Hello! now
tms@lcdchip.com
Texas Instruments LM25085MYX/NOPB
- Part No.:
- LM25085MYX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- DC DC Switching Controllers
- Package:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Description:
- IC REG CTRLR BUCK 8MSOP
- Quantity:
Unit Price:$1.77
Ext Price:$1.77
- Payment:
- Shipping:
Product Details
LM25085MYX/NOPB - 42 V Constant On-Time PFET Buck Controller
LM25085MYX/NOPB from Texas Instruments is a wide-input, nonsynchronous PFET buck controller for compact step-down power supplies. It combines a 4.5 V to 42 V input range, constant on-time regulation, an integrated high-voltage bias regulator, adjustable current limiting, and operation up to 1 MHz.
The MYX/NOPB ordering code specifies the 8-pin HVSSOP PowerPAD (DGN) large tape-and-reel option with 3,500 devices per reel.
Overview
The LM25085MYX/NOPB drives an external P-channel MOSFET to implement a positive-output buck regulator. Its constant on-time control method does not require a conventional loop-compensation network and provides fast response to load changes. The PFET architecture supports 100% duty-cycle operation for low dropout when the input approaches the programmed output voltage.
Key Advantages
Supports step-down conversion from automotive, industrial, telecom, and distributed DC rails within the device ratings.
No conventional loop-compensation network is required, reducing component count and simplifying regulator implementation.
The control architecture reacts quickly to load changes while maintaining a nearly constant frequency as line and load vary.
The P-channel high-side switch architecture permits 100% duty-cycle operation when the input and output voltages converge.
Feature Summary
An external resistor from VIN to RT sets on-time and supports switching frequencies up to 1 MHz.
Overcurrent detection can use the external PFET's RDS(ON) or a dedicated current-sense resistor.
An integrated high-voltage bias regulator supplies the gate driver, and the internal soft-start timer manages startup.
The controller includes overvoltage comparison, current-limit detection, shutdown control, and thermal shutdown.
Package & Footprint
LM25085MYX/NOPB uses TI's 8-pin HVSSOP PowerPAD (DGN) package with an exposed pad. The customer package registry maps the database description to the primary normalized name 8-PowerTSSOP. The MYX carrier is a 3,500-piece large tape-and-reel.
- Use the current TI DGN package drawing and land pattern for pad geometry and pin-1 orientation.
- Solder the exposed pad to the PCB ground plane with an appropriate thermal-via pattern.
- Keep the VIN bypass capacitor and VIN-to-VCC capacitor close to their pins.
- Route PGATE, ISEN, and the high-current switching loop compactly while keeping FB and RT away from noisy switching nodes.
The registered package JPG is currently missing and must be added before publication. Verify the PowerPAD stencil, solder coverage, and thermal design against TI's latest mechanical information.
Pin Functions
The following mapping applies to the 8-lead DGN HVSSOP PowerPAD package, top view.
Pin functions differ among DGN, DGK, and NGQ package drawings. Confirm the exact MYX/NOPB DGN top view before PCB layout or substitution.
Key Specifications
| Orderable Part Number | LM25085MYX/NOPB |
|---|---|
| Manufacturer | Texas Instruments |
| Function | Nonsynchronous P-channel MOSFET buck controller |
| Control Mode | Constant on-time |
| Input Voltage Range | 4.5 V to 42 V |
| Adjustable Output Voltage | From 1.25 V |
| Feedback Reference | 1.25 V nominal, ±2% |
| Switching Frequency | Programmable up to 1 MHz |
| Maximum Duty Cycle | 100% |
| Quiescent Current | 1.25 mA typical |
| Current Limit | Adjustable using PFET RDS(ON) or an external sense resistor |
| Operating Temperature | −40 °C to +125 °C |
| Package | 8-pin HVSSOP PowerPAD (DGN) |
| Standard Reel Quantity | 3,500 pieces |
External power-stage components determine the regulator's practical output-current, voltage, efficiency, thermal, and transient limits. Use the complete TI electrical-characteristics and application-design sections for worst-case calculations.
Replacement Considerations
TI offers several LM25085 ordering and family options. Confirm the exact reference voltage, qualification, package drawing, exposed pad, and carrier before substitution.
- LM25085MY/NOPB: Same catalog controller and DGN PowerPAD package in a 1,000-piece small tape-and-reel. This is the closest functional and footprint match when carrier quantity can change.
- LM25085MYE/NOPB: Same controller and DGN package in a 250-piece small tape-and-reel. Review feeder and purchasing requirements.
- LM25085QMYX/NOPB: Automotive-grade ordering option in the DGN package and 3,500-piece carrier. Confirm AEC-Q100 documentation, marking, approved-vendor requirements, and controlled package data.
