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Texas Instruments LM26003MHX/NOPB
- Part No.:
- LM26003MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26003MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM26003MHX/NOPB from Texas Instruments is a 3-A synchronous step-down DC/DC converter with current-mode control, 4.0–38-V input range, adjustable 150–500-kHz switching frequency, and high-efficiency sleep mode (40 µA typical Iq). It integrates an internal N-channel high-side switch, power-good flag, soft-start, and frequency synchronization-designed for automotive telematics and battery-powered standby systems.
For engineers reviewing the LM26003MHX/NOPB datasheet, LM26003MHX/NOPB pinout, LM26003MHX/NOPB application, or LM26003MHX/NOPB equivalent, key selection considerations include its 3-A continuous output capability, 1.5% reference accuracy, thermal shutdown protection, FPWM disable-sleep functionality, and HTSSOP-20 package with exposed pad for thermal management.
Technical Context
The LM26003MHX/NOPB implements current-mode PWM control with cycle-by-cycle peak inductor current limiting and adjustable frequency via a single resistor on the FREQ pin. Its error amplifier features 675 µmho transconductance and COMP pin voltage range of 0.64–1.27 V, enabling stable loop compensation across wide load and line variations.
Sleep mode activation is determined by feedback voltage threshold hysteresis (101.3% wake-up vs. 92% PGOOD assertion), while forced PWM operation disables sleep but retains discontinuous conduction mode at light loads. UVLO triggers at 2.96 V (VIN/VDD) with 180 mV hysteresis, and thermal shutdown activates at 160 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous-supports mid-power industrial and automotive loads without external current boosting. |
| Input Voltage Range | 4.0 V to 38 V-enables direct connection to 12-V/24-V vehicle batteries and accommodates 3-V transient operation during cold-crank events. |
| Reference Accuracy | ±1.5% over –40°C to +125°C-ensures tight output regulation across automotive temperature extremes. |
| Quiescent Current | 40 µA typical in sleep mode-minimizes battery drain in always-on gateway or telematics standby applications. |
| Switching Frequency | 150–500 kHz adjustable-allows optimization of inductor size vs. efficiency and EMI filtering requirements. |
| Peak Current Limit | 4.7 A typical-provides robust short-circuit protection while supporting 3-A nominal output with margin. |
| Power Good Threshold | 92% of nominal VOUT with 2–6% hysteresis-enables reliable system sequencing and fault detection. |
Pinout & Package
LM26003MHX/NOPB uses a 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed thermal pad (EP) connected to GND for enhanced power dissipation. Pin count and layout match TI's standard LM26003 family footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | High-side FET power input | Three parallel VIN pins reduce trace resistance and improve current handling for 3-A operation. |
| AVIN (4) | IC supply input | Dedicated analog supply pin bypassed with ≥100 nF ceramic capacitor for low-noise biasing. |
| PGOOD (5) | Open-drain status flag | Asserts high when VOUT ≥ 92% of setpoint-used for system enable sequencing and fault reporting. |
| EN (6) | Enable control input | Analog-level input; device shuts down when pulled below 0.8 V (typical), drawing only 10.8 µA. |
| SS (7) | Soft-start timing node | Internal 2.5 µA current charges external capacitor-controls ramp rate of VOUT to limit inrush. |
| COMP (8) | Error amplifier compensation | Connect RC network to stabilize control loop; supports Type II/III compensation topologies. |
| FB (9) | Feedback sensing input | Monitors resistor divider output; regulates VOUT to 1.236 V reference with ±1.5% accuracy. |
| AGND (10) | Analog ground reference | Separate ground for precision analog circuitry-must be routed away from noisy PGND paths. |
| PGND (11) | Power ground return | Low-impedance path for switch node current-requires solid copper pour under EP and SW pins. |
| FREQ (12) | Frequency setting output | Connect resistor to GND to set fSW; 62 kΩ → 300 kHz, 240 kΩ → 150 kHz per datasheet equation. |
| FPWM (13) | Sleep mode disable | Pull high (>1.24 V) to force continuous PWM operation-eliminates frequency variation at light loads. |
| SYNC (14) | External clock input | Accepts 1.23 V min square wave; synchronizes fSW ±20% to avoid beat frequencies in multi-rail systems. |
| VBIAS (15) | Bias supply bypass | Connect to ≥3 V rail (e.g., VOUT) to reduce Iq and improve efficiency; auto-switches back if VBIAS drops <2.9 V. |
| VDD (16) | Internal LDO output | 5.99 V regulated output-powers internal circuitry and can source ≤5 mA for external logic pull-ups. |
| BOOT (17) | Bootstrap gate drive | Connect 0.1 µF ceramic cap to SW-generates >6 V gate voltage for high-side N-FET drive. |
| SW (18,19,20) | Switch node outputs | Three parallel SW pins reduce parasitic inductance and thermal stress during 3-A switching transitions. |
| EP | Exposed thermal pad | Must be soldered to GND plane-reduces θJA to 25.4 °C/W and enables sustained 3-A operation at +85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency sleep mode | 40 µA typical Iq maintains regulation during standby-extends battery life in always-on automotive modules. |
| Adjustable soft-start | Programmable ramp time via SS capacitor-prevents output overshoot and inrush current during power-up or recovery. |
| Thermal shutdown protection | 160 °C junction threshold with automatic recovery-ensures safe operation under overload or poor heatsinking. |
| Internal bootstrap diode | Eliminates need for external bootstrap diode-reduces BOM count and PCB area in compact designs. |
| Cycle-by-cycle current limit | Direct high-side FET current sensing-provides fast, accurate overcurrent protection without secondary sense resistors. |
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 3.3-V or 5-V buck regulator delivering stable 3-A output with low quiescent current during ignition-off monitoring. Use Value: Sleep mode Iq of 40 µA prevents excessive battery drain during weeks-long parked operation. | Use Scenario: Supplying display controllers, touch processors, and flash memory in embedded navigation displays. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator converting 12-V battery to 3.3-V logic rail with precise 1.5% reference accuracy. Use Value: 4.0–38-V input range tolerates automotive load-dump transients up to 38 V without shutdown. |
