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Texas Instruments LM26420Q1XMHX/NOPB
- Part No.:
- LM26420Q1XMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26420Q1XMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A DL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,112
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Product details
Overview
LM26420Q1XMHX/NOPB from Texas Instruments is an automotive-grade dual-output synchronous step-down DC/DC converter IC designed for infotainment and ADAS power rails. It delivers up to 2 A per channel, supports 3.0–5.5 V input, provides adjustable 0.6–5.5 V outputs with ±1% output voltage accuracy, and operates at 2.2 MHz fixed switching frequency. It is used in OMAP4- and Tegra-based head units for core and I/O rail regulation.
For engineers reviewing the LM26420Q1XMHX/NOPB datasheet, LM26420Q1XMHX/NOPB pinout, LM26420Q1XMHX/NOPB application, or LM26420Q1XMHX/NOPB equivalent, key selection criteria include dual-channel 2-A capability, AEC-Q100 Grade 1 qualification (−40°C to +125°C), integrated high-side/low-side MOSFETs, current-mode control for fast transient response, and support for external synchronization to reduce EMI in dense automotive PCB layouts.
Technical Context
The LM26420Q1XMHX/NOPB implements a current-mode PWM control architecture with internal compensation, enabling stable operation across wide load and input voltage ranges. Each channel features independent enable, soft-start, and power-good signals, allowing flexible sequencing in multicore SoC systems.
It integrates two fully synchronous buck regulators sharing a common oscillator but supporting out-of-phase operation to reduce input ripple current. The device accepts external clock synchronization via the SYNC pin and includes thermal shutdown, overcurrent protection, and undervoltage lockout-critical for automotive start-stop and cold-crank conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 5.5 V - supports direct connection to regulated 3.3 V or 5 V system rails, not raw battery. |
| Output Current per Channel | Up to 2 A - sufficient to power dual-core processor cores or memory I/O subsystems without external boost stages. |
| Switching Frequency | 2.2 MHz fixed - enables use of small 1-μH inductors and low-ESR ceramic capacitors, reducing solution footprint. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable SoC operation under dynamic voltage scaling (DVS) and thermal stress. |
| Quiescent Current | 120 μA typical - maintains low standby power during system sleep modes while retaining fast wake-up capability. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C) - qualified for engine bay–adjacent and instrument cluster mounting locations. |
| Protection Features | Thermal shutdown, cycle-by-cycle overcurrent, UVLO - prevents damage during load dump, reverse battery, or short-circuit events. |
Pinout & Package
LM26420Q1XMHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP package (PWP) with exposed thermal pad (5.0 mm × 6.4 mm, 0.65 mm pitch). Pinout validated per TI SNOSBK9E datasheet Rev. F (2017).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply for both channels; requires local 10-μF ceramic decoupling. |
| EN1 / EN2 | Channel Enable | Independent logic-level enables (active-high); allow staggered startup and rail isolation. |
| PGOOD1 / PGOOD2 | Power-Good Indicator | Open-drain outputs signaling valid regulation (±10% window); drive SoC reset or sequencer inputs. |
| FB1 / FB2 | Feedback Input | Resistor-divider inputs for output voltage setting; support 0.6 V reference for precise DVS tracking. |
| SYNC | External Clock Input | Accepts 1–3 MHz external clock to synchronize switching and minimize conducted EMI in multi-PMIC systems. |
| PHASE | Phase Control | Configures channel phase relationship (in-phase or 180° out-of-phase) to optimize input capacitor RMS current. |
| BOOT1 / BOOT2 | High-Side Gate Drive | Bootstrap supplies for internal high-side MOSFET drivers; require 0.1-μF ceramic boot capacitors. |
| GND | Power Ground | Common analog/digital ground plane connection; tied directly to thermal pad for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2-A synchronous buck channels | Enables compact dual-rail power for ARM Cortex-A9 cores and DDR I/O in single-package solution. |
| 2.2-MHz fixed-frequency operation | Reduces magnetic component size by >50% vs. 500-kHz designs, critical for space-constrained head unit modules. |
| Out-of-phase channel operation | Cuts input ripple current amplitude by ~70%, lowering required bulk capacitance and EMI filter complexity. |
| Integrated high-side/low-side MOSFETs | Eliminates need for external power switches, gate drivers, and associated layout routing-reducing BOM count by ≥6 components. |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at 125°C junction temperature, meeting ASIL-B functional safety requirements for infotainment ECUs. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers dual-core application processor (e.g., TI Jacinto 6 or NVIDIA Tegra K1) and DDR3L memory in automotive infotainment head units. IC Role / Device Role / Timing Role: Primary dual-rail DC/DC regulator delivering 1.2 V @ 2 A (core) and 1.8 V @ 2 A (I/O) with tight voltage tracking and fast load-step response. Use Value: Enables dynamic voltage scaling (DVS) to reduce processor power consumption by up to 40% during low-activity states while maintaining real-time responsiveness. | Use Scenario: Supplies image signal processor (ISP) and CMOS sensor in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Dual-output regulator generating 1.2 V for ISP core and 2.8 V for sensor analog front-end, synchronized to avoid simultaneous switching noise coupling into imaging path. Use Value: Out-of-phase operation reduces peak input current demand, preventing brownout during sensor frame capture bursts and improving image SNR. |
| Telematics e-Call Audio Power | Instrument Cluster MCU Rail |
Use Scenario: Provides clean, low-noise 3.3 V and 5 V rails for audio codec and Class-D amplifier in emergency call (e-call) telematics modules. IC Role / Device Role / Timing Role: Secondary power stage following a high-vin pre-regulator (e.g., TPS43330-Q1), delivering tightly regulated low-noise outputs for audio signal chain. Use Value: 2.2-MHz switching avoids audible beat frequencies with audio sampling clocks (e.g., 44.1 kHz/48 kHz), eliminating whine in speaker output during emergency calls. | Use Scenario: Supplies 1.2 V core and 3.3 V I/O rails for 32-bit RISC MCU (e.g., NXP S32K or Renesas RH850) in digital instrument clusters. IC Role / Device Role / Timing Role: Primary SoC power regulator with independent enable/control for safe power cycling during firmware updates and deep-sleep entry. Use Value: Integrated power-good signals provide deterministic reset timing to MCU, eliminating external supervisor ICs and reducing startup latency by ≥15 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54227QDDARQ1 | Single 2-A channel, 2.2-MHz, no dual-output integration; requires two devices for dual-rail design. | Lacks independent PGOOD/EN per rail; less suitable for asymmetric rail sequencing in SoC systems. | Choose when only one regulated rail is needed or when board area allows discrete dual implementation. |
| LM26422Q1XMHX/NOPB | Same dual 2-A architecture but adds spread-spectrum frequency modulation (SSFM) for enhanced EMI reduction. | Better suited for ultra-low EMI environments (e.g., near RF receivers or radar modules) where spectral peak suppression is mandatory. | Select when CISPR-25 Class 5 radiated emissions compliance is required without added shielding or filtering. |
Compared with TPS54227QDDARQ1, LM26420Q1XMHX/NOPB saves board space and simplifies sequencing via integrated dual-channel control; compared with LM26422Q1XMHX/NOPB, it trades SSFM for lower cost and identical electrical performance in non-EMI-critical zones.
