My Inquiry
My Account
Texas Instruments LM26001MXA
- Part No.:
- LM26001MXA
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001MXA.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,603
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM26001MXA from Texas Instruments is a 1.5-A synchronous buck switching regulator with current-mode control, 4.0–38-V input range, and high-efficiency sleep mode delivering <40 µA quiescent current. It integrates an N-channel MOSFET switch, internal bootstrap diode, and adjustable 150–500 kHz switching frequency-designed for automotive telematics and battery-powered standby power systems requiring low-light-load power loss.
For engineers reviewing the LM26001MXA datasheet, LM26001MXA pinout, LM26001MXA application, or LM26001MXA equivalent, key selection criteria include its 1.234 V feedback reference accuracy, cycle-by-cycle current limiting, FPWM disable of sleep mode, Power Good flag, and HTSSOP-16 exposed-pad thermal performance in automotive-grade environments.
Technical Context
The LM26001MXA implements fixed-frequency current-mode PWM control with internal slope compensation, enabling stable regulation across wide VIN (4.0–38 V) and VOUT ranges while supporting discontinuous conduction mode (DCM) in FPWM mode. Its error amplifier features 670 µmho transconductance and COMP pin voltage range of 0.64–1.27 V for loop stability with standard Type II/III compensation networks.
Sleep mode activation occurs when FB rises to 101.2% of nominal and COMP falls to ~0.6 V, reducing switching activity and holding IQ <40 µA; wake-up triggers at 92% FB threshold with 2% hysteresis. Thermal shutdown activates at 160°C, and UVLO has asymmetric thresholds (3.6–4.2 V rising, 2.6–3.2 V falling) for robust line transient immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 38 V continuous; supports 3.0 V transient operation without shutdown |
| Output Current | 1.5 A continuous; peak current limit 1.85–3.2 A over temperature |
| Feedback Reference | 1.234 V ±1.5% (–40°C to +125°C); enables precise output voltage setting via resistor divider |
| Quiescent Current | 38 µA typical in sleep mode with VBIAS = 5 V; 10.8 µA in shutdown |
| Switching Frequency | Adjustable 150–500 kHz via single FREQ resistor; synchronizable to external clock |
| Power Good Threshold | 92% of nominal VOUT with 2% hysteresis; open-drain PGOOD output signals regulation status |
| Thermal Protection | 160°C junction thermal shutdown; θJA = 38.8°C/W (HTSSOP-16 EP package) |
Pinout & Package
LM26001MXA is housed in a thermally enhanced HTSSOP-16 package (5.00 mm × 4.40 mm) with exposed pad (EP) tied to GND for optimal thermal dissipation. Pin 1 is VIN (top-left corner, marked dot), and pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Power supply input | Dual high-current input pins reduce trace resistance and improve thermal path for 4–38 V supply |
| PGOOD (3) | Open-drain status output | Asserts high when VOUT ≥92% of setpoint; requires external pull-up for logic-level interface |
| EN (4) | Enable control input | Analog threshold (0.8 V low, 1.2 V high) with 120 mV hysteresis; 4.5 µA internal pull-up allows floating-for-enable |
| SS (5) | Soft-start timing node | 2.2 µA internal current source charges external capacitor to control VOUT ramp rate and limit inrush |
| COMP (6) | Loop compensation node | Connects to RC network for Type II/III compensation; 0.64–1.27 V operating range ensures stability |
| FB (7) | Feedback input | Monitors resistor-divider output; 1.234 V reference sets VOUT = 1.234 × (1 + R1/R2) |
| GND (8) | Signal and power ground | Primary return path for control circuitry; connects to EP for thermal and EMI integrity |
| FREQ (9) | Frequency adjust | Resistor-to-GND sets fSW from 150–500 kHz; tolerance directly impacts timing accuracy |
| FPWM (10) | Sleep mode disable | Logic-high (>1.2 V) forces continuous PWM operation; eliminates light-load frequency variation |
| SYNC (11) | External clock input | Accepts TTL/CMOS clock; locks fSW to external source with ±20% sync range |
| VBIAS (12) | Bias supply input | ≥3 V external supply bypasses internal LDO, improving efficiency at high VIN or light loads |
| VDD (13) | Internal LDO output | 6.0 V ±5% regulated supply for gate driver and logic; requires ≥1.0 µF ceramic bypass |
| BOOT (14) | Bootstrap capacitor node | Connects 0.1 µF ceramic to SW to generate high-side gate drive voltage above VIN |
| SW (15,16) | Switch node | Drains internal N-FET; dual pins reduce inductance and thermal stress during 1.5 A switching |
| EP | Exposed thermal pad | Mandatory GND connection; primary thermal path to PCB heatsink layer |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces IQ to <40 µA under light load while maintaining regulation via FB/COMP hysteresis control |
| Integrated bootstrap diode | Eliminates external diode requirement, simplifying layout and reducing BOM count in buck topology |
| Cycle-by-cycle current limit | Direct inductor current sensing enables fast overcurrent protection without external sense resistor |
| Adjustable soft-start | Programmable ramp time via SS capacitor prevents inrush current and output overshoot at startup |
| Power Good flag with hysteresis | Provides reliable system-level power sequencing signal with 2% window to reject noise-induced glitches |
| Thermal shutdown & UVLO | 160°C TSD and asymmetric 3.6–4.2 V / 2.6–3.2 V UVLO thresholds ensure robust operation in automotive transients |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
Use Scenario: Power management for GPS/GSM modules in vehicle infotainment head units with strict 12 V battery input and standby current budgets. IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck converter supplying microcontroller, RF front-end, and memory subsystems. Use Value: Sleep mode reduces quiescent current to <40 µA, extending battery life during ignition-off periods without compromising wake-up responsiveness. |
