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Texas Instruments LM26001QMXAX/NOPB
- Part No.:
- LM26001QMXAX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001QMXAX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:896
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Product details
Overview
LM26001QMXAX/NOPB from Texas Instruments is a 1.5-A synchronous buck DC/DC regulator with current-mode PWM control, 4.0–38-V input range, adjustable 150–500-kHz switching frequency, and high-efficiency sleep mode (≤40 µA Iq). It integrates an N-channel high-side switch, internal bootstrap diode, and power-good flag-designed for automotive telematics and in-dash instrumentation requiring stable low-load efficiency.
For engineers reviewing the LM26001QMXAX/NOPB datasheet, LM26001QMXAX/NOPB pinout, LM26001QMXAX/NOPB application, or LM26001QMXAX/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), cycle-by-cycle current limiting, FPWM disable of sleep mode, and HTSSOP-16 exposed-pad thermal performance.
Technical Context
The LM26001QMXAX/NOPB implements current-mode control with internal ramp compensation, enabling precise duty-cycle regulation via COMP pin voltage comparison against sensed inductor current. Its sleep mode activates when FB rises ≥1% above nominal and COMP drops to ~0.6 V, halting switching until FB falls to the wake threshold-yielding ≤1% output ripple during light-load operation.
FPWM mode disables sleep mode by pulling the FPWM pin high, forcing continuous PWM operation with DCM at light loads and CCM at nominal loads. Synchronization is supported via the SYNC pin (1.2-V rising threshold, ±114-mV hysteresis), and frequency is set externally via resistor on FREQ (150–500 kHz range, ±10% tolerance).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 38 V continuous; supports 3.0-V transient operation during line dips-enables direct connection to automotive battery rails. |
| Output Current | 1.5-A continuous load capability with internal 2.5-A peak current limit (1.85–3.2 A over temperature)-sufficient for powering microcontrollers and sensors in infotainment systems. |
| Quiescent Current | ≤40 µA in sleep mode (VBIAS = GND); 10 µA typical in shutdown-critical for always-on automotive modules with strict standby power budgets. |
| Feedback Accuracy | ±1.5% reference voltage (1.234 V nominal, 1.2155–1.2525 V over –40°C to +125°C)-ensures tight output regulation across automotive temperature extremes. |
| Switch RDS(on) | 0.12–0.42 Ω over temperature-minimizes conduction loss and thermal rise in compact HTSSOP-16 layout. |
| Power Good Flag | Open-drain PGOOD asserts high when VOUT ≥92% of nominal (89–95% over temp); 64-Ω on-resistance enables direct MCU interrupt signaling. |
| Thermal Protection | 160°C thermal shutdown with automatic recovery-prevents latch-up during sustained overload or poor heatsinking in enclosed dash environments. |
Pinout & Package
LM26001QMXAX/NOPB uses the HTSSOP-16 package with 5.00 mm × 4.40 mm body size and exposed thermal pad (EP) connected to GND for enhanced heat dissipation in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2) | Power supply input | Dual VIN pins reduce trace resistance and improve high-current path integrity for 1.5-A operation. |
| PGOOD (Pin 3) | Open-drain status output | Signals valid VOUT to host MCU; requires external pull-up for logic-level compatibility. |
| EN (Pin 4) | Enable control input | Analog threshold (0.8 V max for shutdown, 1.2 V typical active); 4.5-µA internal pull-up allows direct VIN tie for always-on use. |
| SS (Pin 5) | Soft-start timing node | 2.2-µA internal current source charges external capacitor-sets controlled VOUT ramp time to prevent inrush and overshoot. |
| COMP (Pin 6) | Error amplifier compensation | Connects to RC network for loop stability; voltage clamped at 0.64–1.27 V-defines sleep/wake thresholds and transient response. |
| FB (Pin 7) | Output voltage feedback | Resistor divider input referenced to 1.234-V internal bandgap-sets VOUT with ±1.5% accuracy over full temperature range. |
| GND (Pin 8) | Power ground | Primary return path for high-current SW node and internal LDO-must be tied to EP for optimal thermal and EMI performance. |
| FREQ (Pin 9) | Frequency setting | Resistor-to-GND sets fSW from 150–500 kHz; enables optimization of efficiency vs. size trade-offs in space-constrained designs. |
| FPWM (Pin 10) | Sleep mode disable | Logic-high input forces continuous PWM operation-eliminates frequency variation but increases light-load Iq to 150–230 µA. |
