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Texas Instruments LM26001BMHX/NOPB
- Part No.:
- LM26001BMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001BMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
LM26001BMHX/NOPB from Texas Instruments is a 1.5A synchronous buck switching regulator with high-efficiency sleep mode, 4.0–18V input range, adjustable 150–500 kHz switching frequency, and integrated N-channel MOSFET switch. It delivers stable 3.3V output in automotive telematics and battery-powered instrumentation where low quiescent current (<40 µA in sleep mode) and line transient resilience (down to 3.0V) are critical.
For engineers reviewing the LM26001BMHX/NOPB datasheet, LM26001BMHX/NOPB pinout, LM26001BMHX/NOPB application, or LM26001BMHX/NOPB equivalent, key selection criteria include sleep-mode IQ, FPWM disable control, PGOOD flag timing, thermal shutdown at 160°C, and HTSSOP-16 exposed-pad package layout compatibility.
Technical Context
The LM26001BMHX/NOPB implements current-mode PWM control with cycle-by-cycle peak current limiting (1.8–3.25 A), internal error amplifier (670 µmho transconductance), and adaptive off-pulse skipping for low-VIN operation. Its feedback loop uses a 1.234 V ±2.5% reference with 0.64–1.27 V COMP pin voltage range.
Sleep mode activates when FB rises ≥1% above nominal and COMP drops to ~0.6 V, reducing IQ to <40 µA; wake-up occurs at 92% FB threshold with 7% hysteresis. Synchronization supports ±20% frequency deviation from nominal, and FPWM forces continuous PWM operation regardless of load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous; supports automotive infotainment loads without external current boosting |
| Input Voltage Range | 4.0 V to 18 V continuous; operates down to 3.0 V during transients-enables robustness in 12 V vehicle systems |
| Quiescent Current | 38 µA typical in sleep mode (VBIAS = 5 V); enables >1-year battery life in always-on gateway standby |
| Switching Frequency | 150–500 kHz adjustable via single resistor; avoids AM radio band and allows optimized EMI/efficiency trade-off |
| Reference Accuracy | ±2.0% over −40°C to +125°C; ensures stable 3.3 V rail tolerance across automotive temperature range |
| Power Good Threshold | 92% of nominal VOUT rising edge, 7% hysteresis; provides clean system reset signaling without external comparators |
| Thermal Shutdown | 160°C junction limit with automatic recovery; protects against sustained overload in sealed enclosures |
Pinout & Package
LM26001BMHX/NOPB is housed in a 16-pin HTSSOP package (PWP0016A) with exposed thermal pad (EP) that must be soldered to GND for thermal performance and EMI reduction. Pin pitch is 0.65 mm; body dimensions are 5.0 × 4.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Primary power input | Dual pins reduce trace resistance and improve current sharing for high-peak-load automotive applications |
| PGOOD (3) | Open-drain status flag | Signals valid regulation after soft-start; sinks 500 µA at 64 Ω RON-directly drives MCU GPIO or reset IC |
| EN (4) | Enable control | Analog threshold (0.8–1.4 V) with 120 mV hysteresis; supports direct connection to microcontroller I/O or pull-up to VIN |
| SS (5) | Soft-start timing | 2.2 µA internal current source charges external capacitor; sets controlled VOUT ramp to prevent inrush and overshoot |
| COMP (6) | Loop compensation node | Connects to RC network for Type II/III compensation; 0.64–1.27 V operating range ensures stability across load steps |
| FB (7) | Feedback sensing | Monitors resistor divider output; 1.234 V reference enables precise 3.3 V, 5 V, or custom VOUT configurations |
| GND (8) | Power and signal ground | Common return for VIN, SW, and analog circuitry; ties to EP for lowest thermal resistance (θJA = 38°C/W) |
| FREQ (9) | Frequency setting | Resistor-to-GND sets fSW; empirical formula RFREQ = 6.25×10¹⁰ × fSW−1.042 enables accurate 330 kHz design |
| FPWM (10) | Sleep mode disable | Logic-high (>1.2 V) forces continuous PWM; eliminates light-load frequency variation in noise-sensitive audio subsystems |
