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Texas Instruments LM26003QMHX/E7002413
- Part No.:
- LM26003QMHX/E7002413
- Manufacturer:
- Texas Instruments
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LM26003QMHX/E7002413.pdf
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Product details
Overview
LM26003QMHX/E7002413 from Texas Instruments is a 3-A synchronous step-down DC/DC converter with current-mode control, 4.0–38-V input range, 150–500-kHz adjustable switching frequency, and high-efficiency sleep mode (40 µA typical Iq). It integrates an N-channel high-side MOSFET, internal bootstrap diode, and power-good flag-designed for automotive telematics and in-dash instrumentation requiring stable light-load efficiency.
For engineers reviewing the LM26003QMHX/E7002413 datasheet, LM26003QMHX/E7002413 pinout, LM26003QMHX/E7002413 application, or LM26003QMHX/E7002413 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (−40°C to +125°C), cycle-by-cycle current limit, FPWM disable-sleep function, and HTSSOP-20 thermal pad layout compatibility.
Technical Context
The LM26003QMHX/E7002413 implements current-mode PWM control with internal slope compensation, enabling precise duty-cycle regulation via inductor current sensing and COMP-pin error amplifier feedback. Its architecture supports discontinuous conduction mode (DCM) under light load in FPWM mode and off-pulse skipping during low-VIN dropout conditions.
It features dual UVLO detection (VIN and VDD), programmable soft-start via external capacitor on SS pin, and frequency foldback protection triggered below 0.9 V FB voltage-reducing switching frequency to 45 kHz minimum during short-circuit events while disabling SYNC functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 38 V continuous; operates down to 3.0 V during transients-supports wide automotive battery rail variation. |
| Output Current | Up to 3 A continuous; peak current limit 3.15–6.05 A over temperature-enables robust load handling with external inductor selection. |
| Quiescent Current | 40 µA typical in sleep mode (VBIAS = 5 V); 10.8 µA in shutdown-minimizes standby power in always-on systems. |
| Feedback Reference | 1.236 V ±1.5% over temperature-ensures accurate output voltage regulation with standard resistor-divider design. |
| Switching Frequency | Adjustable 150–500 kHz via single FREQ-pin resistor; synchronizable ±20%/+30% to external clock-enables EMI optimization and multi-rail coordination. |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown (160°C), UVLO (2.96 V VIN threshold), frequency foldback, and PGOOD flag-provides comprehensive fault coverage without external circuitry. |
| Package | 20-pin HTSSOP (6.50 mm × 4.40 mm) with exposed thermal pad-supports high-power density PCB layouts with direct GND thermal path. |
Pinout & Package
LM26003QMHX/E7002413 uses a 20-pin HTSSOP package with exposed thermal pad (EP) connected to AGND/PGND. Pin numbering follows top-view orientation; EP must be soldered to PCB GND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | High-side switch power input | Three parallel VIN pins reduce trace resistance and improve current sharing for high-current paths. |
| AVIN (4) | Analog supply input | Bypassed with ≥100 nF ceramic capacitor near pin-stabilizes internal bias and improves current-sense accuracy. |
| PGOOD (5) | Open-drain power-good flag | Asserts high when VOUT > 92% of nominal; includes 2–6% hysteresis-enables system sequencing and fault monitoring. |
| EN (6) | Enable control input | Active-high analog threshold (0.8 V low, 1.18 V typical rising); 180 mV hysteresis prevents chatter during slow-rising rails. |
| SS (7) | Soft-start timing node | 2.5 µA internal current charges external capacitor-controls output ramp rate and eliminates inrush current at startup. |
| COMP (8) | Error amplifier compensation | Connect RC network to set loop stability; transconductance 400–1000 µmho enables Type II/III compensation design. |
| FB (9) | Output voltage feedback | 1.236 V reference; ±200 nA bias current allows high-impedance resistor dividers without loading error. |
| AGND (10) | Analog ground reference | Separate from PGND-must be star-connected to minimize noise coupling into feedback and control circuits. |
| PGND (11) | Power ground return | Low-inductance path for switch node current; ties directly to EP and input/output capacitors' ground planes. |
| FREQ (12) | Frequency setting node | Resistor-to-GND sets fSW from 150–500 kHz; empirical formula RFREQ = (6.25×10¹⁰) × fSW⁻¹·⁰⁴² applies. |
