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Texas Instruments LM5008MM/NOPB
- Part No.:
- LM5008MM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5008MM/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,430
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Product details
Overview
LM5008MM/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 regulator, and no loop compensation required. It operates from 9.5 V to 95 V input, delivers regulated output down to 2.5 V via external resistor divider, and features intelligent current limit protection with programmable off-time. Used in high-voltage post-regulation for telecom and automotive systems.
For engineers reviewing the LM5008MM/NOPB datasheet, LM5008MM/NOPB pinout, LM5008MM/NOPB application, or LM5008MM/NOPB equivalent, key selection criteria 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 COT control enabling fast transient response without compensation.
Technical Context
The LM5008MM/NOPB implements a hysteretic constant-on-time control architecture where on-time varies inversely with VIN (TON = 1.25×10−10 × RON/VIN), maintaining near-constant frequency across line and load. It operates in discontinuous conduction mode (DCM) at light loads and continuous conduction mode (CCM) at higher loads, with automatic mode transition.
Regulation uses an internal 2.5-V reference comparator monitoring FB; overvoltage protection triggers at 2.875 V. Current limiting employs a non-resettable off-timer set by RCL and FB voltage (TOFF = 10−5 / (0.285 + (VFB/6.35×10−6 × RCL))), providing short-circuit protection with minimal foldback.
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 rails without external pre-regulator. |
| Output Current | 350 mA DC - sufficient for auxiliary power supplies in base stations, industrial controllers, and HV sensors. |
| Switch RDS(on) | 1.15 Ω (typ @ 25°C) - enables high efficiency at 48-V input with low conduction loss in integrated N-MOSFET. |
| Feedback Reference | 2.5 V ±2.2% - precise internal reference sets output voltage via resistor divider (VOUT = 2.5 × (R1+R2)/R2). |
| Current Limit Threshold | 0.51 A (typ @ 25°C) - protects against overload and short-circuit while allowing peak inductor current margin. |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - prevents permanent damage during sustained overloads or poor heatsinking. |
| Minimum Off-Time | 300 ns - ensures reliable bootstrap capacitor recharge and stable operation at high input voltages. |
Pinout & Package
LM5008MM/NOPB is packaged in an 8-pin VSSOP (DGK) with 3.00 mm × 3.00 mm body size and exposed thermal pad (not electrically connected). The package supports high-power density layouts with low thermal resistance (RθJA = 139.7 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching output connected to inductor, freewheeling diode, and bootstrap capacitor - must be routed with minimal parasitic inductance. |
| 2 BST | Bootstrap supply input | Accepts external 0.01-µF ceramic capacitor between BST and SW to provide gate drive voltage for internal N-MOSFET. |
| 3 RCL | Current limit off-time set | Resistor to RTN programs off-time duration during current limit events - determines short-circuit recovery behavior. |
| 4 RTN | Ground reference | Common return for all analog and power circuits - requires low-impedance connection to system ground plane. |
| 5 FB | Feedback input | Connects to resistor divider output; compared to 2.5-V internal reference to regulate VOUT - bias current ≤100 nA. |
| 6 RON/SD | On-time set / shutdown control | Resistor to VIN sets TON; pulled low (<0.7 V) disables regulator - dual-function pin enables remote ON/OFF control. |
| 7 VCC | Internal 7-V regulator output | Supplies gate drive and internal circuitry; self-biased up to 14 V - local 0.1-µF decoupling required. |
| 8 VIN | Main input supply | Accepts 9.5–95 V DC; withstands 100-V transients - connects directly to high-voltage rail without external components. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic COT control eliminates external compensation network - reduces BOM count and design iteration time. |
| Ultra-fast transient response | On-time adjustment per cycle enables immediate correction to load steps - critical for burst-mode or pulsed-load applications. |
| Intelligent current limit protection | FB-dependent off-time prevents excessive foldback during partial overloads - maintains faster recovery than fixed-timer schemes. |
| Integrated 100-V N-channel buck switch | Eliminates external high-voltage MOSFET and driver - simplifies layout and improves reliability in space-constrained designs. |
| Self-bias VCC option | VCC pin accepts auxiliary 8–14 V supply to disable internal regulator - reduces power dissipation at high VIN. |
Applications
| Telecom Power Supply | Automotive 48-V System |
|---|---|
|
Use Scenario: Non-isolated buck conversion from 48-V telecom rectified bus to 3.3-V or 5-V logic supply in remote radio units. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable low-voltage rail with fast load-step response to FPGA or DSP cores. Use Value: Eliminates need for isolated flyback or pre-regulator stage - reduces solution size and cost while maintaining >85% efficiency at full load. |
Use Scenario: Secondary regulation in 48-V mild-hybrid vehicle subsystems (e.g., ADAS camera ECU, infotainment display backlight). IC Role / Device Role / Timing Role: High-input-voltage buck converter powering microcontrollers and sensors from battery-derived 48-V rail. Use Value: Withstands load dump transients up to 95 V - avoids external TVS clamping and enables direct connection to vehicle bus. |
