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Texas Instruments LM5008SDC
- Part No.:
- LM5008SDC
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5008SDC.pdf
- Description:
- IC REG BUCK ADJ 350MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
LM5008SDC from Texas Instruments is a 95-V, 350-mA constant on-time (COT) buck switching regulator with integrated 100-V N-channel MOSFET, internal 7-V VCC series regulator, and programmable current limit. It operates from 9.5 V to 95 V input, delivers regulated output down to 2.5 V via resistive feedback, and supports discontinuous/continuous conduction modes for high efficiency across load range - used in 48-V automotive post-regulation and telecom power supplies.
For engineers reviewing the LM5008SDC datasheet, LM5008SDC pinout, LM5008SDC application, or LM5008SDC equivalent, key selection criteria include its VIN range (9.5–95 V), 0.51-A current limit threshold, 2.5-V FB reference, 300-ns minimum off-time, and thermal shutdown at 165°C - all critical for high-voltage industrial and transportation power designs.
Technical Context
The LM5008SDC implements a hysteretic constant-on-time control architecture where on-time varies inversely with VIN (TON = 1.25×10⁻¹⁰ × RON / VIN), enabling near-constant switching 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.
Current limiting uses an intelligent off-timer whose duration depends on both external RCL resistor and FB voltage (TOFF = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL))), providing graded response from short-circuit (35 µs) to mild overload. The device integrates a bootstrap gate driver with 0.01-µF BST–SW capacitor and requires an external ultrafast/Schottky recirculating diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports direct connection to unregulated 48-V telecom or industrial rails without pre-regulator |
| Output Current | 350 mA DC - sufficient for auxiliary bias rails, sensor interfaces, and low-power microcontrollers |
| Feedback Reference | 2.5 V ±55 mV - sets precise output voltage via R1/R2 divider; enables 3.3 V, 5 V, or custom outputs |
| Current Limit Threshold | 0.51 A (typ) - protects switch during overload while allowing peak inrush for capacitive loads |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables switch and VCC regulator until junction cools to ~140°C |
| Minimum Off-Time | 300 ns - ensures reliable bootstrap capacitor recharge and stable operation at high VIN |
| VCC Regulator | 7 V ±0.4 V, 10 mA current-limited - powers internal gate driver and logic; accepts auxiliary 8–14 V input to reduce dissipation |
Pinout & Package
LM5008SDC is available in an 8-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad (EP), optimized for high-voltage layout and thermal performance. Pin numbering follows standard top-view orientation with EP electrically isolated and recommended for PCB ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connects to inductor, recirculating diode cathode, and BST capacitor - carries high dv/dt and pulsed current |
| 2 BST | Bootstrap supply | Accepts 0.01-µF ceramic cap between BST and SW; internal diode charges it from VCC during off-time |
| 3 RCL | Current limit off-time set | Resistor to RTN programs off-duration after current limit trip - longer off-time for lower FB voltage (e.g., short circuit) |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits - must tie to low-impedance system ground |
| 5 FB | Feedback input | Inverting input of regulation comparator; 100 nA bias current - connects to resistor divider from VOUT |
| 6 RON/SD | On-time set / shutdown | Resistor to VIN sets on-time; pulled low (<0.7 V) forces shutdown with 76 µA quiescent current |
| 7 VCC | Internal bias rail | 7-V regulated output powering gate driver; UVLO at 6.3 V; max 14 V if externally biased |
| 8 VIN | Main input | High-voltage input (9.5–95 V); withstands 100-V transients - requires local 0.1-µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic COT control eliminates external compensation network - reduces BOM count and design iteration time |
| Intelligent current limit protection | Off-time scales with FB voltage: 35 µs at short circuit (FB ≈ 0 V), shorter for partial overloads - minimizes foldback and improves recovery |
| Ultra-fast transient response | Fixed on-time + no compensation yields immediate reaction to load steps - maintains tight regulation under dynamic loads |
| Integrated 100-V N-channel buck switch | RDS(on) = 1.15 Ω (typ) at 25°C - eliminates external MOSFET, simplifies layout, and reduces solution size |
| Self-biased VCC option | VCC pin accepts 8–14 V auxiliary supply to disable internal HV regulator - cuts IC power loss in high-VIN applications |
Applications
| Industrial 48-V Rail Regulation | Automotive Body Control Module Supply |
|---|---|
Use Scenario: Converting unregulated 48-V battery or bus to 3.3 V/5 V for MCU, CAN transceivers, and sensors in harsh environments. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable low-voltage rail with high input transient tolerance. Use Value: 95-V absolute max rating and 165°C thermal shutdown ensure robustness against load dump and under-hood temperature extremes. | Use Scenario: Powering infotainment subsystems and lighting controllers from vehicle's 48-V mild-hybrid architecture. IC Role / Device Role / Timing Role: High-efficiency post-regulator stepping down 48-V to 12 V or 5 V with minimal external components. Use Value: Discontinuous conduction mode at light loads maintains >85% efficiency down to 1 mA, extending standby battery life. |
| Telecom Secondary Power Supply | Industrial IoT Sensor Node Power |
Use Scenario: Generating isolated or non-isolated 5-V/3.3-V bias from -48-V telecom rectified bus using discrete isolation stage. IC Role / Device Role / Timing Role: Buck converter following front-end isolation - handles wide input variation and fast line transients. Use Value: Constant-frequency behavior across 9.5–95 V input avoids EMI band shifting; 2.5-V FB reference enables accurate remote sensing. | Use Scenario: Providing regulated 3.3 V for LPWAN radios (LoRa, NB-IoT) and environmental sensors in remote monitoring equipment. IC Role / Device Role / Timing Role: Primary DC/DC converter operating from long-life primary batteries or energy harvesters with wide voltage range. Use Value: 485 µA typical operating current and 76 µA shutdown current maximize battery service life; small WSON package saves board space. |
