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Texas Instruments LM26003QMH/NOPB
- Part No.:
- LM26003QMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26003QMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
LM26003QMH/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, 1.5% reference accuracy, and high-efficiency sleep mode (40 µA typical Iq). It delivers regulated power in automotive telematics and battery-powered standby systems.
For engineers reviewing the LM26003QMH/NOPB datasheet, LM26003QMH/NOPB pinout, LM26003QMH/NOPB application, or LM26003QMH/NOPB equivalent, key selection factors include its AEC-Q100 Grade 1 qualification, FPWM disable-sleep function, VBIAS bypass capability for efficiency optimization, and integrated cycle-by-cycle current limiting with frequency foldback protection.
Technical Context
The LM26003QMH/NOPB implements peak-current-mode PWM control with internal N-channel high-side switch, enabling precise duty-cycle regulation via real-time inductor current sensing and COMP-pin voltage comparison. Its architecture supports discontinuous conduction mode (DCM) under light load in FPWM mode and off-pulse skipping during low-VIN line transients.
It integrates dual UVLO detection (on VIN and VDD), programmable soft-start via external capacitor on SS pin, and synchronized operation with ±20% to +30% frequency tracking range referenced to nominal fSW. The device features internal bootstrap diode, thermal shutdown at 160°C, and power-good flag with 92% VFB threshold and 2–6% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports mid-power automotive and industrial 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 industrial rails; operates down to 3.0 V during transients. |
| Reference Accuracy | ±1.5% over –40°C to +125°C - ensures stable output regulation across automotive temperature extremes. |
| Sleep Mode Iq | 40 µA typical (VBIAS = 5 V) - minimizes quiescent loss in always-on systems like gateway ECUs. |
| Switch RDS(on) | 0.040 Ω min (–40°C to +125°C) - reduces conduction loss and thermal stress at full load. |
| Switching Frequency | 150–500 kHz adjustable via single resistor - balances EMI, size, and efficiency; synchronizable to external clock. |
| Power Good Threshold | 92% of nominal VOUT with 2–6% hysteresis - provides reliable system reset signaling with noise immunity. |
Pinout & Package
LM26003QMH/NOPB uses a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed pad (EP) connected to GND for improved thermal performance. 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 | Parallel inputs reduce trace resistance and improve current sharing into internal switch; must be decoupled locally. |
| AVIN (4) | IC supply input | Dedicated analog rail for internal regulator-requires ≥100-nF ceramic bypass to PGND for stable bias. |
| PGOOD (5) | Open-drain status flag | Asserts high when VOUT ≥ 92% of setpoint; pulls low during fault or startup-enables sequencing and monitoring. |
| EN (6) | Enable control | Analog-input shutdown: <0.8 V disables device; hysteresis prevents chatter near threshold. |
| SS (7) | Soft-start timing | 2.5-µA internal current charges external cap; ramp ends at 1.23 V-controls inrush and avoids overshoot. |
| COMP (8) | Error amplifier compensation | Connect RC network to stabilize loop; transconductance = 675 µmho enables robust phase margin tuning. |
| FB (9) | Feedback sense | Resistor divider sets VOUT; 1.236 V reference with ±1.5% tolerance defines output accuracy. |
| AGND (10) | Analog ground reference | Separate from PGND to isolate noise-sensitive circuitry-must tie to system AGND plane. |
| PGND (11) | Power ground return | Low-impedance path for switch node current-connects directly to EP and input/output capacitors. |
| FREQ (12) | Frequency programming | Resistor-to-GND sets fSW from 150–500 kHz; empirical formula RFREQ = (6.25×10¹⁰)×fSW−1.042. |
| FPWM (13) | Sleep mode disable | Logic-high forces continuous PWM operation-eliminates frequency variation but increases light-load Iq. |
| SYNC (14) | External clock input | Accepts 1.23-V min square wave; falling edge triggers switch-on-enables multi-regulator synchronization. |
| VBIAS (15) | Bias supply bypass | ≥3 V external source reduces Iq and die heating; auto-switches back to VDD if VBIAS drops below 2.9 V. |
| VDD (16) | Internal LDO output | 5.99–6.50 V regulated supply-bypass with ≥1.0-µF ceramic; powers PGOOD/FPWM logic. |
| BOOT (17) | Bootstrap gate drive | Connect 0.1-µF ceramic to SW-generates >VIN gate voltage for high-side N-FET. |
| SW (18,19,20) | Switch node outputs | Three parallel pins reduce inductance and thermal resistance-connect directly to inductor and catch diode/anode. |
| EP | Thermal pad | Exposed pad tied to GND-critical for thermal dissipation; requires ≥70% solder coverage per JEDEC standards. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C junction operation-validated for automotive telematics and instrumentation use. |
| Adjustable soft-start | Capacitor-programmable ramp time prevents inrush current and output overshoot during power-up or recovery. |
| Cycle-by-cycle current limit | Direct peak inductor current sensing enables fast overcurrent response and consistent 3.15–6.05 A trip range. |
| Frequency foldback protection | Reduces fSW to 45 kHz minimum during short-circuit-limits average switch current and thermal stress. |
| Integrated bootstrap diode | Eliminates need for external bootstrap diode-reduces BOM count and PCB area in compact designs. |
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 supplying core logic and RF sections with tight ripple and transient response. Use Value: Sleep mode Iq ≤40 µA extends battery life during vehicle ignition-off; AEC-Q100 Grade 1 ensures reliability over 15-year automotive lifecycle. | Use Scenario: Regulating power for display controllers, touch processors, and map storage in embedded navigation modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering stable 1.2-V or 1.8-V core voltage to SoCs under varying thermal conditions. Use Value: Adjustable frequency (150–500 kHz) allows EMI tuning to avoid interference with AM/FM bands; FPWM mode ensures constant fSW during audio playback. |
