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LMR23615DRRR
Texas Instruments
IC REG BUCK ADJ 1.5A 12SON
28337 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 1.5A 12-WFDFN Exposed Pad
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5.0 / 5.0
- (359 Ratings)
LMR23615DRRR
Product Overview
1285043
DiGi Electronics Part Number
LMR23615DRRR-DGManufacturer
Texas Instruments
LMR23615DRRR
Description
IC REG BUCK ADJ 1.5A 12SONInventory
28337 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 1.5A 12-WFDFN Exposed Pad
Quantity
Minimum 1
Minimum 1
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LMR23615DRRR Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
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)
Mounting Type
Surface Mount, Wettable Flank
Package / Case
12-WFDFN Exposed Pad
Supplier Device Package
12-SON (3x3)
Base Product Number
LMR23615
Datasheet & Documents
Manufacturer Product Page
LMR23615DRRR Specifications
HTML Datasheet
LMR23615DRRR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-LMR23615DRRRTR
296-LMR23615DRRRDKR
296-LMR23615DRRRCT
LMR23615DRRR-DG
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
カスタマーサポートの対応力に大変満足しています。いつも親身です。
de desembre 02, 2025
The efficient dispatch process meant I could enjoy my purchases sooner.
de desembre 02, 2025
Their products are reliably consistent, and the price makes it easier to stay within my budget.
de desembre 02, 2025
Their staff’s friendliness adds a personal touch to the shopping experience.
de desembre 02, 2025
DiGi Electronics provides premium quality at an affordable price point, which is rare to find.
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Frequently Asked Questions (FAQ)
Can the LMR23615DRRR safely replace a legacy buck regulator like the LM25011MY in a 24V industrial input application with 5V/1A output, and what layout considerations are critical to avoid instability?
Yes, the LMR23615DRRR can replace the LM25011MY in this scenario due to its wider input range (up to 36V), higher switching frequency (2.425MHz vs. 300kHz), and integrated synchronous rectification, which improves efficiency at light loads. However, the higher switching frequency demands stricter PCB layout: keep the power ground (PGND) and analog ground (AGND) separated with a single-point connection near the exposed pad, minimize loop area in the SW node using a tight Kelvin connection to the inductor, and place input/output capacitors within 2mm of the IC. Failure to follow TI’s recommended layout in the datasheet may cause EMI issues or subharmonic oscillation due to parasitic inductance interacting with the high di/dt switching edges.
What are the thermal risks when using the LMR23615DRRR in a compact enclosure with 30V input, 3.3V output at 1.5A full load, and ambient temperatures up to 85°C, and how can I mitigate junction temperature rise without a heatsink?
At 30V input and 3.3V/1.5A output, the LMR23615DRRR experiences ~0.8W of power dissipation (including switching and conduction losses), which can push junction temperature beyond 125°C in an 85°C ambient if thermal vias under the exposed pad are inadequate. The 12-WFDFN package relies entirely on PCB copper for heat spreading. To mitigate risk, use at least nine 0.3mm thermal vias filled with conductive epoxy under the pad, connect them to a 2-layer minimum internal ground plane, and ensure top-layer copper area ≥ 400mm². Monitor TJ using the thermal resistance θJA ≈ 40°C/W; if measured case temperature exceeds 85°C, derate output current or improve airflow. Avoid placing heat-sensitive components within 5mm of the IC.
How does the LMR23615DRRR compare to the MPQ4572GLE-11-Z from Monolithic Power Systems for automotive-grade 12V-to-5V conversion, especially regarding EMI performance and cold-cranking compatibility?
The LMR23615DRRR outperforms the MPQ4572GLE-11-Z in cold-cranking scenarios due to its 4V minimum input voltage (vs. 4.5V for the MPQ4572), making it more robust during deep battery sags in automotive start-stop systems. However, the MPQ4572 has a lower 1.1MHz switching frequency, which eases EMI filtering in CISPR 25 Class 5 tests. The LMR23615’s 2.425MHz operation requires careful snubber design and spread-spectrum modulation (not supported here) to meet stringent EMI limits. For automotive use, ensure the LMR23615DRRR is qualified to AEC-Q100 (it is not, unlike the MPQ4572), so it’s better suited for industrial automotive sub-systems rather than under-hood applications requiring full compliance.
What output voltage accuracy and transient response issues should I expect when using the LMR23615DRRR with ceramic capacitors only, and how does this impact dynamic load applications like FPGA power rails?
The LMR23615DRRR can exhibit poor transient response and output voltage overshoot when using only low-ESR ceramic output capacitors (e.g., X5R/X7R), especially during fast load steps from 0.1A to 1.5A common in FPGA cores. This occurs because the control loop lacks sufficient phase margin with ultra-low ESR caps, potentially causing >200mV spikes. To stabilize the system, add a small series resistor (10–47mΩ) in line with the output capacitor or use a hybrid approach: one 10µF ceramic + one 47µF polymer capacitor. TI’s WEBENCH model recommends a minimum effective ESR of 5mΩ for stability. Always validate transient response with a 1A/µs load step during prototype testing to avoid functional failures in sensitive digital loads.
Is it safe to parallel two LMR23615DRRR devices for higher current (3A total), and what synchronization or current-sharing techniques are required to prevent thermal runaway?
Paralleling LMR23615DRRR devices is not recommended without external current-sharing circuitry, as the IC lacks master-slave sync or inherent current balancing. Even minor differences in feedback thresholds (±2%) or PCB trace resistance can cause one device to carry >70% of the load, leading to localized overheating and premature failure. If higher current is needed, consider stepping up to a dedicated multi-phase controller like the TPS546C23 or using a single higher-current part such as the LMR23630 (3A). If paralleling is unavoidable, add 50–100mΩ ballast resistors in series with each SW output and ensure matched trace lengths and thermal coupling—but expect reduced efficiency (~5% drop) and increased board complexity with marginal reliability gains.
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LMR23615DRRR CAD Models
Texas Instruments LMR23615DRRR PCB symbols & footprints
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