mΩ PMOS switch in the SOT-23 package. Peak switch current limit is specified at 1.8 A (min) and 2.5 A (typ). Actual achievable output current depends on ambient temperature, PCB copper area, and thermal management; derating is required above 85°C ambient to maintain safe junction temperature below 125°C.
How does the LMR10515XSDE/NOPB handle thermal overload conditions?
The LMR10515XSDE/NOPB includes thermal shutdown protection that disables the internal PMOS switch when junction temperature exceeds 165°C. Operation resumes automatically once the die cools to approximately 150°C. This feature prevents permanent damage during sustained overload, poor heatsinking, or high ambient temperatures. For reliable continuous operation, PCB layout must provide adequate thermal relief-especially via the exposed DAP connected to a solid ground plane.
Can the LMR10515XSDE/NOPB be used with ceramic output capacitors?
Yes, the LMR10515XSDE/NOPB is fully compatible with ceramic output capacitors-including X7R and X5R MLCCs-and is optimized for them. Its internally compensated current-mode architecture ensures stability with low-ESR ceramics, enabling low-output-ripple designs (<10 mVpp) and excellent transient response. Recommended minimum output capacitance is 22 µF; increasing capacitance improves load-step response without compromising stability.
LMR10515XSDE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 1.5A
- 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)
LMR10515XSDE/NOPB FAQ
1.How can I place an order for LMR10515XSDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515XSDE/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 LMR10515XSDE/NOPB reliable?
The price and inventory of LMR10515XSDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515XSDE/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515XSDE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515XSDE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515XSDE/NOPB?
LMR10515XSDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515XSDE/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 LMR10515XSDE/NOPB?
For technical support, including LMR10515XSDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515XSDE/NOPB requirements.
6.How does Aetrix verify that LMR10515XSDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515XSDE/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 LMR10515XSDE/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515XSDE/NOPB?
All LMR10515XSDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515XSDE/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 LMR10515XSDE/NOPB part is unused and in its original packaging.
Return procedure for LMR10515XSDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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