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Texas Instruments LM26001BMH/NOPB
- Part No.:
- LM26001BMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26001BMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
LM26001BMH/NOPB from Texas Instruments is a 1.5A synchronous buck switching regulator with high-efficiency sleep mode, designed for automotive telematics and battery-powered standby applications. It delivers up to 1.5A continuous output current, operates from 4.0V to 18V input, features adjustable 150–500 kHz switching frequency, and achieves <40 µA typical quiescent current in sleep mode.
For engineers reviewing the LM26001BMH/NOPB datasheet, LM26001BMH/NOPB pinout, LM26001BMH/NOPB application, or LM26001BMH/NOPB equivalent, key selection criteria include its forced PWM capability, power-good flag, soft-start control, thermal shutdown protection, and HTSSOP-16 exposed-pad package compatibility with high-density PCB layouts.
Technical Context
The LM26001BMH/NOPB implements current-mode PWM control with cycle-by-cycle peak current limiting and internal N-channel high-side switch. Its feedback loop uses a 1.234 V ±2.0% reference voltage at the FB pin, compensated via external RC network on COMP.
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% of nominal VOUT (PGOOD threshold). Frequency is set by resistor on FREQ pin or synchronized externally via SYNC pin with ±20% to +30% range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A continuous - supports mid-power DC/DC conversion without external current-sense amplifiers |
| Input Voltage Range | 4.0 V to 18 V - suitable for 12 V automotive systems with transient tolerance down to 3.0 V |
| Quiescent Current | 38 µA typical in sleep mode (VBIAS = 5 V) - enables multi-year battery life in always-on standby circuits |
| Reference Voltage | 1.234 V ±2.0% - sets output accuracy for 3.3 V or 5 V rails using standard resistor dividers |
| Switching Frequency | 150–500 kHz adjustable - balances efficiency vs. size: lower fSW allows smaller inductors at light loads |
| Peak Current Limit | 1.80–3.25 A - provides robust short-circuit protection while supporting 1.5 A steady-state load |
| Thermal Shutdown | 160 °C - protects against sustained overload or poor heatsinking in enclosed environments |
| Power Good Threshold | 92% of nominal VOUT - ensures reliable system reset and sequencing in automotive and gateway applications |
Pinout & Package
LM26001BMH/NOPB is housed in a 16-pin HTSSOP package (PWP0016A) with exposed thermal pad (EP), requiring GND connection for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Primary power input | Dual pins reduce trace resistance and improve current handling for 1.5 A operation |
| PGOOD (3) | Open-drain status flag | Signals valid output only when FB ≥ 92% of target - used for microcontroller reset or power sequencing |
| EN (4) | Analog enable input | Active-high with 1.2 V threshold; 4.5 µA internal pull-up allows direct VIN tie for always-on use |
| SS (5) | Soft-start timing node | 2.2 µA internal current source charges external capacitor - controls ramp rate to limit inrush |
| COMP (6) | Error amplifier output | Connects to RC compensation network - stabilizes loop response across line/load/temperature |
| FB (7) | Feedback sensing input | Monitors resistor divider output - sets VOUT = 1.234 V × (1 + R1/R2); ±200 nA bias current minimizes error |
| GND (8) | Power and signal ground | Common return for all internal circuitry; EP must be connected to this node |
| FREQ (9) | Frequency programming node | Resistor-to-GND sets fSW from 150–500 kHz - enables optimization for efficiency or EMI compliance |
| FPWM (10) | Forced PWM mode control | Pull high to disable sleep mode - maintains fixed frequency under light loads for noise-sensitive systems |
| SYNC (11) | External clock synchronization | Accepts 1.2 V square wave; falling edge triggers switch turn-on - eliminates beat frequencies in multi-rail systems |
| VBIAS (12) | Bias supply bypass | Connect to ≥3 V rail (e.g., VOUT) to reduce IQ and internal dissipation - improves full-load efficiency |
| VDD (13) | Internal LDO output | 5.95 V regulated supply; requires ≥1.0 µF ceramic bypass - powers gate driver and logic |
| BOOT (14) | High-side gate drive bootstrap | Connects 0.1 µF ceramic to SW - generates floating voltage for N-FET gate drive above VIN |
| SW (15,16) | Switch node | Drives external inductor; dual pins reduce parasitic inductance and improve thermal spreading |
| EP | Exposed thermal pad | Mandatory GND connection - reduces θJA to 38 °C/W and prevents thermal shutdown at full load |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | Reduces IQ to 38 µA (VBIAS = 5 V), enabling >10-year battery life in low-duty-cycle telemetry nodes |
| Adjustable soft-start | Programmable ramp time via SS capacitor - prevents input capacitor inrush and output overshoot during power-up |
| Synchronizable switching | Accepts external clock on SYNC pin with ±20% to +30% frequency range - eliminates interference in noise-critical RF subsystems |
| Integrated bootstrap diode | Eliminates need for external bootstrap diode - reduces BOM count and layout area in compact automotive modules |
| Thermal shutdown with hysteresis | Triggers at 160 °C and releases at ~145 °C - prevents thermal runaway while allowing recovery after transient overload |
| Low dropout under pulse load | Maintains regulation down to 3.0 V input with off-pulse skipping - sustains operation during cold-crank automotive transients |
Applications
| Automotive Telematics | Navigation Systems |
|---|---|
Use Scenario: Always-on GPS tracking module powered by vehicle battery with frequent sleep/wake cycles. IC Role / Device Role / Timing Role: Primary 3.3 V/1.5 A DC/DC converter supplying MCU, GNSS receiver, and cellular modem. Use Value: Sleep-mode IQ <40 µA extends battery backup runtime to >3 months during ignition-off periods. | Use Scenario: In-dash infotainment unit requiring stable 5 V rail for display controller and audio codec. IC Role / Device Role / Timing Role: Synchronous buck regulator converting 12 V battery to regulated 5 V output. Use Value: Adjustable 150–500 kHz fSW allows EMI filtering optimization to meet CISPR-25 Class 5 requirements. |
