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Texas Instruments LM5008SDC/NOPB
- Part No.:
- LM5008SDC/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5008SDC/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
LM5008SDC/NOPB from Texas Instruments is a 95-V input, 350-mA constant-on-time buck switching regulator with integrated 100-V N-channel MOSFET, internal 7-V VCC regulator, and 2.5-V precision feedback reference. It delivers regulated DC-DC conversion for high-voltage industrial power rails and operates across 9.5 V to 95 V input with no loop compensation required. Used in non-isolated telecommunication buck regulators and 48-V automotive post-regulation.
For engineers reviewing the LM5008SDC/NOPB datasheet, LM5008SDC/NOPB pinout, LM5008SDC/NOPB application, or LM5008SDC/NOPB equivalent, key selection criteria include input voltage range (9.5–95 V), current limit threshold (0.51 A typ), minimum off-time (300 ns), thermal shutdown (165 °C), and RON/SD pin programmable on-time control.
Technical Context
The LM5008SDC/NOPB implements a hysteretic constant-on-time (COT) control architecture where on-time varies inversely with VIN via external RON, enabling near-constant operating frequency across line and load variations. Its regulation relies on a 2.5-V internal reference compared against FB voltage, with overvoltage protection triggered at 2.875 V.
It integrates a bootstrap-gated N-channel buck switch, intelligent current-limit off-timer set by RCL and FB voltage, and a self-biased 7-V VCC regulator with UVLO (6.3 V) and 10 mA current limit. Discontinuous conduction mode (DCM) at light loads improves efficiency without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports wide-range industrial and telecom inputs including 48-V and 95-V rails. |
| Output Current | 350 mA DC - maximum continuous load current with integrated MOSFET and thermal management. |
| Feedback Reference | 2.5 V ±22 mV - precise internal reference sets output voltage via R1/R2 divider; enables accurate regulation. |
| Current Limit Threshold | 0.51 A (typ) - protects switch during overload; triggers intelligent off-timer dependent on RCL and FB voltage. |
| Minimum Off-Time | 300 ns - ensures reliable bootstrap capacitor recharge and stable operation at high VIN. |
| VCC Regulator Output | 7 V ±0.4 V - powers internal gate driver and logic; shuts down if externally biased above 7 V to reduce dissipation. |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - disables switch and VCC regulator until junction cools to ~140 °C. |
| Shutdown Current | 76 µA (typ) at 48 V - ultra-low quiescent draw in RON/SD-controlled disable mode. |
Pinout & Package
LM5008SDC/NOPB is packaged in an 8-pin WSON (NGU) package with 4.00 mm × 4.00 mm body size and exposed thermal pad (EP) connected to system ground for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching output tied to inductor, freewheeling diode, and BST capacitor; carries pulsed high-current paths. |
| 2 BST | Bootstrap supply | Input to floating gate driver; requires 0.01-µF ceramic cap between BST and SW for high-side drive. |
| 3 RCL | Current limit off-time set | Resistor-to-RTN sets intelligent off-time duration during current limit; defaults to 35 µs when FB = 0 V. |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits; must be low-impedance connection. |
| 5 FB | Feedback input | Inverting input of regulation comparator; compares output voltage (via resistor divider) to 2.5-V internal reference. |
| 6 RON/SD | On-time set / shutdown | Resistor-to-VIN sets on-time inversely proportional to VIN; pulled low (<0.7 V) to enter shutdown mode. |
| 7 VCC | Internal bias rail | 7-V regulated output powering gate driver and control logic; accepts auxiliary bias up to 14 V to disable internal regulator. |
| 8 VIN | Main input supply | High-voltage input (9.5–95 V); powers internal start-up regulator and provides energy for switching cycles. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic COT control eliminates external compensation components, reducing BOM count and design iteration time. |
| Integrated 100-V N-channel buck switch | Enables single-chip 95-V buck conversion without external high-voltage MOSFET or driver, simplifying layout and reliability. |
| Intelligent current limit protection | Off-time scales with FB voltage and RCL value-short-circuit yields 35 µs off-time; moderate overload reduces off-time to minimize foldback. |
| Ultra-fast transient response | Fixed on-time + hysteretic regulation achieves rapid recovery from load steps without phase-margin tuning. |
| Self-biased VCC regulator | 7-V series regulator powers internal circuitry; can be disabled using external 8–14 V bias to cut IC power loss at high VIN. |
| Discontinuous conduction mode (DCM) | Automatically enters DCM at light loads, reducing switching frequency and maintaining >80% efficiency down to 1 mA load. |
Applications
| Telecom Power Supply | Automotive Post-Regulator |
|---|---|
Use Scenario: Step-down conversion from 48-V telecom battery bus to 3.3 V or 5 V for base station control logic and interface ICs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, low-noise DC output with fast transient response to burst traffic loads. Use Value: Eliminates need for external high-voltage MOSFET and compensation network while sustaining >85% efficiency across full 48-V input range. | Use Scenario: Regulation of 48-V vehicle electrical system to 12 V or 5 V for infotainment, ADAS sensors, or gateway ECUs. IC Role / Device Role / Timing Role: High-input-voltage buck controller managing load transients during cold-crank or load-dump events. Use Value: Withstands 95-V transients and uses thermal shutdown + current limiting to survive automotive fault conditions without external protection. |
| Industrial Sensor Hub | Smart Grid Interface |
Use Scenario: Powering isolated sensor nodes from unregulated 24-V or 48-V fieldbus supplies in factory automation systems. IC Role / Device Role / Timing Role: Compact, efficient local DC-DC stage delivering 3.3 V to microcontrollers and analog front-ends. Use Value: 8-pin WSON package and minimal external parts (inductor, two caps, three resistors) enable space-constrained PCB designs. | Use Scenario: Converting 95-V DC distribution lines in smart metering or grid-edge electronics to 5 V for communication modules. IC Role / Device Role / Timing Role: High-reliability buck converter operating continuously under harsh ambient temperatures (−40°C to +125°C). Use Value: Junction temperature monitoring and automatic thermal recovery ensure uninterrupted operation during extended overloads. |
