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LM5085SDX/NOPB
Texas Instruments
IC REG CTRLR BUCK 8WSON
406953 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 8-WSON (3x3)
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Minimum 1
5.0 / 5.0
- (403 Ratings)
LM5085SDX/NOPB
Product Overview
1324780
DiGi Electronics Part Number
LM5085SDX/NOPB-DGManufacturer
Texas Instruments
LM5085SDX/NOPB
Description
IC REG CTRLR BUCK 8WSONInventory
406953 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 8-WSON (3x3)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM5085SDX/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
-
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
4.5V ~ 75V
Frequency - Switching
Up to 1MHz
Duty Cycle (Max)
100%
Synchronous Rectifier
No
Clock Sync
No
Serial Interfaces
-
Control Features
Current Limit, Enable, On Time Control
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
8-WFDFN Exposed Pad
Supplier Device Package
8-WSON (3x3)
Base Product Number
LM5085
Datasheet & Documents
HTML Datasheet
LM5085SDX/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM5085SDX-DG
LM5085SDX
Standard Package
4,500
Alternative Parts
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
包裝細緻，物流快捷，讓我每次都能高興地收到商品。
de desembre 02, 2025
他們的售後服務回應迅速，不管遇到什麼問題都能得到很好的解決，非常滿意。
de desembre 02, 2025
Une excellente expérience d’achat avec des produits de qualité à des prix justes.
de desembre 02, 2025
Their after-sales support makes troubleshooting easy and stress-free.
de desembre 02, 2025
The affordability of DiGi Electronics didn't compromise their packaging excellence.
de desembre 02, 2025
I appreciate the honesty in their pricing, which fosters a lasting relationship of trust.
de desembre 02, 2025
DiGi Electronics provides exceptional packaging that ensures products arrive in pristine condition, preventing any damage during transit.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LM5085SDX/NOPB in a high-input-voltage industrial power supply, and how can they be mitigated?
When using the LM5085SDX/NOPB in high-input-voltage applications (up to 75V), one major risk is overshoot during startup or load transients due to the fixed on-time architecture. This can stress external MOSFETs and output components. To mitigate this, carefully size the timing capacitor and ensure the minimum off-time is sufficient at high VIN to maintain stable switching. Additionally, use a robust bootstrap circuit for the high-side gate drive and implement proper PCB layout with short, direct paths for the switch node to minimize EMI and parasitic inductance. Always verify stability with load-step testing across temperature and input ranges.
Can the LM5085SDX/NOPB replace the LM5085SD/NOPB in an existing design without changes to the layout or BOM?
Yes, the LM5085SDX/NOPB can directly replace the LM5085SD/NOPB — both are functionally identical and housed in the same 8-WSON (3x3) package. The 'X' in the part number typically denotes tape-and-reel packaging for automated assembly, not a functional difference. No layout or BOM changes are needed. However, confirm the enable threshold and current limit settings are appropriate for your system, as batch-to-batch variations in external components could affect startup behavior under low-temperature conditions.
How does the LM5085SDX/NOPB compare to the LM5106-based controller in terms of efficiency and thermal performance in a 48V telecom buck converter?
The LM5085SDX/NOPB offers an integrated on-time control for simple 48V-to-lower-voltage conversion without needing a feedback loop compensation network, simplifying design versus the LM5106, which requires external compensation. However, the LM5106 provides more flexibility with adjustable frequency and dual gate drives for interleaved phases. For single-phase designs operating below 500kHz, the LM5085SDX/NOPB can achieve comparable efficiency, especially with low-QG MOSFETs. Thermally, the LM5085SDX/NOPB's 8-WSON package requires proper thermal vias under the exposed pad to keep junction temperature within limits under continuous load, especially above 85°C ambient.
What are the implications of the LM5085SDX/NOPB's 100% duty cycle capability in a power hold-up or battery backup application?
The 100% duty cycle capability of the LM5085SDX/NOPB allows the high-side MOSFET to remain on continuously, which is critical in brownout or hold-up scenarios where input voltage drops close to the regulated output. This ensures uninterrupted output regulation during brief input sags. However, in this mode, no energy is transferred through the inductor, effectively turning off switching until VIN recovers. Designers must ensure the output capacitor bank is sufficiently sized to support load current during extended low-VIN events. Also, thermal stress on the MOSFET increases in linear mode, so select a device with good SOA (Safe Operating Area) performance.
What layout and gate drive considerations are critical when integrating the LM5085SDX/NOPB in a high-switching-frequency buck converter?
When operating the LM5085SDX/NOPB near its maximum switching frequency (up to 1MHz), gate drive loop inductance becomes a critical factor. Use low-inductance, short PCB traces between the HO pin and the high-side MOSFET gate, and include a low-value gate resistor (2–10Ω) close to the MOSFET to dampen ringing. Place the bootstrap capacitor (typically 0.1µF ceramic) as close as possible between HO and SW with minimal loop area. Use a 10V Zener diode from HO to GND for overvoltage protection if MOSFET VGS rating is tight. Finally, ensure the exposed thermal pad is solidly connected to a ground plane with multiple vias to improve both thermal and electrical performance.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM5085SDX/NOPB CAD Models
Texas Instruments LM5085SDX/NOPB PCB symbols & footprints
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