My Inquiry
My Account
Texas Instruments LM26420Q1XMH/NOPB
- Part No.:
- LM26420Q1XMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26420Q1XMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A DL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM26420Q1XMH/NOPB from Texas Instruments is an automotive-qualified dual synchronous buck DC/DC converter delivering 2A per channel, operating from 3V–5.5V input to 0.8V–4.5V outputs with fixed 2.2MHz switching frequency and internal 75mΩ/50mΩ MOSFETs. It supports ratiometric startup into prebiased loads and is deployed in ADAS camera modules and infotainment head units requiring high power density and AM-band immunity.
For engineers reviewing the LM26420Q1XMH/NOPB datasheet, LM26420Q1XMH/NOPB pinout, LM26420Q1XMH/NOPB application, or LM26420Q1XMH/NOPB equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to +125°C), independent precision enable and power-good signals per channel, current-mode control with internal compensation, and 180° out-of-phase operation for reduced input ripple.
Technical Context
The LM26420Q1XMH/NOPB implements current-mode PWM control with a fixed 2.2MHz oscillator, enabling sub-30ns minimum on-time for stable regulation down to 0.8V output across its full 3V–5.5V input range. Its dual-channel architecture uses independent error amplifiers, soft-start ramps, and dedicated PG/EN pins per regulator.
Each channel integrates a 75mΩ high-side and 50mΩ low-side MOSFET pair in BICMOS process, supporting up to 2A continuous load with thermal shutdown at 165°C and overvoltage protection triggered at VFB ≥ 925mV. Phase interleaving reduces input capacitor RMS current and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 5.5V - supports direct connection to automotive 3.3V/5V rails without pre-regulation |
| Output Voltage Range | 0.8V to 4.5V - programmable via external resistor divider; 0.8V reference enables core logic and I/O rail generation |
| Max Output Current | 2A per channel - sustained delivery with integrated 75mΩ/50mΩ MOSFETs eliminates need for external switches |
| Switching Frequency | Fixed 2.2MHz - avoids AM band (530–1710kHz), enables use of compact 1µH inductors and 10µF ceramic capacitors |
| Feedback Reference | 0.8V ±1.5% - high-accuracy internal reference ensures tight output regulation under line/load transients |
| Thermal Shutdown | 165°C - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C |
| EMI Compliance | CISPR25 Class 5 conducted emissions - meets stringent automotive EMC requirements without added filtering |
Pinout & Package
LM26420Q1XMH/NOPB is packaged in a 16-pin WQFN (RUM) measuring 4mm × 4mm with exposed die attach pad (DAP) for thermal and electrical grounding. Pin functions are validated per TI SNVSB35C datasheet Section 4.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 VIND1 | Power Input (Buck 1) | Primary input supply for Channel 1; connects directly to bulk input capacitor |
| 3 SW1 | Switch Node (Buck 1) | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout |
| 4 PGND1 | Power Ground (Buck 1) | Dedicated ground return path for Channel 1 high-side/low-side FETs and inductor |
| 5 FB1 | Feedback Input (Buck 1) | High-impedance analog input sensing output voltage; sets regulation point via resistor divider |
| 6 PG1 | Power-Good Output (Buck 1) | Open-drain signal asserted when VOUT1 is within ±15% of setpoint; requires external pull-up |
| 7 PG2 | Power-Good Output (Buck 2) | Independent open-drain flag for Channel 2; enables precise power sequencing between rails |
| 8 FB2 | Feedback Input (Buck 2) | Separate regulation loop for second output; supports independent voltage programming |
| 9 PGND2 | Power Ground (Buck 2) | Dedicated ground return for Channel 2; must be connected to PGND1 and DAP at single point |
| 10 SW2 | Switch Node (Buck 2) | Second high-frequency switching node; 180° phase shift reduces input ripple current |
| 11,12 VIND2 | Power Input (Buck 2) | Input for Channel 2; may share VIN with VIND1 or use separate source for isolation |
| 13 EN2 | Enable Input (Buck 2) | Logic-high active control with 1.04V threshold and 150mV hysteresis; prevents floating |
