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Texas Instruments LM5008MMX/NOPB
- Part No.:
- LM5008MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5008MMX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,236
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Product details
Overview
LM5008MMX/NOPB 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 no-loop-compensation architecture. It delivers regulated DC output from 9.5–95 V input in compact VSSOP-8 packaging, supporting automotive 48-V systems, telecom secondary regulators, and industrial high-voltage post-regulation.
For engineers reviewing the LM5008MMX/NOPB datasheet, LM5008MMX/NOPB pinout, LM5008MMX/NOPB application, or LM5008MMX/NOPB equivalent, key selection criteria include its 0.51-A current limit threshold, 2.5-V FB reference, 300-ns minimum off-time, adjustable on-time via RON resistor, and thermal shutdown at 165°C - all critical for high-input-voltage buck design validation and reliability assurance.
Technical Context
The LM5008MMX/NOPB implements 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 9.5–95 V input and load variations. Its discontinuous conduction mode (DCM) operation at light loads maintains efficiency by reducing switching losses.
Regulation relies on a 2.5-V internal reference comparator monitoring FB voltage, while an independent 2.875-V overvoltage comparator terminates on-time immediately if FB exceeds threshold. Current limiting uses an intelligent off-timer (TOFF = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL))) set by RCL and FB, providing graded foldback during overload versus hard short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports wide-range industrial/automotive rails including 48-V systems and telecom -48-V derived supplies. |
| Output Current | 350 mA DC - maximum continuous load capability with integrated 100-V N-MOSFET and thermal derating up to 125°C junction. |
| Feedback Reference | 2.5 V ±55 mV - precise internal reference enabling accurate output regulation via external resistor divider (VOUT = 2.5 × (R1+R2)/R2). |
| Current Limit Threshold | 0.51 A (typ) at 25°C - protects switch during overload; triggers intelligent off-timer with FB-dependent duration (35 µs at FB=0 V). |
| Minimum Off-Time | 300 ns - ensures bootstrap capacitor recharge between cycles and enables stable operation at high VIN and low VOUT. |
| VCC Regulator Output | 7 V ±0.4 V - powers gate driver and internal circuitry; shuts down when 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, preventing catastrophic failure. |
Pinout & Package
LM5008MMX/NOPB is supplied in an 8-pin VSSOP package (3.00 mm × 3.00 mm) with exposed pad not electrically connected; thermal performance optimized via PCB ground plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching node connecting to inductor, recirculating diode, and bootstrap capacitor; carries pulsed high-current path. |
| 2 BST | Bootstrap supply | Input to floating gate driver; requires 0.01-µF ceramic cap to SW for high-side N-MOSFET drive during on-time. |
| 3 RCL | Current limit off-time set | Resistor-to-ground sets intelligent off-time duration during current limit; formula TOFF = 10⁻⁵/(0.285 + (FB/6.35×10⁻⁶×RCL)). |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits; must be low-impedance connection to minimize noise coupling. |
| 5 FB | Feedback input | Inverting input of regulation comparator; compares output voltage (via resistor divider) against 2.5-V reference for closed-loop control. |
| 6 RON/SD | On-time set / shutdown | Resistor-to-VIN sets on-time (TON ∝ RON/VIN); pulled low (<0.7 V) forces shutdown with 76-µA quiescent current. |
| 7 VCC | Internal bias rail | 7-V regulated output powering gate driver and logic; current-limited to 9.5 mA; internal diode connects to BST for bootstrap charging. |
| 8 VIN | Main input supply | High-voltage input (9.5–95 V); powers internal start-up regulator and switch; absolute max rating 100 V transient. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic COT control eliminates external compensation network, reducing BOM count and design iteration time. |
| Adjustable on-time via RON | Enables frequency tuning across input range (e.g., 300 ns min at 95 V, 2.77 µs typ at 10 V) while maintaining stability. |
| Intelligent current limit protection | Off-time scales with FB voltage - 35 µs during short-circuit (FB ≈ 0 V), shorter during moderate overload - minimizing foldback and recovery delay. |
| Integrated 100-V N-channel buck switch | Eliminates external high-voltage MOSFET, simplifying layout and improving reliability in 48-V/95-V applications. |
| Ultra-fast transient response | Direct FB sensing and fixed on-time enable immediate reaction to load steps without phase-margin concerns. |
Applications
| Telecom Secondary Regulator | Automotive 48-V Post-Regulator |
|---|---|
Use Scenario: Converts -48-V telecom supply to isolated 12-V or 5-V intermediate bus for digital signal processors and interface ICs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable output under variable line conditions and burst-mode traffic loads. Use Value: 95-V input rating handles telecom transients; 350-mA output supports multi-rail distribution; DCM operation improves standby efficiency during low-traffic periods. | Use Scenario: Steps down 48-V battery rail to 3.3-V or 5-V for ADAS sensors, infotainment microcontrollers, and CAN transceivers. IC Role / Device Role / Timing Role: High-reliability buck converter operating in harsh automotive environments with wide temperature (-40°C to 125°C) and input variation. Use Value: Integrated 100-V switch withstands load-dump transients; thermal shutdown (165°C) and UVLO protect against engine-off battery drain and cold-cranking undervoltage. |
| Industrial High-Voltage Post-Regulator | Smart Grid Power Supply |
