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Texas Instruments LM26001MXA/NOPB
- Part No.:
- LM26001MXA/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001MXA/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,148
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Product details
Overview
LM26001MXA/NOPB from Texas Instruments is a 1.5-A synchronous step-down DC/DC converter with current-mode PWM control, 4.0–38-V input range, and high-efficiency sleep mode enabling <40 µA quiescent current under light load-designed for automotive telematics and battery-powered standby power systems.
For engineers reviewing the LM26001MXA/NOPB datasheet, LM26001MXA/NOPB pinout, LM26001MXA/NOPB application, or LM26001MXA/NOPB equivalent, key selection considerations include adjustable 150–500 kHz switching frequency, FPWM disable of sleep mode, Power Good flag, soft-start timing via external capacitor, and HTSSOP-16 exposed-pad thermal management.
Technical Context
The LM26001MXA/NOPB implements fixed-frequency current-mode PWM control with cycle-by-cycle peak current limiting and internal N-channel high-side switch. Its error amplifier features 670 µmho transconductance and COMP pin voltage range of 0.64–1.27 V, supporting Type II/III compensation networks.
Sleep mode activates when FB rises ≥1% above nominal and COMP falls to ~0.6 V, halting switching to reduce IQ to <40 µA; wake-up occurs at 92% FB threshold with 2% hysteresis. FPWM pin forces continuous PWM operation, disabling sleep while maintaining synchronization and soft-start functionality.
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 robustness in automotive 12-V and industrial 24-V rails. |
| Output Current | 1.5 A continuous; limited by internal 2.5-A peak current threshold-sufficient for powering microcontrollers, sensors, and communication ICs. |
| Quiescent Current | <40 µA in sleep mode (VBIAS = GND); 10 µA in shutdown-critical for battery-backed systems requiring multi-year standby life. |
| Feedback Accuracy | ±1.5% over –40°C to +125°C; 1.234 V nominal reference-ensures stable output regulation across automotive temperature extremes. |
| Switching Frequency | Adjustable 150–500 kHz via single resistor on FREQ pin; synchronizable to external clock-allows EMI optimization and noise-sensitive system coexistence. |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown (160°C), input UVLO (3.9 V startup / 2.9 V shutdown), short-circuit foldback-provides comprehensive fault resilience without external circuitry. |
| Package | HTSSOP-16 with exposed thermal pad-delivers 38.8°C/W junction-to-ambient thermal resistance for reliable 1.5-A operation without heatsink. |
Pinout & Package
LM26001MXA/NOPB uses the HTSSOP-16 (PWP) package with 5.00 mm × 4.40 mm body size and exposed thermal pad (EP) connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1, 2) | Power input supply | Dual VIN pins reduce trace inductance and improve high-current path integrity for stable 1.5-A operation. |
| PGOOD (3) | Open-drain status flag | Asserts high when VOUT ≥92% of setpoint-enables system-level power sequencing and fault detection. |
| EN (4) | Enable control input | Analog threshold (~1.2 V) with 120 mV hysteresis; sourcing 4.5 µA-supports direct connection to MCU GPIO or resistor-divider biasing. |
| SS (5) | Soft-start timing node | 2.2 µA internal current source charges external capacitor-controls ramp rate to prevent inrush and overshoot during startup. |
| COMP (6) | Loop compensation node | Connects to Type II/III RC network-sets phase margin and transient response for stable closed-loop regulation. |
| FB (7) | Output voltage feedback | 1.234 V reference with ±200 nA bias current-interfaces with resistor divider to set precise VOUT (e.g., 3.3 V or 5 V). |
| GND (8) | Power ground | Main return path for high-current SW node and low-noise analog circuits-requires solid plane connection beneath EP. |
| FREQ (9) | Frequency setting input | Resistor-to-GND sets fSW from 150–500 kHz-enables EMI tuning and efficiency optimization per application load profile. |
| FPWM (10) | Sleep mode disable | Logic-high disables sleep mode for constant-frequency operation-used where light-load ripple or frequency stability is critical. |
| SYNC (11) | External clock input | Accepts 1.2 V rising-edge trigger; ±20% sync range-allows multi-regulator synchronization to eliminate beat frequencies. |
| VBIAS (12) | Bias supply bypass | Connect to ≥3 V external rail to bypass internal LDO-reduces power loss and improves efficiency at high VIN/VOUT ratios. |
| VDD (13) | Internal LDO output | 6.0 V ±5% regulated supply; requires ≥1.0 µF ceramic bypass-powers gate driver and control logic independently of VIN. |
| BOOT (14) | High-side gate drive bootstrap | Connects 0.1 µF ceramic to SW-generates floating voltage for N-channel MOSFET gate drive without external diode. |
| SW (15, 16) | Switch node | Drives external inductor; dual pins reduce parasitic inductance-minimizes voltage spikes and EMI during 1.5-A switching transitions. |
| EP | Exposed thermal pad | Must be soldered to GND plane-accounts for >50% of total heat dissipation; essential for thermal reliability at full load. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces quiescent current to <40 µA at light load-extends battery life in always-on telematics and gateway applications. |
| Integrated bootstrap diode | Eliminates external bootstrap diode-reduces BOM count and PCB area while maintaining robust gate drive for internal N-FET. |
| Adjustable soft-start | Programmable ramp time via SS capacitor-prevents input inrush and output overshoot during cold start or enable sequencing. |
| Power Good flag | Open-drain PGOOD with 92% threshold and 2% hysteresis-provides deterministic system reset and power-good signaling to host processors. |
| Thermal shutdown protection | 160°C junction trip point with automatic recovery-ensures safe operation under overload or poor heatsinking conditions. |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
|
Use Scenario: Powering GPS modules, cellular modems, and CAN transceivers in vehicle infotainment head units. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V buck regulator supplying core logic and RF subsystems. Use Value: Sleep mode maintains <40 µA IQ during vehicle ignition-off state, enabling long-term location tracking without battery drain. |