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 input range (3–100 V), higher IOUT (500 mA), but requires external MOSFET and loop compensation. | Better suited for higher-current or lower-VIN applications; lacks integrated switch for <9.5 V operation. | Select LM5164PWPR only when >350 mA output or sub-9.5 V start-up is required; adds complexity and board area. |
| MAX5033BASA+ | Similar 76-V max input and integrated switch, but fixed 5 V or adjustable output; lower IOUT (250 mA) and no RCL-based current limit tuning. | Targeted at simpler, cost-sensitive 5-V systems; lacks programmable off-time and thermal recovery behavior. | Choose MAX5033BASA+ for fixed 5-V outputs where 250 mA suffices and advanced protection features are unnecessary. |
Compared with LM5008SDC/NOPB, LM5164PWPR offers higher current and broader VIN but increases design complexity, while MAX5033BASA+ simplifies implementation at the expense of flexibility and protection granularity-LM5008SDC/NOPB balances integration, programmability, and ruggedness for 9.5–95 V industrial buck needs.
Availability
LM5008SDC/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, automotive post-regulators, industrial sensor hubs, and smart grid interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5008SDC/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 ICs, with leadership in high-reliability industrial and automotive solutions.
The LM5008 product line delivers compact, high-input-voltage buck regulators for applications demanding robustness, simplicity, and minimal external components-designed specifically for 48-V, 95-V, and telecom infrastructure power conversion.
FAQ
What is the absolute maximum input voltage rating for LM5008SDC/NOPB?
The absolute maximum input voltage for LM5008SDC/NOPB is 100 V, as specified in the Absolute Maximum Ratings table. However, recommended operating conditions limit continuous input to 95 V. Transient exposure up to 100 V is permissible per JEDEC stress guidelines, but sustained operation above 95 V may impact reliability and thermal performance. Always verify layout and external component ratings-including the inductor saturation current and output capacitor voltage-for safe operation at high VIN.
How does the LM5008SDC/NOPB achieve constant frequency operation despite varying input voltage?
The LM5008SDC/NOPB uses a constant-on-time (COT) control scheme where on-time is inversely proportional to VIN via the RON resistor. As VIN increases, on-time decreases proportionally, keeping the average switching period-and thus frequency-relatively stable across line and load changes. This eliminates the need for traditional voltage-mode compensation while maintaining fast transient response. The minimum off-time of 300 ns further stabilizes timing at high VIN.
Can LM5008SDC/NOPB operate with an output voltage below 3.3 V?
Yes, LM5008SDC/NOPB supports adjustable output voltages down to approximately 2.5 V using the FB pin and external resistor divider, since its internal reference is 2.5 V. For outputs near or below 2.5 V, the divider must be configured so that FB remains at exactly 2.5 V under regulation. However, practical minimum output is constrained by component tolerances, FB bias current (100 nA), and ripple requirements-designs targeting ≤3.3 V should verify stability with low-ESR capacitors and consider adding R3 for controlled ripple per Figure 7 in the datasheet.
What is the purpose of the RCL pin on LM5008SDC/NOPB, and how is it configured?
The RCL pin on LM5008SDC/NOPB sets the off-time duration during current-limit events using an external resistor to RTN. Off-time is calculated as Toff = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL)). When FB = 0 V (e.g., short-circuit), off-time defaults to 35 µs. At higher FB voltages (e.g., partial overload), off-time shortens-reducing foldback and improving recovery. A typical RCL value is 100 kΩ, yielding ~2.56 µs off-time at FB = 2.3 V. This intelligent scaling prevents excessive current during faults while maintaining responsiveness.
Does LM5008SDC/NOPB require a minimum load to maintain regulation?
Yes, LM5008SDC/NOPB requires a minimum load current of 1 mA to sustain proper bootstrap capacitor charging and avoid erratic startup or cycling. Below this threshold, long off-times may discharge the BST capacitor, causing gate drive failure and intermittent operation. To meet this requirement in light-load applications, select feedback resistors (R1/R2) with sufficiently low values-e.g., R2 = 1 kΩ and R1 = 3.01 kΩ for 10 V output draws ~10 mA at VOUT, ensuring stable regulation even at near-zero load.
LM5008SDC/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)
LM5008SDC/NOPB FAQ
1.How can I place an order for LM5008SDC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008SDC/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 LM5008SDC/NOPB reliable?
The price and inventory of LM5008SDC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008SDC/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008SDC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008SDC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008SDC/NOPB?
LM5008SDC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008SDC/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 LM5008SDC/NOPB?
For technical support, including LM5008SDC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008SDC/NOPB requirements.
6.How does Aetrix verify that LM5008SDC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008SDC/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 LM5008SDC/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008SDC/NOPB?
All LM5008SDC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008SDC/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 LM5008SDC/NOPB part is unused and in its original packaging.
Return procedure for LM5008SDC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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