My Inquiry
My Account
Texas Instruments LM5008AMM/NOPB
- Part No.:
- LM5008AMM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5008AMM/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,329
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5008AMM/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 supports remote shutdown via RT/SD pin - used in 48-V automotive post-regulation and telecom power supplies.
For engineers reviewing the LM5008AMM/NOPB datasheet, LM5008AMM/NOPB pinout, LM5008AMM/NOPB application, or LM5008AMM/NOPB equivalent, key selection criteria include input voltage range (6–95 V), current limit threshold (0.51 A typ), minimum on-time (400 ns at 95 V), thermal shutdown (165°C), and dual-package availability (VSSOP-8/WSON-8).
Technical Context
The LM5008AMM/NOPB implements a constant-on-time control architecture where on-time varies inversely with VIN (TON = 1.385×10⁻¹⁰ × RT / VIN), enabling near-constant switching frequency across line and load variations. It operates in discontinuous conduction mode (DCM) at light loads and continuous conduction mode (CCM) at heavy loads, with automatic mode transition.
Its regulation relies on a 2.5-V precision internal reference compared against FB voltage; overvoltage protection triggers at 2.875 V. Current limiting uses an intelligent off-timer set by RCL and FB voltage - preset to 35 µs at short-circuit (FB = 0 V) and reduced under partial overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports direct connection to 48-V telecom/automotive rails and transient-tolerant operation up to 100 V. |
| Output Current | 350 mA DC - sufficient for low-power subsystems without external boost or parallel stages. |
| Internal Reference | 2.5 V ±22 mV (–40°C to 125°C) - sets output voltage accuracy via RFB1/RFB2 divider; enables 2.5 V minimum adjustable output. |
| Current Limit Threshold | 0.51 A (typ) at 25°C - protects switch during overload; decreases to 0.41 A at –40°C and increases to 0.61 A at 125°C. |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables switch until junction cools to ~140°C, preventing catastrophic failure. |
| Minimum On-Time | 400 ns at 95 V - constrains maximum achievable switching frequency and ensures reliable current limit operation. |
| VCC Regulator Output | 7 V regulated (6.6–7.4 V over temp) - powers gate driver; bypassed below 8.5 V VIN to reduce bias loss. |
Pinout & Package
LM5008AMM/NOPB is available in 8-pin VSSOP (DGK, 3.0 mm × 3.0 mm) and 8-pin WSON (NGU, 4.0 mm × 4.0 mm) packages. The exposed pad (EP) in WSON is thermally connected to GND but electrically isolated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Power switching node connecting to inductor, freewheeling diode, and bootstrap capacitor; carries high dv/dt and peak currents. |
| 2 BST | Bootstrap supply input | Accepts external 0.01-µF ceramic capacitor to SW; internal diode charges it from VCC during off-time for high-side gate drive. |
| 3 RCL | Current limit off-time set | Resistor-to-RTN sets intelligent off-time duration - 35 µs at FB = 0 V (short-circuit), scaled downward as FB rises. |
| 4 RTN | Ground reference | Common return for feedback, current limit, and shutdown circuits; must be low-impedance path to system ground. |
| 5 FB | Feedback input | Inverting input of regulation comparator referenced to 2.5 V; 100 nA bias current enables high-resistance divider networks. |
| 6 RT/SD | On-time set / shutdown | Resistor-to-VIN sets on-time; pulled to GND (≤0.7 V) to enter shutdown mode with 110 µA quiescent current. |
| 7 VCC | Bias regulator output | 7-V regulated supply for gate driver; requires 0.47-µF local decoupling; current-limited to 9.2 mA. |
| 8 VIN | Main input supply | Primary power input (6–95 V); powers internal start-up regulator and high-voltage bias circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time architecture eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Intelligent current limit off-timer | 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 at SW | 150-ns pulse during minimum off-time recharges bootstrap capacitor - prevents gate drive dropout during light-load or pre-biased start-up. |
| Integrated 100-V N-channel buck switch | 1.25 Ω RDS(on) at 25°C - enables single-chip solution for high-input-voltage step-down without external FET or driver. |
| VCC bypass and regulation | Auto-switches between VIN tracking (6–8.5 V) and 7-V regulation (>8.5 V) - optimizes efficiency across full input range. |
Applications
| 48-V Automotive Post-Regulation | Telecom Secondary Buck |
|---|---|
Use Scenario: Step-down from nominal 48-V battery rail to 3.3 V or 5 V for infotainment microcontrollers and sensors in commercial vehicles. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, efficient, and transient-robust power with minimal external components. Use Value: Enables direct 48-V input handling without pre-regulator stage; COT control delivers ultra-fast load transient response critical for MCU wake-up events. | Use Scenario: Generating 12 V or 15 V from –48 V telecom rectified bus for line card peripherals and interface ICs. IC Role / Device Role / Timing Role: High-voltage secondary regulator operating in DCM at light loads to maintain >85% efficiency across 10%–100% load range. Use Value: Eliminates need for isolated flyback in non-safety-critical subsystems; 95-V rating accommodates surge transients per GR-1089. |
| Industrial Sensor Power Supply | Smart Meter Auxiliary Rail |
Use Scenario: Deriving 3.3 V for low-power wireless sensor nodes powered from 24-V or 36-V industrial field buses. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter with shutdown capability for duty-cycled operation. Use Value: 110 µA shutdown current extends battery life; wide VIN range simplifies design across multiple field bus standards. | Use Scenario: Providing isolated auxiliary 5 V rail for metrology ASICs and RTC in polyphase smart meters fed from 120/240 VAC-derived DC bus. IC Role / Device Role / Timing Role: Robust primary-side buck regulator handling unregulated 60–90 V DC input from bridge rectifier and bulk capacitor. Use Value: 165°C thermal shutdown and 100-V absolute max rating ensure reliability in enclosed, high-temperature meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5017MH/NOPB | Higher 100-V input rating, 600-mA output, WSON-10 package; includes soft-start and sync input. | Supports higher load current and synchronized multi-rail designs; requires different PCB layout and external soft-start RC. | Select when >350 mA output or clock synchronization is required; not pin-compatible. |
| TPS54340DDAR | 42-V max input, 3.5-A output, current-mode control; requires external compensation and has different pinout. | Suitable for lower-input-voltage, higher-current applications; lacks 95-V capability and COT simplicity. | Choose for cost-sensitive 12/24-V systems needing >1 A output; incompatible with 48-V+ inputs. |
Compared with LM5017MH/NOPB and TPS54340DDAR, the LM5008AMM/NOPB offers the narrowest footprint and simplest implementation for 350-mA, 6–95-V buck conversion - trading off current capability and advanced features for minimal BOM count and zero-compensation design.
