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Texas Instruments LMR10515YSD/NOPB
- Part No.:
- LMR10515YSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR10515YSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR10515YSD/NOPB from Texas Instruments is a monolithic 3-MHz, current-mode PWM step-down DC/DC regulator in a 6-pin WSON package (3 × 3 × 0.8 mm), delivering up to 1.5 A output current with 0.6 V feedback reference, 30 nA shutdown IQ, and internal compensation - designed for space-constrained point-of-load conversion from 3.3-V or 5-V rails in portable instrumentation and power meters.
For engineers reviewing the LMR10515YSD/NOPB datasheet, LMR10515YSD/NOPB pinout, LMR10515YSD/NOPB application, or LMR10515YSD/NOPB equivalent, key selection considerations include its fixed 3-MHz switching frequency, WSON thermal performance (θJA = 80°C/W), 0.6 V ±2% feedback voltage tolerance, 150 mΩ PMOS RDS(ON), and integrated soft-start for controlled inrush management.
Technical Context
The LMR10515YSD/NOPB implements current-mode PWM control with an internal 3-MHz oscillator, enabling stable regulation across 3 V–5.5 V input and 0.6 V–4.5 V output ranges while supporting minimum on-times down to 30 ns. Its internal 0.6 V reference and error amplifier drive duty cycle adjustment via feedback from an external resistor divider.
It integrates pulse-by-pulse current limiting (2.5 A typical), thermal shutdown at 165°C, output overvoltage protection (15% above VREF), and undervoltage lockout with 430 mV hysteresis - all operating without external compensation components due to fully internal loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (fixed) - enables use of sub-2.2 µH inductors and 10–22 µF ceramic output capacitors, minimizing PCB footprint. |
| Feedback Voltage (VFB) | 0.600 V ±2% - sets output via external resistor divider; supports precise 1.2 V, 1.8 V, 3.3 V, or custom outputs with <±1% accuracy. |
| Output Current | 1.5 A continuous - sustained under full load with thermal derating per θJA = 80°C/W (WSON package). |
| RDS(ON) | 150 mΩ (WSON) - determines conduction loss; contributes ≤170 mW at 1.5 A, 100% duty-cycle worst-case. |
| Shutdown IQ | 30 nA typical - preserves battery life in always-on systems; allows >1-year standby in coin-cell-powered devices. |
| Input Voltage Range | 3 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), USB 5 V, and regulated 3.3 V rails. |
| Soft-Start Time | ~600 µs - ramps internal reference from 0 V to 0.6 V, limiting inrush current during power-up. |
Pinout & Package
LMR10515YSD/NOPB uses the NGG (WSON-6) package: 3.00 mm × 3.00 mm × 0.8 mm body with exposed die attach pad (DAP) for thermal enhancement. DAP must be connected to system ground for optimal thermal impedance but is not a primary current-carrying GND path.
| 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 trace to minimize noise pickup. |
| 2 GND | Signal and power ground | Primary return for feedback network and internal control circuitry; place bottom feedback resistor directly adjacent to this pin. |
| 3 SW | Switch node | Drives external inductor and catch diode; experiences fast 0 V to VIN transitions; requires low-inductance layout and minimal copper area. |
| 4 VIND | Power input supply | High-current VIN path for internal PMOS switch; decouple with ≥22 µF ceramic capacitor placed near this pin. |
| 5 VINA | Control circuitry supply | Bias rail for internal logic and error amplifier; must be tied to VIND on PCB - no separate filtering required. |
| 6 EN | Enable control | Logic-high active enable; threshold 1.8 V; must not float or exceed VINA + 0.3 V; supports sequencing and power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and layout sensitivity while ensuring stability with standard 22 µF ceramic output capacitors. |
| Current-mode PWM architecture | Provides inherent cycle-by-cycle current limiting and fast transient response (<10 µs to recover from 50% load step) without external current-sense resistors. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and re-enables at ~150°C - prevents thermal runaway during overload or poor airflow conditions. |
| Output overvoltage protection (OVP) | Disables switch when FB exceeds 0.69 V (15% above 0.6 V reference) - protects downstream loads from fault-induced overvoltage events. |
| Ultra-low shutdown quiescent current | 30 nA ensures <1 µA total system standby current when paired with low-IQ enable logic - critical for battery longevity in IoT sensors. |
Applications
| Portable Hand-Held Instruments | Power Meters |
|---|---|
Use Scenario: Battery-powered multimeters and handheld oscilloscopes requiring clean, low-noise 3.3 V or 1.8 V rails from single Li-ion cells. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 3.0–4.2 V battery voltage to stable 3.3 V for microcontroller and ADC subsystems. Use Value: 3-MHz operation minimizes EMI and enables compact 1.5 µH inductor + 22 µF ceramic capacitor solution, reducing board area by >40% vs. 500-kHz alternatives. |
Use Scenario: Smart electricity meters needing isolated, reliable 1.2 V and 3.3 V supplies for metrology ICs and RF communication modules. IC Role / Device Role / Timing Role: Secondary DC/DC stage deriving 1.2 V core voltage for precision analog front-end and 3.3 V for Zigbee/LoRa transceivers. Use Value: Internal soft-start and OVP prevent measurement corruption during cold-start or input surge events; 0.6 V reference enables accurate 1.2 V output with <±0.5% tolerance. |
| Industrial Distributed Power | Space-Constrained Applications |
Use Scenario: DIN-rail mounted PLC I/O modules where board real estate is limited and thermal dissipation must be managed without heatsinks. IC Role / Device Role / Timing Role: Local regulator powering FPGA configuration memory and interface buffers from a shared 5 V backplane rail. Use Value: WSON-6 package with DAP-to-GND connection achieves 80°C/W θJA - sustains 1.5 A output at 70°C ambient without forced air. |
