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Texas Instruments LM26003QMHX/NOPB
- Part No.:
- LM26003QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26003QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
LM26003QMHX/NOPB from Texas Instruments is a 3-A synchronous buck switching regulator with current-mode control, 4.0–38-V input range, adjustable 150–500-kHz switching frequency, and high-efficiency sleep mode (40 µA typical Iq). It integrates an internal N-channel high-side switch, power-good flag, soft-start, and forced PWM mode-designed for automotive telematics and in-dash instrumentation requiring stable 3.3-V or 5-V rail generation under light-load standby conditions.
For engineers reviewing the LM26003QMHX/NOPB datasheet, LM26003QMHX/NOPB pinout, LM26003QMHX/NOPB application, or LM26003QMHX/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (−40°C to +125°C), cycle-by-cycle current limit, VBIAS bypass capability for efficiency optimization, and thermal shutdown protection at 160°C junction temperature.
Technical Context
The LM26003QMHX/NOPB implements current-mode PWM control with internal slope compensation, enabling precise duty-cycle regulation via inductor current sensing and COMP-pin voltage comparison. Its architecture supports both continuous and discontinuous conduction modes, with automatic off-pulse skipping during low-VIN operation to maintain regulation down to 3.0 V.
Functional modes include sleep mode (40 µA Iq), forced PWM (disable sleep), synchronization (±20% to ±30% frequency tracking), and frequency foldback during short-circuit events (45 kHz min). The device uses a dedicated AVIN pin for analog supply decoupling and separate PGND/AGND paths to minimize noise coupling into the feedback loop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous load current with internal N-channel switch and cycle-by-cycle current limiting (3.15–6.05 A peak) |
| Input Voltage Range | 4.0 V to 38 V continuous; operates down to 3.0 V during transients without dropout |
| Switching Frequency | Adjustable 150–500 kHz via single resistor on FREQ pin; synchronizable to external clock |
| Quiescent Current | 40 µA typical in sleep mode (VBIAS = 5 V); 10.8 µA in shutdown |
| Feedback Accuracy | 1.236 V reference with ±1.5% tolerance over −40°C to +125°C |
| Protection Features | Thermal shutdown (160°C), UVLO (2.7–3.3 V threshold), frequency foldback, and soft-start control |
| Power Good Flag | Open-drain PGOOD with 92% VOUT threshold and 2–6% hysteresis |
Pinout & Package
LM26003QMHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed pad (EP) connected to GND for improved thermal performance. Pin count and layout match TI's standard LM26003 family footprint.
| 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 handling for 3-A output |
| AVIN (4) | Analog supply input | Dedicated low-noise input for internal bias circuitry; requires ≥100-nF ceramic bypass to PGND |
| PGOOD (5) | Open-drain status output | Asserts high when VOUT ≥ 92% of setpoint; enables system sequencing and fault detection |
| EN (6) | Enable control input | Analog-level enable: <0.8 V = shutdown; hysteresis ensures noise immunity during power-up |
| SS (7) | Soft-start timing node | 2.5-µA internal current charges external capacitor to control output ramp rate and limit inrush |
| COMP (8) | Error amplifier compensation | Connect RC network to stabilize loop response; transconductance = 675 µmho |
| FB (9) | Output voltage feedback | Resistor divider sets VOUT; 1.236 V reference with ±200 nA bias current minimizes divider error |
| AGND (10) | Analog ground reference | Separate ground for feedback and control circuitry to prevent switching noise injection |
| PGND (11) | Power ground return | Low-impedance path for high-current switch node return; must be tied to AGND at single point |
| FREQ (12) | Frequency programming | Resistor-to-GND sets nominal fSW; empirical formula RFREQ = (6.25×10¹⁰) × fSW−1.042 |
| FPWM (13) | Sleep mode disable | Logic-high input forces continuous PWM operation; eliminates light-load frequency variation |
| SYNC (14) | External clock input | Accepts 1.23-V min square wave; falling edge triggers switch-on; enables multi-rail synchronization |