Use Scenario: Regulates unregulated 24–95-V DC from rectified AC or PoE++ sources to 3.3-V for microcontroller and communication modules. IC Role / Device Role / Timing Role: Compact, self-contained buck controller enabling space-constrained designs in DIN-rail mounted equipment and PLC I/O modules. Use Value: VSSOP-8 footprint minimizes board area; 7-V VCC regulator allows auxiliary biasing to reduce power loss; RCL-adjustable current limit supports diverse load profiles. | Use Scenario: Powers metering ICs and RF modems in smart electricity meters using utility-supplied 24–95-V DC backup rails. IC Role / Device Role / Timing Role: Primary DC/DC stage ensuring uninterrupted operation during grid fluctuations and brownouts. Use Value: 9.5-V UVLO prevents startup at unsafe voltages; 2.5-V FB reference enables precise 3.3-V output tolerance; low 485-µA operating current extends battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDPRRQ1 | Automotive-grade (AEC-Q100), 100-V input, 500-mA output, current-mode control requiring compensation. | Requires external loop compensation; higher output current but larger solution size due to added components. | Choose for automotive safety-critical systems needing AEC-Q100 qualification and higher load capability. |
| MAX17690ATP+ | 65-V input, 400-mA output, constant-on-time control, integrated high-side FET, but no VCC regulator. | Lacks internal VCC LDO - requires external bias or bootstrap management; narrower input range limits use in 95-V telecom. | Prefer for cost-sensitive industrial applications below 65 V where external bias is available and layout simplicity is secondary. |
Compared with LM5008MMX/NOPB, LM5164QDPRRQ1 offers automotive qualification and higher current but adds compensation complexity, while MAX17690ATP+ provides similar COT simplicity but sacrifices 95-V capability and integrated VCC regulation - making LM5008MMX/NOPB optimal for non-automotive 95-V applications demanding minimal external parts and self-biased operation.
Availability
LM5008MMX/NOPB is available at Aetrix Electronics and suitable for telecom secondary regulators, automotive 48-V post-regulators, and industrial high-voltage power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5008MMX/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, serving industrial, automotive, and communications markets with high-reliability components.
The LM5008MMX/NOPB belongs to TI's high-voltage DC/DC converter product line, designed specifically for step-down regulation from 9.5–95 V inputs in space-constrained, high-efficiency applications where simplicity and robustness are critical.
FAQ
What is the maximum input voltage rating for the LM5008MMX/NOPB?
The LM5008MMX/NOPB has an absolute maximum input voltage rating of 100 V, with recommended operating range from 9.5 V to 95 V. This 95-V upper limit ensures reliable operation under sustained high-line conditions and accommodates common telecom and industrial supply rails, while the 100-V transient rating handles short-duration surges such as load dump or lightning-induced spikes without damage.
Does the LM5008MMX/NOPB require external compensation components?
No, the LM5008MMX/NOPB does not require external compensation components. Its constant-on-time (COT) hysteretic control architecture eliminates the need for loop compensation networks, reducing bill-of-materials count and simplifying design. Regulation is achieved through direct comparison of FB voltage to the internal 2.5-V reference, with on-time dynamically adjusted per cycle based on VIN and RON - enabling stable operation across input and load variations without stability analysis.
How is the output voltage set on the LM5008MMX/NOPB?
The output voltage of the LM5008MMX/NOPB is set using an external resistor divider connected to the FB pin. The internal 2.5-V reference is compared to the divided output voltage, so VOUT = 2.5 × (R1 + R2) / R2, where R1 connects from VOUT to FB and R2 connects from FB to ground. This configuration allows precise adjustment of output voltage across the full operating range while maintaining regulation accuracy within ±2.2% over temperature and line variations.
What is the purpose of the RCL pin on the LM5008MMX/NOPB?
The RCL pin on the LM5008MMX/NOPB sets the off-time duration during current-limit events using an external resistor to ground. When the internal 0.51-A current limit is exceeded, the switch turns off and initiates a non-resettable off-timer whose duration depends on both RCL value and FB voltage: TOFF = 10⁻⁵ / (0.285 + (FB / 6.35×10⁻⁶ × RCL)). At FB = 0 V (e.g., output short), TOFF defaults to 35 µs; at higher FB, TOFF decreases, enabling faster recovery from moderate overloads while preserving protection during hard shorts.
Can the LM5008MMX/NOPB operate with zero load current?
No, the LM5008MMX/NOPB requires a minimum load current of 1 mA to maintain proper operation. Below this threshold, the bootstrap capacitor may discharge during extended off-times, causing gate drive failure and erratic switching or shutdown. If the application expects sub-mA loads, the feedback resistor divider must be sized to draw ≥1 mA at nominal VOUT - for example, using R1+R2 ≤ VOUT / 1 mA - ensuring continuous bootstrap recharge and stable regulation.
LM5008MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 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-VSSOP
LM5008MMX/NOPB FAQ
1.How can I place an order for LM5008MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008MMX/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 LM5008MMX/NOPB reliable?
The price and inventory of LM5008MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008MMX/NOPB?
LM5008MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008MMX/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 LM5008MMX/NOPB?
For technical support, including LM5008MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008MMX/NOPB requirements.
6.How does Aetrix verify that LM5008MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008MMX/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 LM5008MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008MMX/NOPB?
All LM5008MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008MMX/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 LM5008MMX/NOPB part is unused and in its original packaging.
Return procedure for LM5008MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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