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Texas Instruments LM5008SDCX/NOPB
- Part No.:
- LM5008SDCX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5008SDCX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5008SDCX/NOPB from Texas Instruments is a 95-V input, 350-mA constant-on-time buck switching regulator with integrated 100-V N-channel MOSFET, 7-V internal VCC regulator, and 2.5-V precision feedback reference. It delivers regulated DC/DC conversion for high-voltage industrial and telecom rails, supporting 9.5–95 V input and adjustable output voltage via external resistors.
For engineers reviewing the LM5008SDCX/NOPB datasheet, LM5008SDCX/NOPB pinout, LM5008SDCX/NOPB application, or LM5008SDCX/NOPB equivalent, key selection considerations include its no-compensation hysteretic control, intelligent current-limit off-timer (35 µs max), 300 ns minimum off-time, thermal shutdown at 165°C, and dual-package availability in VSSOP-8 and WSON-8.
Technical Context
The LM5008SDCX/NOPB uses a constant-on-time (COT) hysteretic control architecture where on-time varies inversely with VIN (TON = 1.25×10⁻¹⁰ × RON / VIN), enabling near-constant operating frequency across line and load variations. Its regulation relies on comparison of FB voltage to a 2.5-V internal reference, with overvoltage protection triggered at 2.875 V.
It integrates a self-biased 7-V series regulator for gate drive, supports discontinuous conduction mode (DCM) at light loads for efficiency retention, and implements intelligent current limiting with FB-dependent off-time (Toff = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL))). Thermal shutdown activates at 165°C with 25°C hysteresis and automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports wide-range unregulated rails including 48-V telecom and industrial systems. |
| Output Current | 350 mA DC - maximum continuous load current under thermal limits in WSON package. |
| Feedback Reference | 2.5 V ±1.1% - sets output voltage via resistor divider (VOUT = 2.5 × (R1 + R2)/R2); low 100 nA bias current minimizes divider error. |
| Current Limit Threshold | 0.51 A (typ) - triggers immediate switch turn-off and programmable off-time for short-circuit and overload protection. |
| Minimum Off-Time | 300 ns - ensures bootstrap capacitor recharge and enables stable operation at high VIN and low VOUT. |
| VCC Regulator Output | 7 V (±0.4 V) - powers internal gate driver and logic; shuts down when externally biased ≥8 V to reduce dissipation. |
| Thermal Shutdown | 165°C activation with 25°C hysteresis - forces reset state and automatic recovery at ~140°C junction temperature. |
Pinout & Package
LM5008SDCX/NOPB is supplied in an 8-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad (EP), optimized for high-voltage, space-constrained applications. The EP is electrically isolated and must be connected to system ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching output connected to inductor, bootstrap capacitor (C4), and freewheeling diode cathode. |
| 2 BST | Bootstrap supply input | Accepts charge from VCC via internal diode during off-time; requires 0.01-µF ceramic cap to SW for gate drive. |
| 3 RCL | Current limit off-time set | Resistor-to-RTN sets intelligent off-time duration (35 µs max at FB = 0 V); enables fast short-circuit response. |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits; separate from power ground path. |
| 5 FB | Feedback input | Connects to resistor divider; compared to 2.5-V reference for regulation; 2.875-V OV comparator disables switch. |
| 6 RON/SD | On-time set / shutdown control | Resistor-to-VIN sets on-time; pulled low (<0.7 V) enables remote shutdown with 76 µA quiescent current. |
| 7 VCC | Internal regulator output | 7-V, 10-mA current-limited supply for gate driver and logic; UVLO at 6.3 V prevents startup until stable. |
| 8 VIN | Main input supply | Accepts 9.5–95 V DC; withstands 100-V transients; powers internal HV start-up regulator and switch drain. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic COT control eliminates external compensation components, reducing BOM count and design iteration time. |
| Intelligent current limit protection | Off-time scales inversely with FB voltage - 35 µs at short-circuit, shorter during mild overload - minimizing foldback and improving recovery. |
| Ultra-fast transient response | Fixed on-time + hysteretic regulation enables immediate switch re-triggering when FB falls below 2.5 V, critical for burst-load applications. |
| Self-biased VCC option | External 8–14 V applied to VCC disables internal HV regulator, cutting IC power dissipation in high-VIN designs. |
| Thermal shutdown with auto-recovery | 165°C trip with 25°C hysteresis ensures safe operation and resumption without manual reset after cooling. |
Applications
| Industrial 48-V Power Distribution | Telecom Secondary Post-Regulation |
|---|---|
Use Scenario: Converting 48-V backplane rail to 3.3 V or 5 V for FPGA I/O, microcontroller cores, or sensor interfaces in factory automation controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing tightly regulated, low-noise DC supply with fast load-step response. Use Value: Eliminates need for external compensation and reduces solution size by integrating 100-V switch and 7-V bias regulator. |
Use Scenario: Stepping down 48-V telecom shelf voltage to 12 V for optical module drivers or line-card auxiliary supplies. IC Role / Device Role / Timing Role: High-input-voltage post-regulator delivering stable output despite input ripple and load transients typical in distributed power systems. Use Value: 95-V rating and 300 ns minimum off-time ensure reliable operation during 100-V surge events and high-frequency switching. |
| Automotive 24-V/48-V Systems | High-Voltage IoT Edge Node Supply |
Use Scenario: Powering infotainment subsystems or ADAS sensors from 24-V battery or emerging 48-V mild-hybrid architectures. IC Role / Device Role / Timing Role: Robust buck converter handling cold-crank (≥6 V) and load-dump (≥95 V) conditions while maintaining regulation. Use Value: Integrated UVLO (6.3 V) and overvoltage protection (2.875 V at FB) prevent malfunction during automotive transients. |
Use Scenario: Generating 5 V or 3.3 V from 24–72 V PoE++ or solar-powered edge gateways with minimal external components. IC Role / Device Role / Timing Role: Compact, high-efficiency DC/DC stage enabling long-life battery or energy-harvesting operation. Use Value: DCM operation at light loads and <485 µA quiescent current extend runtime in always-on sensing applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164PWPR | Wider 4.5–100 V input range; 500 mA output; requires external compensation; 2.5-V reference same. | Supports lower VIN (4.5 V) but lacks integrated VCC regulator - needs auxiliary bias or bootstrap management. | Preferred for sub-9.5 V start-up or higher current; less suitable for ultra-simple, no-compensation designs. |
| MAX17504ATP+ | 4.5–60 V input; 400 mA; current-mode control; 0.8-V reference; requires full compensation network. | Lower max VIN limits use in 95-V telecom or industrial rails; higher accuracy 0.8-V ref enables tighter low-VOUT regulation. | Chosen when precise low-voltage outputs or EMI-controlled fixed-frequency operation are prioritized over simplicity. |
Compared with LM5008SDCX/NOPB, LM5164PWPR offers higher current and lower VIN capability but adds design complexity, while MAX17504ATP+ provides superior low-VOUT accuracy and EMI control at the cost of full loop compensation and reduced high-voltage tolerance.