| In-Dash Instrumentation | Battery-Powered Applications |
Use Scenario: Powering digital instrument cluster microcontrollers, LED drivers, and sensor interfaces in modern dashboards. IC Role / Device Role / Timing Role: Main 5-V or 12-V regulator with PGOOD signaling for MCU reset coordination and system health monitoring. Use Value: Open-drain PGOOD flag enables safe processor boot sequencing and brownout detection at 92% VOUT. | Use Scenario: Providing regulated 3.3-V supply for portable test equipment, handheld scanners, and IoT edge nodes. IC Role / Device Role / Timing Role: Standby-capable buck converter operating from Li-ion (3.0–4.2 V) or 2S battery packs with UVLO at 2.96 V. Use Value: 3.0-V minimum input allows continued operation during deep discharge, extending usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26003Q1MHX/NOPB | AEC-Q100 Grade 1 qualified (–40°C to +125°C); identical electrical specs and pinout. | Required for production automotive applications requiring qualification documentation and PPAP support. | Select LM26003Q1MHX/NOPB when automotive-grade reliability, extended temperature validation, and change control are mandatory. |
| LM26002MHX/NOPB | 2-A output rating; same package, control architecture, and feature set except reduced current limit (3.2 A typ). | Suitable for lower-power subsystems where 3-A headroom is unnecessary-reduces cost and thermal design complexity. | Choose LM26002MHX/NOPB for cost-sensitive non-automotive applications with ≤2-A load requirements. |
Compared with LM26003Q1MHX/NOPB, the LM26003MHX/NOPB lacks AEC-Q100 certification but offers identical performance for industrial use; versus LM26002MHX/NOPB, it provides 50% higher current capability at the same footprint-critical for high-density automotive power rails.
Availability
LM26003MHX/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, and battery-powered applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM26003MHX/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 experience in automotive and industrial power conversion.
The LM26003MHX/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for automotive and industrial applications demanding wide input range, low quiescent current, and robust protection features.
FAQ
What is the minimum input voltage required for continuous operation of the LM26003MHX/NOPB?
The LM26003MHX/NOPB supports continuous operation down to 4.0 V input. However, it can sustain regulation during brief line transients as low as 3.0 V-such as automotive cold-crank events-though RDS(ON) increases below 4.0 V due to reduced gate drive voltage from VDD. The UVLO threshold is 2.96 V (typical) with 180 mV hysteresis, ensuring clean startup and shutdown behavior.
How does the FPWM pin affect sleep mode behavior in the LM26003MHX/NOPB?
Pulling the FPWM pin above 1.24 V disables sleep mode in the LM26003MHX/NOPB, forcing continuous PWM operation regardless of load. This stabilizes switching frequency at light loads but increases quiescent current to 160–850 µA depending on VBIAS configuration. At very light loads, the device may still enter a low-threshold sleep state to prevent overvoltage, but normal sleep entry is suppressed.
Can the LM26003MHX/NOPB be synchronized to an external clock, and what are the timing constraints?
Yes, the LM26003MHX/NOPB supports external synchronization via the SYNC pin. It accepts a square-wave signal with minimum 1.23 V peak amplitude and synchronizes to the falling edge. Frequency can be adjusted ±20% around the nominal value set by the FREQ resistor. If unused, SYNC must be pulled low with a 10 kΩ resistor to ensure reliable free-running operation.
What is the purpose of the VBIAS pin on the LM26003MHX/NOPB, and how should it be used?
The VBIAS pin on the LM26003MHX/NOPB allows bypassing the internal LDO to improve efficiency. When connected to a ≥3 V external supply (e.g., VOUT), it reduces input current draw from VIN and lowers die temperature. If VBIAS drops below 2.9 V, the device automatically reverts to internal VDD regulation. Unused VBIAS must be tied to GND.
Does the LM26003MHX/NOPB require an external bootstrap diode?
No, the LM26003MHX/NOPB integrates an internal bootstrap diode, eliminating the need for an external component. A 0.1 µF ceramic capacitor must still be placed between BOOT and SW pins to generate the gate drive voltage for the internal high-side N-channel MOSFET. This integration reduces BOM count and simplifies layout in space-constrained applications.
LM26003MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 38V
- Voltage - Output (Min/Fixed):
- 1.236V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM26003MHX/NOPB FAQ
1.How can I place an order for LM26003MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26003MHX/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 LM26003MHX/NOPB reliable?
The price and inventory of LM26003MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26003MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26003MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26003MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26003MHX/NOPB?
LM26003MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26003MHX/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 LM26003MHX/NOPB?
For technical support, including LM26003MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26003MHX/NOPB requirements.
6.How does Aetrix verify that LM26003MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26003MHX/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 LM26003MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26003MHX/NOPB?
All LM26003MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26003MHX/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 LM26003MHX/NOPB part is unused and in its original packaging.
Return procedure for LM26003MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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