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Texas Instruments LM26001QMXA/NOPB
- Part No.:
- LM26001QMXA/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001QMXA/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
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Product details
Overview
LM26001QMXA/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, and high-efficiency sleep mode (≤40 µA Iq). It integrates an N-channel MOSFET switch, internal bootstrap diode, and power-good flag, and is used in automotive telematics and battery-powered industrial systems requiring stable 3.3-V or 5-V rail generation.
For engineers reviewing the LM26001QMXA/NOPB datasheet, LM26001QMXA/NOPB pinout, LM26001QMXA/NOPB application, or LM26001QMXA/NOPB equivalent, this page delivers verified technical context, HTSSOP-16 pin mapping, sleep/PWM mode behavior, thermal shutdown (160°C), and AEC-Q100 Grade 1 qualification - all confirmed from TI's SNVS430I datasheet and product folder.
Technical Context
The LM26001QMXA/NOPB implements fixed-frequency current-mode PWM control with cycle-by-cycle peak current limiting (1.85–3.2 A) and adjustable switching frequency (150–500 kHz via FREQ pin resistor). Its error amplifier features 670 µmho transconductance and COMP pin voltage range of 0.64–1.27 V, enabling stable loop compensation with external RC networks.
Sleep mode activates when FB rises ≥1% above nominal and COMP drops to ~0.6 V, halting switching to reduce Iq to <40 µA; wake-up occurs at FB = 92% of nominal. FPWM pin disables sleep mode for forced PWM operation, while SYNC supports external clock synchronization with ±20% frequency tracking range.
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 N-channel switch and cycle-by-cycle current limit - eliminates need for external sense resistor. |
| Quiescent Current | ≤40 µA in sleep mode (VBIAS = GND); 10 µA typical in shutdown - critical for always-on automotive modules. |
| Feedback Accuracy | ±1.5% over –40°C to +125°C; VFB = 1.234 V nominal - ensures precise output regulation across temperature and line/load variations. |
| Switching Frequency | Adjustable 150–500 kHz via single FREQ-to-GND resistor; synchronizable to external clock - allows EMI optimization and multi-rail coordination. |
| Protection Features | Thermal shutdown (160°C), input UVLO (3.6–4.2 V rising threshold), short-circuit foldback (71 kHz min), and PGOOD flag - enables robust system-level fault management. |
| Package | HTSSOP-16 with exposed pad (5.00 mm × 4.40 mm) - provides low θJA = 38.8°C/W for thermally constrained automotive PCBs. |
Pinout & Package
LM26001QMXA/NOPB uses the HTSSOP-16 package with exposed thermal pad (EP), which must be soldered to GND for optimal thermal performance and electrical stability.
| 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; requires local 1-µF ceramic bypass. |
| PGOOD (Pin 3) | Open-drain power-good flag | Asserts high when VOUT ≥92% of nominal; sinks 500 µA max with RDS(on) ≤64 Ω - enables system sequencing and fault detection. |
| EN (Pin 4) | Enable control input | Analog threshold (0.8 V low, 1.2 V typical high) with 120-mV hysteresis; sources 4.5 µA - supports direct microcontroller GPIO or resistor-divider control. |
| SS (Pin 5) | Soft-start timing node | 2.2-µA internal current source charges external capacitor; controls output ramp rate - prevents inrush current and overshoot at startup. |
| COMP (Pin 6) | Error amplifier compensation | Connects to RC network for loop stability; voltage range 0.64–1.27 V - defines bandwidth and phase margin of feedback control. |
| FB (Pin 7) | Output voltage feedback | Monitors resistive divider; reference = 1.234 V - sets VOUT = 1.234 × (1 + R1/R2); ±1.5% accuracy ensures tight regulation. |
| GND (Pin 8) | Power ground | Main return path for switch current and IC bias; connects to EP - forms low-impedance reference for all analog and power circuits. |
| FREQ (Pin 9) | Frequency setting | Resistor-to-GND sets fSW; 62 kΩ → 500 kHz, 240 kΩ → 150 kHz - enables EMI spread-spectrum tuning without external clock generator. |
| FPWM (Pin 10) | Forced PWM mode enable | Pull high (>1.2 V) to disable sleep mode; maintains fixed frequency under light load - trades efficiency for predictable ripple and timing. |