| SYNC (Pin 11) | External clock synchronization | Accepts 1.2-V CMOS clock input; ±20% sync range allows jitter-tolerant multi-regulator coordination in complex ECUs. |
| VBIAS (Pin 12) | Bias supply bypass | Connect to ≥3-V external rail to bypass internal VDD LDO-reduces power loss and improves efficiency at high input voltages. |
| VDD (Pin 13) | Internal LDO output | 5.5–6.5-V regulated supply for gate drive and logic; requires ≥1.0-µF ceramic bypass capacitor close to pin. |
| BOOT (Pin 14) | Bootstrap capacitor node | Connects 0.1-µF ceramic cap to SW-generates high-side gate drive voltage without external charge pump. |
| SW (Pins 15, 16) | Switch node | Drain of internal N-channel MOSFET; dual pins reduce parasitic inductance and improve EMI in high-dI/dt switching paths. |
| EP | Exposed thermal pad | Must be soldered to GND plane-lowers θJA to 38.8°C/W and enables 2.6-W power dissipation at 25°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces Iq to ≤40 µA under light load while maintaining regulation-extends battery life in always-on automotive modules. |
| Integrated bootstrap diode | Eliminates external diode requirement in buck topology-reduces BOM count and PCB area in cost-sensitive telematics designs. |
| Cycle-by-cycle current limiting | Monitors peak inductor current directly through internal switch-provides fast overcurrent protection without sense resistor losses. |
| Adjustable soft-start | Programmable ramp time via SS capacitor-prevents inrush current damage to input capacitors and avoids output overshoot during cold start. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation-meets reliability requirements for engine bay and dashboard electronics. |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
|
Use Scenario: Powering GPS/GNSS receivers and cellular modems in vehicle tracking units with intermittent data transmission. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V buck regulator delivering 1.5-A peak current during modem burst transmission. Use Value: Sleep mode reduces system standby current to <40 µA-enabling >1-year battery life in disconnected tracking devices. |
Use Scenario: Supplying display controllers and map storage in embedded in-vehicle navigation head units. IC Role / Device Role / Timing Role: Main DC/DC converter regulating 3.3-V logic rail from 12-V battery, synchronized to system clock via SYNC pin. Use Value: 150–500-kHz adjustable frequency avoids AM radio band interference while optimizing inductor size for compact dash integration. |
| In-Dash Instrumentation | Battery-Powered Applications |
|
Use Scenario: Providing stable 5-V supply to digital instrument cluster MCUs and CAN transceivers in modern vehicle dashboards. IC Role / Device Role / Timing Role: High-reliability power stage with PGOOD monitoring and thermal shutdown-ensuring fail-safe operation during extended hot-cranking events. Use Value: AEC-Q100 Grade 1 rating and 160°C thermal shutdown guarantee uninterrupted operation across automotive temperature extremes. |
Use Scenario: Powering portable diagnostic tools and OBD-II scanners powered by rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Wide-input buck regulator accepting 3.0–38-V input-supports both battery (3.0–4.2 V) and vehicle ignition (12–24 V) operation without reconfiguration. Use Value: 3.0-V minimum input enables startup during deep battery discharge, while FPWM mode ensures stable frequency during variable load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26002QMXAX/NOPB | Higher 2.5-A output current, identical pinout and feature set, same AEC-Q100 Grade 1 rating. | Required where peak load exceeds 1.5 A (e.g., multi-sensor fusion modules). | Select when higher current headroom is needed without redesigning layout or firmware. |
| TPS54302DDAR | 3-A output, 4.5–28-V input, 150–2500-kHz frequency, no integrated bootstrap diode, non-automotive grade. | Suitable for industrial or consumer applications where AEC-Q100 is not required and higher frequency is acceptable. | Choose for cost-sensitive non-automotive designs needing higher current and wider frequency range-but verify external diode and thermal design. |
Compared with LM26001QMXAX/NOPB, LM26002QMXAX/NOPB offers +1-A current headroom in identical footprint, while TPS54302DDAR trades automotive qualification for broader frequency tuning and higher current-requiring external bootstrap diode and careful thermal validation.
