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Texas Instruments LM5008SD/NOPB
- Part No.:
- LM5008SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5008SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
LM5008SD/NOPB from Texas Instruments is a 95-V input, 350-mA constant on-time (COT) buck switching regulator with integrated 100-V N-channel MOSFET, internal 7-V VCC regulator, and programmable current limit. It delivers regulated DC output from 9.5–95 V input rails in telecom, automotive, and industrial power supplies, supporting up to 10 V at 300 mA with 2.5 V feedback reference and 300 ns minimum off-time.
For engineers reviewing the LM5008SD/NOPB datasheet, LM5008SD/NOPB pinout, LM5008SD/NOPB application, or LM5008SD/NOPB equivalent, key selection considerations include input voltage range (9.5–95 V), integrated high-voltage switch RDS(on) (1.15 Ω typ), thermal shutdown (165 °C), remote shutdown capability via RON/SD pin, and no-loop-compensation COT control architecture.
Technical Context
The LM5008SD/NOPB uses a hysteretic constant-on-time control scheme where on-time varies inversely with VIN (TON = 1.25×10⁻¹⁰ × RON/VIN), enabling near-constant switching frequency across line and load. Its internal regulation comparator compares FB to a precise 2.5 V reference, while an overvoltage comparator trips at 2.875 V to terminate on-time immediately.
Current limiting employs an intelligent off-timer with external RCL programming (35 µs max at FB = 0 V), and thermal protection includes automatic recovery hysteresis (165 °C trip, 140 °C reset). The device operates in discontinuous conduction mode (DCM) at light loads and continuous conduction mode (CCM) at heavier loads, with bootstrap gate drive requiring a 0.01 µF BST–SW capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports wide-range industrial, telecom, and 48-V automotive inputs without external pre-regulation |
| Output Current | 350 mA DC - sufficient for auxiliary rails, sensors, and low-power subsystems in high-voltage systems |
| Feedback Reference | 2.5 V ±55 mV - enables precise output voltage setting via resistor divider (VOUT = 2.5 × (R1 + R2)/R2) |
| Switch RDS(on) | 1.15 Ω (typ) at 25 °C - limits conduction loss and junction temperature rise under full load |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - protects against sustained overload or poor PCB thermal design |
| Minimum Off-Time | 300 ns - ensures reliable bootstrap capacitor recharge and stable operation at high VIN/VOUT ratios |
| VCC Regulator | 7 V ±0.4 V, 10 mA current-limited - powers internal gate driver and logic; can be externally biased to reduce dissipation |
Pinout & Package
LM5008SD/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 (RθJA = 42 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching output; connects to inductor, freewheeling diode, and BST capacitor - must minimize trace inductance |
| 2 BST | Bootstrap supply | Input to high-side gate driver; requires 0.01 µF ceramic cap to SW - enables N-MOSFET high-side drive |
| 3 RCL | Current limit off-time set | Resistor-to-RTN sets intelligent foldback delay (35 µs max); scales with FB voltage to reduce recovery time during partial overloads |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits - must tie directly to power ground plane |
| 5 FB | Feedback input | Inverting input of regulation comparator (2.5 V threshold); bias current ≤100 nA - demands high-impedance divider and low-ESR output cap |
| 6 RON/SD | On-time set / shutdown | Resistor-to-VIN sets TON; pulled low (<0.7 V) disables regulator - dual-function pin simplifies enable/control circuitry |
| 7 VCC | Internal bias rail | 7-V regulated output powering gate driver and logic; UVLO at 6.3 V - can be externally biased (8–14 V) to disable internal LDO |
| 8 VIN | Main input supply | High-voltage input (9.5–95 V); withstands 100-V transients - requires robust input filtering and layout isolation |
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, <2.56 µs at 2.3 V FB) - minimizes foldback and improves transient recovery |
| Ultra-fast transient response | On-time adjustment per cycle enables immediate reaction to load steps - maintains tight regulation without output capacitance overdesign |
| Integrated 100-V N-channel buck switch | RDS(on) = 1.15 Ω (25 °C) - eliminates external high-voltage MOSFET and associated gate drive complexity |
| Remote shutdown with hysteresis | RON/SD pin accepts 0.4–1.05 V rising threshold with 35 mV hysteresis - enables clean enable/disable sequencing in multi-rail systems |
Applications
| Telecom Power Conversion | Automotive Auxiliary Rail |
|---|---|
Use Scenario: Step-down conversion from 48-V telecom battery backup or PoE++ midspan to 5–12 V for baseband processors and interface ICs. 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 high-voltage MOSFET and compensation components - reduces solution size by >30% vs discrete controllers. | Use Scenario: Generating 3.3 V or 5 V from 12–48 V vehicle battery for ADAS camera modules, infotainment USB ports, or CAN transceivers. IC Role / Device Role / Timing Role: High-input-voltage buck converter with thermal shutdown and UVLO - ensures safe operation during cold-crank (6.5 V) and load-dump (100 V) events. Use Value: Withstands 95 V continuous and 100 V transients while delivering 350 mA - avoids derating or cascaded regulation stages. |
| Industrial Sensor Power | High-Voltage Post-Regulation |
