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Texas Instruments LM5010AMHX
- Part No.:
- LM5010AMHX
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5010AMHX.pdf
- Description:
- IC REG BUCK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,348
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Product details
Overview
LM5010AMHX from Texas Instruments is a high-voltage 1-A synchronous step-down DC/DC switching regulator with integrated 80-V N-channel buck switch, constant ON-time control architecture, and wide 6-V to 75-V input range. It delivers regulated output up to 1 A with 2.5-V ±2% feedback reference, programmable soft-start, and valley current limit at 1.25 A - used in automotive post-regulation and telecom power supplies.
For engineers reviewing the LM5010AMHX datasheet, LM5010AMHX pinout, LM5010AMHX application, or LM5010AMHX equivalent, key selection considerations include its 10-pin WSON package with exposed thermal pad, no-loop-compensation design, 260-ns minimum OFF-time, and VIN-referenced ON-time programming via RON resistor.
Technical Context
The LM5010AMHX implements a constant ON-time (COT) control scheme where tON is inversely proportional to VIN and set by an external RON resistor - enabling stable operation without external compensation components. Its valley current limit detection operates during SW OFF-time using internal 130-mΩ sense resistor and ISEN/SGND terminals.
It integrates a high-voltage bias regulator that tracks VIN below 8.9 V and regulates VCC at 7 V above that threshold, with UVLO at 5.25 V and thermal shutdown at 175°C. The bootstrap gate driver (BST–SW) supports floating high-side N-MOSFET operation with 0.022-µF recommended ceramic capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - enables direct connection to 48-V telecom or 42-V automotive bus without pre-regulation |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh environments |
| Feedback Reference | 2.5 V ±2% - sets precise output voltage via external resistor divider (VOUT = 2.5 × (R1+R2)/R2) |
| Valley Current Limit | 1.25 A typical - protects against overloads and short circuits by disabling next ON-time when ISEN current exceeds threshold |
| Switching Frequency | Programmable up to 1 MHz - adjusted via RON resistor; fixed 260-ns minimum OFF-time ensures bootstrap capacitor recharge |
| Integrated Switch | 80-V N-channel MOSFET - eliminates external high-side switch and reduces BOM count and layout complexity |
| Thermal Shutdown | 175°C with 20°C hysteresis - automatically disables switching to prevent permanent damage during fault conditions |
Pinout & Package
LM5010AMHX is housed in a thermally enhanced 10-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad for improved heat dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switching node | Internally connected to source of integrated N-MOSFET; connects to inductor, freewheeling diode, and bootstrap capacitor |
| 2 (BST) | Bootstrap supply | Charged from VCC through internal diode during SW OFF-time; powers high-side gate driver |
| 3 (ISEN) | Current sense input | Receives recirculating inductor current during OFF-time; triggers valley current limit at 1.25 A |
| 4 (SGND) | Sense ground | Return path for current sense resistor; isolated from RTN to avoid noise coupling into regulation loop |
| 5 (RTN) | Circuit ground | Ground return for all internal circuitry except current sense path; connects to system ground plane |
| 6 (FB) | Voltage feedback | Compares output voltage (via resistor divider) to 2.5-V reference; controls ON-time initiation |
| 7 (SS) | Soft-start control | Internal 11.5-µA current source charges external capacitor to ramp output voltage gradually |
| 8 (RON/SD) | ON-time programming / shutdown | Resistor to VIN sets tON; grounding disables regulator and discharges SS capacitor |
| 9 (VCC) | Bias regulator output | Provides internal gate drive and logic power; self-biased (tracks VIN ≤8.9 V) or regulated at 7 V (VIN >8.9 V) |
| 10 (VIN) | Main input supply | Accepts 6–75 V; bypassed with low-ESR capacitor near pin to suppress transients and EMI |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates need for external compensation network - simplifies design and improves transient response |
| Ultra-fast transient response | Direct FB-to-ON-time relationship enables immediate correction of load steps without phase-margin concerns |
| Programmable soft-start | External SS capacitor sets startup ramp time - prevents inrush current and overshoot during power-up |
| Exposed thermal pad | Integral copper pad on underside enhances thermal conduction to PCB - lowers junction-to-board resistance to 13.2°C/W |
| Integrated high-voltage bias regulator | Eliminates need for external LDO or charge pump - supports direct 6–75-V input without auxiliary supply |
Applications
| Automotive Infotainment Power Supply | Industrial 48-V Telecom Rectifier |
|---|---|
Use Scenario: Powers display controller and audio codec in vehicle head unit from 12-V or 42-V battery rail with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 3.3 V/1 A with fast line/load transient recovery. Use Value: Wide 6–75-V input handles load-dump (up to 60 V) and cold-crank (down to 6 V); thermal shutdown prevents failure during prolonged overtemperature events. | Use Scenario: Generates 5 V for Ethernet PHY and management MCU from -48-V telecom rectified bus. IC Role / Device Role / Timing Role: Secondary-side post-regulator converting intermediate 12-V rail to stable 5-V output. Use Value: Valley current limit ensures reliable short-circuit protection; 1-MHz max frequency enables compact magnetics and low-profile layout. |
| LED Driver Bias Supply | Smart Sensor Node Power |
Use Scenario: Supplies bias voltage to LED driver IC in outdoor lighting fixture operating from 24–48-V DC distribution. IC Role / Device Role / Timing Role: High-efficiency step-down converter feeding constant-current LED driver input. Use Value: Integrated 80-V switch withstands surge transients; exposed thermal pad maintains reliability in sealed enclosures. | Use Scenario: Powers wireless sensor module (MCU + RF transceiver) in predictive maintenance equipment powered from industrial 24-V bus. IC Role / Device Role / Timing Role: Primary power conversion stage delivering 3.3 V with low quiescent current and robust ESD immunity. Use Value: 1.25-A valley current limit accommodates peak RF transmit currents; AEC-Q100 Grade 1 qualification ensures operation from –40°C to 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5010MHX | Same functional spec but non-automotive grade; lacks AEC-Q100 qualification and extended temperature support | Not suitable for automotive safety-critical systems requiring Grade 1 or Grade 0 qualification | Select LM5010MHX only for cost-sensitive industrial or telecom designs without automotive qualification requirements |
| LM5164HWR | Wettable flank 12-pin WQFN; wider 3–100-V input; 0.6-A output; includes spread-spectrum and precision enable | Lower output current and different pinout; requires layout redesign and new compensation | Choose LM5164HWR when input exceeds 75 V or spread-spectrum EMI reduction is mandatory |
Compared with LM5010MHX, the LM5010AMHX adds AEC-Q100 Grade 1 qualification and tighter thermal shutdown hysteresis; versus LM5164HWR, it offers higher output current and simpler ON-time programming but lacks spread-spectrum and ultra-wide input range.