| SYNC (11) | External clock input | Accepts 1.2 V peak square wave; synchronizes to master clock to eliminate beat frequencies in multi-rail systems |
| VBIAS (12) | Bias supply bypass | Connect to ≥3 V external rail (e.g., VOUT) to reduce VIN current and improve full-load efficiency by ~2% |
| VDD (13) | Internal LDO output | 5.95 V regulated supply; powers gate driver and logic; requires ≥1.0 µF ceramic bypass for stability |
| BOOT (14) | High-side gate drive | Connects 0.1 µF ceramic to SW; generates floating voltage for N-FET gate-no external bootstrap diode needed |
| SW (15,16) | Switch node | Dual-source pins handle 1.5 A peak current; connects to inductor and catch diode/COUT-critical for EMI layout |
| EP | Thermal pad | Mandatory GND connection; accounts for >50% of total heat dissipation-reduces junction temp by up to 25°C |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces IQ to 38 µA (VBIAS = 5 V), enabling >10-year shelf life in battery-backed navigation modules |
| Adjustable soft-start | Programmable ramp time via SS capacitor prevents inrush into large output caps-eliminates need for external sequencers |
| Integrated bootstrap diode | Removes external diode requirement, saving BOM cost and PCB area while maintaining >92% efficiency at 1 A |
| Power good flag with hysteresis | 7% PGOOD hysteresis prevents chatter during marginal line conditions-ensures reliable system boot sequencing |
| Thermal shutdown with auto-recovery | 160°C trip point and hysteresis allow safe operation under temporary overload without manual reset |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
|
Use Scenario: Powering GPS/GNSS receiver, cellular modem, and CAN interface in connected car black box. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator supplying noise-sensitive RF and digital baseband circuits. Use Value: Sleep-mode IQ <40 µA extends battery backup runtime during ignition-off; FPWM disables frequency dither for clean RF spectrum. |
Use Scenario: Generating stable 3.3 V rail for touchscreen controller, map storage, and inertial measurement unit (IMU). IC Role / Device Role / Timing Role: High-PSRR, low-noise DC/DC converter ensuring accurate ADC sampling and display timing integrity. Use Value: 2.0% reference accuracy maintains IMU sensor calibration across −40°C to +85°C; PGOOD enables safe firmware update sequencing. |
| In-Dash Instrumentation | Battery-Powered Applications |
|
Use Scenario: Supplying cluster microcontroller, TFT backlight driver, and CAN transceiver in digital instrument panel. IC Role / Device Role / Timing Role: Main power stage with fast transient response to support dynamic display updates and CAN bus arbitration pulses. Use Value: Cycle-by-cycle current limit (1.8–3.25 A) prevents latch-up during short-circuit events on backlight traces; SYNC aligns switching to display refresh clock. |
Use Scenario: Powering portable medical monitor with OLED display, Bluetooth LE, and analog front-end sensors. IC Role / Device Role / Timing Role: Standby-optimized regulator delivering 3.3 V from single Li-ion cell (3.0–4.2 V) with minimal dropout. Use Value: Off-pulse skipping extends operation below 3.3 V input; 10 µA shutdown current enables multi-year shelf life in emergency devices. |
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 3–22 V input range, same HTSSOP-16 package and pinout | Required for designs needing >1.5 A or extended low-VIN operation below 4.0 V | Select when scaling power delivery without changing PCB layout or control logic |
| TPS54202HDDCR | 2 A output, 4.5–17 V input, 500 kHz fixed frequency, no sleep mode; 6-pin SOT-23 package | Lacks sleep mode and PGOOD; suited for space-constrained, cost-sensitive non-automotive applications | Choose only if footprint size and BOM count outweigh need for ultra-low IQ and automotive-grade monitoring |
Compared with LM26003MHX/NOPB, LM26001BMHX/NOPB offers lower cost and smaller thermal footprint for ≤1.5 A loads; versus TPS54202HDDCR, it provides essential automotive features-sleep mode, PGOOD, and 3.0 V transient support-that cannot be replicated externally.
