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Texas Instruments LMR10515XMFX/NOPB
- Part No.:
- LMR10515XMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMR10515XMFX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,074
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Product details
Overview
LMR10515XMFX/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. It operates from 3 V to 5.5 V input, delivers 0.6 V to 4.5 V output, features internal PMOS switch (130 mΩ), current-mode PWM control, and achieves up to 93% efficiency in space-constrained point-of-load applications such as portable instrumentation and power meters.
For engineers reviewing the LMR10515XMFX/NOPB datasheet, LMR10515XMFX/NOPB pinout, LMR10515XMFX/NOPB application, or LMR10515XMFX/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world application constraints, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The LMR10515XMFX/NOPB implements fixed-frequency current-mode PWM control with an internally set 1.6-MHz switching frequency and internal compensation-eliminating external loop components. Its 130-mΩ PMOS switch enables 1.5-A continuous output with pulse-by-pulse current limiting (typ. 2.5 A) and thermal shutdown at 165°C.
It uses a precision 0.600-V feedback reference (±2% over −40°C to +125°C), supports ultra-low shutdown IQ (30 nA), and integrates soft-start (600 µs ramp), undervoltage lockout (2.73 V rising, 430 mV hysteresis), and output overvoltage protection (15% above VREF).
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 - programmable via external resistor divider; 0.600-V ±2% reference enables tight tolerance at low voltages. |
| Max Output Current | 1.5 A - sustained delivery enabled by 130-mΩ internal PMOS switch in SOT-23 package. |
| Switching Frequency | 1.6 MHz (fixed) - allows use of sub-2.2-µH inductors and small ceramic capacitors for minimal PCB footprint. |
| Feedback Reference Voltage | 0.600 V ±12 mV - ensures accurate output regulation across full temperature range (−40°C to +125°C). |
| Shutdown Quiescent Current | 30 nA typical - preserves battery life in always-on or sleep-mode systems. |
| Thermal Shutdown Threshold | 165°C - protects device during overload or poor thermal layout; auto-recovery at ~150°C. |
Pinout & Package
LMR10515XMFX/NOPB is housed in a 5-pin SOT-23 package (2.92 mm × 2.84 mm × 1.0 mm), optimized for high power density and thermal performance on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Connects to inductor and catch diode; carries high dv/dt and pulsed current - 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; bias current <100 nA minimizes divider error and power loss. |
| 4 - EN | Enable control | Logic-high active enable; threshold 1.8 V; must not float or exceed VIN + 0.3 V - requires pull-down if unused. |
| 5 - VIN | Input supply | Power input for both control circuitry and internal PMOS switch; accepts 3–5.5 V with UVLO hysteresis (2.73 V / 2.3 V). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity. |
| 130-mΩ internal PMOS switch (SOT-23) | Enables 1.5-A output in smallest available package without external MOSFET or driver complexity. |
| 1.6-MHz fixed switching frequency | Supports use of ≤2.2-µH shielded inductors and 22-µF X7R/X5R MLCCs - cuts solution size by >40% vs lower-frequency regulators. |
| Internal soft-start (600 µs) | Controls output ramp rate to limit inrush current into downstream capacitance - prevents input rail droop and system reset. |
| Pulse-by-pulse current limit | Protects against short-circuit and overload with 2.5-A typical limit - maintains stability without external sensing. |
Applications
| Portable Hand-Held Instruments | Power Meters |
|---|---|
Use Scenario: Battery-powered multimeters and handheld oscilloscopes requiring stable 1.8-V or 3.3-V rails from single-cell Li-ion or dual-cell alkaline inputs. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering regulated voltage to microcontroller, ADC, and display drivers. Use Value: 93% peak efficiency at 1-A load extends battery runtime; 30-nA shutdown IQ preserves charge during standby. |
Use Scenario: Smart electricity meters with isolated MCU, metrology ASIC, and RF communication modules operating from 3.3-V or 5-V backplane rails. IC Role / Device Role / Timing Role: Local DC/DC converter supplying clean, low-noise 1.2-V core voltage to metrology ICs. Use Value: 0.600-V ±12 mV reference ensures <±1% output accuracy over temperature - critical for measurement integrity. |
| Industrial Distributed Power | Space-Constrained Embedded Systems |
Use Scenario: DIN-rail mounted PLC I/O modules where board area is limited and thermal dissipation is constrained by enclosure design. IC Role / Device Role / Timing Role: Compact step-down regulator powering FPGA configuration logic and interface transceivers. Use Value: SOT-23 footprint (2.92 × 2.84 mm) and 1.6-MHz operation reduce total solution size to <25 mm² - fits within tight module spacing. |
Use Scenario: Wearable health monitors and sensor nodes needing ultra-small power conversion without compromising transient response. IC Role / Device Role / Timing Role: High-frequency buck regulator driving low-voltage sensors and BLE SoCs from coin-cell or thin-film batteries. Use Value: 1.6-MHz switching enables fast load-transient recovery (<10 µs) and eliminates audible noise - essential for user-facing devices. |
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, 3-A output, 17-µV RMS noise, WQFN-16 package (3 × 3 mm); requires external compensation. | Better suited for higher-current, low-noise applications where PCB area permits larger package and added components. | Select when >1.5-A output or tighter ripple specs are required; not drop-in due to different pinout and compensation needs. |
| LMR10515YMF/NOPB | Same SOT-23 package but 3-MHz switching frequency; identical pinout and FB reference; higher quiescent current (4.3–6.5 mA vs 3.3–5 mA). | Preferred for designs needing smaller inductors/caps where higher switching loss is acceptable for reduced component size. | Direct functional alternative with same footprint - swap only if 3-MHz operation better matches system EMI or layout constraints. |
Compared with LMR10515XMFX/NOPB, TPS62130ARGTR offers higher current and lower noise but demands more board space and design effort, while LMR10515YMF/NOPB provides identical integration and pin compatibility at the cost of increased light-load quiescent consumption.
