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Texas Instruments LMR23610AQDDAQ1
- Part No.:
- LMR23610AQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23610AQDDAQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:777
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Product details
Overview
LMR23610AQDDAQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering 1 A continuous output current with 4 V to 36 V input range, fixed 400 kHz switching frequency (synchronizable up to 2.2 MHz), and 75 µA quiescent current - designed for automotive battery regulation and industrial power supplies requiring high reliability under -40 °C to 125 °C ambient conditions.
For engineers reviewing the LMR23610AQDDAQ1 datasheet, LMR23610AQDDAQ1 pinout, LMR23610AQDDAQ1 application, or LMR23610AQDDAQ1 equivalent, key selection considerations include its integrated high-side/low-side MOSFETs (RDS(on) = 185 mΩ / 105 mΩ), internal compensation, PFM light-load mode, precision enable with UVLO hysteresis, and thermal shutdown with 170 °C trip point.
Technical Context
The LMR23610AQDDAQ1 employs peak current mode control with fixed 400 kHz nominal switching frequency and automatic transition to PFM mode below ~100 mA load to maintain >85% efficiency at 10 µA IOUT. Its internal loop compensation eliminates external compensation components while supporting stable operation with ceramic output capacitors as low as 47 µF × 2.
It integrates a 4.1 V internal LDO for gate drivers and control circuitry, uses a bootstrap capacitor (100 nF) between BOOT and SW for high-side drive, and features cycle-by-cycle current limiting (HS peak limit = 2.0 A typ, LS valley limit = 1.5 A typ) plus hiccup-mode short-circuit protection triggered after 64 consecutive current-limit cycles.
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) and industrial 24 V rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs. |
| Switching Frequency | 400 kHz default, synchronizable 200 kHz–2.2 MHz - enables EMI optimization and avoids AM radio band; foldback extends dropout capability at low VIN. |
| Quiescent Current | 75 µA in PFM mode - enables >10-year battery life in always-on automotive modules (e.g., telematics, body control units). |
| Feedback Reference | 1.0 V ±20 mV over -40 °C to 125 °C - ensures <±1.5% output voltage accuracy across temperature with 1% resistors. |
| Thermal Protection | 170 °C shutdown with 15 °C hysteresis - prevents damage during sustained overload or poor PCB heatsinking; thermal pad (Pin 9) must be connected to ground plane. |
| Enable Threshold | 1.55 V rising, 0.4 V hysteresis - allows precise system-level UVLO using resistor divider; EN pin doubles as SYNC input via AC coupling. |
Pinout & Package
Package: 8-pin HSOIC with exposed thermal pad (DDA), body size 4.9 mm × 3.9 mm, RθJA = 42.0 °C/W - requires soldered thermal pad to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries high di/dt switching current; must minimize trace length and loop area for EMI control. |
| BOOT (2) | Bootstrap supply | Requires 100 nF ceramic capacitor to SW; enables high-side NMOS gate drive above VIN. |
| VCC (3) | Internal LDO output | Bypass with 2.2 µF/16 V ceramic to AGND; no external load permitted - powers internal logic and drivers. |
| FB (4) | Feedback input | Connects to resistor divider tap; 1.0 V reference sets VOUT; feedforward capacitor (CFF) recommended for transient response. |
| EN/SYNC (5) | Enable & sync input | Logic-high (>1.55 V) enables regulator; AC-coupled external clock (2.8–5.5 V, 200 kHz–2.2 MHz) synchronizes switching. |
| AGND (6) | Analog ground | Reference for FB, EN, internal references; separate from PGND but tied at single point near VCC bypass cap. |
| VIN (7) | Main input supply | 4–36 V input; requires local 10 µF ceramic input capacitor close to VIN and PGND pins. |
| PGND (8) | Power ground | Low-side FET source return; connects to CIN, COUT, and thermal pad; shortest possible path to minimize noise. |
| Thermal Pad (9) | Die thermal sink | Exposed copper pad on bottom; must be soldered to large PCB ground plane - primary heat dissipation path (RθJC(bot) = 3.6 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40 °C to 125 °C ambient operation, HBM ±2000 V, CDM ±1000 V - meets automotive electronics reliability requirements. |
| Integrated synchronous MOSFETs | 185 mΩ high-side + 105 mΩ low-side RDS(on) - eliminates external rectifier losses, improves full-load efficiency by ~5% vs. asynchronous designs. |
| Internal compensation | No external compensation network required - reduces BOM count, simplifies layout, and guarantees stability with standard output capacitor types. |
| Soft-start into pre-biased output | 1–3 ms internal soft-start time with pre-bias tolerance - prevents reverse current flow when powering already-charged rails (e.g., hot-swap systems). |
| Hiccup-mode short-circuit protection | Enters 5 ms retry cycle after 64 current-limit events - limits average power dissipation during sustained fault, enabling safe auto-recovery. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Powering ADAS camera modules and radar ECUs directly from 12 V battery with cold-crank immunity (down to 4 V). IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V or 5 V rail; handles wide VIN transients and meets ASIL-B functional safety support requirements. Use Value: 75 µA quiescent current extends vehicle battery life during extended parking; AEC-Q100 qualification ensures field reliability over 15-year automotive lifecycle. | Use Scenario: Converting 24 V factory automation bus to 5 V for PLC I/O modules and industrial sensors. IC Role / Device Role / Timing Role: High-efficiency, compact DC-DC stage replacing linear regulators; operates continuously at 60 °C ambient with minimal derating. Use Value: Integrated MOSFETs and internal compensation reduce solution footprint by 40% vs. controller+external FET designs; 42 °C/W θJA enables convection-cooled operation. |
| Telecom/Datacom Systems | General Purpose Wide Vin Regulation |