Availability
LM5010AMHX is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 48-V telecom rectifiers, and smart sensor node power supplies requiring stable component supply across long production lifecycles.
Supply support for LM5010AMHX 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 and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.
The LM5010A product line delivers high-voltage buck regulators optimized for rugged applications where wide input range, integrated FETs, and minimal external components are critical - targeting automotive body electronics and telecom infrastructure.
FAQ
What is the maximum allowable input voltage for the LM5010AMHX?
The LM5010AMHX supports an absolute maximum input voltage of 75 V applied between VIN and RTN. Exceeding this rating risks permanent damage. For reliable operation, maintain VIN within the recommended 6-V to 75-V range per datasheet Section 6.4. The device's internal 80-V N-channel switch and BST-to-SW rating of 14 V further define safe operating boundaries. Always use appropriate input filtering and transient suppression when operating near the upper limit.
How does the RON/SD pin function in the LM5010AMHX?
The RON/SD pin on the LM5010AMHX serves dual functions: connecting a resistor from VIN sets the ON-time duration, while pulling the pin below 0.7 V shuts down the regulator. During shutdown, the SS capacitor discharges, the ON-timer disables, and VCC bias is turned off. This pin enables both programmable frequency control and remote enable/disable capability - essential for power sequencing in multi-rail systems. The internal hysteresis of 40 mV prevents chatter during transition.
Can the LM5010AMHX operate without an external bootstrap capacitor?
No, the LM5010AMHX requires an external ceramic bootstrap capacitor (typically 0.022 µF) between BST and SW pins. This capacitor supplies gate drive voltage for the integrated N-channel high-side switch during each ON-cycle. Without it, the gate driver cannot sustain proper gate voltage, causing switch failure or erratic operation. The 260-ns minimum OFF-time ensures sufficient recharge time - omitting the capacitor violates the fundamental gate drive architecture and will result in immediate malfunction.
What is the purpose of the SGND and RTN pins on the LM5010AMHX?
The LM5010AMHX separates sense ground (SGND) from circuit ground (RTN) to isolate current-sensing paths from noisy power return currents. SGND carries only the recirculating inductor current during OFF-time for accurate valley current limit detection, while RTN serves as the common return for all other internal circuitry. This separation prevents ground bounce from corrupting the 1.25-A current limit threshold and improves regulation stability - especially critical in high-noise automotive or industrial environments where shared ground paths introduce measurement error.
Does the LM5010AMHX require external compensation components?
No, the LM5010AMHX uses a constant ON-time (COT) control architecture that inherently eliminates the need for external loop compensation components such as type-II or type-III networks. Its regulation relies on direct comparison of FB voltage to the 2.5-V reference and VIN-dependent ON-time generation - resulting in stable operation across line and load variations without phase-margin tuning. This simplifies design, reduces bill-of-materials cost, and accelerates time-to-market compared to voltage-mode or current-mode controllers requiring compensation.
LM5010AMHX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm 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):
- 6V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 70V
- Current - Output:
- 1A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM5010AMHX FAQ
1.How can I place an order for LM5010AMHX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5010AMHX 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 LM5010AMHX reliable?
The price and inventory of LM5010AMHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5010AMHX is usually 5 days.
3.What payment methods are accepted for LM5010AMHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5010AMHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5010AMHX?
LM5010AMHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5010AMHX 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 LM5010AMHX?
For technical support, including LM5010AMHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5010AMHX requirements.
6.How does Aetrix verify that LM5010AMHX is sourced from the original manufacturer or authorized distributors?
All LM5010AMHX 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 LM5010AMHX meets industry standards.
7.What is the process for return or replacement of LM5010AMHX?
All LM5010AMHX units undergo pre-shipment inspection (PSI). If there is an issue with LM5010AMHX, 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 LM5010AMHX part is unused and in its original packaging.
Return procedure for LM5010AMHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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