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 VIN range (4.5–100 V), higher IOUT (500 mA), synchronous rectification, adjustable frequency | Requires external MOSFETs; better suited for high-efficiency, high-current designs needing tighter ripple control | Select LM5164PWPR when >350 mA output or synchronous operation is required; LM5008SDC remains optimal for cost-sensitive, low-component-count 350-mA applications |
| MAX5033BASA+ | Lower VIN range (7.5–76 V), 600-mA output, fixed 500-kHz frequency, no RCL programmability | Lacks intelligent current limit off-timer and VCC self-bias capability; simpler but less flexible fault handling | Choose MAX5033BASA+ for fixed-frequency, plug-and-play designs where thermal foldback behavior is not critical |
Compared with LM5008SDC, LM5164PWPR offers higher current and synchronous efficiency but increases complexity and BOM count, while MAX5033BASA+ trades programmability and adaptive protection for simplicity and fixed timing - making LM5008SDC the balanced choice for rugged, medium-current, high-input-voltage buck conversion.
Availability
LM5008SDC is available at Aetrix Electronics and suitable for industrial 48-V rail regulation, automotive body control modules, and telecom secondary power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5008SDC 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM5008SDC belongs to TI's high-voltage DC/DC converter product line, designed specifically for efficient, compact, and robust step-down regulation from unregulated or semi-regulated 12-V to 95-V input sources in space-constrained and thermally demanding applications.
FAQ
What is the maximum input voltage rating for the LM5008SDC?
The LM5008SDC has an absolute maximum input voltage rating of 100 V, with recommended operating range from 9.5 V to 95 V. This allows direct connection to 48-V telecom systems and industrial rails while surviving common transients. Exceeding 100 V risks permanent damage per Absolute Maximum Ratings table in the datasheet. The LM5008SDC internal 100-V N-channel switch and robust gate driver support this extended range without external protection components.
How does the LM5008SDC achieve constant switching frequency across varying input voltage?
The LM5008SDC achieves near-constant frequency through its constant-on-time (COT) control architecture: on-time is inversely proportional to VIN (TON = 1.25×10⁻¹⁰ × RON / VIN). As VIN increases, on-time decreases proportionally, maintaining consistent average switching period. This eliminates need for loop compensation and provides ultra-fast transient response. The LM5008SDC also enforces a 300-ns minimum off-time to ensure reliable bootstrap capacitor recharge, further stabilizing timing at high VIN.
Can the LM5008SDC be used without an external bootstrap capacitor?
No, the LM5008SDC requires an external 0.01-µF ceramic capacitor between BST and SW pins. This capacitor supplies gate drive voltage to the internal N-channel MOSFET during the on-time. During off-time, the internal diode recharges it from VCC. Omitting this capacitor prevents proper high-side gate drive, causing switch failure or erratic operation. The LM5008SDC datasheet explicitly specifies this component in Pin Functions and Typical Application Circuit - no internal bootstrap capacitance is integrated.
What is the purpose of the RCL pin on the LM5008SDC, and how is it configured?
The RCL pin on the LM5008SDC sets the off-time duration after current limit activation. A resistor from RCL to RTN programs TOFF = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL)), yielding longer off-times for lower FB voltages (e.g., 35 µs at FB = 0 V during short circuit). This intelligent timing prevents destructive current foldback while enabling faster recovery under partial overloads. The LM5008SDC datasheet provides design equations and curves (Figure 4) to select RCL based on desired fault-handling behavior.
Does the LM5008SDC support remote shutdown, and what voltage level triggers it?
Yes, the LM5008SDC supports remote shutdown via the RON/SD pin. Pulling this pin below 0.7 V (typical, with 35-mV hysteresis) forces the device into shutdown mode, reducing quiescent current to 76 µA (typ) at VIN = 48 V. In shutdown, both the internal VCC regulator and buck switch are disabled. The LM5008SDC also features VCC undervoltage lockout (6.3 V threshold) as a secondary enable/disable mechanism - ensuring safe start-up and brownout protection independent of RON/SD control.
LM5008SDC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM5008SDC through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008SDC 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 reliable?
The price and inventory of LM5008SDC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008SDC is usually 5 days.
3.What payment methods are accepted for LM5008SDC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008SDC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008SDC?
LM5008SDC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008SDC 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?
For technical support, including LM5008SDC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008SDC requirements.
6.How does Aetrix verify that LM5008SDC is sourced from the original manufacturer or authorized distributors?
All LM5008SDC 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 meets industry standards.
7.What is the process for return or replacement of LM5008SDC?
All LM5008SDC units undergo pre-shipment inspection (PSI). If there is an issue with LM5008SDC, 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 part is unused and in its original packaging.
Return procedure for LM5008SDC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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