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Texas Instruments LMR10515YMFE/NOPB
- Part No.:
- LMR10515YMFE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMR10515YMFE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,358
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Product details
Overview
LMR10515YMFE/NOPB from Texas Instruments is a monolithic 3–5.5-V input, 1.5-A synchronous step-down DC/DC regulator in a 6-pin WSON package (3 × 3 × 0.8 mm), featuring 3-MHz fixed switching frequency, 0.6-V feedback reference, and internal PMOS switch with 150-mΩ on-resistance. It delivers high power density for point-of-load conversion in space-constrained battery-powered instruments and industrial distributed power systems.
For engineers reviewing the LMR10515YMFE/NOPB datasheet, LMR10515YMFE/NOPB pinout, LMR10515YMFE/NOPB application, or LMR10515YMFE/NOPB equivalent, key selection considerations include its 3-MHz operation enabling ultra-small external magnetics, 30-nA shutdown current for battery longevity, internal compensation reducing BOM count, and thermal shutdown + overvoltage protection for robust system-level reliability.
Technical Context
The LMR10515YMFE/NOPB implements current-mode PWM control with an internally generated 3-MHz oscillator, supporting minimum on-times down to 30 ns for stable regulation at low output voltages (0.6 V) across the full 3–5.5-V input range. Its internal 150-mΩ PMOS switch and integrated soft-start (600 µs ramp) enable fast transient response without external loop compensation.
It features undervoltage lockout (UVLO) with 2.73-V turn-on threshold and 430-mV hysteresis, cycle-by-cycle current limiting (2.5-A typical), and thermal shutdown at 165°C. The FB pin senses output voltage via resistor divider, referenced to a precision 0.600-V internal bandgap (±2% over temperature).
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 Current | Up to 1.5 A - sufficient for powering microcontrollers, sensors, and RF modules in portable equipment. |
| Switching Frequency | 3 MHz - enables use of sub-1-µH inductors and 10–22-µF ceramic capacitors, minimizing solution footprint. |
| Feedback Reference | 0.600 V ±2% - sets output voltage via external resistor divider; enables 0.6–4.5-V adjustable outputs with high accuracy. |
| Quiescent Current (Shutdown) | 30 nA typical - extends battery life in always-on or sleep-mode applications such as smart meters and handheld test gear. |
| Internal Switch RDS(ON) | 150 mΩ (WSON) - reduces conduction loss at 1.5-A load; contributes to >90% efficiency at mid-load with 3.3-VOUT. |
| Thermal Shutdown Threshold | 165°C - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C. |
Pinout & Package
LMR10515YMFE/NOPB uses the NGG (WSON-6) package: 3.00 mm × 3.00 mm × 0.80 mm body with exposed thermal pad (DAP). The DAP must be soldered to PCB ground plane for optimal thermal performance (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback input | Connects to resistor divider midpoint; regulates output by comparing divided VOUT to 0.6-V internal reference. |
| GND | Signal and power ground | Primary return path for feedback network and internal circuitry; place bottom feedback resistor adjacent to this pin. |
| SW | Switch node | Drives external inductor and catch diode; swings from ~0 V to VIN during operation; requires tight layout to minimize EMI. |
| VIND | Power input supply | Supplies internal PMOS switch; connect directly to input capacitor with low-impedance trace. |
| VINA | Control circuitry supply | Provides bias for internal logic and error amplifier; must be tied to VIND on PCB - not left floating. |
| EN | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 30-nA shutdown current; do not float. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components - reduces design time and BOM cost while ensuring stability across operating conditions. |
| 3-MHz fixed-frequency operation | Enables <1-µH inductors and compact 0805/1206 ceramic capacitors - ideal for ultra-thin portable devices and dense industrial PCBs. |
| Internal soft-start (600 µs) | Controls output voltage ramp rate to limit inrush current into bulk capacitance - prevents input rail droop and system reset during power-up. |
| Output overvoltage protection (OVP) | Disables switch if FB exceeds 15% above 0.6 V - safeguards downstream ICs from catastrophic overvoltage events due to feedback resistor failure. |
| Pulse-by-pulse current limit | Clamps peak switch current at 2.5 A (typical) each cycle - prevents thermal runaway during short-circuit or heavy transient loads. |
Applications
| Point-of-Load Power for Microcontrollers | Battery-Powered Handheld Instruments |
|---|---|
Use Scenario: Regulating 3.3-V rail down to 1.8 V for ARM Cortex-M4 MCU core and peripherals in a portable oscilloscope. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.5-A peak current with fast load transient response to handle CPU burst modes. Use Value: 3-MHz switching minimizes inductor size (1.0 µH) and avoids audible noise; 30-nA shutdown extends 2000-mAh Li-ion battery life to >12 months in standby. | Use Scenario: Powering a multi-sensor data logger (temperature, humidity, accelerometer) operating from two AA alkaline cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Efficient buck converter generating stable 3.0-V supply across wide input range and varying load (10 µA–1.2 A). Use Value: UVLO hysteresis prevents oscillation near battery end-of-life; internal compensation ensures stable regulation without tuning across temperature (-40°C to +85°C). |
| Industrial Power Meters | Space-Constrained IoT Edge Nodes |