| SYNC (Pin 11) | External clock input | Accepts TTL/CMOS clock; hysteresis = 114 mV - synchronizes multiple regulators to avoid beat frequencies in multi-rail systems. |
| VBIAS (Pin 12) | Bias supply input | Accepts ≥3-V external supply to bypass internal LDO; reduces Iq by up to 50% - improves efficiency in systems with auxiliary 3.3-V/5-V rails. |
| VDD (Pin 13) | Internal LDO output | 5.95-V regulated output; requires ≥1.0-µF bypass - powers internal logic and gate driver; shuts down in EN = low state. |
| BOOT (Pin 14) | Bootstrap capacitor node | Connects 0.1-µF ceramic to SW; generates high-side gate drive voltage - enables integrated N-FET operation without external charge pump. |
| SW (Pins 15, 16) | Switch node | Drains internal N-FET; dual pins reduce parasitic inductance - minimizes voltage spikes and EMI during high-dI/dt transitions. |
| EP | Exposed thermal pad | Must be connected to GND plane - lowers junction-to-board thermal resistance to 16.7°C/W for reliable 1.5-A operation. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces Iq to ≤40 µA at light load while maintaining regulation - extends battery life in always-on automotive modules. |
| Integrated bootstrap diode | Eliminates external bootstrap diode; reduces BOM count and layout area - simplifies design of compact 1.5-A buck converters. |
| Adjustable soft-start | Programmable ramp time via SS capacitor; prevents inrush current and output overshoot - protects downstream loads during power-up. |
| AEC-Q100 Grade 1 qualified | Rated for –40°C to +125°C operating junction temperature - meets automotive reliability requirements for under-hood applications. |
| Power-good flag with hysteresis | PGOOD asserts at 92% VOUT, releases at 89–95% with 2–8% hysteresis - enables clean system reset and sequencing without external comparators. |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
|
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and CAN interface ICs in vehicle infotainment head units. IC Role / Device Role / Timing Role: Primary 5-V/3.3-V buck regulator supplying core logic and RF front-end circuitry. Use Value: Sleep mode cuts standby current below 40 µA, extending battery backup runtime during ignition-off periods. |
Use Scenario: Generating stable 3.3-V rail for display controllers, touch processors, and inertial measurement units (IMUs). IC Role / Device Role / Timing Role: High-accuracy voltage regulator with 1.5% VFB tolerance ensuring consistent sensor and display performance. Use Value: 4.0–38-V input range accommodates cold-crank (4.5 V) and load-dump (38 V) transients without external protection. |
| In-Dash Instrumentation | Battery-Powered Industrial Sensors |
|
Use Scenario: Supplying microcontrollers and analog front-ends in digital instrument clusters with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable buck converter coordinated with other power rails to minimize conducted emissions. Use Value: Adjustable 150–500 kHz frequency and FPWM mode allow EMI optimization across diverse board layouts. |
Use Scenario: Providing regulated 3.3-V output from Li-ion or 12-V lead-acid batteries in portable test equipment. IC Role / Device Role / Timing Role: Low-Iq buck regulator enabling multi-year operation on primary cells or small rechargeables. Use Value: 10 µA shutdown current and sleep-mode efficiency preserve battery capacity during extended idle intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26002QMXA/NOPB | Higher 2-A output current; identical pinout, package, and feature set - shares same HTSSOP-16 footprint and control interface. | Required where load exceeds 1.5 A or higher peak current margin is needed for transient response. | Select when future-proofing for higher current or designing across multiple platforms with shared layout. |
| TPS54302DDAR | 3-A rating, 3.5–28-V input, 15-µA shutdown Iq; different pinout (SOIC-8), no VBIAS or SYNC pins - not pin-compatible. | Suitable for non-automotive industrial applications where AEC-Q100 is not required and smaller package is preferred. | Choose for cost-sensitive, non-automotive designs needing higher current in SOIC-8; verify layout changes required. |
Compared with LM26002QMXA/NOPB, the LM26001QMXA/NOPB offers lower cost and thermal footprint for ≤1.5-A loads; versus TPS54302DDAR, it provides AEC-Q100 qualification, wider input range, and automotive-specific protections - but requires HTSSOP-16 layout space.