Use Scenario: Powering isolated analog front-ends, pressure transducers, or RTD interfaces in 24–95 V industrial PLC backplanes or fieldbus nodes. IC Role / Device Role / Timing Role: Compact, low-quiescent-current (485 µA typ) buck regulator supplying stable bias to precision signal chains. Use Value: 2.5 V reference accuracy (±2.2%) and 100 nA FB bias current enable sub-0.1% output tolerance with standard resistors. | Use Scenario: Secondary regulation after a high-voltage AC/DC front-end (e.g., 380 V PFC output stepped to 48 V) to generate clean 10 V for FPGA I/O or ADC references. IC Role / Device Role / Timing Role: Efficient post-regulator operating in DCM at light loads - maintains >85% efficiency down to 1 mA output current. Use Value: 300 ns minimum off-time and bootstrap architecture ensure reliable startup and regulation even with high VIN/VOUT ratios (e.g., 95 V → 10 V). |
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 (3–100 V), higher current (500 mA), requires external MOSFETs - no integrated switch | Used where higher output current or adjustable frequency is needed; lacks single-chip simplicity | Select when >350 mA load or programmable frequency outweighs integration benefits |
| TPS54060DGQR | Narrower input (3.5–60 V), lower max VIN, integrated switch, but requires loop compensation - not COT | Suitable for 24–48 V systems only; slower transient response due to compensated voltage-mode control | Choose only if existing design uses TPS54x60 footprint and 60 V max input suffices |
Compared with LM5008SD/NOPB, LM5164PWPR offers higher current and input range but adds external FET complexity and board area, while TPS54060DGQR sacrifices high-voltage capability and transient performance for legacy compatibility - LM5008SD/NOPB remains optimal for compact, high-VIN, no-compensation designs.
Availability
LM5008SD/NOPB is available at Aetrix Electronics and suitable for telecom power conversion, automotive auxiliary rails, and industrial sensor power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LM5008SD/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5008SD/NOPB belongs to TI's high-voltage DC/DC buck regulator product line, designed specifically for cost-sensitive, space-constrained applications needing simple, robust step-down conversion from 9.5–95 V inputs without external compensation.
FAQ
What is the maximum input voltage rating for LM5008SD/NOPB?
The LM5008SD/NOPB has an absolute maximum input voltage rating of 100 V and a recommended operating range of 9.5 V to 95 V. Operation within this 9.5–95 V window ensures reliable performance with built-in protections including VCC undervoltage lockout, gate drive UVLO, and thermal shutdown. Exceeding 95 V continuously may accelerate aging; transient spikes up to 100 V are tolerated per JEDEC specifications.
Does LM5008SD/NOPB require external compensation components?
No, the LM5008SD/NOPB does not require external compensation components. Its constant-on-time (COT) hysteretic control architecture inherently stabilizes the feedback loop without resistors or capacitors in the compensation network. This eliminates tuning effort and component count, enabling rapid prototyping and consistent performance across input voltage and load variations - a key differentiator from voltage-mode or current-mode controllers like the TPS54060.
How is output voltage programmed on LM5008SD/NOPB?
Output voltage on the LM5008SD/NOPB is programmed using a resistor divider from VOUT to FB and FB to RTN. The internal 2.5 V reference sets the regulation point: VOUT = 2.5 × (R1 + R2)/R2, where R1 connects between VOUT and FB, and R2 connects between FB and RTN. FB bias current is only 100 nA, so standard 1% metal-film resistors yield high accuracy; for best stability, ensure ≥25 mV ripple at FB via output capacitor ESR or added series resistance (R3).
What is the purpose of the RCL pin on LM5008SD/NOPB?
The RCL pin on LM5008SD/NOPB sets the current-limit off-time duration using an external resistor to RTN. When the internal switch current exceeds 0.5 A, the present on-cycle terminates and the off-timer activates. Off-time ranges from 35 µs (at FB = 0 V, e.g., short-circuit) down to ~2.56 µs (at FB = 2.3 V), scaling inversely with FB voltage. This intelligent foldback reduces recovery time and power dissipation during partial overloads - a critical advantage over fixed-time or latch-off protection schemes.
Can LM5008SD/NOPB operate with an external VCC supply?
Yes, LM5008SD/NOPB can operate with an external VCC supply. Applying 8–14 V to the VCC pin disables the internal 7-V series regulator, reducing quiescent power dissipation - especially beneficial at high VIN (e.g., 95 V), where internal regulator losses would otherwise exceed 100 mW. The external supply must be well-bypassed with a 0.1 µF ceramic capacitor, and the internal VCC regulator automatically shuts down when external voltage exceeds its 7-V regulation setpoint.
LM5008SD/NOPB 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)
LM5008SD/NOPB FAQ
1.How can I place an order for LM5008SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008SD/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 LM5008SD/NOPB reliable?
The price and inventory of LM5008SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008SD/NOPB?
LM5008SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008SD/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 LM5008SD/NOPB?
For technical support, including LM5008SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008SD/NOPB requirements.
6.How does Aetrix verify that LM5008SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008SD/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 LM5008SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008SD/NOPB?
All LM5008SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008SD/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 LM5008SD/NOPB part is unused and in its original packaging.
Return procedure for LM5008SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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