Use Scenario: Compact DC-DC conversion in portable navigation devices powered by Li-ion batteries (8–16 V input range). IC Role / Device Role / Timing Role: Synchronous step-down regulator delivering regulated 3.3 V to display controller and GNSS receiver ICs. Use Value: 150–500 kHz adjustable frequency avoids AM radio band interference while enabling small external inductors (<2.2 µH). |
| In-Dash Instrumentation | Battery-Powered Standby Power |
Use Scenario: Powering digital instrument cluster microcontrollers and CAN transceivers in modern automotive dashboards. IC Role / Device Role / Timing Role: Main 5 V rail generator with Power Good signaling for safe MCU boot sequencing and fault detection. Use Value: PGOOD flag with 92% threshold and 2% hysteresis ensures reliable reset assertion before firmware execution begins. |
Use Scenario: Always-on auxiliary supply for home gateway set-top boxes requiring <50 µA standby consumption. IC Role / Device Role / Timing Role: Low-IQ buck regulator converting 12 V wall adapter to 3.3 V for real-time clock and wake-on-LAN circuitry. Use Value: 10.8 µA shutdown current and <40 µA sleep current meet Energy Star and EU CoC Tier 2 standby power requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26002MXA | Higher 2.5-A output current, identical pinout and feature set; 0.12 Ω RDS(ON) vs 0.2 Ω | Required for >1.5 A loads or lower dropout at high temperature | Select LM26002MXA when peak load exceeds 1.5 A or thermal margin is constrained |
| TPS54202HDDCR | 2-A output, 4.5–17-V input, 500-kHz fixed frequency, no sleep mode; smaller 8-pin SOIC package | Lacks sleep mode and wide VIN range; suited for cost-sensitive industrial supplies | Choose TPS54202HDDCR only if input is strictly 5–15 V and sleep mode is unnecessary |
Compared with LM26002MXA and TPS54202HDDCR, the LM26001MXA uniquely balances wide 4–38 V input, sub-40 µA sleep IQ, and automotive-grade thermal robustness in HTSSOP-16-making it optimal for battery-backed and automotive 12/24 V systems where light-load efficiency and transient resilience are critical.
Availability
LM26001MXA is available at Aetrix Electronics and suitable for automotive telematics, in-dash instrumentation, and battery-powered standby power applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM26001MXA 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 qualification expertise and broad distribution infrastructure.
The LM26001MXA belongs to TI's high-voltage buck regulator product line, engineered specifically for automotive and industrial applications demanding wide-input-range DC-DC conversion with ultra-low standby power and robust thermal performance.
FAQ
What is the minimum input voltage required for continuous operation of the LM26001MXA?
The LM26001MXA requires a minimum 4.0 V input for continuous operation within specification due to increased RDS(ON) losses below this level. However, it can tolerate input transients as low as 3.0 V without shutdown, enabling robust performance during cold-crank automotive events. Startup requires ≥3.9 V typical, verified across –40°C to +125°C junction temperature.
How does the LM26001MXA enter and exit sleep mode?
The LM26001MXA enters sleep mode when FB rises to 101.2% of nominal output and COMP falls to ~0.6 V, halting switching to reduce IQ to <40 µA. It exits sleep mode when FB drops to 92% of nominal (PGOOD threshold), resuming PWM regulation. This 2% hysteresis window limits output ripple to ~1% of VOUT and prevents oscillation near light-load boundaries.
Can the LM26001MXA be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LM26001MXA supports synchronization via the SYNC pin. When driven with a TTL/CMOS clock, it locks to frequencies within ±20% of its nominal switching frequency (e.g., 240–360 kHz for a 300 kHz setting). SYNC must be pulled low for free-running operation. The device accepts external clocks up to 500 kHz and maintains lock across –40°C to +125°C.
What is the purpose of the VBIAS pin on the LM26001MXA, and how should it be used?
The VBIAS pin on the LM26001MXA accepts an external ≥3 V supply to bypass the internal VDD LDO, improving conversion efficiency-especially at high input voltages or light loads. When unused, VBIAS must be tied to GND. With VBIAS = 5 V, quiescent current drops to 38 µA typical in sleep mode versus 75 µA when VBIAS = GND, directly reducing system power loss.
Does the LM26001MXA include overcurrent protection, and how is it implemented?
Yes, the LM26001MXA provides cycle-by-cycle overcurrent protection by directly sensing peak inductor current through its internal N-FET. When current reaches the 1.85–3.2 A limit (temperature-dependent), the switch turns off immediately. Under sustained overload or short circuit, frequency foldback reduces fSW to 71 kHz minimum to limit average power dissipation and prevent thermal runaway.
LM26001MXA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM26001MXA FAQ
1.How can I place an order for LM26001MXA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001MXA 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 reliable?
The price and inventory of LM26001MXA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001MXA is usually 5 days.
3.What payment methods are accepted for LM26001MXA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001MXA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001MXA?
LM26001MXA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001MXA 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?
For technical support, including LM26001MXA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001MXA requirements.
6.How does Aetrix verify that LM26001MXA is sourced from the original manufacturer or authorized distributors?
All LM26001MXA 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 meets industry standards.
7.What is the process for return or replacement of LM26001MXA?
All LM26001MXA units undergo pre-shipment inspection (PSI). If there is an issue with LM26001MXA, 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 part is unused and in its original packaging.
Return procedure for LM26001MXA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM26001MXA Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
