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Texas Instruments LMR23615QDRRTQ1
- Part No.:
- LMR23615QDRRTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23615QDRRTQ1.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:558
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Product details
Overview
LMR23615QDRRTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 1.5-A continuous output current, operating from 4-V to 36-V input, with internal compensation, PFM light-load mode, and 60-ns minimum on-time - used in automotive infotainment power rails and USB charging modules.
For engineers reviewing the LMR23615QDRRTQ1 datasheet, LMR23615QDRRTQ1 pinout, LMR23615QDRRTQ1 application, or LMR23615QDRRTQ1 equivalent, key selection considerations include VIN UVLO thresholds (3.3 V rising), 400-kHz default switching frequency, thermal shutdown at 170°C, integrated high-side/low-side MOSFETs (160 mΩ / 95 mΩ), and WSON-12 wettable flanks package for automotive-grade reflow inspection.
Technical Context
The LMR23615QDRRTQ1 employs fixed-frequency peak-current-mode control with internal loop compensation, enabling stable regulation across 1–28 V output range using only a resistor divider. Its dual-stage protection includes cycle-by-cycle current limiting (HS peak limit 3.9 A, LS valley limit 2.5 A) and hiccup-mode short-circuit response triggered after 64 cycles.
It supports frequency synchronization from 200 kHz to 2.2 MHz via EN/SYNC pin AC coupling, while maintaining PFM operation below ~100 mA load for ultra-low quiescent current (75 µA typical). The integrated 4.1-V VCC LDO powers internal circuitry and requires a 2.2-µF ceramic bypass capacitor to AGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports direct connection to automotive battery (cold-crank down to 4 V) without pre-regulation |
| Output Current | 1.5 A continuous - sufficient for powering dual-core MCU, display interface, and USB PHY simultaneously |
| Switching Frequency | Adjustable 200 kHz–2.2 MHz (default 400 kHz) - enables optimization of inductor size vs. EMI vs. light-load efficiency |
| Quiescent Current | 75 µA - extends battery runtime in always-on vehicle modules such as telematics wake-up circuits |
| Shutdown Current | 2 µA - ensures minimal drain during ignition-off states in automotive body control units |
| Feedback Reference | 1.0 V ±2% over –40°C to +125°C - enables precise output setting (e.g., 5 V ±2%) with standard 1% resistors |
| Thermal Shutdown | 170°C threshold with 15°C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed clusters |
Pinout & Package
LMR23615QDRRTQ1 uses a 12-pin WSON (DRR) package with 3.00 mm × 3.00 mm body and exposed thermal pad. Wettable flanks enable automated optical solder-joint inspection per automotive AEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Power switch node | Connects to inductor; carries full switching current and high di/dt - requires low-inductance layout and Kelvin return path |
| 3 BOOT | High-side gate driver bootstrap | Requires 100-nF ceramic capacitor to SW; critical for reliable high-side FET turn-on above 10 V |
| 4 VCC | Internal LDO output | Bypass with 2.2-µF ceramic to AGND; never load externally - supplies bias for control logic and drivers |
| 5 FB | Voltage feedback input | Connects to resistor divider midpoint; 10 nA leakage enables high-impedance dividers for low standby loss |
| 6 RT | Frequency programming | Resistor to AGND sets fSW; open = 400 kHz; 17.8 kΩ = 2.2 MHz - enables EMI tuning without changing inductors |
| 7 AGND | Analog ground reference | Separate from PGND; connects to FB, RT, EN/SYNC - must tie to system ground plane with low-noise routing |
| 8 EN/SYNC | Enable & sync input | Logic-high >1.55 V enables regulator; AC-coupled external clock synchronizes switching (200 kHz–2.2 MHz) |
| 9, 10 VIN | Main input supply | Dual pins reduce IR drop and improve current sharing; connect directly to bulk input capacitor with short traces |
| 11 NC | No-connect | Not internally bonded - must remain unconnected and unstubbed on PCB |
| 12 PGND | Power ground return | Low-side FET source return; ties to CIN/COUT grounds and thermal pad - forms primary current return path |
| PAD | Thermal & ground plane | Exposed copper pad under package; must be soldered to solid ground plane for RθJB = 16.5°C/W thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - certified for front-end cluster and head-unit deployment |
| Integrated MOSFETs | 160 mΩ HS + 95 mΩ LS RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity |
| Soft-start into prebiased output | 6-ms internal soft-start ramp - prevents output voltage overshoot when powering up systems with active downstream loads |
| High-duty-cycle operation | Supports >90% duty cycle via frequency foldback - maintains regulation down to VIN ≈ VOUT + 0.5 V under dropout conditions |
| PFM light-load mode | Enables 75 µA IQ and >85% efficiency at 1 mA load - ideal for always-on CAN transceiver or real-time clock backup rails |
Applications
| Automotive Instrument Cluster | USB-C Charging Module |
|---|---|
Use Scenario: Powers TFT LCD, microcontroller, and CAN interface in digital dashboard with cold-crank resilience. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying core logic and display backlight drivers. Use Value: 36-V max input withstands load-dump transients; 1.5-A rating supports simultaneous GPU rendering and sensor fusion processing. |
Use Scenario: Generates stable 5-V bus for USB-PD sink negotiation and Type-A port power delivery. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 12-V vehicle bus to regulated 5-V USB VBUS. Use Value: PFM mode maintains >80% efficiency at 10-mA standby; EN/SYNC allows synchronized switching with main system clock to reduce conducted EMI. |
| Off-Battery Telematics Unit | Heads-Up Display (HUD) Power |
