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Texas Instruments LMR10515YMFX/NOPB
- Part No.:
- LMR10515YMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMR10515YMFX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR10515YMFX/NOPB from Texas Instruments is a monolithic, high-frequency PWM step-down DC/DC converter in a 6-pin WSON package (3.0 mm × 3.0 mm × 0.8 mm), delivering up to 1.5 A output current with 0.6 V to 4.5 V adjustable output voltage, 3 MHz fixed switching frequency, and 30 nA shutdown quiescent current. It serves as a compact point-of-load regulator for space-constrained battery-powered instruments and industrial distributed power rails.
For engineers reviewing the LMR10515YMFX/NOPB datasheet, LMR10515YMFX/NOPB pinout, LMR10515YMFX/NOPB application, or LMR10515YMFX/NOPB equivalent, key selection criteria include its 3 MHz switching frequency enabling ultra-small passive components, internal compensation eliminating loop compensation design effort, 0.6 V feedback reference for precise low-VOUT regulation, and thermal shutdown + overvoltage protection for robust operation in embedded systems.
Technical Context
The LMR10515YMFX/NOPB implements current-mode PWM control with an internally compensated error amplifier and a 3 MHz oscillator, supporting minimum on-times down to 30 ns for stable regulation at low duty cycles (e.g., 1.8 V out from 5 V in). Its integrated 130 mΩ PMOS switch and pulse-by-pulse current limiting enable fast transient response and reliable 1.5 A load handling without external sense resistors.
It features dedicated VINA (control supply) and VIND (power input) pins in the WSON package, allowing independent routing of analog and power grounds to minimize noise coupling. The FB pin senses output voltage via a resistor divider referenced to a 0.600 V ±12 mV internal bandgap, with line regulation of 0.02 %/V and bias current under 100 nA - critical for high-accuracy, low-power feedback networks.
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 externally via resistor divider; 0.600 V ±12 mV feedback reference enables accurate low-VOUT designs (e.g., 1.2 V core supplies). |
| Max Output Current | 1.5 A - delivered continuously with thermal shutdown activation at 165°C junction temperature. |
| Switching Frequency | 3 MHz - allows use of sub-2.2 µH inductors and 10–22 µF ceramic capacitors, minimizing solution footprint. |
| Quiescent Current (Shutdown) | 30 nA typical - enables ultra-low power retention in battery-backed or always-on subsystems. |
| Feedback Voltage Accuracy | 0.588 V to 0.612 V at 25°C - ensures ≤±2% output voltage tolerance across production units without trimming. |
| Internal Switch RDS(ON) | 130 mΩ (SOT-23), 150 mΩ (WSON) - determines conduction loss; WSON variant offers lower thermal resistance (θJA = 80°C/W). |
Pinout & Package
LMR10515YMFX/NOPB uses the NGG (6-pin WSON) package: 3.00 mm × 3.00 mm body, 0.8 mm height, exposed die attach pad (DAP) for thermal enhancement. DAP must be soldered to PCB ground plane but is not a functional signal pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback input | Connects to bottom resistor of output voltage divider; high-impedance node (≤100 nA bias) requiring short, noise-shielded trace routing. |
| 2 - GND | Signal and power ground | Primary return path for feedback network and internal circuitry; place bottom feedback resistor adjacent to this pin. |
| 3 - SW | Switch node | Drives external inductor and catch diode; high dv/dt node requiring minimized trace area and separation from sensitive signals. |
| 4 - VIND | Power input supply | Connects to main input capacitor; carries high pulsed current - route with low-inductance, wide copper pour. |
| 5 - VINA | Control circuitry supply | Must be tied to VIND on PCB; powers internal logic and reference - decoupling capacitor required near pin. |
| 6 - EN | Enable control input | Logic-high active; threshold 1.8 V min, 0.4 V max for shutdown; must not float or exceed VINA + 0.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity while maintaining stability across 0.6–4.5 V VOUT range. |
| 3 MHz fixed-frequency operation | Enables use of 1.0–2.2 µH shielded inductors and 10–22 µF X7R/X5R MLCCs - cuts total solution area by >40% vs. 1.6 MHz variants. |
| Internal soft-start (600 µs ramp) | Prevents inrush current during power-up - avoids input rail droop and eliminates need for external soft-start timing components. |
| Output overvoltage protection (OVP) | Shuts off internal switch if FB exceeds 15% above 0.6 V - protects downstream loads from catastrophic failure due to feedback divider fault. |
| Pulse-by-pulse current limit | Triggers at 1.8 A min (2.5 A typ) per cycle - provides immediate overcurrent protection without latch-up, supporting hiccup or foldback recovery. |
Applications
| Industrial Power Meters | Portable Hand-Held Instruments |
|---|---|
Use Scenario: Compact, battery-operated electricity meters requiring isolated 3.3 V and 1.8 V rails for MCU, ADC, and RF transceiver. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.3 V battery or supercapacitor source to 1.8 V core supply with <100 µV ripple. Use Value: 3 MHz switching minimizes inductor size (<1.5 mm height), enabling conformal coating over full PCB - critical for IP67-rated meter enclosures. | Use Scenario: Handheld multimeter with LCD, precision analog front-end, and Bluetooth LE radio operating from two AA cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Efficient buck converter generating stable 3.0 V rail for display and sensors, with ultra-low 30 nA shutdown current extending battery life. Use Value: Internal 0.6 V reference and ±2% FB accuracy ensure consistent 3.0 V output across battery discharge curve - eliminating calibration drift in field use. |
| Point-of-Load Conversion (3.3 V Rail) | Space-Constrained Industrial Controllers |
