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Texas Instruments LM5008AMMX/NOPB
- Part No.:
- LM5008AMMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5008AMMX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,541
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Product details
Overview
LM5008AMMX/NOPB from Texas Instruments is a 95-V input, 350-mA constant-on-time (COT) synchronous buck switching regulator with integrated 100-V N-channel MOSFET, 2.5-V internal reference, and no loop compensation required. It operates from 6 V to 95 V input, delivers adjustable output down to 2.5 V, and targets high-voltage industrial power rails and automotive post-regulation.
For engineers reviewing the LM5008AMMX/NOPB datasheet, LM5008AMMX/NOPB pinout, LM5008AMMX/NOPB application, or LM5008AMMX/NOPB equivalent, key selection considerations include its 35 µs programmable current-limit off-time, 400 ns minimum on-time at 95 V, thermal shutdown at 165°C, and dual-package availability in VSSOP-8 and WSON-8 for layout flexibility.
Technical Context
The LM5008AMMX/NOPB implements a constant-on-time control architecture where on-time varies inversely with VIN (TON ∝ 1/VIN), enabling near-constant switching frequency across line and load variations. Its regulation relies on a 2.5-V precision internal reference compared against FB voltage, with overvoltage protection triggered at 2.875 V.
Current limiting uses an intelligent off-timer whose duration is set by RCL and modulated by FB voltage-35 µs at FB = 0 V (short-circuit), scaling down under partial overload. Startup employs an integrated high-voltage series pass regulator delivering 7-V VCC, with bypass mode below 8.5 V VIN and UVLO at 5.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports direct connection to 12 V, 24 V, 48 V, and telecom -48 V rails with 100-V absolute max rating. |
| Output Current | 350 mA DC - sufficient for powering auxiliary rails in industrial controllers and automotive ECUs without external boost. |
| Feedback Reference | 2.5 V ±55 mV - enables precise output programming via resistor divider; ripple-based regulation requires ≥25 mV FB ripple. |
| On-Time Min/Max | 400 ns at 95 V / 2.77 µs at 10 V - ensures stable current limit operation and sets practical upper frequency bound per design. |
| Current Limit Threshold | 0.51 A typical - protects internal switch during overload; off-time scales with FB to minimize foldback in partial faults. |
| Thermal Shutdown | 165°C with 25°C hysteresis - automatically disables switch and recovers when junction cools to ~140°C, preventing thermal runaway. |
| VCC Regulator | 7 V output, 9.2 mA current limit - powers gate driver and internal circuitry; bypasses to VIN below 8.5 V with 100 Ω on-resistance. |
Pinout & Package
LM5008AMMX/NOPB is available in 8-pin VSSOP (DGK) package, 3.00 mm × 3.00 mm body size, with exposed pad not electrically connected. Pin functions are validated per TI SNVS583H datasheet Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching node connecting to inductor, freewheeling diode, and bootstrap capacitor; carries pulsed high-current paths. |
| 2 BST | Bootstrap supply | Input to floating gate driver; requires 0.01-µF ceramic cap to SW; charged from VCC during off-time via internal diode. |
| 3 RCL | Current limit off-time set | Resistor-to-RTN sets forced off-time duration after current limit trip; 35 µs default when FB = 0 V (short-circuit). |
| 4 RTN | Ground reference | Common ground return for feedback, shutdown, and current limit circuits; must be low-impedance connection to system GND. |
| 5 FB | Feedback input | Inverting input of regulation comparator; 2.5-V threshold; 100 nA bias current; requires ≥25 mV ripple for stable COT operation. |
| 6 RT/SD | On-time set / shutdown | Resistor-to-VIN sets on-time; pulled to GND (<0.7 V) disables regulator with 110 µA shutdown current. |
| 7 VCC | Bias supply output | 7-V regulated output powering gate driver; requires 0.47-µF local decoupling; UVLO at 5.3 V prevents startup until stable. |
| 8 VIN | Main input supply | Primary power input (6–95 V); supplies internal bias regulator and switch; withstands 100-V transients. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time architecture eliminates external compensation network, reducing BOM count and design iteration time. |
| Intelligent current limit | Off-time scales with FB voltage: 35 µs at short-circuit (FB = 0 V), shorter under partial overload - minimizes foldback and improves recovery. |
| Pre-charge switch | 150-ns pulse during minimum off-time recharges BST capacitor under light-load or pre-biased conditions - prevents gate drive dropout. |
| Discontinuous conduction mode | Automatic DCM entry at light loads reduces switching losses and maintains >80% efficiency down to 10 mA output current. |
| VCC bypass & regulation | Seamless transition between VIN tracking (6–8.5 V) and 7-V regulation (>8.5 V) - optimizes bias efficiency across full input range. |
Applications
| Industrial Power Supply | Automotive ECU Post-Regulator |
|---|---|
Use Scenario: Step-down conversion from unregulated 24 V or 48 V factory bus to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated auxiliary rail; operates in CCM at full load, transitions to DCM at standby. Use Value: Eliminates need for external compensation and reduces solution footprint by 30% vs. voltage-mode controllers with similar input range. | Use Scenario: Secondary regulation in engine control units converting 12 V battery-derived 48 V rail to stable 5 V for microcontroller peripherals. IC Role / Device Role / Timing Role: High-voltage post-regulator handling cold-crank (6 V) to load-dump (95 V) transients while maintaining tight output regulation. Use Value: Integrated 100-V switch and 165°C thermal shutdown enable robust operation without external protection circuitry. |
| Telecom -48 V Backup System | High-Voltage IoT Gateway |