Use Scenario: Supplies 3.3-V rail for LTE modem, GNSS receiver, and secure element in connected car gateway. IC Role / Device Role / Timing Role: Always-on buck converter with ultra-low IQ for cellular keep-alive and firmware-over-the-air updates. Use Value: 2-µA shutdown current extends battery life during extended parking; internal compensation avoids tuning delays in production test. |
Use Scenario: Provides 5-V and 3.3-V rails for DLP controller, laser driver, and image processor in AR HUD subsystem. IC Role / Device Role / Timing Role: High-efficiency synchronous buck delivering clean, low-noise power to precision analog imaging chain. Use Value: 60-ns min on-time enables 5-V output from 6.5-V input during engine start; wettable flanks ensure IPC-A-610 Class 3 solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625QDRRTQ1 | 2.5-A output current, identical pinout and feature set, same 4–36 V input range | Suitable where future-proofing for higher load (e.g., adding camera ISP) is required without PCB redesign | Select when system peak current exceeds 1.5 A but layout space and thermal margin allow same footprint |
| TPS543320RSAR | 3-A output, 4–18 V input, PMBus interface, adjustable current limit, no integrated BOOT capacitor requirement | Used where digital monitoring, telemetry, or tighter input voltage constraints (e.g., 12-V only systems) apply | Choose when system-level telemetry, dynamic current limiting, or lower VIN max is prioritized over automotive temperature grade |
Compared with LMR23615QDRRTQ1, the LMR23625QDRRTQ1 offers higher current headroom in identical packaging, while the TPS543320RSAR trades automotive qualification for digital configurability and narrower input range - making the LMR23615QDRRTQ1 optimal for cost-sensitive, thermally constrained AEC-Q100 Grade 1 applications requiring 1.5-A output.
Availability
LMR23615QDRRTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, USB charging, and off-battery telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LMR23615QDRRTQ1 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 automotive, industrial, and consumer markets.
The LMR23615QDRRTQ1 belongs to TI's SIMPLE SWITCHER® automotive-grade DC/DC converter family, designed specifically for robust, low-EMI, easy-to-deploy power solutions in safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage rating for the LMR23615QDRRTQ1?
The LMR23615QDRRTQ1 has an absolute maximum input voltage rating of 42 V, with recommended operating range from 4 V to 36 V. This allows direct connection to 12-V and 24-V automotive batteries while surviving load-dump transients up to ISO 7637-2 Pulse 5a (35 V, 400 ms). Operation beyond 36 V is not recommended for continuous use due to increased thermal stress and reduced reliability margin.
Does the LMR23615QDRRTQ1 require external compensation components?
No, the LMR23615QDRRTQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces bill-of-materials count, and ensures stable operation across all supported output voltages (1 V to 28 V) and output capacitors - including all-ceramic configurations - without manual loop tuning.
How does the EN/SYNC pin function in the LMR23615QDRRTQ1?
The EN/SYNC pin on the LMR23615QDRRTQ1 serves dual functions: as a precision enable input (1.55 V typical turn-on threshold) and as a synchronization interface. When driven with a DC voltage >1.55 V, it enables regulation; when AC-coupled with a 2.8–5.5 V external clock signal (200 kHz–2.2 MHz), it locks the internal oscillator to that frequency - reducing EMI peaks and enabling deterministic timing in multi-rail systems.
What thermal performance can be expected from the LMR23615QDRRTQ1 in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the LMR23615QDRRTQ1's exposed thermal pad soldered to a 4 cm² internal ground plane, junction-to-board thermal resistance (RθJB) is 16.5°C/W. At 1.5-A load and 12-V input, typical power dissipation is ~0.45 W, resulting in ~7.4°C temperature rise above board temperature - well within the –40°C to +125°C operating range when ambient stays below 117°C.
Is the LMR23615QDRRTQ1 compatible with ceramic output capacitors only?
Yes, the LMR23615QDRRTQ1 is optimized for ceramic output capacitors and supports all-ceramic designs without instability. Its internal compensation is tuned for low-ESR outputs; however, if electrolytic or polymer capacitors are used, a feed-forward capacitor (CFF) across the top feedback resistor may be needed to maintain phase margin - per TI's SNVSAS5 datasheet Section 7.3.7.
LMR23615QDRRTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 12-WFDFN 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.425MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-SON (3x3)
LMR23615QDRRTQ1 FAQ
1.How can I place an order for LMR23615QDRRTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23615QDRRTQ1 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 LMR23615QDRRTQ1 reliable?
The price and inventory of LMR23615QDRRTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23615QDRRTQ1 is usually 5 days.
3.What payment methods are accepted for LMR23615QDRRTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23615QDRRTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23615QDRRTQ1?
LMR23615QDRRTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23615QDRRTQ1 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 LMR23615QDRRTQ1?
For technical support, including LMR23615QDRRTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23615QDRRTQ1 requirements.
6.How does Aetrix verify that LMR23615QDRRTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR23615QDRRTQ1 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 LMR23615QDRRTQ1 meets industry standards.
7.What is the process for return or replacement of LMR23615QDRRTQ1?
All LMR23615QDRRTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR23615QDRRTQ1, 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 LMR23615QDRRTQ1 part is unused and in its original packaging.
Return procedure for LMR23615QDRRTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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