Use Scenario: FPGA I/O bank supply in programmable logic controller where board real estate is limited to <50 mm² per rail. IC Role / Device Role / Timing Role: Local DC/DC regulator placed directly adjacent to FPGA ball grid, minimizing trace inductance and improving transient response. Use Value: WSON package with DAP thermal pad achieves 80°C/W θJA, allowing 1.5 A continuous output at 65°C ambient without heatsink - reducing system cooling requirements. | Use Scenario: DIN-rail mounted PLC module with stacked PCB architecture and strict 8 mm maximum profile height. IC Role / Device Role / Timing Role: High-density power stage delivering 1.2 V @ 1.2 A to ARM Cortex-M7 microcontroller core. Use Value: 30 ns minimum on-time supports 1.2 V output from 3.3 V input at 3 MHz - enabling single-stage conversion without intermediate 1.8 V rail, saving layer count and component cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62172DRVR | 2.25–5.5 V input, 3 MHz, 0.6 V ref, but uses synchronous rectification (no external diode) and has higher 10 µA shutdown IQ. | Requires no external Schottky diode; better efficiency at light loads but larger solution size due to dual MOSFET layout. | Select when diode elimination and >90% light-load efficiency outweigh footprint constraints. |
| LMR10515XMF/NOPB | Same package and pinout, but 1.6 MHz switching frequency and 130 mΩ RDS(ON) (SOT-23 only); LMR10515YMFX/NOPB is WSON-only 3 MHz variant. | Lower frequency allows larger, cheaper inductors but increases solution size; not pin-compatible due to different package (SOT-23 vs WSON). | Select only if 3 MHz is unnecessary and SOT-23 mechanical fit is required - not a drop-in replacement. |
Compared with TPS62172DRVR, LMR10515YMFX/NOPB offers smaller total footprint and lower shutdown IQ but requires an external Schottky diode; compared with LMR10515XMF/NOPB, it delivers higher frequency operation in a thermally superior WSON package but is not mechanically interchangeable.
Availability
LMR10515YMFX/NOPB is available at Aetrix Electronics and suitable for industrial power meters, portable hand-held instruments, point-of-load conversions from 3.3-V rails, space-constrained controllers, and battery-powered equipment requiring stable component supply across multi-year production cycles.
Supply support for LMR10515YMFX/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 LMR10515YMFX/NOPB belongs to TI's LMR series of high-frequency monolithic buck regulators, engineered specifically for space- and power-constrained embedded systems where minimal external components and fast transient response are essential.
FAQ
What is the recommended input capacitor for LMR10515YMFX/NOPB?
The recommended input capacitor for LMR10515YMFX/NOPB is a 22 µF X7R or X5R multilayer ceramic capacitor (MLCC) rated for ≥6.3 V, placed as close as possible to the VIND and GND pins. This value ensures adequate charge reservoir during high-frequency switching transients while maintaining low ESL - critical for stability at 3 MHz. Avoid leaded or high-ESL tantalum capacitors, as their impedance may compromise regulation.
Does LMR10515YMFX/NOPB require external compensation components?
No, LMR10515YMFX/NOPB does not require external compensation components. It features an internally compensated current-mode control loop optimized for stability across its full 0.6 V to 4.5 V output voltage range and 3 MHz switching frequency. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design and reducing bill-of-materials count.
What is the function of the VINA pin on LMR10515YMFX/NOPB?
The VINA pin on LMR10515YMFX/NOPB supplies power to the internal control circuitry, including the error amplifier, oscillator, and logic blocks. It must be connected directly to VIND on the PCB using a low-inductance trace and decoupled with a 0.1 µF ceramic capacitor placed adjacent to the pin. Separating VINA from VIND routing prevents noise coupling into the analog reference section.
Can LMR10515YMFX/NOPB operate with a 2.8 V input voltage?
No, LMR10515YMFX/NOPB cannot reliably operate with a 2.8 V input voltage. Its undervoltage lockout (UVLO) rising threshold is 2.73 V typical, with 430 mV hysteresis - meaning it will not start until VIN exceeds ~2.73 V and will shut down if VIN falls below ~2.3 V. At 2.8 V, the device may enter unstable or undefined behavior; the guaranteed operating range starts at 3.0 V.
How is output voltage set on LMR10515YMFX/NOPB?
Output voltage on LMR10515YMFX/NOPB is set using a resistor divider between VOUT and GND, with the FB pin connected to the divider midpoint. The formula is VOUT = 0.6 V × (1 + R1/R2), where R2 is typically 10 kΩ and R1 is calculated accordingly. For example, to achieve 3.3 V output, R1 = 45 kΩ (using R2 = 10 kΩ) yields VOUT = 0.6 × (1 + 45/10) = 3.3 V.
LMR10515YMFX/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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMR10515YMFX/NOPB FAQ
1.How can I place an order for LMR10515YMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515YMFX/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 LMR10515YMFX/NOPB reliable?
The price and inventory of LMR10515YMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515YMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515YMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515YMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515YMFX/NOPB?
LMR10515YMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515YMFX/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 LMR10515YMFX/NOPB?
For technical support, including LMR10515YMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515YMFX/NOPB requirements.
6.How does Aetrix verify that LMR10515YMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515YMFX/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 LMR10515YMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515YMFX/NOPB?
All LMR10515YMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515YMFX/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 LMR10515YMFX/NOPB part is unused and in its original packaging.
Return procedure for LMR10515YMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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