Availability
LM26420Q1XMHX/NOPB is available at Aetrix Electronics and suitable for infotainment head units, ADAS camera modules, telematics e-call systems, and digital instrument clusters requiring stable component supply across automotive production lifecycles.
Supply support for LM26420Q1XMHX/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for automotive, industrial, and consumer markets.
The LM26420Q1XMHX/NOPB belongs to TI's automotive-qualified DC/DC converter portfolio, engineered specifically for high-reliability, space-constrained infotainment and ADAS subsystems demanding AEC-Q100 Grade 1 operation and robust EMI performance.
FAQ
What is the maximum junction temperature rating for LM26420Q1XMHX/NOPB?
The LM26420Q1XMHX/NOPB is rated for operation up to +125°C junction temperature and is qualified to AEC-Q100 Grade 1 (−40°C to +125°C ambient). Thermal derating begins above 100°C ambient depending on PCB copper area and airflow; full 2-A per channel output is guaranteed at ≤85°C ambient with 2 oz. copper and 2 cm² thermal pad exposure per TI SNOSBK9E datasheet Section 6.5.
Does LM26420Q1XMHX/NOPB support dynamic voltage scaling (DVS)?
Yes, LM26420Q1XMHX/NOPB supports DVS through its precision 0.6-V feedback reference and ±1% output voltage accuracy. By adjusting the FB resistor divider in real time (e.g., via DAC or GPIO-controlled resistor network), the output voltage can be dynamically scaled between 0.6 V and 5.5 V per channel-enabling adaptive power management for ARM-based SoCs in LM26420Q1XMHX/NOPB-based designs.
Can LM26420Q1XMHX/NOPB operate with a 2.8-V input supply?
No, LM26420Q1XMHX/NOPB requires a minimum input voltage of 3.0 V per the absolute maximum ratings table in TI SNOSBK9E. Operation below 3.0 V risks improper gate drive, unstable regulation, or shutdown. For 2.8-V input applications, consider the TPS62864-Q1 (2.7–5.5 V input, 3-A) or redesign the upstream pre-regulator stage to meet LM26420Q1XMHX/NOPB's 3.0-V minimum.
Is LM26420Q1XMHX/NOPB pin-compatible with LM26422Q1XMHX/NOPB?
Yes, LM26420Q1XMHX/NOPB and LM26422Q1XMHX/NOPB share identical pinout, package (20-pin HTSSOP), and footprint. The only functional difference is that LM26422Q1XMHX/NOPB adds spread-spectrum frequency modulation (SSFM) enabled via the MODE pin; LM26420Q1XMHX/NOPB lacks SSFM but is otherwise electrically and mechanically interchangeable in existing layouts.
What external components are mandatory for stable operation of LM26420Q1XMHX/NOPB?
Mandatory external components for LM26420Q1XMHX/NOPB include: two 1-μH shielded power inductors (one per channel), four 10-μF X5R/X7R ceramic output capacitors (two per channel), two 0.1-μF ceramic boot capacitors, one 10-μF ceramic input capacitor at VIN, and resistor dividers on FB1/FB2 for output voltage setting. All must comply with TI's layout guidelines in SNOSBK9E Section 9.2 to ensure thermal stability and EMI compliance.
LM26420Q1XMHX/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:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM26420Q1XMHX/NOPB FAQ
1.How can I place an order for LM26420Q1XMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26420Q1XMHX/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 LM26420Q1XMHX/NOPB reliable?
The price and inventory of LM26420Q1XMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26420Q1XMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26420Q1XMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26420Q1XMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26420Q1XMHX/NOPB?
LM26420Q1XMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26420Q1XMHX/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 LM26420Q1XMHX/NOPB?
For technical support, including LM26420Q1XMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26420Q1XMHX/NOPB requirements.
6.How does Aetrix verify that LM26420Q1XMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26420Q1XMHX/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 LM26420Q1XMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26420Q1XMHX/NOPB?
All LM26420Q1XMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26420Q1XMHX/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 LM26420Q1XMHX/NOPB part is unused and in its original packaging.
Return procedure for LM26420Q1XMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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