300-mA LDO. LM26480 Datasheet

LM26480 LDO. Datasheet pdf. Equivalent


Part LM26480
Description 1.5-A Buck Regulators and Dual 300-mA LDO
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LM26480
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
LM26480
SNVS543N – JANUARY 2008 – REVISED JUNE 2017
LM26480 Dual 2-MHz, 1.5-A Buck Regulators and Dual 300-mA LDOs
With Individual Enable and Power Good
1 Features
1 Input Voltage: 2.8 V to 5.5 V
• Compatible with Advanced Applications
Processors and FPGAs
• Two LDOs for Powering Internal Processor
Functions and I/Os
• Precision Internal Reference
• Thermal Overload Protection
• Current Overload Protection
• External Power-On-Reset Function for Buck1 and
Buck2
• Undervoltage Lockout Detector to Monitor Input
Supply Voltage
Step-Down DC-DC Converters (Buck)
– 1.5-A Output Current
– VOUT from:
– Buck1 : 0.8 V to 2 V at 1.5 A
– Buck2 : 1 V to 3.3 V at 1.5 A
– Up to 96% efficiency
– ±3% FB Voltage Accuracy
– 2-MHz PWM Switching Frequency
– PWM-to-PFM Automatic Mode Change Under
Low Loads
– Automatic Soft Start
Linear Regulators (LDO)
– VOUT of 1 V to 3.5 V
– ±3% FB Voltage Accuracy
– 300-mA Output Current
– 25-mV (Typical) Dropout
2 Applications
• Core Digital Power
• Applications Processors
• Peripheral I/O Power
• Digital Radios
• Robot Drives
• Image Transmission Module
• Low-Power Digital Applications
3 Description
The LM26480 is a multi-functional power
management unit (PMU), optimized for low-power
digital applications. This device integrates two highly
efficient 1.5-A step-down DC-DC converters and two
300-mA linear regulators. The DC-DC buck
converters provide typical efficiencies of 96%,
allowing for minimal power consumption. Features
include soft start, undervoltage lockout, current
overload protection, thermal overload protection, and
an internal power-on-reset (POR) circuit, which
monitors the output voltage levels on bucks 1 and 2.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM26480
WQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
0.47 µF
R1
R2
1 µF
1 µF
SYNC
ENLDO1
ENLDO2
ENSW1
ENSW2
VOUTLDO1
LDO1_FB
VINLDO1
VINLDO2
LM26480
VINLDO12
nPOR
VIN1
SW1
FB1
GND_SW1
1 µF
100 kŸ
10 µF
2.2 µH
C1 R1 10 µF
C2 R2
VIN2
10 µF
0.47 µF
VOUTLDO2
R1
LDO2_FB
R2
GND_L
GND_C
DAP
SW2
FB2
GND_SW2
2.2 µH
C1
C2
R1 10 µF
R2
AVDD
1 µF
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.



LM26480
LM26480
SNVS543N – JANUARY 2008 – REVISED JUNE 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Options....................................................... 4
6 Pin Configuration and Functions ......................... 5
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions: Bucks ........... 6
7.4 Thermal Information .................................................. 6
7.5 General Electrical Characteristics............................. 7
7.6 Low Dropout Regulators, LDO1 and LDO2 .............. 7
7.7 Buck Converters SW1, SW2..................................... 8
7.8 I/O Electrical Characteristics..................................... 9
7.9 Power On Reset Threshold/Function (POR)............. 9
7.10 Typical Characteristics — LDO............................. 10
7.11 Typical Characteristics — Buck 2.8 V to 5.5 V ..... 11
7.12 Typical Characteristics — Bucks 1 and 2 ............. 12
7.13 Typical Characteristics — Buck 3.6 V................... 13
8 Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 14
8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 22
9 Application and Implementation ........................ 23
9.1 Application Information............................................ 23
9.2 Typical Application ................................................. 25
10 Power Supply Recommendations ..................... 32
11 Layout................................................................... 32
11.1 Layout Guidelines ................................................. 32
11.2 Layout Example .................................................... 33
12 Device and Documentation Support ................. 34
12.1 Device Support .................................................... 34
12.2 Documentation Support ....................................... 34
12.3 Receiving Notification of Documentation Updates 34
12.4 Community Resources.......................................... 34
12.5 Trademarks ........................................................... 34
12.6 Electrostatic Discharge Caution ............................ 34
12.7 Glossary ................................................................ 34
13 Mechanical, Packaging, and Orderable
Information ........................................................... 34
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision M (December 2016) to Revision N
Page
• Deleted the maximum lead temperature (soldering) from the Absolute Maximum Ratings table .......................................... 6
• Changed the PBUCK1 and PBUCK2 equations in the Junction Temperature section........................................................ 26
• Changed the Electrostatic Discharge Caution statement .................................................................................................... 34
Changes from Revision L (June 2016) to Revision M
Page
• Changed title of data sheet; add content to Description section ............................................................................................ 1
• Deleted SQ-BF option from Table 1 ...................................................................................................................................... 4
Changes from Revision K (January 2015) to Revision L
Page
• Added additional items to Applications .................................................................................................................................. 1
• Changed "θn" to "eN" as symbol for supply output noise in Low Dropout Regulators EC table............................................. 7
Changes from Revision J (October 2014) to Revision K
Page
• Changed Handling Ratings table to ESD Ratings table ........................................................................................................ 6
• Added full Thermal Information values. .................................................................................................................................. 6
• Added additional paragraph to Functional Description subsection to describe enable signal. ............................................ 16
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