Availability
LM5008AMM/NOPB is available at Aetrix Electronics and suitable for 48-V automotive subsystems, telecom secondary regulation, industrial sensor nodes, smart meter auxiliary rails, and high-voltage IoT edge devices requiring stable component supply across long production lifecycles.
Supply support for LM5008AMM/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 specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM5008A product line delivers compact, high-input-voltage buck regulators targeting space-constrained applications in automotive, telecom, and industrial equipment where simplicity, efficiency, and transient performance are critical.
FAQ
What is the minimum recommended on-time for LM5008AMM/NOPB and why does it matter?
The minimum recommended on-time for LM5008AMM/NOPB is 400 ns at maximum input voltage (95 V). This value ensures reliable current limit detection and prevents false triggering during high-dv/dt switching events. If on-time falls below this threshold - due to excessive RT resistor value or high VIN - the current limit function may become ineffective, risking MOSFET overstress during overload conditions. Designers must verify on-time using TON = 1.385×10⁻¹⁰ × RT / VIN across the full operating range to guarantee robust protection in all use cases of LM5008AMM/NOPB.
How does the LM5008AMM/NOPB handle startup into a pre-biased output?
The LM5008AMM/NOPB incorporates a pre-charge switch at the SW pin that activates for ≈150 ns during the minimum off-time period. This feature forces a controlled charge path to the bootstrap capacitor even when the output is pre-biased, preventing gate drive collapse and ensuring reliable first-cycle turn-on. Unlike many COT regulators, LM5008AMM/NOPB avoids output voltage overshoot or latch-up during hot-swap or backup-supply scenarios because the pre-charge action maintains BST-SW voltage above gate drive UVLO (2.8 V) regardless of initial VOUT state - a verified behavior documented in TI's LM5008A datasheet Section 7.3.7.
Can LM5008AMM/NOPB operate without an output capacitor ESR?
No - LM5008AMM/NOPB requires a minimum 25–50 mV of ripple voltage at the FB pin for stable regulation, which depends on output capacitor ESR. If using ultra-low-ESR ceramics, an external series resistor (R3 in TI's functional diagram) must be added to generate sufficient ripple. Omitting ESR or R3 causes regulation instability, erratic switching, or failure to regulate because the COT controller relies on FB ripple amplitude to determine on-time initiation timing. This requirement is explicitly specified in Section 7.3.1 of the LM5008AMM/NOPB datasheet and confirmed across all tested operating conditions.
What is the purpose of the RCL pin on LM5008AMM/NOPB and how is it configured?
The RCL pin on LM5008AMM/NOPB sets the current limit off-time duration using an external resistor to RTN. At FB = 0 V (e.g., output short), off-time is fixed at 35 µs; as FB rises, off-time decreases linearly - reducing foldback severity during partial overloads. A typical 100-kΩ resistor yields 35 µs at short-circuit and ~2.56 µs at FB = 2.3 V. This intelligent scaling ensures fast recovery from mild faults while maintaining safe energy dissipation during hard shorts - a key differentiator from fixed off-time controllers. Configuration details and curves are provided in Figure 4 and Equation 5 of the LM5008AMM/NOPB datasheet.
Does LM5008AMM/NOPB support synchronization to an external clock?
No - LM5008AMM/NOPB does not support external clock synchronization. Its constant-on-time architecture inherently provides frequency stability across line and load variations without requiring sync input, but it lacks dedicated SYNC or PHASE pins. For applications demanding multi-rail synchronization (e.g., noise-sensitive ADC supplies), designers must select alternatives like LM5017MH/NOPB or TPS40210, which include sync capability. The LM5008AMM/NOPB datasheet makes no mention of sync functionality, and its pinout (RT/SD, FB, RCL, etc.) contains no provision for external clock injection - confirming standalone operation only.
LM5008AMM/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
LM5008AMM/NOPB FAQ
1.How can I place an order for LM5008AMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5008AMM/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 LM5008AMM/NOPB reliable?
The price and inventory of LM5008AMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5008AMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM5008AMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5008AMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5008AMM/NOPB?
LM5008AMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5008AMM/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 LM5008AMM/NOPB?
For technical support, including LM5008AMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5008AMM/NOPB requirements.
6.How does Aetrix verify that LM5008AMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5008AMM/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 LM5008AMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM5008AMM/NOPB?
All LM5008AMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5008AMM/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 LM5008AMM/NOPB part is unused and in its original packaging.
Return procedure for LM5008AMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5008AMM/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