| VBIAS (15) | Bias supply bypass | Connect to ≥3-V external source (e.g., VOUT) to reduce Iq and improve efficiency |
| VDD (16) | Internal LDO output | 5.99-V regulated supply for internal circuits; bypass with ≥1.0-µF capacitor to PGND |
| BOOT (17) | Bootstrap gate drive | 0.1-µF ceramic cap to SW generates high-side gate voltage; critical for MOSFET turn-on |
| SW (18,19,20) | Switch node outputs | Three parallel SW pins handle high di/dt currents and reduce parasitic inductance in PCB layout |
| EP | Exposed thermal pad | Mandatory GND connection for thermal dissipation; contributes to RθJA = 25.4°C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications across −40°C to +125°C junction temperature |
| High-efficiency sleep mode | 40 µA typical quiescent current enables >90% efficiency at 10-mA loads in battery-powered systems |
| VBIAS bypass capability | Reduces total input current by shifting bias supply from VIN to external ≥3-V rail (e.g., VOUT) |
| Adjustable soft-start | Programmable ramp time via SS capacitor prevents inrush current and output overshoot at startup |
| Integrated bootstrap diode | Eliminates need for external bootstrap diode, reducing BOM count and layout complexity |
| Frequency foldback protection | Reduces switching frequency to 45 kHz during short-circuit events to limit average switch current |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
Use Scenario: Powering GPS modules, cellular modems, and CAN interface ICs in vehicle infotainment head units. IC Role / Device Role / Timing Role: Primary 3.3-V/5-V DC-DC converter delivering regulated rail with low standby current and thermal robustness. Use Value: Sleep mode maintains <40 µA Iq during vehicle ignition-off, extending battery life without compromising wake-up responsiveness. | Use Scenario: Supplying display controllers, touch processors, and flash memory in embedded automotive navigation units. IC Role / Device Role / Timing Role: High-current buck regulator supporting dynamic load steps up to 2 A while maintaining tight output regulation. Use Value: Cycle-by-cycle current limit and 3.15-A minimum peak threshold ensure reliable operation during rapid processor load transitions. |
| In-Dash Instrumentation | Battery-Powered Applications |
Use Scenario: Generating 5-V rail for digital clusters with microcontrollers, sensors, and LED backlight drivers. IC Role / Device Role / Timing Role: Main power stage with PGOOD signaling for safe system boot and fault reporting to MCU. Use Value: Open-drain PGOOD with 92% threshold and 2–6% hysteresis enables precise power sequencing and undervoltage detection. | Use Scenario: Powering portable test equipment, handheld scanners, and industrial data loggers operating from 12-V lead-acid or Li-ion packs. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting full battery discharge range (10–38 V) with minimal quiescent loss. Use Value: 3.0-V minimum VIN operation and UVLO hysteresis prevent brownout resets during deep discharge cycles. |
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; AEC-Q100 Grade 1 certified with extended reliability testing and automotive-grade screening | Required for production automotive programs where qualification documentation and PPAP support are mandatory | Select LM26003Q1MHX/NOPB for Tier-1 automotive designs; LM26003QMHX/NOPB is suitable for non-automotive or pre-qualification prototyping |
| LM61480RQR | Higher 8-A output, 2.5–18-V input, 2.1-MHz fixed frequency, integrated MOSFETs, but no sleep mode or VBIAS bypass | Better suited for high-power, space-constrained applications needing higher current density and smaller inductors | Choose LM61480RQR when >3-A output or >1-MHz switching is required; LM26003QMHX/NOPB remains optimal for low-Iq and wide-VIN automotive standby rails |
Compared with LM26003Q1MHX/NOPB, the LM26003QMHX/NOPB lacks formal automotive qualification documentation but shares identical silicon and pinout-making it ideal for cost-sensitive or non-safety-critical designs. Versus LM61480RQR, it trades higher current and frequency for superior light-load efficiency and flexible bias architecture.