| FPWM (13) | Sleep mode disable | Pull high (>1.24 V) to force continuous PWM operation-eliminates frequency variation but increases light-load Iq. |
| SYNC (14) | External clock synchronization | Accepts square wave; falling edge triggers switch turn-on; requires ≥1.23 V peak and 10 kΩ pulldown if unused. |
| VBIAS (15) | External bias supply input | Connect to ≥3 V source (e.g., VOUT) to bypass internal LDO-reduces VIN current and improves full-load efficiency. |
| VDD (16) | Internal regulator output | 5.5–6.5 V output; bypass with ≥1 µF ceramic capacitor-powers internal circuitry and can drive light external loads. |
| BOOT (17) | Bootstrap gate-drive supply | Connect 0.1 µF ceramic capacitor to SW-generates high-side FET gate voltage above SW potential. |
| SW (18,19,20) | Switch node outputs | Three parallel SW pins reduce parasitic inductance and thermal stress-connect directly to inductor and catch diode/anode. |
| EP | Exposed thermal pad | Must be soldered to solid GND copper area-primary thermal path; contributes to RθJA = 25.4°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | 40 µA typical Iq enables >90% efficiency at 10 mA load-critical for automotive infotainment standby power budgets. |
| Integrated bootstrap diode | Eliminates external bootstrap diode-reduces BOM count and layout area while maintaining reliable high-side gate drive. |
| Adjustable soft-start | Programmable ramp time via SS capacitor-prevents output overshoot and inrush current during cold start or reset. |
| Power-good flag with hysteresis | 92% VOUT threshold with 2–6% hysteresis-provides clean, chatter-free system enable signaling for downstream processors. |
| AEC-Q100 Grade 1 qualification | Rated for −40°C to +125°C junction temperature-meets automotive reliability requirements for telematics and instrument clusters. |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
|
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and CAN interface ICs in vehicle-mounted tracking units. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V buck regulator delivering regulated power with low quiescent current during vehicle sleep modes. Use Value: Sleep-mode Iq of 40 µA ensures <100 µA total system standby current-meeting OEM requirements for 10-year battery drain limits. |
Use Scenario: Supplying display controllers, touch processors, and flash memory in embedded automotive navigation head units. IC Role / Device Role / Timing Role: High-current (≥2 A) intermediate rail generator stepping down 12-V battery to 5-V or 3.3-V logic supplies. Use Value: 3-A capability and 4.0–38-V input range accommodate cold-crank (4.5 V) and load-dump (38 V) transients without derating. |
| In-Dash Instrumentation | Battery-Powered Applications |
|
Use Scenario: Powering digital gauges, LED backlight drivers, and microcontrollers in modern electronic instrument clusters. IC Role / Device Role / Timing Role: Main power converter with PGOOD signaling to MCU for safe boot sequencing and fault reporting. Use Value: PGOOD flag with 92% threshold and built-in hysteresis ensures reliable system initialization even with ±5% output tolerance. |
Use Scenario: Regulating power for portable test equipment, handheld scanners, and industrial data loggers operating from Li-ion or 12-V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting both nominal battery voltage and deeply discharged states (down to 3.0 V). Use Value: Low-VIN operation to 3.0 V with off-pulse skipping maintains regulation during battery sag-extending usable runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26003Q1MHX/NOPB | Identical electrical specs and pinout; automotive-grade variant with AEC-Q100 Grade 1 certification and enhanced ESD (±2 kV HBM on corner pins). | Qualified for safety-critical automotive modules where LM26003QMHX/E7002413's commercial qualification is insufficient. | Select LM26003Q1MHX/NOPB when full AEC-Q100 documentation, PPAP support, and extended temperature validation are required. |
| LM26002QMHX/NOPB | 2-A version with identical package, pinout, and feature set; shares same control architecture but lower current limit (2.1 A typical). | Suitable for lower-power subsystems like sensor hubs or audio amplifiers where 3-A headroom is unnecessary. | Choose LM26002QMHX/NOPB to reduce cost and thermal design complexity when load current remains ≤1.8 A continuous. |
Compared with LM26003QMHX/E7002413, LM26003Q1MHX/NOPB adds formal automotive qualification without altering performance, while LM26002QMHX/NOPB reduces current capability and thermal margin-both require no PCB changes but differ in qualification scope and power delivery ceiling.