Availability
LM26001QMXAX/NOPB is available at Aetrix Electronics and suitable for automotive telematics, in-dash instrumentation, and battery-powered diagnostic tools requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM26001QMXAX/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 and embedded processing technologies, with decades of automotive-grade power management innovation.
The LM26001QMXAX/NOPB belongs to TI's automotive-qualified buck regulator product line, engineered specifically for high-reliability, low-quiescent-current power conversion in safety-critical vehicle subsystems.
FAQ
What is the operating temperature range for the LM26001QMXAX/NOPB?
The LM26001QMXAX/NOPB is qualified per AEC-Q100 Grade 1, supporting continuous operation from –40°C to +125°C junction temperature. This rating is validated across all electrical parameters-including feedback accuracy (±1.5%), quiescent current (≤40 µA sleep), and thermal shutdown (160°C)-making it suitable for under-hood and dashboard applications where ambient temperatures exceed 85°C.
Does the LM26001QMXAX/NOPB require an external bootstrap diode?
No, the LM26001QMXAX/NOPB integrates a bootstrap diode internally. The BOOT pin connects directly to a 0.1-µF ceramic capacitor between BOOT and SW-eliminating the need for an external diode and reducing component count, PCB area, and potential failure points in automotive power supplies.
How does the sleep mode function in the LM26001QMXAX/NOPB?
Sleep mode in the LM26001QMXAX/NOPB activates automatically when load current drops below a threshold defined by FB rising ≥1% above nominal and COMP falling to ~0.6 V. Switching halts, reducing Iq to ≤40 µA. It resumes when FB falls to the wake threshold-limiting output ripple to ≤1% and extending battery life in always-on automotive modules.
Can the LM26001QMXAX/NOPB be synchronized to an external clock?
Yes, the LM26001QMXAX/NOPB supports external synchronization via the SYNC pin, which accepts a CMOS clock signal with 1.2-V rising threshold and ±114-mV hysteresis. Frequency can be locked within ±20% of nominal setting-enabling noise-sensitive applications like infotainment audio subsystems to avoid beat frequencies.
What is the purpose of the VBIAS pin on the LM26001QMXAX/NOPB?
The VBIAS pin on the LM26001QMXAX/NOPB allows connection to an external ≥3-V supply to bypass the internal VDD LDO. This reduces power loss and improves efficiency-especially at high input voltages (>24 V)-by eliminating LDO dropout and associated heat generation in thermally constrained automotive PCBs.
LM26001QMXAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-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):
- 1.234V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 1.5A
- 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:
- 16-HTSSOP
LM26001QMXAX/NOPB FAQ
1.How can I place an order for LM26001QMXAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001QMXAX/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 LM26001QMXAX/NOPB reliable?
The price and inventory of LM26001QMXAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001QMXAX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26001QMXAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001QMXAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001QMXAX/NOPB?
LM26001QMXAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001QMXAX/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 LM26001QMXAX/NOPB?
For technical support, including LM26001QMXAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001QMXAX/NOPB requirements.
6.How does Aetrix verify that LM26001QMXAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26001QMXAX/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 LM26001QMXAX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26001QMXAX/NOPB?
All LM26001QMXAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26001QMXAX/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 LM26001QMXAX/NOPB part is unused and in its original packaging.
Return procedure for LM26001QMXAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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