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Texas Instruments SM72485MMX/NOPB
- Part No.:
- SM72485MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
SM72485MMX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,182
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Product details
Overview
SM72485MMX/NOPB from Texas Instruments is a 100-V, 150-mA constant on-time buck switching regulator with integrated 100-V N-channel buck switch, 6 V to 95 V input range, and adjustable 2.5 V reference-based output voltage - used in PV panel junction boxes, 42-V automotive systems, and telecom post-regulation.
For engineers reviewing the SM72485MMX/NOPB datasheet, SM72485MMX/NOPB pinout, SM72485MMX/NOPB application, or SM72485MMX/NOPB equivalent, key selection criteria include input voltage range (6–95 V), no-loop-compensation operation, intelligent current limit with RCL-programmable off-time, thermal shutdown at 165°C, and dual-package availability (VSSOP-8 and WSON-8).
Technical Context
The SM72485MMX/NOPB implements a constant on-time control architecture where tON ∝ 1/VIN, enabling stable operating frequency across line and load variations without external compensation. Its regulation relies on a 2.5 V internal reference compared against FB voltage, with overvoltage protection triggered at 2.875 V.
Current limiting uses a forced off-time generator whose duration is inversely proportional to VFB and set by RCL, delivering 35 µs maximum off-time during short-circuit conditions. The integrated bootstrap gate driver supports high-side N-channel switching via BST–SW capacitor charging during SW low periods, with precharge switch activation for light-load reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports wide-range industrial, PV, and 42-V automotive inputs without external step-down. |
| Output Current | 150 mA max - sufficient for bias rails in telecom, junction box controllers, and auxiliary power supplies. |
| Internal Reference | 2.5 V ±20 mV - sets precise feedback threshold; enables output voltage programming via RFB1/RFB2 divider. |
| Switch RDS(ON) | 2.2 Ω (typ) - low conduction loss at 100-V rating; enables efficient operation up to 95-V input. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects device under overload or poor heatsinking; resumes at ~140°C. |
| Minimum On-Time | 400 ns at 95 V - constrains maximum switching frequency; ensures reliable current limit detection. |
| Startup Regulator | VCC regulated at 7 V (VIN > 8.5 V); bypass mode below 8.5 V - eliminates need for external bias supply. |
Pinout & Package
SM72485MMX/NOPB is available in 8-pin VSSOP (3.0 mm × 3.0 mm) and 8-pin WSON (4.0 mm × 4.0 mm) packages, both featuring an exposed thermal pad connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Power Switch Node | Connects to inductor, freewheeling diode, and bootstrap capacitor; carries full switching current and high dv/dt. |
| BST | Bootstrap Supply | Drives high-side gate via external 0.01-µF ceramic cap to SW; internal diode charges cap during SW low phase. |
| FB | Feedback Input | Inverting input of regulation comparator; referenced to 2.5 V; requires ≤100 nA bias current and ≥25 mV ripple for stable operation. |
| RCL | Current Limit Off-Time Set | Resistor-to-GND sets forced off-time duration during overcurrent; 35 µs max when FB = 0 V (short-circuit). |
| RT/SD | On-Time Set / Shutdown | Resistor-to-VIN programs tON; pulled low disables regulator - no external pull-up required for shutdown control. |
| VIN | Main Power Input | Accepts 6–95 V DC; powers internal startup regulator and provides energy to buck stage; withstands 100-V transients. |
| VCC | Gate Drive Supply | Internally regulated 7-V rail; powers gate driver and logic; requires 0.47-µF local decoupling; current-limited to 9.2 mA. |
| RTN | Signal Ground | Reference return for FB, RCL, RT/SD, and internal comparators; must be low-impedance connection to system ground. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time control eliminates external compensation network - reduces BOM count and layout sensitivity. |
| Ultra-fast transient response | On-time adjustment per cycle enables immediate reaction to load steps - maintains tight regulation without output capacitor oversizing. |
| Intelligent current limit | Off-time scales with VFB to minimize foldback during partial overloads - improves recovery time and start-up robustness. |
| Integrated 100-V N-channel switch | Eliminates external MOSFET and driver - simplifies design, reduces footprint, and guarantees matched timing and protection. |
| Precharge switch for BST | 150-ns activation during minimum off-time ensures bootstrap capacitor retains sufficient voltage - prevents gate drive dropout at light loads. |
Applications
| PV Panel Smart Junction Boxes | Nonisolated Telecommunication Buck Regulator |
|---|---|
Use Scenario: Distributed DC-DC conversion inside photovoltaic module-level power electronics, regulating string voltage down to 12–24 V for monitoring ICs and communication interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing MPPT auxiliary power; operates directly from unregulated PV string voltage (up to 95 V). Use Value: Enables direct high-voltage input handling without pre-regulator stages, reducing component count and improving system efficiency at partial shading conditions. | Use Scenario: Intermediate bus regulation in telecom equipment, converting 48-V backplane to 3.3 V or 5 V for digital logic and interface ICs. IC Role / Device Role / Timing Role: Nonisolated secondary regulator providing clean, tightly regulated bias rails; operates in continuous conduction mode under steady load. Use Value: Delivers stable output with minimal external components - avoids complexity of isolated flyback designs while meeting telecom ripple and transient requirements. |
| Secondary High Voltage Post Regulator | 42-V Automotive Systems |