Availability
LM5008SDCX/NOPB is available at Aetrix Electronics and suitable for industrial 48-V power distribution, telecom secondary post-regulation, and automotive 24-V/48-V systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5008SDCX/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5008SDCX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for simple, robust, and compact DC/DC conversion in 9.5–95 V input environments such as telecom, industrial, and automotive systems.
FAQ
What is the absolute maximum input voltage rating for the LM5008SDCX/NOPB?
The LM5008SDCX/NOPB has an absolute maximum VIN rating of 100 V, with recommended operating range from 9.5 V to 95 V. This 100-V rating allows safe operation during transient surges common in industrial and telecom power rails. Exceeding 100 V may cause permanent damage, and the device incorporates internal protection features including VCC undervoltage lockout and thermal shutdown to enhance reliability within its specified range. Always observe derating guidelines per the datasheet.
Does the LM5008SDCX/NOPB require external compensation components?
No, the LM5008SDCX/NOPB does not require external compensation components due to its constant-on-time (COT) hysteretic control architecture. Regulation is achieved by comparing the FB pin voltage to a 2.5-V internal reference and triggering fixed on-times inversely proportional to VIN. This eliminates the need for loop compensation networks, reducing bill-of-materials count and simplifying layout. The absence of compensation also contributes to ultra-fast transient response and inherent stability across line and load variations.
How does the current limit protection work in the LM5008SDCX/NOPB?
The LM5008SDCX/NOPB implements intelligent current limit protection that terminates the current switching cycle immediately upon detecting >0.51 A (typ) through the internal N-channel MOSFET. It then initiates a programmable off-time controlled by the RCL pin and FB voltage - 35 µs at short-circuit (FB = 0 V), decreasing as FB rises. This adaptive off-time minimizes foldback during mild overloads, improves recovery speed, and ensures safe operation up to 95 V input. The current sense circuit is blanked for 50–70 ns at turn-on to avoid false triggering.
Can the LM5008SDCX/NOPB be used with an external bias supply on the VCC pin?
Yes, the LM5008SDCX/NOPB supports external bias on the VCC pin. Applying 8–14 V to VCC disables the internal 7-V series regulator, reducing power dissipation in high-VIN applications. This feature is especially valuable when VIN exceeds 60 V, where internal regulator losses would otherwise increase significantly. The external supply must be well-decoupled with a 0.1-µF ceramic capacitor, and VCC must never exceed 14 V to prevent damage. When biased externally, the internal regulator remains inactive but continues to provide gate drive power via the BST-SW bootstrap path.
What is the purpose of the RON/SD pin on the LM5008SDCX/NOPB?
The RON/SD pin on the LM5008SDCX/NOPB serves a dual function: it sets the switch on-time via an external resistor to VIN (TON = 1.25×10⁻¹⁰ × RON / VIN), and enables remote shutdown when pulled below 0.7 V. In shutdown mode, both the internal VCC regulator and buck switch disable, reducing quiescent current to 76 µA (typ). This pin allows flexible timing control and system-level power sequencing without additional logic. The pin voltage naturally sits between 1.5–3 V during normal operation depending on VIN and RON value, ensuring robust noise immunity.
LM5008SDCX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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):
- 9.5V
- Voltage - Input (Max):
- 95V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 75V
- Current - Output:
- 350mA
- Frequency - Switching:
- 50kHz ~ 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM5008SDCX/NOPB FAQ
1.How can I place an order for LM5008SDCX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008SDCX/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 LM5008SDCX/NOPB reliable?
The price and inventory of LM5008SDCX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008SDCX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008SDCX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008SDCX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008SDCX/NOPB?
LM5008SDCX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008SDCX/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 LM5008SDCX/NOPB?
For technical support, including LM5008SDCX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008SDCX/NOPB requirements.
6.How does Aetrix verify that LM5008SDCX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008SDCX/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 LM5008SDCX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008SDCX/NOPB?
All LM5008SDCX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008SDCX/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 LM5008SDCX/NOPB part is unused and in its original packaging.
Return procedure for LM5008SDCX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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