DC/DC Converter. LM26420-Q1 Datasheet

LM26420-Q1 Converter. Datasheet pdf. Equivalent


Part LM26420-Q1
Description High-Efficiency Synchronous DC/DC Converter
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LM26420-Q1
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LM26420-Q1
SNVSB35B – MAY 2018 – REVISED JUNE 2020
LM26420-Q1 Dual 2-A, Automotive-Qualified, High-Efficiency Synchronous
DC/DC Converter
1 Features
1 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
Documentation available to aid functional
safety system design
• 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
LM26420 Dual Buck DC/DC Converter
VIN
3 V to 5.5 V
VIN
VOUT1
2.5 V/2 A
Buck 1
PG1
PG2
EN1
EN2
LM26420
SW1
SW2
FB1
FB2
GND
Buck 2
VOUT2
1.2 V/2 A
2 Applications
Automotive infotainment & cluster
Advanced driver assistance systems (ADAS)
3 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM26420-Q1
HTSSOP (20)
WQFN (16)
6.50 mm × 4.40 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
LM26420 Efficiency (Up to 93%)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



LM26420-Q1
LM26420-Q1
SNVSB35B – MAY 2018 – REVISED JUNE 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings ............................................................ 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics Per Buck ........................... 6
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ............................................... 18
9 Power Supply Recommendations...................... 28
10 Layout................................................................... 28
10.1 Layout Guidelines ................................................. 28
10.2 Layout Example .................................................... 29
10.3 Thermal Considerations ........................................ 29
11 Device and Documentation Support ................. 32
11.1 Device Support...................................................... 32
11.2 Documentation Support ........................................ 32
11.3 Receiving Notification of Documentation Updates 32
11.4 Support Resources ............................................... 32
11.5 Trademarks ........................................................... 32
11.6 Electrostatic Discharge Caution ............................ 32
11.7 Glossary ................................................................ 33
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (July 2019) to Revision B
Page
• Added functional safety bullet in the Features ....................................................................................................................... 1
Changes from Original (May 2018) to Revision A
Page
• Updated Power Supply Recommendations ......................................................................................................................... 28
2
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