- LM25085AMYX/NOPB: Related LM25085A controller with a 0.9 V feedback reference instead of 1.25 V. Feedback-divider values and operating behavior must be redesigned and validated.
- LM25085MMX/NOPB: Same base controller in an 8-pin VSSOP (DGK) package without the DGN PowerPAD footprint. PCB and thermal changes are required.
- LM25085SD/NOPB: Same base controller in an 8-pin WSON (NGQ) package. It requires a different land pattern and assembly process.
Recheck the exact pin drawing, reference voltage, current-sense implementation, thermal pad, qualification level, marking, and reel quantity before approving a replacement.
Manufacturer Information
Texas Instruments lists LM25085MYX/NOPB as an active catalog device. This summary uses the exact TI orderable-part record and the LM25085/LM25085-Q1 datasheet, document SNVS593J.
- Exact package: HVSSOP PowerPAD, drawing DGN, 8 pins.
- Ordering: MYX/NOPB is the 3,500-piece large-reel catalog option.
- Assembly data: TI lists Sn lead finish, MSL 1 at 260 °C peak reflow, RoHS compliance, and device marking SVYB.
Applications
Industrial Step-Down Supplies
Wide-input buck conversion for controllers, sensors, communications equipment, and distributed DC systems.
Vehicle Power Rails
Catalog-grade control for appropriate vehicle-related designs; use the Q1 option when automotive qualification is required.
Battery-Powered Systems
Efficient step-down conversion with low-dropout 100% duty-cycle capability when input voltage approaches the output.
Compact Point-of-Load Rails
High-frequency designs where a small external PFET buck stage and rapid transient response are required.
Quality & Authenticity
- Identity: verify the full LM25085MYX/NOPB ordering code, DGN PowerPAD package, SVYB marking, reel label, and pin-1 orientation.
- Traceability: retain supplier, lot, date-code, and packaging records required by the procurement specification.
- Handling: follow TI guidance for ESD, moisture sensitivity, storage, reflow, and exposed-pad assembly.
- Inspection: compare markings and package dimensions with controlled TI data rather than product photographs alone.
FAQ
What distinguishes LM25085MYX/NOPB from LM25085MY/NOPB?
Does LM25085MYX/NOPB contain the power MOSFET?
Why does this controller not require loop compensation?
Can LM25085AMYX/NOPB replace this device directly?
Engineering Notice
LM25085MYX/NOPB Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 ~ 42V
- Frequency - Switching:
- Up to 1MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
- Include Parts
- Popular Search
The following parts include "LM25085MYX/NOPB" in Silicon Labs LM25085MYX/NOPB.
- Part Number
- Manufacturer
- Package
- Description
- UCC28C45DR Texas Instruments 8-SOIC (0.154", 3.90mm Width) IC REG CTRLR MULT TOPOLOGY 8SOIC
- UCC28C40DR Texas Instruments 8-SOIC (0.154", 3.90mm Width) IC REG CTRLR MULT TOPOLOGY 8SOIC
- UCC28C43DR Texas Instruments 8-SOIC (0.154", 3.90mm Width) IC REG CTRLR MULT TOPOLOGY 8SOIC
- ZXSC410E6TA Diodes Incorporated SOT-23-6 IC REG CTRLR BOOST SOT23-6
- LM3524DMX/NOPB Texas Instruments 16-SOIC (0.154", 3.90mm Width) IC REG CTRLR BUCK/BOOST 16SOIC
- LM3489MMX/NOPB Texas Instruments 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) IC REG CTRLR BUCK 8VSSOP
- MIC2102YML-TR Microchip Technology 16-VFQFN Exposed Pad IC REG CTRLR BUCK 16MLF
- LM5148RGYR Texas Instruments 24-VFQFN Exposed Pad 3.5-V TO 80-V, CURRENT MODE SYNC
- TL598CDR Texas Instruments 16-SOIC (0.154", 3.90mm Width) IC REG CTRLR MULT TOP 16SOIC
- LM5155DSSR Texas Instruments 12-WFDFN Exposed Pad POWER MANAGEMENT
The following parts are popular search parts in Test and Measurement.
Inventory:0
Please send an inquiry. Send us your inquiry, and we will respond immediately.
In Stock:0
| Qty. | Unit Price | Ext. Price |
| 1+ | $1.77 | $1.77 |
| 10+ | $1.31 | $13.10 |
| 25+ | $1.20 | $30.00 |
| 100+ | $1.07 | $107.00 |
| 250+ | $1.01 | $252.50 |
| 500+ | $0.98 | $490.00 |
| 3500+ | $0.91 | $3185.00 |
| 7000+ | $0.89 | $6230.00 |
