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Texas Instruments LMR10515XSD/NOPB
- Part No.:
- LMR10515XSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR10515XSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
LMR10515XSD/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 0.6 V to 4.5 V output from 3 V–5.5 V input with internal PMOS switch (130 mΩ), current-mode PWM control, and internal compensation - used for point-of-load conversion in space-constrained battery-powered instruments and industrial power meters.
For engineers reviewing the LMR10515XSD/NOPB datasheet, LMR10515XSD/NOPB pinout, LMR10515XSD/NOPB application, or LMR10515XSD/NOPB equivalent, key selection criteria include verified 1.6-MHz switching frequency, confirmed 30 nA shutdown IQ, validated 0.600 V feedback reference, documented thermal shutdown at 165°C, and confirmed SOT-23 (2.92 × 2.84 × 1 mm) mechanical compatibility.
Technical Context
The LMR10515XSD/NOPB implements fixed-frequency current-mode PWM control with an internally compensated error amplifier and 30 ns minimum on-time capability, enabling stable regulation down to 0.6 V output across its 3 V–5.5 V input range. Its integrated 130 mΩ PMOS switch and pulse-by-pulse current limiting (1.8 A min / 2.5 A typ) support high-power-density 1.5-A load delivery without external MOSFETs.
It features undervoltage lockout with 2.73 V rising threshold and 430 mV hysteresis, internal soft-start with ~600 µs ramp time, and output overvoltage protection triggered at FB = 1.15 × VREF. The device operates with no external compensation components and supports ceramic output capacitors exclusively due to high-frequency operation.
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 rails without pre-regulation. |
| Output Voltage Range | 0.6 V to 4.5 V - set via external resistor divider; 0.600 V ±2% feedback reference enables precise low-voltage core supply generation. |
| Max Output Current | 1.5 A - delivered continuously with internal 130 mΩ PMOS switch; peak switch current limit ≥1.8 A ensures robust overload handling. |
| Switching Frequency | 1.6 MHz (fixed) - enables use of sub-2.2-µH inductors and 10–22-µF ceramic capacitors, minimizing solution footprint. |
| Shutdown Quiescent Current | 30 nA typical - preserves battery life in always-on or sleep-mode applications such as portable handheld instruments. |
| Thermal Shutdown Threshold | 165°C - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C junction temperature. |
| Feedback Voltage Accuracy | 0.588 V to 0.612 V (±2%) - ensures tight output regulation across temperature and line variations without trimming. |
Pinout & Package
LMR10515XSD/NOPB uses the 5-pin SOT-23 package (2.92 mm × 2.84 mm × 1.0 mm) with exposed pad not connected internally; thermal performance relies on PCB copper area under the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Connects directly to inductor and catch diode cathode; carries high dv/dt switching waveform - requires short, low-inductance layout. |
| 2 - GND | Signal and power ground | Primary return path for feedback network and internal circuitry; bottom resistor of FB divider must connect here with minimal trace length. |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; high-impedance (≤100 nA bias) node - sensitive to noise and layout parasitics. |
| 4 - EN | Enable control | Active-high logic input; must be driven ≥1.8 V to enable, ≤0.4 V to shut down; floating state disables regulator. |
| 5 - VIN | Power input supply | Supplies both control circuitry and internal PMOS switch; requires local 22-µF ceramic input capacitor with low ESL. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and layout sensitivity while maintaining stability with 22-µF ceramic output capacitance. |
| 1.6-MHz fixed switching frequency | Enables full utilization of small-size, high-SRF ceramic inductors (e.g., 1.0–2.2 µH) and avoids audible noise in portable equipment. |
| Internal soft-start (600 µs) | Controls output voltage ramp rate to limit inrush current into downstream capacitance - prevents input rail droop and system brownout. |
| Current-mode PWM architecture | Provides inherent cycle-by-cycle overcurrent protection and fast transient response (<10 µs) to load steps without external sensing. |
| Ultra-low shutdown IQ (30 nA) | Extends battery runtime in standby mode - critical for metering and handheld instrumentation requiring multi-year operation on coin cells. |
Applications
| Point-of-Load Conversion | Battery-Powered Instruments |
|---|---|
|
Use Scenario: Regulating 3.3-V or 5-V system rail to 1.2-V or 1.8-V FPGA/core voltage in compact embedded controllers. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated, low-noise DC supply with fast transient response. Use Value: Delivers 1.5-A continuous current in <15 mm² total solution size using only 1 inductor, 2 capacitors, and 2 resistors - no compensation required. |
Use Scenario: Powering microcontroller, display, and sensor subsystems in handheld multimeters or portable gas analyzers. IC Role / Device Role / Timing Role: Main DC/DC converter managing battery-to-load power conversion with ultra-low shutdown IQ. Use Value: Achieves >90% efficiency at 500-mA load and draws only 30 nA in shutdown - extends alkaline/coin-cell life by years. |
| Industrial Power Meters | Space-Constrained Industrial Modules |
|
Use Scenario: Generating isolated auxiliary supplies for metrology ADCs and communication interfaces in DIN-rail mounted energy meters. IC Role / Device Role / Timing Role: High-reliability, thermally robust local regulator operating across −40°C to +125°C ambient. Use Value: Thermal shutdown at 165°C and guaranteed operation to 125°C junction temperature ensure field reliability under sealed enclosure conditions. |
Use Scenario: Replacing discrete buck solutions in PLC I/O modules where PCB real estate is limited to <200 mm² per channel. IC Role / Device Role / Timing Role: Integrated power stage eliminating external MOSFETs, drivers, and compensation components. Use Value: Reduces component count by ≥7 parts versus discrete alternatives while maintaining 93% peak efficiency and 30-ns minimum on-time capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3-MHz switching frequency, 3-A output, 2.5-V to 5.5-V input, 0.6-V reference; uses different pinout (6-pin WQFN) and requires external compensation. | Better suited for higher-current, faster-transient applications but increases layout complexity and BOM cost. | Select when >1.5-A output or faster load-step response is required; verify PCB redesign for non-pin-compatible layout. |
| LMR10515YSD/NOPB | Same SOT-23 package and pinout, but 3-MHz switching frequency, higher quiescent current (4.3 mA typ), and reduced max duty cycle (82% vs 86%). | Optimized for ultra-small inductors in noise-sensitive RF sections; trades efficiency at light loads for smaller magnetics. | Choose for designs prioritizing minimal inductor size over light-load efficiency - no PCB change needed due to identical pinout and footprint. |
Compared with TPS62130ARGTR, LMR10515XSD/NOPB offers simpler layout and lower BOM count at 1.5-A rating, while LMR10515YSD/NOPB provides a drop-in frequency upgrade without altering board space or routing - making it the only true pin-compatible alternative.
