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Texas Instruments LM26001MXAX
- Part No.:
- LM26001MXAX
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001MXAX.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LM26001MXAX 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, 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 battery-powered systems requiring low-light-load quiescent current.
For engineers reviewing the LM26001MXAX datasheet, LM26001MXAX pinout, LM26001MXAX application, or LM26001MXAX equivalent, key selection considerations include its HTSSOP-16 exposed-pad package, FPWM disable of sleep mode, cycle-by-cycle current limiting, 1.5% reference accuracy, and compatibility with external synchronization up to ±30% frequency deviation.
Technical Context
The LM26001MXAX employs peak-current-mode control with internal ramp compensation, enabling stable regulation across wide line/load variations and simplified loop compensation via the COMP pin. Its sleep mode activates when FB rises ≥1% above nominal and COMP falls to ~0.6 V, halting switching while maintaining output regulation via charge retention in output capacitance.
Functional modes are determined by analog-level EN (1.2 V threshold), digital FPWM (disables sleep), and SYNC (synchronizes to external clock with ±20% down / +30% up tolerance). The device features built-in UVLO (3.9 V startup, 2.9 V shutdown), thermal shutdown at 160°C, and short-circuit protection via frequency foldback below 0.87 V on FB.
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; limited by internal 2.5-A peak current threshold-supports typical 3.3 V/5 V point-of-load conversion with margin. |
| Quiescent Current | ≤40 µA in sleep mode (VBIAS = GND); 10 µA in shutdown-minimizes standby power loss in always-on automotive modules. |
| Reference Accuracy | ±1.5% over –40°C to +125°C-ensures tight output voltage regulation without external trimming in navigation or instrumentation systems. |
| Switching Frequency | Adjustable 150–500 kHz via resistor on FREQ pin; synchronizable to external clock-allows EMI optimization and noise avoidance in sensitive RF subsystems. |
| Power-Good Flag | Open-drain PGOOD asserts high when VOUT ≥ 92% of setpoint-provides reliable system reset signaling for microcontrollers and FPGAs. |
| Thermal Protection | Thermal shutdown at 160°C with automatic recovery-prevents latch-up during overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
LM26001MXAX is housed in a thermally enhanced HTSSOP-16 package (5.00 mm × 4.40 mm) with exposed pad (EP) soldered to PCB ground for optimal thermal performance (θJA = 38.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2) | Power input supply | Dual VIN pins reduce trace resistance and improve high-current path integrity; requires local 1-µF ceramic bypass. |
| PGOOD (Pin 3) | Open-drain status output | Signals valid regulation; must be pulled up externally-used for sequencing or fault detection in multi-rail systems. |
| EN (Pin 4) | Enable control input | Analog threshold (1.2 V typ.) with 120 mV hysteresis-supports direct MCU GPIO control or RC delay for power-up sequencing. |
| 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-determines phase margin and transient response in closed-loop operation. |
| FB (Pin 7) | Feedback voltage sense | Monitors resistive divider from VOUT; sets output via 1.234 V internal reference-enables adjustable or fixed-output configurations. |
| GND (Pin 8) | Signal and power ground | Primary return path for control circuitry; must be connected to EP and power ground plane with low-inductance layout. |
| FREQ (Pin 9) | Frequency setting input | Resistor-to-ground sets fSW (150–500 kHz)-allows tuning for efficiency vs. size trade-offs in compact designs. |
| FPWM (Pin 10) | Sleep mode disable | Logic-high forces continuous PWM operation-used when constant frequency is required for EMI compliance or audio-sensitive loads. |
| SYNC (Pin 11) | External clock input | Accepts TTL/CMOS clock; enables synchronized switching across multiple regulators-reduces beat frequencies in multi-phase supplies. |
| VBIAS (Pin 12) | Bias supply input | Optional ≥3 V external supply bypasses internal LDO-improves efficiency at light loads and reduces self-heating. |
| VDD (Pin 13) | Internal regulator output | 5.95 V (typ.) output; powers gate driver and logic-requires ≥1.0 µF ceramic capacitor to GND for stability. |
| BOOT (Pin 14) | Bootstrap capacitor node | Connects to SW via 0.1-µF ceramic-generates high-side gate drive voltage above SW potential for N-FET operation. |
| SW (Pins 15, 16) | Switch node | Drains internal N-channel FET; connects to inductor and catch diode-high dv/dt node requiring tight layout and ground shielding. |
| EP | Exposed thermal pad | Must be soldered to solid GND plane-accounts for >75% of total heat dissipation; critical for 1.5-A continuous operation. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces IQ to ≤40 µA under light load-extends battery life in always-on telematics gateways without sacrificing regulation accuracy. |
| Integrated bootstrap diode | Eliminates external diode-reduces BOM count and board area in space-constrained automotive modules. |
| Cycle-by-cycle current limit | Monitors peak inductor current directly-provides robust short-circuit protection without external sensing resistors. |
| Adjustable soft-start | Programmable ramp time via SS capacitor-prevents inrush current damage to input capacitors and downstream ICs. |
| Power-good flag with hysteresis | 92% turn-on / 89% turn-off threshold-avoids chatter during marginal output conditions and ensures clean system reset. |
| Thermal shutdown with auto-recovery | 160°C trip point with hysteresis-protects against sustained overload while allowing graceful resumption after cooling. |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and CAN transceivers in vehicle infotainment head units. IC Role / Device Role / Timing Role: Primary 5-V/3.3-V buck regulator delivering regulated power with low-noise switching and fast load transient response. Use Value: Sleep mode maintains <40 µA IQ during vehicle ignition-off, preserving battery charge for remote wake-up and location tracking. |