Availability
LM26003QMHX/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, in-dash instrumentation, and battery-powered applications requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM26003QMHX/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 technologies with over 50 years of innovation in high-reliability power conversion solutions.
The LM26003QMHX/NOPB belongs to TI's automotive-qualified buck regulator product line, engineered specifically for demanding 12-V and 24-V vehicle subsystems requiring low quiescent current, wide input range, and robust thermal performance.
FAQ
What is the maximum continuous output current supported by the LM26003QMHX/NOPB?
The LM26003QMHX/NOPB delivers up to 3 A of continuous output current using its internal N-channel high-side switch. This rating assumes proper thermal management-including PCB copper area, airflow, and use of the exposed pad-and operation within the recommended input voltage range (4.0–38 V). Peak current limit is specified from 3.15 A to 6.05 A depending on temperature, ensuring reliable overload protection for the LM26003QMHX/NOPB.
Does the LM26003QMHX/NOPB support synchronization to an external clock signal?
Yes, the LM26003QMHX/NOPB supports external frequency synchronization via the SYNC pin. It accepts a square-wave clock with ≥1.23-V peak amplitude and locks to the falling edge of the input signal. Synchronization range is ±20% below to +30% above the nominal frequency set by the FREQ resistor. For non-synchronized operation, the SYNC pin must be pulled low with a 10-kΩ resistor. This capability enables deterministic timing across multiple LM26003QMHX/NOPB regulators in complex power systems.
How does the VBIAS pin improve efficiency in the LM26003QMHX/NOPB?
The VBIAS pin allows the LM26003QMHX/NOPB to bypass its internal LDO and draw bias current from an external ≥3-V supply-such as the output rail-reducing total input current and improving system efficiency. When VBIAS = 5 V, sleep-mode Iq drops to 40 µA (typical), versus 76 µA when VBIAS = GND. This feature is especially valuable in intermediate-output applications (e.g., 3.3 V or 5 V) where powering the LM26003QMHX/NOPB's internal circuitry from VOUT avoids additional losses in the main power path.
What protection features are integrated into the LM26003QMHX/NOPB?
The LM26003QMHX/NOPB integrates thermal shutdown (160°C), input undervoltage lockout (UVLO with 2.7–3.3 V hysteresis), cycle-by-cycle current limiting, frequency foldback during short-circuit events (down to 45 kHz), and soft-start controlled ramp-up. It also includes a power-good flag (PGOOD) with 92% output threshold and 2–6% hysteresis for system monitoring. These protections operate independently of external components and are fully specified across −40°C to +125°C for the LM26003QMHX/NOPB.
Is the LM26003QMHX/NOPB pin-compatible with other devices in the LM26003 family?
Yes, the LM26003QMHX/NOPB is pin-compatible with the LM26003 and LM26003-Q1 variants in the same 20-pin HTSSOP package. All share identical pin functions, electrical characteristics, and thermal design requirements. The primary distinction is qualification level: LM26003QMHX/NOPB is the commercial-grade version, while LM26003Q1MHX/NOPB carries full AEC-Q100 Grade 1 certification. No PCB layout changes are needed when substituting within this family, including the LM26003QMHX/NOPB.
LM26003QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm 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):
- 3V
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 1.236V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM26003QMHX/NOPB FAQ
1.How can I place an order for LM26003QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26003QMHX/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 LM26003QMHX/NOPB reliable?
The price and inventory of LM26003QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26003QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26003QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26003QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26003QMHX/NOPB?
LM26003QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26003QMHX/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 LM26003QMHX/NOPB?
For technical support, including LM26003QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26003QMHX/NOPB requirements.
6.How does Aetrix verify that LM26003QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26003QMHX/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 LM26003QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26003QMHX/NOPB?
All LM26003QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26003QMHX/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 LM26003QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM26003QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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