DC/DC Converter. LM26420 Datasheet

LM26420 Converter. Datasheet pdf. Equivalent


Part LM26420
Description High-Efficiency Synchronous DC/DC Converter
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LM26420 Dual 2.0A, High Frequency Step-Down DC-DC Regulator LM26420 Datasheet
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LM26420
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
LM26420
SNVS579L – FEBRUARY 2009 – REVISED MAY 2018
LM26420 Dual 2-A, High-Efficiency Synchronous
DC/DC Converter
1 Features
1 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
• High Switching Frequency: 2.2 MHz (LM26420X)
0.55 MHz (LM26420Y)
• 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 With
the WEBENCH® Power Designer
2 Applications
• Local 5 V to Vcore of FPGAs
• Core Power in HDDs and Set-Top Boxes
• USB Powered Devices
• Powering Core and I/O Voltages for CPUs and
ASICs
space
LM26420 Dual Buck DC/DC Converter
VIN
3 V to 5.5 V
VIN
Buck 1
VOUT1
2.5 V/2 A
PG1
EN1
SW1
PG2
EN2
SW2
Buck 2
VOUT2
1.2 V/2 A
FB1 FB2
GND
3 Description
The LM26420 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 utilizes current-mode control and internal
compensation to provide high performance regulation
over a wide range of operating conditions.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM26420
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%)
Copyright © 2016, Texas Instruments Incorporated
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
LM26420
SNVS579L – FEBRUARY 2009 – REVISED MAY 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings (LM26420X/Y) .................................... 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics Per Buck ........................... 7
6.6 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Applications ............................................... 19
9 Power Supply Recommendations...................... 32
10 Layout................................................................... 32
10.1 Layout Guidelines ................................................. 32
10.2 Layout Example .................................................... 33
10.3 Thermal Considerations ........................................ 33
11 Device and Documentation Support ................. 36
11.1 Device Support...................................................... 36
11.2 Documentation Support ........................................ 36
11.3 Receiving Notification of Documentation Updates 36
11.4 Community Resources.......................................... 36
11.5 Trademarks ........................................................... 36
11.6 Electrostatic Discharge Caution ............................ 37
11.7 Glossary ................................................................ 37
12 Mechanical, Packaging, and Orderable
Information ........................................................... 37
4 Revision History
Changes from Revision K (April 2016) to Revision L
Page
• Split automotive data sheet to separate document (SNVSB35) and remove automotive-specific content from
SNVS579 ............................................................................................................................................................................... 1
• Added links for WEBENCH .................................................................................................................................................... 1
Changes from Revision J (September 2015) to Revision K
Page
• Changed RθJA value from 35°C/W to 38.5°C/W for PWP package and from 40°C/W to 36.2°C/W; replaced RθJC
values with 2 new rows (and new values); added additional thermal values......................................................................... 6
• Changed "C1" to "C2" on Figure 42 ..................................................................................................................................... 20
• Changed "C1" to "C2" on Figure 51 ..................................................................................................................................... 29
• Deleted "C7" and "C8" from Table 6 ................................................................................................................................... 30
Changes from Revision I (June 2015) to Revision J
Page
• fixed error in WQFN Pin Functions - shifted "Description" column down one row and added back description for
VIND1 pin ................................................................................................................................................................................ 4
• Changed reference from "Typical Applications" to "Table 1". ............................................................................................. 22
• Deleted definition for RDS (not part of equation 15) ............................................................................................................. 22
Changes from Revision H (August 2014) to Revision I
Page
• Changed "Frequency" to "Efficiency" in title; add new Feature bullet re: CISPR25............................................................... 1
• Changed moved Storage temperature to Absolute Maximum Ratings table ......................................................................... 6
• Changed figure 36 caption .................................................................................................................................................. 13
• Added part number to caption wording ................................................................................................................................ 14
• Added application note ........................................................................................................................................................ 16
• Changed title of Thermal Guidelines to Thermal Considerations and moved the section to the correct location................ 33
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Product Folder Links: LM26420
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