Use Scenario: Regulating power for display controllers, touch processors, and inertial measurement units (IMUs) in dashboard navigation units. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter delivering stable 3.3-V rail from 12-V battery. Use Value: 150–500 kHz adjustable frequency avoids AM radio band interference while supporting compact 2.2-µH inductor selection. |
| In-Dash Instrumentation | Battery-Powered Standby Power |
|
Use Scenario: Supplying microcontroller, EEPROM, and real-time clock (RTC) in digital instrument clusters with wake-on-CAN capability. IC Role / Device Role / Timing Role: Always-on buck converter operating in sleep mode between vehicle key-off events. Use Value: 10 µA shutdown current and 92% PGOOD accuracy ensure reliable RTC backup and fast wake-up response. |
Use Scenario: Providing regulated 3.3-V standby power for home gateway SoCs during deep-sleep modes between data bursts. IC Role / Device Role / Timing Role: Low-IQ buck regulator maintaining system readiness while minimizing wall-adapter energy waste. Use Value: VBIAS bypass capability improves efficiency at 24-V input, reducing thermal load in enclosed consumer enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26003MHX/NOPB | Higher 3-A output current, wider 4–60-V input range, same HTSSOP-16 package and pinout. | Targets higher-power ADAS cameras or radar modules requiring >1.5 A sustained load. | Select when scaling output current beyond 1.5 A while retaining layout compatibility and sleep-mode architecture. |
| TPS54302DDAR | 3-A output, 4.5–28-V input, 500-kHz fixed frequency, no sleep mode-quiescent current 26 µA (not load-adaptive). | Preferred for cost-sensitive industrial PLCs where constant-frequency operation simplifies EMI filtering. | Choose when sleep mode is unnecessary and lower BOM cost outweighs adaptive efficiency benefits. |
Compared with LM26003MHX/NOPB, LM26001MXA/NOPB offers optimized thermal performance at 1.5-A load with identical footprint; versus TPS54302DDAR, it delivers superior light-load efficiency via sleep mode but lacks integrated MOSFET drivers for higher-current scalability.
Availability
LM26001MXA/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, and battery-powered standby power applications requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned design assurance.
Supply support for LM26001MXA/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 decades of automotive-grade product development expertise.
The LM26001MXA/NOPB belongs to TI's high-efficiency buck regulator product line, engineered specifically for automotive and industrial applications demanding ultra-low quiescent current, wide input voltage tolerance, and robust thermal performance.
FAQ
What is the minimum input voltage required for continuous operation of the LM26001MXA/NOPB?
The LM26001MXA/NOPB requires a minimum 4.0-V input for continuous operation within specification due to RDS(ON) increase below this level. However, it supports transient operation down to 3.0 V-useful for automotive cold-crank scenarios. Startup requires ≥3.9 V typical, verified across –40°C to +125°C junction temperature.
How does the sleep mode of the LM26001MXA/NOPB activate and what is its impact on output voltage ripple?
Sleep mode in the LM26001MXA/NOPB activates when FB rises ≥1% above nominal and COMP drops to ~0.6 V, halting switching to reduce IQ to <40 µA. The 1% FB hysteresis window limits output ripple to approximately ±1% of nominal VOUT-making it suitable for noise-sensitive analog and RF subsystems without additional post-regulation.
Can the LM26001MXA/NOPB be synchronized to an external clock, and what is the acceptable frequency deviation range?
Yes, the LM26001MXA/NOPB supports synchronization via the SYNC pin, accepting external clock signals with rising-edge thresholds of 1.2 V (typical). It operates within ±20% of the nominal switching frequency-e.g., if set to 300 kHz, sync range is 240–360 kHz-enabling reliable multi-rail coordination in complex power architectures.
What is the role of the VBIAS pin on the LM26001MXA/NOPB and how does it affect efficiency?
The VBIAS pin on the LM26001MXA/NOPB accepts an external ≥3-V supply to bypass the internal VDD LDO, reducing power loss and improving efficiency-especially beneficial at high VIN/VOUT ratios (e.g., 24-V input to 3.3-V output). When unused, VBIAS must be tied to GND; leaving it floating may cause instability.
Does the LM26001MXA/NOPB include overcurrent protection, and how does it behave during a short-circuit condition?
Yes, the LM26001MXA/NOPB features cycle-by-cycle peak current limiting with a typical 2.5-A threshold and short-circuit frequency foldback. During output short-circuit, FB falling below 0.87 V triggers foldback-reducing switching frequency to ~71 kHz (20% below nominal) to limit average switch current and thermal stress without latching off.
LM26001MXA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM26001MXA/NOPB FAQ
1.How can I place an order for LM26001MXA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001MXA/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 LM26001MXA/NOPB reliable?
The price and inventory of LM26001MXA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001MXA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26001MXA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001MXA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001MXA/NOPB?
LM26001MXA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001MXA/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 LM26001MXA/NOPB?
For technical support, including LM26001MXA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001MXA/NOPB requirements.
6.How does Aetrix verify that LM26001MXA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26001MXA/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 LM26001MXA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26001MXA/NOPB?
All LM26001MXA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26001MXA/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 LM26001MXA/NOPB part is unused and in its original packaging.
Return procedure for LM26001MXA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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