Availability
LM26001BMHX/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, in-dash instrumentation, battery-powered medical monitors, and home gateway standby power requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM26001BMHX/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 qualification expertise and AEC-Q100-compliant product development.
The LM26001B belongs to TI's high-efficiency buck regulator product line, engineered specifically for automotive and industrial applications demanding ultra-low quiescent current, wide input range, and robust protection features under harsh electrical environments.
FAQ
What is the minimum input voltage required for continuous operation of the LM26001BMHX/NOPB?
The LM26001BMHX/NOPB requires a minimum of 4.0 V for continuous operation within specification. Although it can withstand input transients as low as 3.0 V, operation below 4.0 V increases RDS(ON) and power dissipation due to reduced gate drive voltage from VDD. For reliable long-term use, maintain VIN ≥ 4.0 V except during brief line dips.
How does the sleep mode function in the LM26001BMHX/NOPB, and what triggers wake-up?
Sleep mode in the LM26001BMHX/NOPB activates when FB rises ≥1% above nominal and COMP falls to ~0.6 V, reducing IQ to <40 µA. Wake-up occurs when FB drops to 92% of nominal (measured at FB pin), with 7% hysteresis preventing oscillation. This 1% window limits output ripple to ~1% of VOUT, preserving signal integrity in sensitive analog circuits.
Can the LM26001BMHX/NOPB be synchronized to an external clock, and what are the synchronization limits?
Yes, the LM26001BMHX/NOPB supports external synchronization via the SYNC pin. It accepts a 1.2 V peak square wave and adjusts operating frequency from −20% to +30% of the nominal value set by the FREQ resistor. The SYNC pin must be pulled low when unused, and the FREQ resistor remains mandatory to define the base frequency-even during sync operation.
What is the purpose of the VBIAS pin on the LM26001BMHX/NOPB, and how should it be used?
The VBIAS pin on the LM26001BMHX/NOPB bypasses the internal VDD LDO when connected to an external ≥3 V supply (e.g., VOUT or auxiliary rail), reducing VIN current and improving full-load efficiency by ~2%. If unused, tie VBIAS to GND. Automatic switchover occurs if VBIAS drops below 2.9 V, ensuring seamless fallback to internal regulation.
Does the LM26001BMHX/NOPB include over-current protection, and how does it behave during a short circuit?
Yes, the LM26001BMHX/NOPB includes cycle-by-cycle peak current limiting (1.8–3.25 A) and short-circuit frequency foldback. During output short, FB falls below 0.87 V, triggering foldback that reduces switching frequency to ≥71 kHz. This lowers average switch current and mitigates thermal stress-critical for sustaining fault conditions without damage.
LM26001BMHX/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):
- 18V
- Voltage - Output (Min/Fixed):
- 1.234V
- Voltage - Output (Max):
- 16V
- 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
LM26001BMHX/NOPB FAQ
1.How can I place an order for LM26001BMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001BMHX/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 LM26001BMHX/NOPB reliable?
The price and inventory of LM26001BMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001BMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26001BMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001BMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001BMHX/NOPB?
LM26001BMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001BMHX/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 LM26001BMHX/NOPB?
For technical support, including LM26001BMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001BMHX/NOPB requirements.
6.How does Aetrix verify that LM26001BMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26001BMHX/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 LM26001BMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26001BMHX/NOPB?
All LM26001BMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26001BMHX/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 LM26001BMHX/NOPB part is unused and in its original packaging.
Return procedure for LM26001BMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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