| Industrial Sensor Node | High-Voltage Post-Regulator |
|
Use Scenario: Powering wireless sensor nodes from long-line 24-V or 48-V PoE-like distribution in factory automation. IC Role / Device Role / Timing Role: Efficient local DC/DC conversion supplying 3.3-V MCU and RF transceiver from unregulated HV supply. Use Value: 76 µA shutdown current extends battery life in sleep modes - supports energy harvesting and low-duty-cycle operation. |
Use Scenario: Final-stage regulation after front-end AC/DC or isolated DC/DC in industrial PLC power modules. IC Role / Device Role / Timing Role: Precision-adjustable buck regulator stabilizing output voltage despite upstream ripple and line variation. Use Value: 2.5-V reference with ±2.2% tolerance and 100-nA FB bias enables accurate <1% output regulation with standard resistors. |
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 IOUT (500 mA), synchronous rectification, but requires loop compensation. | Better suited for high-efficiency, high-current applications where PCB area allows compensation components. | Select LM5164PWPR when >350 mA output or synchronous efficiency is mandatory; LM5008MM/NOPB preferred for simplicity and cost-sensitive designs. |
| MAX5033BASA+ | Lower IIN (300 mA), narrower input (7.5–76 V), no integrated switch - external MOSFET required. | Used where external FET selection is needed for thermal or voltage rating flexibility. | Choose MAX5033BASA+ only if external switch control or specific FET integration is required; LM5008MM/NOPB offers lower BOM count and smaller footprint. |
Compared with LM5164PWPR and MAX5033BASA+, the LM5008MM/NOPB provides the simplest implementation for 350-mA, 95-V buck conversion - eliminating both compensation network and external MOSFET while maintaining robust protection and thermal performance in a compact VSSOP package.
Availability
LM5008MM/NOPB is available at Aetrix Electronics and suitable for telecom power supplies, 48-V automotive subsystems, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM5008MM/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 LM5008MM/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for cost-sensitive, space-constrained applications needing simple, robust buck conversion from 9.5 V to 95 V inputs.
FAQ
What is the minimum input voltage required for reliable startup of the LM5008MM/NOPB?
The LM5008MM/NOPB requires a minimum input voltage of 9.5 V to ensure proper startup and VCC regulation. Below this threshold, the internal 7-V series regulator cannot reach its 6.3-V UVLO turn-on point, preventing switch activation. Startup is guaranteed across –40°C to 125°C ambient when VIN ≥ 9.5 V and the VCC capacitor (C3) is properly sized (0.1 µF ceramic).
Can the LM5008MM/NOPB operate without an external bootstrap capacitor?
No, the LM5008MM/NOPB 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 each on-time. Omitting it causes immediate gate drive failure and switch malfunction. The internal bootstrap diode charges this capacitor during off-time, relying on the 300-ns minimum off-timer for reliable recharge.
How does the LM5008MM/NOPB handle short-circuit conditions?
Under short-circuit, the LM5008MM/NOPB detects overcurrent (>0.51 A) and initiates a non-resettable off-timer programmed by RCL and FB voltage. When FB ≈ 0 V (as in hard short), off-time defaults to 35 µs - limiting power dissipation and enabling safe operation even at 95-V input. Recovery occurs only after FB rises above 2.5 V, preventing latch-up.
Is the LM5008MM/NOPB pin-compatible with other members of the LM50xx family?
No, the LM5008MM/NOPB is not pin-compatible with other LM50xx devices such as LM5007 or LM5017. Its 8-pin VSSOP pinout (SW/BST/RCL/RTN/FB/RON-SD/VCC/VIN) is unique to the LM5008 family. Substituting other LM50xx parts requires PCB redesign due to differing pin functions, internal architectures, and protection schemes.
What is the maximum recommended output voltage achievable with the LM5008MM/NOPB?
The LM5008MM/NOPB supports output voltages up to 90 V, limited by the 100-V absolute maximum rating of the internal switch and the 2.5-V feedback reference. Using standard resistor dividers (e.g., R1 = 3.57 MΩ, R2 = 100 kΩ), VOUT = 2.5 × (R1+R2)/R2 yields ~90 V. Higher outputs require careful attention to voltage ratings of external components (diode, capacitor, inductor) and layout creepage/clearance.
LM5008MM/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:
- Not For New Designs
- 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
LM5008MM/NOPB FAQ
1.How can I place an order for LM5008MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008MM/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 LM5008MM/NOPB reliable?
The price and inventory of LM5008MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008MM/NOPB?
LM5008MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008MM/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 LM5008MM/NOPB?
For technical support, including LM5008MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008MM/NOPB requirements.
6.How does Aetrix verify that LM5008MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008MM/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 LM5008MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008MM/NOPB?
All LM5008MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008MM/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 LM5008MM/NOPB part is unused and in its original packaging.
Return procedure for LM5008MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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