Use Scenario: Non-isolated buck stage in telecom backup systems converting -48 V nominal (up to -72 V) to +5 V for management processors. IC Role / Device Role / Timing Role: Input-referred buck controller operating with inverted polarity configuration; leverages wide VIN range and fast transient response. Use Value: 2.5-V reference and ripple-based regulation tolerate higher output capacitor ESR, simplifying selection of long-life polymer capacitors. | Use Scenario: Powering wireless modem and security MCU in outdoor smart meter gateways powered from 48 V PoE or solar charge controller. IC Role / Device Role / Timing Role: Primary DC/DC converter managing variable input (36–95 V) and burst-mode loads; uses DCM for ultra-low quiescent current. Use Value: 110 µA shutdown current and 550 µA operating current extend battery backup runtime during grid outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5008MMX/NOPB | Base variant with 8 V min input; lacks 6 V startup capability and has different on-time equation. | Not suitable for cold-crank automotive (6 V) or low-input industrial systems. | Select LM5008AMMX/NOPB when operation below 8 V is required or when matching LM5008A-specific timing behavior. |
| LM5164QDDARQ1 | Automotive-grade 100-V buck with 150-mA output, valley current mode, and AEC-Q100 qualification. | Designed for ASIL-B systems; includes spread-spectrum, enhanced fault reporting, and wider temp range (–40°C to 150°C). | Choose LM5164QDDARQ1 for safety-critical automotive applications requiring qualification and diagnostic features. |
Compared with LM5008MMX/NOPB, the LM5008AMMX/NOPB enables lower-voltage startup and tighter transient response due to its optimized COT algorithm; versus LM5164QDDARQ1, it offers higher output current and simpler implementation but lacks automotive qualification and advanced diagnostics.
Availability
LM5008AMMX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU subsystems, telecom infrastructure, and high-voltage IoT gateways requiring stable component supply and long-term manufacturability.
Supply support for LM5008AMMX/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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM5008A belongs to TI's high-voltage DC/DC buck regulator product line, engineered specifically for cost-sensitive, space-constrained applications needing wide-input operation (6–95 V) without external loop compensation.
FAQ
What is the minimum input voltage supported by the LM5008AMMX/NOPB?
The LM5008AMMX/NOPB supports a minimum input voltage of 6 V, enabling reliable startup during automotive cold-crank conditions and low-voltage industrial brownouts. This is a functional distinction from the base LM5008 variant, which requires 8 V minimum. The 6 V capability is confirmed in TI's SNVS583H datasheet Section 3 (Description) and Section 6.3 (Recommended Operating Conditions).
Does the LM5008AMMX/NOPB require external compensation components?
No, the LM5008AMMX/NOPB does not require external compensation components. Its constant-on-time (COT) control architecture inherently provides stability without feedback loop compensation networks. This is explicitly stated in the Features section of the datasheet and verified in Section 7.3.1, where the control scheme is described as "no loop compensation required" - a core design advantage reducing BOM count and layout complexity.
How is the switching frequency determined for the LM5008AMMX/NOPB?
The LM5008AMMX/NOPB does not use a fixed-frequency oscillator. Instead, its operating frequency results from the interplay of programmed on-time (set by RT resistor and inversely proportional to VIN) and load-dependent off-time. In continuous conduction mode, frequency remains relatively constant across line and load; in discontinuous mode at light loads, frequency decreases to maintain efficiency. Equation 2 in the datasheet (Section 7.3.1) provides the approximate CCM frequency calculation.
What package options are available for the LM5008AMMX/NOPB?
The LM5008AMMX/NOPB is offered in two surface-mount packages: 8-pin VSSOP (DGK, 3.00 mm × 3.00 mm) and 8-pin WSON (NGU, 4.00 mm × 4.00 mm with exposed thermal pad). Both are RoHS-compliant and lead-free. The VSSOP variant is used in the LM5008AMMX/NOPB orderable part number; WSON is available under separate part numbers (e.g., LM5008ANGR/NOPB).
Can the LM5008AMMX/NOPB be used in automotive applications?
Yes, the LM5008AMMX/NOPB is suitable for non-safety-critical automotive applications such as infotainment power supplies, body control modules, and telematics gateways. It operates across –40°C to 125°C junction temperature, withstands 95 V input (covering load-dump transients), and includes thermal shutdown at 165°C. However, it is not AEC-Q100 qualified; for ASIL-B systems, TI recommends the automotive-grade LM5164QDDARQ1 instead.
LM5008AMMX/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):
- 6V
- Voltage - Input (Max):
- 95V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 75V
- Current - Output:
- 350mA
- Frequency - Switching:
- 50kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM5008AMMX/NOPB FAQ
1.How can I place an order for LM5008AMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008AMMX/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 LM5008AMMX/NOPB reliable?
The price and inventory of LM5008AMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008AMMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008AMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008AMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008AMMX/NOPB?
LM5008AMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008AMMX/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 LM5008AMMX/NOPB?
For technical support, including LM5008AMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008AMMX/NOPB requirements.
6.How does Aetrix verify that LM5008AMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008AMMX/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 LM5008AMMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008AMMX/NOPB?
All LM5008AMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008AMMX/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 LM5008AMMX/NOPB part is unused and in its original packaging.
Return procedure for LM5008AMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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