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LM26420-Q1

ACTIVE

Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter

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Data sheet

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TPS62442-Q1 ACTIVE Automotive 2.75-V to 6-V, dual 2-A or 3-A and 1-A output, adjustable frequency, step-down converter Next generation dual buck with smaller size wand broader VIN range.

LM26420-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 2200 Features Enable, Light Load Efficiency, Light load efficiency, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 4.5 Iq (typ) (µA) 900 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 2200 Features Enable, Light Load Efficiency, Light load efficiency, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 4.5 Iq (typ) (µA) 900 Duty cycle (max) (%) 98
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4 WQFN (RUM) 16 16 mm² 4 x 4
  • Qualified for automotive applications
  • AEC Q100-qualified with the following results:
    • Device temperature grade 0 (Q0): –40°C to +150°C ambient operating temperature
    • Device temperature grade 1 (Q1): –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Compliant with CISPR25 class 5 conducted emissions
  • Input voltage range of 3 V to 5.5 V
  • Output voltage range of 0.8 V to 4.5 V
  • 2-A Output current per regulator
  • Fixed 2.2-MHz switching frequency
  • 0.8 V, 1.5% Internal voltage reference
  • Internal soft start
  • Independent power good and precision enable for each output
  • Current mode, PWM operation
  • Thermal shutdown
  • Overvoltage protection
  • Start-up into prebiased output loads
  • Regulators are 180° out of phase
  • Create a custom design using the LM26420-Q1 with the WEBENCH® Power Designer
  • Qualified for automotive applications
  • AEC Q100-qualified with the following results:
    • Device temperature grade 0 (Q0): –40°C to +150°C ambient operating temperature
    • Device temperature grade 1 (Q1): –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Compliant with CISPR25 class 5 conducted emissions
  • Input voltage range of 3 V to 5.5 V
  • Output voltage range of 0.8 V to 4.5 V
  • 2-A Output current per regulator
  • Fixed 2.2-MHz switching frequency
  • 0.8 V, 1.5% Internal voltage reference
  • Internal soft start
  • Independent power good and precision enable for each output
  • Current mode, PWM operation
  • Thermal shutdown
  • Overvoltage protection
  • Start-up into prebiased output loads
  • Regulators are 180° out of phase
  • Create a custom design using the LM26420-Q1 with the WEBENCH® Power Designer

The LM26420-Q1 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.

Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420-Q1 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.

Because its switching frequency is ensured to be greater than 2 MHz, the LM26420-Q1 can be used in automotive applications without causing interference in the AM frequency band.

The LM26420-Q1 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.

Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420-Q1 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.

Because its switching frequency is ensured to be greater than 2 MHz, the LM26420-Q1 can be used in automotive applications without causing interference in the AM frequency band.
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Technical documentation

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Type Title Date
* Data sheet LM26420-Q1 Dual 2-A, Automotive-Qualified, High-Efficiency Synchronous DC/DC Converter datasheet (Rev. B) PDF | HTML 18 May 2020
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Functional safety information LM26420-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 23 Apr 2020
Test report Automotive Wide-VIN to Point-of-Load Power Supply Reference Design (Rev. A) 26 Mar 2020
Technical article Build a sub-20W CISPR25 Class 5 power design for automotive infotainment processor PDF | HTML 02 May 2017
Technical article Spread Spectrum: Headache tablet or vitamin pill? PDF | HTML 18 May 2015
EVM User's guide AN-1870 LM26420 Evaluation Board (Rev. B) 24 Apr 2013
Application note AN-1973 Benefits and Challenges of High-Frequency Regulators (Rev. A) 23 Apr 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM26420XMHEVAL — LM26420 2.2 MHz, eTSSOP Synchronous Buck Evaluation Board

The LM26420 Evaluation board was designed to provide two 2A outputs, VOUT1 and VOUT2 . It is available in either the eTSSOP package option of the LM26420 for easier probing or the LLP version for evaluating the smaller package. The design emphasizes on the compactness of the LM26420 PCB layout and (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM26420XSQEVAL — LM26420 2.2 MHz, LLP Synchronous Buck Evaluation Board

The LM26420 Evaluation board was designed to provide two 2A outputs, VOUT1 and VOUT2 . It is available in either the eTSSOP package option of the LM26420 for easier probing or the LLP version for evaluating the smaller package. The design emphasizes on the compactness of the LM26420 PCB layout and (...)

User guide: PDF
Not available on TI.com
Evaluation board

TPS92662AEVM6-104 — TPS92662A-Q1 six channel matrix evaluation module

The TPS92662AEVM6-104 consists of 66 invidividually controllable LEDs configured into a six channel application. This evaluation module shows the versatility and configurability of the TPS92662A-Q1 LED Matrix Manager Device. Using the companion control PCB, 6CHAUTOECU-899, and the TPS92662AEVM (...)
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Reference designs

TIDA-00746 — 17W System-Level Power Reference Design for Automotive Infotainment Processor Power

TIDA-00746 is a 17W system-optimized SMPS design for automotive infotainment processor power. The design has been tested for and passed CISPR25 Class 5 conducted EMI  limits.  All buck converters used in this design is switching above AM band (>1.85MHz).

The design is divided into four major blocks:
  1. (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-050040 — Automotive LED headlight driver module for halogen replacement reference design

This reference design showcases the TPS92682 and the TPS92520 as a fully self functional three-channel LED driver for headlight applications.  The design is intended to be a low-cost halogen headlight module replacement compatible with an automotive body control module.  The three LED (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP15023 — Automotive wide-VIN to point-of-load power supply with front-end circuit protection reference design

This automotive point-of-load power supply reference design features complete front-end protection in a small overall solution size. The system can clamp fast high-voltage electrical transients and maintain operation through these events. It can also properly respond to a reverse battery polarity (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-050030 — 120W dual-stage matrix compatible automotive headlight ECU reference design

This reference design details a headlight ECU using an interleaved boost in voltage regulation mode feeding four synchronous buck channels. This design is also capable of matrix headlight control and is mounted to a heatsink and enclosure to emulate an automotive headlight ECU. The TPS92682-Q1 is (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01524 — Automotive High Efficiency Power Front End and Multi-Phase Processor Supply Reference Design

This processor supply reference design is an automotive power solution for use in highperformance, single-core-voltage application processors in advanced driver assistance systems (ADASs). This design can support core supply currents up to 10 A at 0.9 V. The design can also operate with a wide (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01492 — Integrated Power Front End and Multi-Phase Processor Supply Automotive Reference Design

This processor supply reference design is an automotive power solution for use in high performance, single-core-voltage application processors in advanced driver assistance systems (ADASs). This design can support core supply currents up to 10 A at 0.9 V. The design can also operate with a wide (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00804 — Automotive i.MX6 Quad Core Processor Power Reference Design

The TIDA-00804 reference design is a low-cost discrete power solution for the i.MX6Q quad core application processor. All the DCDC regulators operate at frequencies above the AM radio broadcast band to avoid interference with the radio and to provide a small solution size due to smaller filter (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP10652 — System-Level Reference Design for 30W ADAS System With Required Automotive Protections

PMP10652 is a System optimized (CISPR 25 Class 3) 30W design for Surround View ADAS system.

The design has various protections such as Load dump through TVS (ISO pulse testing), Reverse Voltage (Innovative Smart diode with very low Iq), Battery Disconnect Switch with OVP protection (PFET) and is EMI (...)

Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 20 Ultra Librarian
WQFN (RUM) 16 Ultra Librarian
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