Use Scenario: Wearable health monitors with rigid-flex PCBs where height and footprint are constrained to <10 mm² per power rail. IC Role / Device Role / Timing Role: Compact 1.8 V supply for BLE SoC and sensor hub, operating from coin-cell or energy-harvesting source. Use Value: 30 nA shutdown IQ extends battery life beyond 18 months; 3-MHz switching avoids audible noise and simplifies EMI filtering. |
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 fixed frequency, 0.6 V reference, but uses external compensation and requires 4.7 µH inductor. | Less compact solution due to larger inductor and added compensation components; higher design complexity. | Select TPS62172DRVR only if adjustable frequency or external loop tuning is required - not drop-in for LMR10515YSD/NOPB layouts. |
| MP2143GJ-Z | 3–17 V input, 2-MHz switching, 0.8 V reference, 2 A output, but lacks internal soft-start and has 1.5 µA shutdown IQ. | Suitable for wider input range but less optimized for low-IQ battery operation and introduces additional startup overshoot risk. | Choose MP2143GJ-Z when input exceeds 5.5 V or 2 A output is needed - otherwise LMR10515YSD/NOPB offers superior efficiency and smaller solution size at 3–5.5 V. |
Compared with TPS62172DRVR and MP2143GJ-Z, the LMR10515YSD/NOPB delivers the smallest total solution size at 3–5.5 V inputs due to internal compensation and 3-MHz operation, while offering the lowest shutdown IQ (30 nA) and integrated soft-start - making it optimal for space- and battery-limited designs where simplicity and reliability are prioritized.
Availability
LMR10515YSD/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 consistent parametric performance across production batches.
Supply support for LMR10515YSD/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 decades of leadership in high-efficiency DC/DC conversion.
The LMR10515YSD/NOPB belongs to TI's LMR family of monolithic step-down regulators, engineered specifically for ultra-compact, high-frequency point-of-load conversion in battery-powered and space-constrained industrial systems.
FAQ
What is the switching frequency of the LMR10515YSD/NOPB?
The LMR10515YSD/NOPB operates at a fixed 3-MHz switching frequency, as indicated by the "Y" suffix in its part number. This high frequency allows use of small surface-mount inductors (e.g., 1.5 µH) and ceramic capacitors (e.g., 22 µF), significantly reducing solution size. The frequency is internally set and not adjustable - confirmed in the Electrical Characteristics table (FSW = 2.25–3.75 MHz, typical 3.0 MHz) and Pin Configuration section of the datasheet.
Does the LMR10515YSD/NOPB require external compensation components?
No, the LMR10515YSD/NOPB is internally compensated, eliminating the need for external compensation networks such as RC or R-C networks typically required in voltage-mode controllers. This simplifies design, improves layout robustness, and ensures stability with standard 22 µF ceramic output capacitors - explicitly stated in the Features, Description, and Application sections of the datasheet.
What is the maximum output current capability of the LMR10515YSD/NOPB?
The LMR10515YSD/NOPB delivers up to 1.5 A of continuous output current under recommended operating conditions (VIN = 3–5.5 V, TJ ≤ 125°C). This rating assumes proper thermal management using the WSON-6 package's DAP connected to ground. Peak switch current limit is 2.5 A (typical), verified in the Electrical Characteristics table under ICL parameter.
How does the enable (EN) pin function on the LMR10515YSD/NOPB?
The EN pin on the LMR10515YSD/NOPB is a logic-high active enable input with a threshold of 1.8 V (VEN_TH). When pulled high (>1.8 V), the device starts switching; when pulled low (<0.4 V), it enters ultra-low-power shutdown mode drawing only 30 nA. The pin must never float or exceed VINA + 0.3 V - detailed in the Pin Descriptions section for the NGG (WSON-6) package.
What package type is used for the LMR10515YSD/NOPB?
The LMR10515YSD/NOPB uses the NGG package: a 6-pin WSON (Wafer-Level Small Outline No-Lead) variant measuring 3.00 mm × 3.00 mm × 0.8 mm with an exposed die attach pad (DAP). This package is distinct from the 5-pin SOT-23 option (LMR10515XSD/NOPB) and is specified in the Device Information table and Pin Configuration section of the datasheet.
LMR10515YSD/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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LMR10515YSD/NOPB FAQ
1.How can I place an order for LMR10515YSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515YSD/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 LMR10515YSD/NOPB reliable?
The price and inventory of LMR10515YSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515YSD/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515YSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515YSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515YSD/NOPB?
LMR10515YSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515YSD/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 LMR10515YSD/NOPB?
For technical support, including LMR10515YSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515YSD/NOPB requirements.
6.How does Aetrix verify that LMR10515YSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515YSD/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 LMR10515YSD/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515YSD/NOPB?
All LMR10515YSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515YSD/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 LMR10515YSD/NOPB part is unused and in its original packaging.
Return procedure for LMR10515YSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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