300-mA LDO. LM26480-Q1 Datasheet

LM26480-Q1 LDO. Datasheet pdf. Equivalent


Part LM26480-Q1
Description 1.5-A Buck Regulators and Dual 300-mA LDO
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LM26480-Q1
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
LM26480-Q1
SNVSA58C – JANUARY 2015 – REVISED NOVEMBER 2017
LM26480-Q1 Dual 2-MHz, 1.5-A Buck Regulators and Dual 300-mA LDOs
With Individual Enable and Power Good for Automotive Applications
1 Features
1 Qualified for Automotive Applications
• AEC Q100-Qualified With the Following Results
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
Range
• 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
3 Description
The LM26480-Q1 is an automotive-qualified 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-Q1
WQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
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-Q1
LM26480-Q1
SNVSA58C – JANUARY 2015 – REVISED NOVEMBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Tables................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions: Bucks ........... 5
7.4 Thermal Information .................................................. 5
7.5 General Electrical Characteristics............................. 6
7.6 Low Dropout Regulators, LDO1 and LDO2 .............. 6
7.7 Buck Converters SW1, SW2..................................... 7
7.8 I/O Electrical Characteristics..................................... 8
7.9 Power On Reset Threshold/Function (POR)............. 8
7.10 Typical Characteristics — LDO............................... 9
7.11 Typical Characteristics — Buck 2.8 V to 5.5 V ..... 10
7.12 Typical Characteristics — Bucks 1 and 2 ............. 11
7.13 Typical Characteristics — Buck 3.6 V................... 12
8 Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 13
8.3 Feature Description................................................. 14
8.4 Device Functional Modes........................................ 21
9 Application and Implementation ........................ 22
9.1 Application Information............................................ 22
9.2 Typical Application ................................................. 24
10 Power Supply Recommendations ..................... 31
11 Layout................................................................... 31
11.1 Layout Guidelines ................................................. 31
11.2 Layout Example .................................................... 32
12 Device and Documentation Support ................. 33
12.1 Device Support .................................................... 33
12.2 Documentation Support ....................................... 33
12.3 Receiving Notification of Documentation Updates 33
12.4 Community Resources.......................................... 33
12.5 Trademarks ........................................................... 33
12.6 Electrostatic Discharge Caution ............................ 33
12.7 Glossary ................................................................ 33
13 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
Changes from Revision B (December 2016) to Revision C
Page
• Deleted the maximum lead temperature (soldering) from the Absolute Maximum Ratings table .......................................... 5
• Changed the PBUCK1 and PBUCK2 equations in the Junction Temperature section........................................................ 25
• Changed the Electrostatic Discharge Caution statement .................................................................................................... 33
Changes from Revision A (June 2016) to Revision B
Page
• Changed data sheet title; add content to Description section ............................................................................................... 1
Changes from Original (January 2016) to Revision A
Page
• Added top navigator icon ....................................................................................................................................................... 1
• Changed "θn" to "eN" as symbol for supply output noise in Low Dropout Regulators EC table............................................. 6
2 Submit Documentation Feedback
Product Folder Links: LM26480-Q1
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