| In-Dash Instrumentation | Battery-Powered Applications |
Use Scenario: Digital instrument cluster with LED backlighting and CAN interface, operating across -40°C to +125°C. IC Role / Device Role / Timing Role: Main power supply delivering 3.3 V/1.5 A to microcontroller and sensor interface ICs. Use Value: 160 °C thermal shutdown and -40°C to +125°C operating junction range ensure reliability in under-hood environments. | Use Scenario: Portable medical monitor with rechargeable Li-ion battery and low-power sensor front-end. IC Role / Device Role / Timing Role: Step-down regulator generating 3.3 V from 3.6–4.2 V battery, active during measurement bursts. Use Value: Forced PWM mode (FPWM pin) maintains constant switching frequency during brief high-current pulses, simplifying EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26003MH/NOPB | 3 A output current, same 4–18 V input, identical pinout and feature set except higher current rating | Required where peak load exceeds 1.5 A or future-proofing for higher-power variants is needed | Select LM26003MH/NOPB only if design requires >1.5 A continuous output; otherwise LM26001BMH/NOPB offers better light-load efficiency |
| TPS54202DRCT | 2 A output, 4.5–17 V input, integrated MOSFETs, 500 kHz max fSW, but no sleep mode or PGOOD | Lacks sleep mode (<100 µA IQ) and power-good flag - unsuitable for battery-backed or safety-critical sequencing | Choose TPS54202DRCT only for cost-sensitive, non-standby applications where PGOOD and ultra-low IQ are not required |
Compared with LM26003MH/NOPB, LM26001BMH/NOPB trades peak current headroom for superior light-load efficiency; versus TPS54202DRCT, it adds critical automotive-grade features-sleep mode, PGOOD, and thermal hysteresis-at the cost of slightly higher BOM count.
Availability
LM26001BMH/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, in-dash instrumentation, battery-powered portable devices, and standby power for home gateways requiring stable component supply over extended production lifecycles.
Supply support for LM26001BMH/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 qualification experience.
The LM26001B product line targets high-reliability, low-quiescent-current DC/DC conversion for automotive and industrial standby applications where extended battery life and robust transient response are mandatory.
FAQ
What is the minimum input voltage required for continuous operation of the LM26001BMH/NOPB?
The LM26001BMH/NOPB requires a minimum 4.0 V input for continuous operation within specification. Although it can withstand transients down to 3.0 V, operation below 4.0 V increases RDS(ON) and power dissipation due to reduced VDD gate drive voltage. Startup also requires ≥3.9 V typical at VIN to charge VDD above UVLO threshold.
How does the sleep mode function in the LM26001BMH/NOPB, and what triggers wake-up?
Sleep mode in the LM26001BMH/NOPB activates when FB rises >1% above nominal and COMP falls to ~0.6 V, halting switching and reducing IQ to <40 µA. Wake-up occurs when FB drops to 92% of nominal (PGOOD threshold), resuming PWM operation. This 1% hysteresis limits output ripple to ~1% of VOUT.
Can the LM26001BMH/NOPB be synchronized to an external clock, and what are the synchronization limits?
Yes, the LM26001BMH/NOPB supports external synchronization via the SYNC pin, accepting a 1.2 V square wave. The operating frequency can be adjusted from −20% to +30% relative to the nominal frequency set by the FREQ resistor. SYNC must be pulled low for non-synchronized operation, and the FREQ resistor remains mandatory even when synchronizing.
What is the purpose of the VBIAS pin on the LM26001BMH/NOPB, and how should it be used?
The VBIAS pin on the LM26001BMH/NOPB bypasses the internal VDD regulator when connected to a ≥3 V external supply (e.g., VOUT), reducing total input current and improving full-load efficiency. If unused, VBIAS must be tied to GND. Dropping below 2.9 V causes automatic switchover back to VIN-derived bias.
Does the LM26001BMH/NOPB include internal protection features, and which ones are implemented?
Yes, the LM26001BMH/NOPB integrates cycle-by-cycle current limiting, thermal shutdown at 160 °C, input under-voltage lockout (UVLO) triggered at 2.9 V, and frequency foldback during short-circuit conditions. It also features a power-good flag (PGOOD) with 92% threshold and 5 µs noise immunity delay.
LM26001BMH/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):
- 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
LM26001BMH/NOPB FAQ
1.How can I place an order for LM26001BMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26001BMH/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 LM26001BMH/NOPB reliable?
The price and inventory of LM26001BMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26001BMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM26001BMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26001BMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26001BMH/NOPB?
LM26001BMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26001BMH/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 LM26001BMH/NOPB?
For technical support, including LM26001BMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26001BMH/NOPB requirements.
6.How does Aetrix verify that LM26001BMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26001BMH/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 LM26001BMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM26001BMH/NOPB?
All LM26001BMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26001BMH/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 LM26001BMH/NOPB part is unused and in its original packaging.
Return procedure for LM26001BMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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