Availability
LM26003QMHX/E7002413 is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, and in-dash instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM26003QMHX/E7002413 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 with over 50 years of automotive IC experience.
The LM26003 product line delivers high-efficiency, wide-input buck regulators optimized for automotive infotainment, body electronics, and ADAS subsystems-emphasizing low-Iq, transient robustness, and AEC-Q100 compliance.
FAQ
What is the operating temperature range for LM26003QMHX/E7002413?
The LM26003QMHX/E7002413 is rated for −40°C to +125°C junction temperature per its AEC-Q100 Grade 1 qualification. This range is validated for continuous operation under automotive ambient conditions, including engine bay proximity and cabin-mounted electronics. The device incorporates thermal shutdown at 160°C to prevent damage during overload or poor heatsinking. All electrical specifications-including reference voltage, current limit, and switching frequency-are guaranteed across this full range.
Does LM26003QMHX/E7002413 support synchronization to an external clock?
Yes, LM26003QMHX/E7002413 supports external clock synchronization via the SYNC pin. It accepts a square-wave input with ≥1.23 V peak amplitude and synchronizes to the falling edge, allowing frequency adjustment from −20% to +30% of the nominal value set by the FREQ resistor. The SYNC pin must be pulled low via a 10 kΩ resistor if unused. During synchronization, frequency foldback is disabled if FB falls below 0.9 V, ensuring predictable behavior in fault conditions.
How does the sleep mode function in LM26003QMHX/E7002413?
LM26003QMHX/E7002413 enters sleep mode automatically under light load to reduce quiescent current to 40 µA typical. Wake-up occurs when FB voltage rises above 101.3% of the wake threshold (1.236 V), triggering immediate PWM resumption. Sleep mode is disabled by pulling FPWM high (>1.24 V), forcing continuous PWM operation-even at light loads-though this increases Iq to 160–850 µA depending on VBIAS configuration.
What is the purpose of the VBIAS pin on LM26003QMHX/E7002413?
The VBIAS pin on LM26003QMHX/E7002413 allows connection to an external ≥3-V supply (e.g., VOUT) to bypass the internal LDO, reducing VIN current draw and improving full-load efficiency. When active, VBIAS supplies internal circuitry instead of VDD, lowering total system power dissipation. If unused, VBIAS must be tied to GND. Dropping below 2.9 V causes automatic switchover back to internal regulation.
Can LM26003QMHX/E7002413 operate with input voltage below 4.0 V?
Yes, LM26003QMHX/E7002413 can operate with input voltage as low as 3.0 V during line transients, though nominal operation begins at 4.0 V. Below 4.0 V, RDS(ON) increases due to reduced gate drive, and off-pulse skipping activates to maintain regulation. This capability supports cold-crank scenarios in automotive systems. However, UVLO triggers at 2.96 V (typical), causing shutdown if VIN remains below this threshold.
LM26003QMHX/E7002413 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
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- Supplier Device Package:
- -
LM26003QMHX/E7002413 FAQ
1.How can I place an order for LM26003QMHX/E7002413 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26003QMHX/E7002413 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 LM26003QMHX/E7002413 reliable?
The price and inventory of LM26003QMHX/E7002413 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26003QMHX/E7002413 is usually 5 days.
3.What payment methods are accepted for LM26003QMHX/E7002413?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26003QMHX/E7002413 transactions.
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4.How is shipping managed for LM26003QMHX/E7002413?
LM26003QMHX/E7002413 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26003QMHX/E7002413 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 LM26003QMHX/E7002413?
For technical support, including LM26003QMHX/E7002413 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26003QMHX/E7002413 requirements.
6.How does Aetrix verify that LM26003QMHX/E7002413 is sourced from the original manufacturer or authorized distributors?
All LM26003QMHX/E7002413 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 LM26003QMHX/E7002413 meets industry standards.
7.What is the process for return or replacement of LM26003QMHX/E7002413?
All LM26003QMHX/E7002413 units undergo pre-shipment inspection (PSI). If there is an issue with LM26003QMHX/E7002413, 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 LM26003QMHX/E7002413 part is unused and in its original packaging.
Return procedure for LM26003QMHX/E7002413:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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