| 14 AGND | Analog Ground | Reference for FB/EN/PG circuits; must be routed separately from PGND and tied at DAP |
| 15 VINC | Control Circuit Supply | Bias supply for internal LDO and logic; filtered externally to suppress noise coupling |
| 16 EN1 | Enable Input (Buck 1) | Independent enable with same threshold/hysteresis as EN2; supports staggered or ratiometric startup |
| DAP | Die Attach Pad | Exposed thermal pad - must be soldered to large copper area for thermal performance and primary GND |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), qualified for safety-critical systems with functional safety documentation support |
| Interleaved Operation | 180° phase shift between SW1 and SW2 - cuts input capacitor RMS current by ~30%, easing thermal and size constraints |
| Prebias Startup | Starts into precharged output loads without reverse current or overshoot - essential for hot-swap and multi-rail sequencing |
| Internal Compensation | No external compensation components required - simplifies layout and reduces BOM count while maintaining stability across 0.8–4.5V outputs |
| Overvoltage Protection | Shuts off high-side FET if FB exceeds 925mV - prevents damage during feedback resistor failure or transient events |
| Ultra-Low Shutdown IQ | 0.05µA VINC quiescent current in shutdown - preserves battery life in always-on automotive modules |
Applications
| ADAS Camera Module Power | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP processor (1.8V) in rear-view or surround-view camera systems. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing isolated, sequenced, and monitored 2A outputs with AM-band immunity. Use Value: Eliminates need for two discrete converters; 2.2MHz switching avoids interference with RF receivers and enables <10mm² solution size. |
Use Scenario: Core voltage (0.85V) and I/O voltage (1.8V) generation for automotive-grade application processors in head units. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying tightly regulated, low-noise rails with independent enable and power-good signaling. Use Value: Ratiometric startup ensures safe boot sequence; ±1.5% VREF and PG hysteresis guarantee reliable SoC reset and monitoring. |
| Cluster Display Backlight Driver | Telematics LTE Modem Power |
|
Use Scenario: Driving LED backlight strings (3.3V) and display controller (1.2V) in digital instrument clusters. IC Role / Device Role / Timing Role: Dual-output DC/DC with independent EN/PG for fault-tolerant power management and brightness control interface. Use Value: 180° interleaving minimizes input ripple feeding sensitive display timing circuits; CISPR25 Class 5 compliance ensures EMC pass without shielding. |
Use Scenario: Powering LTE modem baseband (1.1V) and RF front-end (3.3V) in vehicle telematics control units. IC Role / Device Role / Timing Role: Automotive-qualified dual regulator with fast transient response and thermal protection for cellular connectivity subsystems. Use Value: 165°C thermal shutdown prevents latch-up during extended data bursts; prebias startup maintains link integrity during modem reconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6521905RGER | Single 3A buck + dual LDO; no dual 2A buck topology; lower max output current per rail (1.5A) | Limited to lower-power infotainment peripherals; lacks interleaving and AM-band immunity | Choose when system requires integrated LDOs and lower cost outweighs dual-buck performance |
| MPQ4420AGU-AEC1-P | 2A dual buck but fixed 2.1MHz (not 2.2MHz); no independent PG/EN per channel; Q1 grade only | Acceptable for non-sequencing ADAS sensors; lacks precision sequencing capability for complex SoCs | Choose when board space is constrained and independent power-good signaling is not required |
Compared with TPS6521905RGER and MPQ4420AGU-AEC1-P, the LM26420Q1XMH/NOPB uniquely delivers true dual 2A channels with independent enable/power-good, 2.2MHz AM-band avoidance, and AEC-Q100 Grade 1 + functional safety support - making it optimal for high-integrity automotive power domains.