Use Scenario: Down-conversion after high-efficiency front-end converters (e.g., LLC or phase-shifted full-bridge), generating low-noise 12-V or 5-V rails for sensors and microcontrollers. IC Role / Device Role / Timing Role: Precision post-regulator ensuring output stability despite upstream converter ripple and line variation. Use Value: Maintains regulation accuracy via 2.5 V reference and fast on-time response - critical for noise-sensitive analog and RF subsystems. | Use Scenario: Powering infotainment, ADAS camera modules, or body control units from next-generation 42-V vehicle electrical architecture. IC Role / Device Role / Timing Role: High-input-voltage buck regulator supporting cold-crank (6 V) to load-dump (95 V) extremes in automotive environments. Use Value: Integrated 100-V switch and thermal shutdown ensure reliable operation across full automotive temperature range (–40°C to 125°C junction). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65 V input, 150 mA, integrated 100-V FET, but uses peak-current-mode control requiring compensation. | Requires external RC compensation; less tolerant of ESR variation in output capacitor than SM72485MMX/NOPB's constant-on-time scheme. | Preferred when tighter current-sense accuracy or synchronization capability is needed; not drop-in due to different control architecture. |
| TPS54160AIDR | 3.5–60 V input, 1.5-A output, external MOSFET, requires loop compensation and external current sense. | Higher output current but larger solution size; lacks integrated high-voltage switch and intelligent current limit. | Selected when >150 mA load or programmable soft-start is mandatory; not suitable for direct 95-V input without pre-regulation. |
Compared with LM5164QPWPRQ1 and TPS54160AIDR, SM72485MMX/NOPB offers simpler implementation for 6–95 V inputs with no compensation, faster transient response, and built-in short-circuit protection - making it optimal for space-constrained, high-reliability bias supply applications where input voltage exceeds 60 V.
Availability
SM72485MMX/NOPB is available at Aetrix Electronics and suitable for PV junction box controllers, 42-V automotive ECUs, telecom bias supplies, and industrial high-voltage post-regulators requiring stable component supply and long-term manufacturability.
Supply support for SM72485MMX/NOPB 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, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The SM72485MMX/NOPB belongs to TI's high-voltage DC-DC regulator product line, designed specifically for cost-sensitive, high-input-voltage applications such as solar energy systems, telecom infrastructure, and next-generation automotive electrical architectures.
FAQ
What is the absolute maximum input voltage rating for SM72485MMX/NOPB?
The SM72485MMX/NOPB has an absolute maximum VIN-to-GND rating of 100 V, with recommended operating range from 6 V to 95 V. This allows safe operation under transient overvoltage events common in PV and automotive systems, while maintaining reliable regulation across the full 6–95 V range during normal use. Exceeding 100 V may cause permanent damage.
Does SM72485MMX/NOPB require external loop compensation components?
No, SM72485MMX/NOPB does not require external loop compensation components. Its constant on-time control architecture - where on-time varies inversely with input voltage - inherently stabilizes the control loop without feedback compensation networks. This eliminates the need for external resistors, capacitors, or op-amps typically used in voltage-mode or current-mode regulators.
How is the output voltage programmed on SM72485MMX/NOPB?
The output voltage of SM72485MMX/NOPB is programmed using two external resistors (RFB1 and RFB2) forming a voltage divider from VOUT to GND, with the FB pin connected to their junction. The formula is VOUT = 2.5 V × (RFB1 + RFB2) / RFB1. For example, RFB1 = 1 kΩ and RFB2 = 3.01 kΩ yields 10 V output. FB bias current is only 100 nA, minimizing divider error.
What package options are available for SM72485MMX/NOPB?
SM72485MMX/NOPB is offered in two thermally optimized packages: 8-pin VSSOP (3.0 mm × 3.0 mm) and 8-pin WSON (4.0 mm × 4.0 mm), both with an exposed thermal pad that must be soldered to a PCB ground plane. The WSON variant provides lower thermal resistance (RθJA = 42.3°C/W vs. 139.6°C/W for VSSOP), making it preferred for higher ambient temperature or higher load applications.
Can SM72485MMX/NOPB be remotely shut down, and how?
Yes, SM72485MMX/NOPB supports remote shutdown via the RT/SD pin. Driving this pin to GND disables the regulator, reducing quiescent current to 110–176 µA. No external pull-up resistor is required - the internal circuitry interprets low voltage (<0.7 V) as shutdown command. During shutdown, the VCC bypass switch is also disabled regardless of VIN level, enhancing system-level power control.
SM72485MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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):
- 6V
- Voltage - Input (Max):
- 95V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 85V
- Current - Output:
- 150mA
- Frequency - Switching:
- 50kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
SM72485MMX/NOPB FAQ
1.How can I place an order for SM72485MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72485MMX/NOPB 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 SM72485MMX/NOPB reliable?
The price and inventory of SM72485MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72485MMX/NOPB is usually 5 days.
3.What payment methods are accepted for SM72485MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72485MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72485MMX/NOPB?
SM72485MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72485MMX/NOPB 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 SM72485MMX/NOPB?
For technical support, including SM72485MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72485MMX/NOPB requirements.
6.How does Aetrix verify that SM72485MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72485MMX/NOPB 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 SM72485MMX/NOPB meets industry standards.
7.What is the process for return or replacement of SM72485MMX/NOPB?
All SM72485MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72485MMX/NOPB, 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 SM72485MMX/NOPB part is unused and in its original packaging.
Return procedure for SM72485MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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