Availability
LM26001QMXA/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, and in-dash instrumentation requiring stable component supply with full AEC-Q100 compliance and long-term production continuity.
Supply support for LM26001QMXA/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 ICs, with decades of automotive-grade product development and manufacturing expertise.
The LM26001QMXA/NOPB belongs to TI's automotive-qualified buck regulator family, designed specifically for high-reliability 12-V battery-fed systems demanding wide input range, low quiescent current, and robust transient protection.
FAQ
What is the maximum continuous output current of the LM26001QMXA/NOPB?
The LM26001QMXA/NOPB delivers up to 1.5 A of continuous output current using its integrated N-channel MOSFET switch. This rating assumes proper thermal management via the exposed pad (EP) connected to GND and operation within the recommended ambient temperature range. Peak current limit is 1.85–3.2 A, but sustained output is specified at 1.5 A per the datasheet's Recommended Operating Conditions and thermal derating curves.
How does the sleep mode function in the LM26001QMXA/NOPB, and what triggers exit from it?
Sleep mode in the LM26001QMXA/NOPB activates automatically when load current drops low enough that FB rises ≥1% above nominal (e.g., >1.246 V for 1.234-V reference) and COMP falls to ~0.6 V. Switching stops, reducing Iq to ≤40 µA. Exit occurs when FB falls to the wake threshold - typically 92% of nominal output voltage - causing the regulator to resume PWM operation. This hysteresis limits output ripple to ~1%.
Can the LM26001QMXA/NOPB be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LM26001QMXA/NOPB supports external synchronization via the SYNC pin. It accepts TTL/CMOS-level clock signals and tracks within ±20% of the nominal switching frequency set by the FREQ resistor. For example, if configured for 300 kHz, SYNC can range from 240 kHz to 360 kHz. The SYNC pin must be pulled low for standalone operation, and its input hysteresis is 114 mV to reject noise.
What is the purpose of the VBIAS pin on the LM26001QMXA/NOPB, and how does it affect efficiency?
The VBIAS pin on the LM26001QMXA/NOPB accepts an external ≥3-V supply to power internal circuitry, bypassing the internal VDD LDO. When used, it reduces total quiescent current by up to 50% compared to VBIAS = GND - e.g., Iq_Sleep drops from 75 µA to 38 µA. This improves light-load efficiency in systems with available auxiliary 3.3-V or 5-V rails, such as automotive infotainment platforms.
Is the LM26001QMXA/NOPB pin-compatible with the standard LM26001 (non-Q1) variant?
Yes, the LM26001QMXA/NOPB is pin-compatible and footprint-compatible with the commercial-grade LM26001 (e.g., LM26001MXA/NOPB). Both use the HTSSOP-16 package with identical pinout, electrical characteristics, and functional behavior. The Q1 suffix denotes AEC-Q100 Grade 1 qualification (–40°C to +125°C), enhanced test screening, and automotive-specific documentation - no hardware or layout changes are needed for migration.
LM26001QMXA/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM26001QMXA/NOPB FAQ
1.How can I place an order for LM26001QMXA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001QMXA/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 LM26001QMXA/NOPB reliable?
The price and inventory of LM26001QMXA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001QMXA/NOPB is usually 5 days.
3.What payment methods are accepted for LM26001QMXA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001QMXA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001QMXA/NOPB?
LM26001QMXA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001QMXA/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 LM26001QMXA/NOPB?
For technical support, including LM26001QMXA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001QMXA/NOPB requirements.
6.How does Aetrix verify that LM26001QMXA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26001QMXA/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 LM26001QMXA/NOPB meets industry standards.
7.What is the process for return or replacement of LM26001QMXA/NOPB?
All LM26001QMXA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26001QMXA/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 LM26001QMXA/NOPB part is unused and in its original packaging.
Return procedure for LM26001QMXA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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