LM26420-Q1

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 5.5 Vout (Min) (V) 0.8 Vout (Max) (V) 4.5 Iout (Max) (A) 2 Iq (Typ) (mA) 0.9 Switching frequency (Min) (kHz) 550 Switching frequency (Max) (kHz) 2200 Features Enable, Light Load Efficiency, Phase Interleaving, Power Good, Pre-Bias Start-Up, Synchronous Rectification Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 2 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 WQFN (RUM) 16 16 mm² 4 x 4 open-in-new Find other Buck converters (integrated switch)

Features

  • 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

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Description

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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LM26420 ACTIVE Dual 2 A, high-efficiency synchronous DC/DC converter This converter is not automotive qualified.

Technical documentation

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Type Title Date
* Datasheet LM26420-Q1 Dual 2-A, Automotive-Qualified, High-Efficiency Synchronous DC/DC Converter datasheet (Rev. B) May 18, 2020
Application notes LM26420-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Apr. 23, 2020
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
User guides Automotive Wide-VIN to Point-of-Load Power Supply Reference Design (Rev. A) Mar. 26, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles Build a sub-20W CISPR25 Class 5 power design for automotive infotainment processors May 02, 2017
Technical articles Spread Spectrum: Headache tablet or vitamin pill? May 18, 2015
User guides AN-1870 LM26420 Evaluation Board (Rev. B) Apr. 24, 2013
Application notes AN-1973 Benefits and Challenges of High-Frequency Regulators (Rev. A) Apr. 23, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description

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 (...)

Features
  • Input Voltage: 3V to 5.5V
  • Output Voltages: 1.2 VOUT1 and 2.5 VOUT2
  • Maximum load current: 2A/output
  • Minimum load current: 0A
  • Size: 1.35 in. x 1.6 in.
  • Peak Current Limit: approx= 3.2A at 25°C
  • Nominal Switching Frequency: 2.2 MHz
  • IC package eTSSOP

 

EVALUATION BOARDS Download
document-generic User guide
99
Description

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 (...)

Features
  • Input Voltage: 3V to 5.5V
  • Output Voltages: 1.2 VOUT1 and 2.5 VOUT2
  • Maximum load current: 2A/output
  • Minimum load current: 0A
  • Size: 1.35 in. x 1.6 in.
  • Peak Current Limit: approx= 3.2A at 25°C
  • Nominal Switching Frequency: 2.2 MHz
  • IC package LLP

 

EVALUATION BOARDS Download
499
Description
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 (...)
Features
  • Individually controlled 66 pixel LED frontlight solution
  • 3x12 AFLS/ADB LED Array
  • 1x12 Sequential Turn Light
  • 1X12 Daytime Running Light
  • 1X6 High Power Race Light
EVALUATION BOARDS Download
499
Description
The TPS92663EVM6-901 consists of 63 individually controllable LEDs configured into a six channel application. This evaluation module shows the versatility and configurability of the TPS92663-Q1 LED Matrix Manager Device. Using the companion control PCB, 6CHAUTOECU-899, and the TPS92663EVM Software (...)
Features
  • Individually controlled 63 pixel LED frontlight solution
  • 3x12 AFLS/ADB LED Array
  • 1x12 Sequential Turn Light
  • 1X12 Daytime Running Light
  • 1X3 High Power Race Light

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Automotive LED headlight driver module for halogen replacement reference design
TIDA-050040 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
17W System-Level Power Reference Design for Automotive Infotainment Processor Power
TIDA-00746 — 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. (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive wide-VIN to point-of-load power supply with front-end circuit protection reference design
PMP15023 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120W dual-stage matrix compatible automotive headlight ECU reference design
TIDA-050030 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive High Efficiency Power Front End and Multi-Phase Processor Supply Reference Design
TIDA-01524 — 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 input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Integrated Power Front End and Multi-Phase Processor Supply Automotive Reference Design
TIDA-01492 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive I.MX6 Quad Core Processor Power Solution Reference Design
PMP4442 The PMP4442 reference design is an low-cost discrete power solution to power I.MX6 quad core. All the DCDC regulators are running at 2MHz to avoid the AM band interference and provide low solution size. The first stage DCDC converter can support wide Vin range from 6V to 42V, which can support (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive i.MX6 Quad Core Processor Power Reference Design
TIDA-00804 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
System-Level Reference Design for 30W ADAS System With Required Automotive Protections
PMP10652 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 (...)

document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Switching Frequency Dual Synchronous Buck Regulator; 2.5V@1.0A and 1.8V@1.0A Reference Design
PMP8750 This design is a synchronous buck converter for automotive applications. It uses the LM26420XSQ to deliver two output voltage of 2.5V@1.0A and 1.8V@1.0A. The switching frequency is 2.2MHz.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options
WQFN (RUM) 16 View options

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