Availability
LMR10515XMFX/NOPB is available at Aetrix Electronics and suitable for portable hand-held instruments, power meters, and industrial distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMR10515XMFX/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 technologies, with leadership in high-efficiency DC/DC conversion and industrial-grade reliability.
The LMR10515XMFX/NOPB belongs to TI's LMR series of monolithic step-down regulators, designed specifically for space-constrained, high-density point-of-load applications demanding low quiescent current, fast transient response, and minimal external components.
FAQ
What is the maximum output current capability of the LMR10515XMFX/NOPB?
The LMR10515XMFX/NOPB delivers up to 1.5 A continuous output current under recommended operating conditions (VIN = 3–5.5 V, TJ ≤ 125°C). This is enabled by its integrated 130-mΩ PMOS switch in the SOT-23 package. Peak current limit is typically 2.5 A with pulse-by-pulse protection, but sustained operation above 1.5 A risks thermal shutdown unless board-level thermal management is enhanced.
Does the LMR10515XMFX/NOPB require external compensation components?
No, the LMR10515XMFX/NOPB features an internally compensated current-mode control loop. This eliminates the need for external compensation networks (e.g., Type II/III compensators), simplifying design, reducing BOM count, and improving layout robustness - especially critical in high-density layouts where parasitic effects impact stability.
What is the switching frequency of the LMR10515XMFX/NOPB and how does it affect component selection?
The LMR10515XMFX/NOPB operates at a fixed 1.6-MHz switching frequency. This high frequency enables use of small surface-mount inductors (e.g., 1.0–2.2 µH) and compact ceramic output capacitors (≥22 µF X7R/X5R), significantly reducing total solution size. It also improves transient response and avoids audible noise, but increases switching losses slightly compared to lower-frequency alternatives.
How is the output voltage set on the LMR10515XMFX/NOPB?
The output voltage of the LMR10515XMFX/NOPB is set using a resistor divider between VOUT and GND, connected to the FB pin. With a precise 0.600-V internal reference, VOUT = 0.6 × (1 + R1/R2). For example, R2 = 10 kΩ and R1 = 10 kΩ yields 1.2 V. The FB pin draws <100 nA, minimizing divider error and enabling high-resistor values to reduce quiescent current.
What thermal protection features does the LMR10515XMFX/NOPB include?
The LMR10515XMFX/NOPB includes thermal shutdown that activates at 165°C junction temperature, turning off the internal PMOS switch until the die cools to approximately 150°C. It also features thermal derating via its θJA of 118°C/W (SOT-23), meaning ambient temperature rise must be managed through copper area, airflow, or thermal vias - especially critical at full 1.5-A load in enclosed environments.
LMR10515XMFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
LMR10515XMFX/NOPB FAQ
1.How can I place an order for LMR10515XMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515XMFX/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 LMR10515XMFX/NOPB reliable?
The price and inventory of LMR10515XMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515XMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515XMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515XMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515XMFX/NOPB?
LMR10515XMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515XMFX/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 LMR10515XMFX/NOPB?
For technical support, including LMR10515XMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515XMFX/NOPB requirements.
6.How does Aetrix verify that LMR10515XMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515XMFX/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 LMR10515XMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515XMFX/NOPB?
All LMR10515XMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515XMFX/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 LMR10515XMFX/NOPB part is unused and in its original packaging.
Return procedure for LMR10515XMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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