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Texas Instruments LMR10515YSDX/NOPB
- Part No.:
- LMR10515YSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR10515YSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,230
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Product details
Overview
LMR10515YSDX/NOPB from Texas Instruments is a monolithic 3-MHz, current-mode PWM step-down DC/DC regulator in a 6-pin WSON (3 × 3 × 0.8 mm) package, delivering up to 1.5 A output current with 0.6 V feedback reference and internal compensation. It operates from 3 V to 5.5 V input, supports 0.6 V–4.5 V adjustable output, and targets space-constrained point-of-load conversion in battery-powered instrumentation and industrial power meters.
For engineers reviewing the LMR10515YSDX/NOPB datasheet, LMR10515YSDX/NOPB pinout, LMR10515YSDX/NOPB application, or LMR10515YSDX/NOPB equivalent, key selection considerations include its fixed 3-MHz switching frequency, 30 nA shutdown IQ, thermal shutdown at 165°C, 150 mΩ WSON-package RDS(ON), and output overvoltage protection triggered at +15% above VFB.
Technical Context
The LMR10515YSDX/NOPB implements current-mode PWM control with an internally generated artificial ramp, enabling fast transient response and stable regulation across wide load and line variations. Its 3-MHz oscillator allows use of sub-1-µH inductors and ceramic capacitors while maintaining >93% peak efficiency at 1.5-A load.
It integrates a 150-mΩ PMOS switch, internal soft-start (600 µs ramp), undervoltage lockout (2.73 V rising threshold, 430 mV hysteresis), pulse-by-pulse current limit (1.8 A min, 2.5 A typ), and output overvoltage protection via FB-pin comparator referenced to 1.15×VREF. The WSON package features separate VINA (control supply) and VIND (power input) pins for improved noise immunity.
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 transceivers in portable instruments. |
| Switching Frequency | 3 MHz (fixed) - enables ultra-compact designs using ≤1 µH inductors and low-ESR ceramic capacitors. |
| Feedback Reference | 0.600 V ±12 mV - sets output voltage via external resistor divider; enables 0.6 V minimum output with high accuracy. |
| RDS(ON) | 150 mΩ (WSON package) - limits conduction loss at full load; contributes to ≥93% peak efficiency at 1.5 A. |
| Shutdown Quiescent Current | 30 nA typical - preserves battery life in always-on or sleep-mode applications such as smart meters. |
| Thermal Shutdown | 165°C junction temperature - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LMR10515YSDX/NOPB uses a 6-pin WSON package (3.00 mm × 3.00 mm × 0.8 mm) with exposed die attach pad (DAP) for thermal dissipation. DAP must be connected to system ground but cannot serve as primary GND return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback input | Connects to bottom resistor of external voltage divider; regulates output by comparing divided VOUT to 0.6-V internal reference. |
| GND | Signal and power ground | Reference node for FB, EN, and internal circuitry; requires low-impedance connection near FB resistor. |
| SW | Switch node | Drives external inductor and catch diode; swings from ~VIN (on) to ~−0.3 V (off); high dv/dt node requiring tight layout. |
| VIND | Power input supply | Primary power rail for internal PMOS switch; decoupled with 22-µF ceramic capacitor close to pin. |
| VINA | Control circuitry supply | Bias supply for internal logic, error amplifier, and oscillator; must be tied to VIND on PCB for proper operation. |
| EN | Enable control | Logic-high active enable; threshold 1.8 V; must not float or exceed VINA + 0.3 V to avoid damage. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network; reduces BOM count and layout sensitivity. |
| Internal soft-start | 600-µs VREF ramp prevents inrush current and output overshoot during startup. |
| Output overvoltage protection | Shuts down SW when FB exceeds 1.15×VREF (≈0.69 V), protecting downstream loads from fault conditions. |
| Pulse-by-pulse current limit | Monitors switch current each cycle; limits peak inductor current to ≥1.8 A, preventing MOSFET failure under short-circuit. |
| Separate VINA/VIND pins | Isolates noise-sensitive control circuitry from high-current power path, improving stability in noisy environments. |
Applications
| Portable Hand-Held Instruments | Power Meters |
|---|---|
Use Scenario: Battery-powered multimeters and handheld oscilloscopes requiring regulated 1.8-V or 3.3-V rails from single-cell Li-ion or dual-cell alkaline sources. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, efficient local power with minimal board area. Use Value: 3-MHz operation enables <1-mm² total solution size; 30-nA shutdown IQ extends battery runtime between measurements. | Use Scenario: Smart electricity meters needing isolated, reliable 3.3-V supply for metrology ICs and communication modules in harsh industrial environments. IC Role / Device Role / Timing Role: Point-of-load converter handling transient surges during PLC or RF transmission bursts. Use Value: Thermal shutdown (165°C) and UVLO hysteresis (430 mV) ensure robust operation despite ambient temperature swings and input rail droop. |
| Industrial Distributed Power | Space-Constrained Embedded Systems |
Use Scenario: DIN-rail mounted controllers with limited PCB real estate, powering FPGA I/O banks or analog front-ends from 5-V backplane. IC Role / Device Role / Timing Role: Compact, high-frequency buck regulator replacing larger discrete solutions. Use Value: WSON package (3 × 3 mm) and internal compensation reduce component count to just inductor, diode, and two capacitors. | Use Scenario: Wearable health monitors where thickness and weight are critical, requiring sub-2-mm profile power conversion. IC Role / Device Role / Timing Role: Main DC/DC converter supplying MCU core and sensor interface rails. Use Value: 0.8-mm package height and 93% peak efficiency minimize heat generation and extend wearable battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62172DSGR | 2.25–5.5-V input, 3-MHz fixed frequency, 0.6-V reference, but uses SOT-563 (1.6 × 1.6 mm) and lacks separate VINA/VIND pins. | Lower quiescent current (15 µA vs 30 nA shutdown), no OVP, smaller footprint but higher thermal resistance (θJA = 194°C/W). | Preferred for ultra-low-IQ sleep modes where OVP is handled externally; less suitable for noisy industrial inputs due to shared VIN pin. |
| LMR10515XSDX/NOPB | Same package and pinout, but 1.6-MHz switching frequency, 130-mΩ RDS(ON) (SOT-23 variant), and lower max duty cycle (86% vs 90%). | Better efficiency at medium loads (1–1.2 A); higher inductor size required; same thermal shutdown and OVP functionality. | Select when board space allows larger inductors and priority is peak efficiency over minimum footprint. |
Compared with TPS62172DSGR and LMR10515XSDX/NOPB, the LMR10515YSDX/NOPB offers superior noise immunity via split VIN pins, tighter output voltage accuracy (±2%), and integrated OVP-making it optimal for safety-critical metering and instrumentation where reliability outweighs marginal IQ savings.