Use Scenario: Supplying display controllers, touch processors, and flash memory in in-dash navigation displays. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating from 9–16 V automotive battery with input transient tolerance down to 3 V. Use Value: Adjustable frequency avoids interference with display pixel clock harmonics; PGOOD enables safe boot sequencing. |
| In-Dash Instrumentation | Battery-Powered Applications |
Use Scenario: Powering digital instrument cluster MCUs, LED drivers, and sensor interfaces in modern gauge clusters. IC Role / Device Role / Timing Role: Main power supply with forced PWM mode enabled to ensure constant switching frequency for EMI filtering. Use Value: FPWM disables sleep mode, eliminating low-frequency ripple that could interfere with analog sensor signal chains. |
Use Scenario: Providing regulated 3.3 V for portable diagnostic tools, handheld scanners, and wireless OBD-II adapters. IC Role / Device Role / Timing Role: Standby-power optimized buck converter supporting long shelf life and rapid wake-up from deep sleep. Use Value: 10 µA shutdown current and 40 µA sleep current enable multi-year battery operation in intermittent-use devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26002QMHX/NOPB | Higher 2-A output current; identical 4–38 V input range and sleep mode architecture; HTSSOP-16 pin-compatible but larger RDS(on) (0.15 Ω vs. 0.2 Ω). | Preferred for higher-load applications like ADAS camera modules where >1.5 A is required. | Select LM26002QMHX/NOPB when output current margin or lower conduction loss is critical; verify thermal design for same footprint. |
| TPS54302DDCR | Lower 3–28 V input range; 3-A rating; no dedicated sleep mode-uses pulse-skipping in light load; 10-µA shutdown only. | Suitable for industrial non-automotive applications where extended input range is not needed and EMI is less constrained. | Choose TPS54302DDCR for cost-sensitive, non-automotive designs requiring higher current but tolerating higher light-load IQ. |
Compared with LM26002QMHX/NOPB and TPS54302DDCR, the LM26001MXAX offers superior light-load efficiency via dedicated sleep mode and wider input voltage support-making it optimal for automotive battery-supplied systems where standby power and transient resilience are critical.
Availability
LM26001MXAX is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, and battery-powered instrumentation requiring stable component supply, AEC-Q100-compliant sourcing, and long-term lifecycle assurance.
Supply support for LM26001MXAX 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 and manufacturing excellence.
The LM26001MXAX belongs to TI's high-voltage buck regulator product line, engineered specifically for automotive and industrial applications demanding wide-input-range operation, ultra-low quiescent current, and robust protection features under harsh electrical environments.
FAQ
What is the minimum input voltage required for continuous operation of the LM26001MXAX?
The LM26001MXAX requires a minimum 4.0-V input for continuous operation within specification due to increased RDS(on) losses below this level. However, it supports transient operation down to 3.0 V-enabling reliable function during cold-crank events in automotive systems. Startup requires ≥3.9 V (typical) on VIN to activate the internal VDD regulator and initiate soft-start.
How does the sleep mode of the LM26001MXAX differ from standard pulse-skipping mode?
The LM26001MXAX sleep mode fully halts switching and reduces IQ to ≤40 µA by clamping COMP at ~0.6 V and disabling the oscillator-unlike pulse-skipping, which maintains switching at reduced duty cycle. This results in significantly lower light-load power loss and eliminates low-frequency output ripple, making LM26001MXAX ideal for always-on automotive modules.
Can the LM26001MXAX be synchronized to an external clock, and what is the allowable frequency deviation?
Yes, the LM26001MXAX supports external synchronization via the SYNC pin. It accepts TTL/CMOS clock signals and locks to frequencies within ±20% below or +30% above the nominal set frequency (e.g., 300 kHz ±60 kHz down / +90 kHz up). SYNC must be pulled low for free-running operation.
What is the purpose of the VBIAS pin on the LM26001MXAX, and how does it affect efficiency?
The VBIAS pin allows connection of an external ≥3-V supply to bypass the internal VDD LDO. When used, VBIAS reduces power dissipation in the internal regulator-lowering IQ in sleep mode from 75 µA (VBIAS = GND) to 38 µA (VBIAS = 5 V) and improving full-load efficiency by ~1–2% in high-input-voltage applications.
Does the LM26001MXAX require an external bootstrap diode, and why or why not?
No, the LM26001MXAX integrates a bootstrap diode internally-eliminating the need for an external component. This simplifies layout, reduces BOM count, and improves reliability in automotive environments. The BOOT pin still requires a 0.1-µF ceramic capacitor to SW to generate the gate-drive voltage for the high-side N-FET.
LM26001MXAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM26001MXAX FAQ
1.How can I place an order for LM26001MXAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001MXAX 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 LM26001MXAX reliable?
The price and inventory of LM26001MXAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001MXAX is usually 5 days.
3.What payment methods are accepted for LM26001MXAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001MXAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001MXAX?
LM26001MXAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001MXAX 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 LM26001MXAX?
For technical support, including LM26001MXAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001MXAX requirements.
6.How does Aetrix verify that LM26001MXAX is sourced from the original manufacturer or authorized distributors?
All LM26001MXAX 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 LM26001MXAX meets industry standards.
7.What is the process for return or replacement of LM26001MXAX?
All LM26001MXAX units undergo pre-shipment inspection (PSI). If there is an issue with LM26001MXAX, 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 LM26001MXAX part is unused and in its original packaging.
Return procedure for LM26001MXAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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