Use Scenario: Providing isolated 5-V and 3.3-V supplies in a DIN-rail mounted electricity meter with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Secondary-side non-isolated buck regulator converting 12-V intermediate rail to 3.3-V logic supply for metrology SoC and communication interface. Use Value: WSON-6 package with thermal pad achieves <40°C rise at 1.2-A load on 2-layer board; OVP protects metering ASIC from feedback fault-induced overvoltage. | Use Scenario: Power management in a coin-cell–powered BLE sensor node where PCB area is limited to 12 × 12 mm. IC Role / Device Role / Timing Role: Single-chip buck solution replacing discrete controller + MOSFET + driver, delivering 1.5-A peak for radio transmission bursts. Use Value: Tiny 3 × 3 mm footprint and 22-µF total capacitance (input + output) meet size target; 150-mΩ RDS(ON) sustains >92% efficiency at 1-A load, maximizing RF range. |
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 | 2.2–5.5-V input, 3-MHz, 0.6-V reference, but uses external compensation and requires separate enable logic. | Lacks internal soft-start and OVP; requires additional components for robustness in safety-critical sensing nodes. | Choose when design flexibility (e.g., custom compensation) outweighs BOM simplicity and protection features. |
| MP2155GQZ-P | 3–17-V input, 2-MHz, 0.8-V reference, 1.5-A rating, but 220-mΩ RDS(ON) and no UVLO hysteresis. | Higher dropout at low input (e.g., 2.4-V alkaline); less suitable for battery end-of-life operation. | Prefer for wider input ranges where 3.3-V rail stability is secondary to input voltage coverage. |
Compared with TPS62172DRVR and MP2155GQZ-P, the LMR10515YMFE/NOPB offers superior integration (no external compensation, built-in soft-start/OVP/UVLO hysteresis) and lower RDS(ON), making it optimal for compact, battery-sensitive, and reliability-critical applications where minimal external parts and guaranteed protection are mandatory.
Availability
LMR10515YMFE/NOPB is available at Aetrix Electronics and suitable for point-of-load conversions from 3.3-V and 5-V rails, battery-powered handheld instruments, and industrial distributed power applications requiring stable component supply and long-term manufacturability.
Supply support for LMR10515YMFE/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 and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.
The LMR10515 belongs to TI's high-frequency monolithic buck regulator product line, designed specifically for space-constrained, efficiency-critical applications where small solution size, fast transient response, and robust protection features are essential.
FAQ
What is the recommended input capacitor for LMR10515YMFE/NOPB?
The LMR10515YMFE/NOPB requires a minimum 22-µF ceramic input capacitor (X7R/X5R dielectric) placed close to the VIND and GND pins. This value ensures stable operation under 1.5-A load transients and suppresses high-frequency switching noise. Use low-ESL 0805 or 1206 case sizes; avoid leaded or high-ESL tantalum types due to impedance rise at 3 MHz.
Does LMR10515YMFE/NOPB require external compensation components?
No, the LMR10515YMFE/NOPB is internally compensated. Its control loop is factory-tuned for stability with standard external components (inductor, output capacitor, feedback resistors). No external compensation network (e.g., RC zero/pole) is needed - simplifying layout and reducing BOM count versus controllers requiring external compensation.
What is the maximum achievable output voltage using LMR10515YMFE/NOPB?
The LMR10515YMFE/NOPB supports output voltages up to 4.5 V, set by the resistor divider on the FB pin. With VFB = 0.600 V, the maximum output is achieved when R1 ≫ R2 - for example, R1 = 65 kΩ and R2 = 10 kΩ yields VOUT = 4.5 V. Ensure the selected resistors maintain ≤1% tolerance and ≤100-ppm/°C TCR for precision regulation.
How does the EN pin function on LMR10515YMFE/NOPB?
The EN pin on LMR10515YMFE/NOPB is an active-high enable input. A voltage ≥1.8 V enables regulation; ≤0.4 V disables the device, reducing quiescent current to 30 nA typical. The pin must never be left floating - tie to GND via 100-kΩ resistor if unused. Do not exceed VINA + 0.3 V to prevent damage.
Can LMR10515YMFE/NOPB operate with a 2.4-V input supply?
No, LMR10515YMFE/NOPB cannot reliably operate below 3 V input. Its undervoltage lockout (UVLO) turns off the regulator when VIN drops below 2.73 V (typical), and the minimum recommended operating voltage is 3 V. For 2.4–3.2-V battery inputs, consider a regulator with lower UVLO threshold such as TPS62740 or MAX17222.
LMR10515YMFE/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
LMR10515YMFE/NOPB FAQ
1.How can I place an order for LMR10515YMFE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515YMFE/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 LMR10515YMFE/NOPB reliable?
The price and inventory of LMR10515YMFE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515YMFE/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515YMFE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515YMFE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515YMFE/NOPB?
LMR10515YMFE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515YMFE/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 LMR10515YMFE/NOPB?
For technical support, including LMR10515YMFE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515YMFE/NOPB requirements.
6.How does Aetrix verify that LMR10515YMFE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515YMFE/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 LMR10515YMFE/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515YMFE/NOPB?
All LMR10515YMFE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515YMFE/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 LMR10515YMFE/NOPB part is unused and in its original packaging.
Return procedure for LMR10515YMFE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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