Availability
LMR10515YSDX/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 LMR10515YSDX/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, battery-efficient applications demanding fast transient response and minimal external components.
FAQ
What is the switching frequency of the LMR10515YSDX/NOPB?
The LMR10515YSDX/NOPB has a fixed internal switching frequency of 3 MHz. This value is factory-trimmed and not user-adjustable. It enables use of very small inductors (typically ≤1 µH) and ceramic output capacitors, reducing overall solution size while maintaining high efficiency-up to 93% at 1.5-A load with 5-V input and 3.3-V output. The 3-MHz frequency is confirmed in the Electrical Characteristics table (FSW = 2.25–3.75 MHz, typical 3.0 MHz) and applies specifically to the "Y" variant denoted in the part number LMR10515YSDX/NOPB.
Does the LMR10515YSDX/NOPB require external compensation components?
No, the LMR10515YSDX/NOPB is internally compensated. Its control loop is optimized for stability with minimal external components-only an inductor, catch diode, input capacitor, output capacitor, and feedback resistors are required. This eliminates the need for external compensation networks (e.g., type-II or type-III compensators), simplifying design, reducing BOM cost, and improving layout robustness. Internal compensation is explicitly stated in the device description, features list, and application sections of the official datasheet (SNVS728D).
What is the purpose of the separate VINA and VIND pins on the LMR10515YSDX/NOPB?
The LMR10515YSDX/NOPB uses separate VINA (control supply) and VIND (power input) pins to isolate noise-sensitive analog circuitry-including the error amplifier, oscillator, and reference-from high-current switching paths. VINA powers only the control logic and must be tied to VIND on the PCB; this architecture improves PSRR and stability in electrically noisy environments like industrial power meters or motor-driven systems. Unlike single-VIN regulators, this separation prevents switching transients on VIND from modulating the internal reference or causing false shutdowns.
What protection features does the LMR10515YSDX/NOPB include?
The LMR10515YSDX/NOPB integrates five key protection features: (1) thermal shutdown (trips at 165°C junction temperature), (2) output overvoltage protection (disables SW when FB exceeds 1.15×VREF ≈ 0.69 V), (3) undervoltage lockout (UVLO with 2.73-V turn-on and 430-mV hysteresis), (4) pulse-by-pulse current limiting (1.8-A minimum, 2.5-A typical switch current limit), and (5) internal soft-start (600-µs VREF ramp). All are implemented in silicon and require no external components-ensuring robust operation in battery-powered and industrial applications without added complexity.
Can the LMR10515YSDX/NOPB operate with a 3-V input supply?
Yes, the LMR10515YSDX/NOPB supports input voltages from 3 V to 5.5 V per the Recommended Operating Ratings. At 3-V input, it can deliver regulated outputs down to 0.6 V (e.g., powering low-voltage MCUs or sensors), though maximum duty cycle is limited to 90%, constraining the lowest achievable output (e.g., VOUT ≥ 0.3 V at D = 90%). Efficiency remains high (>85%) across the range, and UVLO ensures reliable startup only after VIN exceeds 2.73 V. This makes the LMR10515YSDX/NOPB suitable for single-cell Li-ion (2.7–4.2 V) and dual-cell alkaline (2.4–3.2 V) battery systems with appropriate headroom.
LMR10515YSDX/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)
LMR10515YSDX/NOPB FAQ
1.How can I place an order for LMR10515YSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515YSDX/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 LMR10515YSDX/NOPB reliable?
The price and inventory of LMR10515YSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515YSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515YSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515YSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515YSDX/NOPB?
LMR10515YSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515YSDX/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 LMR10515YSDX/NOPB?
For technical support, including LMR10515YSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515YSDX/NOPB requirements.
6.How does Aetrix verify that LMR10515YSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515YSDX/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 LMR10515YSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515YSDX/NOPB?
All LMR10515YSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515YSDX/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 LMR10515YSDX/NOPB part is unused and in its original packaging.
Return procedure for LMR10515YSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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