| In-Dash Instrumentation | Battery-Powered Standby Systems |
Use Scenario: Supplying microcontrollers, sensors, and backlight drivers in digital instrument clusters with strict EMC requirements. IC Role / Device Role / Timing Role: Main 5-V rail generator with PGOOD signaling for MCU reset coordination and fault-safe shutdown. Use Value: Power-good flag with 92% threshold and hysteresis enables deterministic boot sequencing; thermal shutdown at 160°C protects against enclosure overheating. | Use Scenario: Providing always-on 3.3-V supply for real-time clocks, memory retention, and wake-on-LAN circuits in home gateways and set-top boxes. IC Role / Device Role / Timing Role: Low-quiescent buck regulator maintaining standby voltage while minimizing self-discharge of backup batteries. Use Value: 10.8-µA shutdown Iq and 40-µA sleep Iq extend battery runtime; VBIAS bypass option improves efficiency when VOUT ≥3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26003Q1MH/NOPB | AEC-Q100 Grade 1 qualified variant with identical electrical specs and pinout; differs only in qualification documentation and test flow. | Required for production automotive programs needing full PPAP compliance and automotive-grade traceability. | Select LM26003Q1MH/NOPB when automotive safety or quality documentation (e.g., DPPM, AEC test reports) is mandatory. |
| LM26001QMH/NOPB | 1-A version with same package, pinout, and feature set; lower current limit (1.5 A typ), higher RDS(on) (0.12 Ω), and reduced thermal capability. | Suitable for lower-power subsystems where 3-A capability is unnecessary-e.g., sensor hubs or auxiliary displays. | Choose LM26001QMH/NOPB to reduce cost and board space when load current remains ≤1 A. |
Compared with LM26003QMH/NOPB, LM26003Q1MH/NOPB adds automotive qualification without functional change, while LM26001QMH/NOPB trades current capacity for smaller solution size-both retain identical control architecture, pin compatibility, and design-in tooling.
Availability
LM26003QMH/NOPB is available at Aetrix Electronics and suitable for automotive telematics, navigation systems, in-dash instrumentation, and battery-powered standby systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM26003QMH/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 over 90 years of innovation history.
The LM26003QMH/NOPB belongs to TI's automotive-qualified DC/DC buck regulator product line, engineered specifically for high-reliability, wide-input-voltage power conversion in harsh environments such as vehicle infotainment and body electronics.
FAQ
What is the operating junction temperature range for LM26003QMH/NOPB?
The LM26003QMH/NOPB is rated for –40°C to +125°C operating junction temperature and is AEC-Q100 Grade 1 qualified. This specification is validated per TI's automotive test flow and confirmed in the SNVS576F datasheet Section 7.4. Thermal derating must follow the RθJA = 25.4°C/W value provided in Section 7.5 for the HTSSOP package.
Does LM26003QMH/NOPB support synchronization to an external clock signal?
Yes, LM26003QMH/NOPB supports external clock synchronization via the SYNC pin. It accepts a square-wave input with ≥1.23-V minimum peak voltage and tracks frequencies from –20% to +30% of the nominal fSW set by the FREQ resistor. The SYNC pin must be pulled low if unused, and the FREQ resistor remains mandatory even during synchronization.
How does the FPWM pin affect LM26003QMH/NOPB operation?
Pulling the FPWM pin high disables sleep mode and forces continuous PWM operation across all load conditions. In this mode, switching frequency remains stable but light-load efficiency decreases due to fixed-frequency DCM operation. The FPWM threshold is 1.24 V typical, with hysteresis specified from 0.8 V to 1.6 V over temperature.
What is the purpose of the VBIAS pin on LM26003QMH/NOPB?
The VBIAS pin on LM26003QMH/NOPB allows bypassing the internal VDD regulator with an external ≥3-V supply-typically the output voltage itself-to reduce quiescent current and die heating. When VBIAS drops below 2.9 V, the device automatically reverts to internal VDD regulation. This feature improves system efficiency in 3.3-V to 10-V output applications.
Can LM26003QMH/NOPB operate with input voltage below 4.0 V?
Yes, LM26003QMH/NOPB can operate with input voltages as low as 3.0 V during line transients, though nominal operation begins at 4.0 V. Below 4.0 V, RDS(on) increases due to reduced gate drive, and off-pulse skipping may activate to maintain regulation. UVLO releases at 3.70–4.30 V (rising) and shuts down at 2.70–3.30 V (falling), per Section 7.6 of the datasheet.
LM26003QMH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 1.236V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 3A
- 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:
- 20-HTSSOP
LM26003QMH/NOPB FAQ
1.How can I place an order for LM26003QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26003QMH/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 LM26003QMH/NOPB reliable?
The price and inventory of LM26003QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26003QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM26003QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26003QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26003QMH/NOPB?
LM26003QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26003QMH/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 LM26003QMH/NOPB?
For technical support, including LM26003QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26003QMH/NOPB requirements.
6.How does Aetrix verify that LM26003QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26003QMH/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 LM26003QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM26003QMH/NOPB?
All LM26003QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26003QMH/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 LM26003QMH/NOPB part is unused and in its original packaging.
Return procedure for LM26003QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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