Use Scenario: Point-of-load conversion in 48 V telecom shelf systems where intermediate 12 V or 5 V rails power FPGA and SerDes interfaces. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock (via EN/SYNC pin) to suppress beat frequencies and meet strict EMI Class B limits. Use Value: 200–2200 kHz sync range allows alignment with master clock; PFM mode maintains >80% efficiency at 100 µA load for standby circuits. | Use Scenario: Universal input power for test equipment, medical monitors, and portable instrumentation accepting 9–36 V DC inputs. IC Role / Device Role / Timing Role: Single-chip solution eliminating need for external controllers, drivers, and compensation - accelerates design-in and reduces qualification effort. Use Value: 1 A output with 60 ns minimum on-time supports high-duty-cycle operation (e.g., 5 V out from 8 V in); frequency foldback maintains regulation down to 5.5 V VIN. |
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 |
|---|---|---|---|
| LMR23615AQDDAQ1 | 1.5 A output current, identical pinout and package - higher current headroom with same PCB layout. | Required where peak loads exceed 1 A (e.g., motor driver bias rails) but thermal margin is constrained. | Select when future-proofing for higher load or when operating near 1 A thermal limit at high ambient. |
| TPS543320RTWR | 3 A output, 2.2 V to 18 V input, PMBus interface, adjustable soft-start - more complex but digitally configurable. | Suitable for systems needing telemetry, dynamic voltage scaling, or multi-rail sequencing not supported by LMR23610AQDDAQ1. | Choose only if digital control, remote monitoring, or tighter output accuracy (<±0.5%) is mandatory. |
Compared with LMR23610AQDDAQ1, the LMR23615AQDDAQ1 offers plug-compatible current scalability, while the TPS543320RTWR trades simplicity for configurability and higher current - neither provides drop-in replacement without design review due to differing input ranges and feature sets.
Availability
LMR23610AQDDAQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, telecom/datacom systems, and general-purpose wide-Vin regulation requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LMR23610AQDDAQ1 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 DLP technology for industrial, automotive, and consumer markets.
The LMR23610AQDDAQ1 belongs to TI's SIMPLE SWITCHER® automotive-grade DC-DC converter family, engineered specifically for robust, low-risk power design in safety-critical automotive and harsh-environment industrial applications.
FAQ
What is the maximum input voltage rating for the LMR23610AQDDAQ1?
The LMR23610AQDDAQ1 has an absolute maximum input voltage of 42 V, but its recommended operating input range is 4 V to 36 V. Operation above 36 V risks exceeding thermal limits and violating AEC-Q100 stress conditions. The device includes input UVLO with 3.7 V rising threshold and 0.4 V hysteresis to prevent erratic startup during brownout conditions.
Does the LMR23610AQDDAQ1 require external compensation components?
No, the LMR23610AQDDAQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and guarantees stability across the full output voltage range (1 V to 28 V) and with common ceramic output capacitors. A feedforward capacitor (CFF) across the top feedback resistor is optional for improved transient response.
How does the LMR23610AQDDAQ1 handle short-circuit conditions?
The LMR23610AQDDAQ1 responds to output short circuits with hiccup-mode protection: after 64 consecutive cycles of valley current limit detection, it shuts down for 5 ms before attempting restart. This limits average power dissipation to safe levels, prevents thermal runaway, and enables automatic recovery once the fault clears - critical for unattended automotive and industrial systems.
Can the LMR23610AQDDAQ1 be synchronized to an external clock?
Yes, the EN/SYNC pin of the LMR23610AQDDAQ1 accepts AC-coupled external clock signals from 200 kHz to 2.2 MHz. A 1 nF coupling capacitor and ≥2.8 V peak-to-peak sync pulse amplitude are required. This capability allows EMI reduction through frequency dithering or alignment with system clocks - essential for compliance in automotive EMC testing (e.g., CISPR 25 Class 5).
What is the role of the thermal pad (Pin 9) on the LMR23610AQDDAQ1 package?
The thermal pad (Pin 9) on the LMR23610AQDDAQ1 is a low-impedance junction-to-board thermal path (RθJC(bot) = 3.6 °C/W) that must be soldered to a large PCB ground plane. It serves as the primary heat dissipation route - omitting or undersizing this pad increases junction temperature by >30 °C at 1 A load, risking thermal shutdown or accelerated aging. TI recommends ≥4×4 mm2 copper area with ≥4 thermal vias.
LMR23610AQDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR23610AQDDAQ1 FAQ
1.How can I place an order for LMR23610AQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23610AQDDAQ1 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 LMR23610AQDDAQ1 reliable?
The price and inventory of LMR23610AQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23610AQDDAQ1 is usually 5 days.
3.What payment methods are accepted for LMR23610AQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23610AQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23610AQDDAQ1?
LMR23610AQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23610AQDDAQ1 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 LMR23610AQDDAQ1?
For technical support, including LMR23610AQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23610AQDDAQ1 requirements.
6.How does Aetrix verify that LMR23610AQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All LMR23610AQDDAQ1 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 LMR23610AQDDAQ1 meets industry standards.
7.What is the process for return or replacement of LMR23610AQDDAQ1?
All LMR23610AQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR23610AQDDAQ1, 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 LMR23610AQDDAQ1 part is unused and in its original packaging.
Return procedure for LMR23610AQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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