Availability
LMR10515XSD/NOPB is available at Aetrix Electronics and suitable for point-of-load conversions, battery-powered instrumentation, and industrial power metering requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production lots.
Supply support for LMR10515XSD/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, embedded processing, and power management ICs, with leadership in high-efficiency DC/DC conversion and automotive-grade reliability.
The LMR10515XSD/NOPB belongs to TI's LMR family of monolithic step-down regulators designed for space-constrained, high-power-density applications in portable, industrial, and metering systems where minimal external components and guaranteed thermal performance are essential.
FAQ
What is the switching frequency of the LMR10515XSD/NOPB?
The LMR10515XSD/NOPB operates at a fixed 1.6-MHz switching frequency, as confirmed in the Electrical Characteristics table (FSW = 1.2–1.95 MHz, typical 1.6 MHz). This frequency is factory-trimmed and not user-adjustable. It enables compact magnetic design with standard 1.0–2.2-µH shielded inductors and eliminates need for external frequency-setting components - a key differentiator from adjustable-frequency alternatives like the TPS62130ARGTR.
Does the LMR10515XSD/NOPB require external compensation components?
No, the LMR10515XSD/NOPB is internally compensated, as explicitly stated in the Features and Description sections. Its control loop is optimized for stability with ≥22-µF ceramic output capacitance and does not require external Type-II or Type-III compensation networks. This eliminates two to four passive components, reduces layout sensitivity, and accelerates design validation - confirmed by TI's WEBENCH® Power Designer model and typical application schematic (Figure 15).
What is the maximum output current capability of the LMR10515XSD/NOPB?
The LMR10515XSD/NOPB delivers up to 1.5 A of continuous output current under recommended operating conditions (VIN = 3 V–5.5 V, TJ ≤ 125°C), enabled by its integrated 130-mΩ PMOS switch. The datasheet specifies a minimum current limit of 1.8 A and typical limit of 2.5 A, ensuring safe operation during transient overloads. Performance is validated across temperature with no derating required below 125°C junction temperature.
How does the LMR10515XSD/NOPB handle thermal overload?
The LMR10515XSD/NOPB incorporates thermal shutdown that activates at 165°C junction temperature (TSD), turning off the internal PMOS switch until the die cools to approximately 150°C. This behavior is tested and guaranteed per Absolute Maximum Ratings. Unlike foldback or hiccup modes, it provides hard shutdown with automatic recovery - protecting both the IC and downstream circuitry during sustained overload or inadequate PCB thermal design.
Can the LMR10515XSD/NOPB be used with ceramic output capacitors only?
Yes, the LMR10515XSD/NOPB is specifically designed for ceramic output capacitors, as emphasized in Section 9.2.1.4. Its 1.6-MHz operation and internal compensation ensure stability with ≥22-µF X7R/X5R MLCCs; tantalum or electrolytic capacitors are unnecessary and discouraged. Ceramic use minimizes ESR-related ripple, improves high-frequency noise bypassing, and avoids aging or temperature drift issues associated with other dielectrics - all confirmed in Typical Characteristics (Figures 1–3, 11–13).
LMR10515XSD/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)
LMR10515XSD/NOPB FAQ
1.How can I place an order for LMR10515XSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515XSD/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 LMR10515XSD/NOPB reliable?
The price and inventory of LMR10515XSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515XSD/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515XSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515XSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515XSD/NOPB?
LMR10515XSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515XSD/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 LMR10515XSD/NOPB?
For technical support, including LMR10515XSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515XSD/NOPB requirements.
6.How does Aetrix verify that LMR10515XSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515XSD/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 LMR10515XSD/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515XSD/NOPB?
All LMR10515XSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515XSD/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 LMR10515XSD/NOPB part is unused and in its original packaging.
Return procedure for LMR10515XSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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