Availability
LM26420Q1XMH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LM26420Q1XMH/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 deep expertise in automotive power management ICs and functional safety design.
The LM26420-Q1 product line targets high-reliability automotive subsystems demanding dual-rail efficiency, EMI robustness, and seamless integration into ASIL-B/C architectures - particularly in vision, radar, and infotainment domains.
FAQ
What is the maximum junction temperature and thermal shutdown behavior of the LM26420Q1XMH/NOPB?
The LM26420Q1XMH/NOPB activates thermal shutdown at 165°C junction temperature and remains latched off until the junction cools to approximately 150°C. This hysteresis prevents cycling during transient overloads. The device's RθJA is 36.2°C/W in the RUM (WQFN-16) package, enabling 2A operation with moderate PCB copper area. Thermal performance is validated per AEC-Q100 Grade 1 ambient limits (–40°C to +125°C).
Does the LM26420Q1XMH/NOPB support startup into a prebiased output, and how does it behave?
Yes, the LM26420Q1XMH/NOPB supports controlled startup into prebiased outputs without reverse current or overshoot. During prebias startup, the soft-start ramp begins from the existing FB voltage rather than 0V, maintaining the same 600µs ramp rate. This feature is critical for hot-swap scenarios and multi-rail systems where one rail powers up before others. Both channels operate independently, allowing mixed prebias conditions.
How does the LM26420Q1XMH/NOPB achieve CISPR25 Class 5 compliance without external filters?
The LM26420Q1XMH/NOPB achieves CISPR25 Class 5 conducted emissions compliance through 2.2MHz fixed-frequency operation (above AM band), optimized gate drive timing, internal 180° phase interleaving to cancel input ripple, and integrated MOSFETs with controlled slew rates. Layout best practices - including tight SW loop area, proper PGND routing, and DAP grounding - are essential to maintain compliance without added LC filters.
What is the function of the VINC pin on the LM26420Q1XMH/NOPB, and how should it be decoupled?
The VINC pin supplies bias voltage to the internal control circuitry and LDO. It must be decoupled with an RC filter (e.g., 1–10Ω resistor + 0.22–1µF X7R capacitor) placed adjacent to the pin, referenced to AGND. This prevents high-frequency noise from VIN from disturbing the error amplifier and PWM comparator. The RC time constant must exceed 2µs, and CF must connect directly to AGND with minimal trace length to ensure stable regulation.
Can the LM26420Q1XMH/NOPB be used in AEC-Q100 Grade 0 applications, and what is the difference from Grade 1?
The LM26420Q1XMH/NOPB is qualified to AEC-Q100 Grade 1 (–40°C to +125°C ambient). While the underlying silicon supports Grade 0 (–40°C to +150°C), this specific variant (XMH/NOPB) is tested and certified only for Grade 1. For Grade 0 designs, TI offers the LM26420Q0 variant - which shares identical electrical specs but undergoes extended temperature validation. Always verify part marking and datasheet revision (SNVSB35C) for qualification scope.
LM26420Q1XMH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
LM26420Q1XMH/NOPB FAQ
1.How can I place an order for LM26420Q1XMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26420Q1XMH/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 LM26420Q1XMH/NOPB reliable?
The price and inventory of LM26420Q1XMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26420Q1XMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM26420Q1XMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26420Q1XMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26420Q1XMH/NOPB?
LM26420Q1XMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26420Q1XMH/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 LM26420Q1XMH/NOPB?
For technical support, including LM26420Q1XMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26420Q1XMH/NOPB requirements.
6.How does Aetrix verify that LM26420Q1XMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26420Q1XMH/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 LM26420Q1XMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM26420Q1XMH/NOPB?
All LM26420Q1XMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26420Q1XMH/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 LM26420Q1XMH/NOPB part is unused and in its original packaging.
Return procedure for LM26420Q1XMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM26420Q1XMH/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
