SLDS261A
November 2019 – February 2021
TPS6521815
PRODUCTION DATA
1
Features
2
Applications
3
Description
3.1
Simplified Schematic
4
Revision History
5
Description (continued)
6
Pin Configuration and Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Requirements
7.7
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Wake-Up and Power-Up and Power-Down Sequencing
8.3.1.1
Power-Up Sequencing
8.3.1.2
Power-Down Sequencing
8.3.1.3
Strobe 1 and Strobe 2
8.3.1.4
Supply Voltage Supervisor and Power-Good (PGOOD)
8.3.1.5
Backup Supply Power-Good (PGOOD_BU)
8.3.1.6
Internal LDO (INT_LDO)
8.3.1.7
Current Limited Load Switches
8.3.1.7.1
Load Switch 1 (LS1)
8.3.1.7.2
Load Switch 2 (LS2)
8.3.1.7.3
Load Switch 3 (LS3)
8.3.1.8
LDO1
8.3.1.9
Coin Cell Battery Voltage Acquisition
8.3.1.10
UVLO
8.3.1.11
Power-Fail Comparator
8.3.1.12
Battery-Backup Supply Power-Path
8.3.1.13
DCDC3 and DCDC4 Power-Up Default Selection
8.3.1.14
I/O Configuration
8.3.1.14.1
Configuring GPO2 as Open-Drain Output
8.3.1.14.2
Using GPIO3 as Reset Signal to DCDC1 and DCDC2
8.3.1.15
Push Button Input (PB)
8.3.1.15.1
Signaling PB-Low Event on the nWAKEUP Pin
8.3.1.15.2
Push Button Reset
8.3.1.16
AC_DET Input (AC_DET)
8.3.1.17
Interrupt Pin (INT)
8.3.1.18
I2C Bus Operation
8.4
Device Functional Modes
8.4.1
Modes of Operation
8.4.2
OFF
8.4.3
ACTIVE
8.4.4
SUSPEND
8.4.5
RESET
8.5
Programming
8.5.1
Programming Power-Up Default Values
8.6
Register Maps
9
Application and Implementation
9.1
Application Information
9.1.1
Applications Without Backup Battery
9.1.2
Applications Without Battery Backup Supplies
9.2
Typical Application
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Output Filter Design
9.2.2.2
Inductor Selection for Buck Converters
9.2.2.3
Output Capacitor Selection
9.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Documentation Support
12.1.1
Related Documentation
12.2
Receiving Notification of Documentation Updates
12.3
Support Resources
12.4
Trademarks
12.5
Electrostatic Discharge Caution
12.6
Glossary
13
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RSL|48
MPQF193A
Thermal pad, mechanical data (Package|Pins)
RSL|48
QFND155N
Orderable Information
slds261a_oa
slds261a_pm
8.4.1
Modes of Operation
PB (↓) has 50 ms debounce.
AC_DET (↓) has 10 ms debounce.
(↓) = denotes falling edge of signal.
Figure 8-34
Modes of Operation Diagram