ZHCSM96A November 2020 – August 2021 TPS6521835
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1
Wake-Up and Power-Up and Power-Down Sequencing
- 7.3.1.1 Power-Up Sequencing
- 7.3.1.2 Power-Down Sequencing
- 7.3.1.3 Strobe 1 and Strobe 2
- 7.3.1.4 Supply Voltage Supervisor and Power-Good (PGOOD)
- 7.3.1.5 Backup Supply Power-Good (PGOOD_BU)
- 7.3.1.6 Internal LDO (INT_LDO)
- 7.3.1.7 Current Limited Load Switches
- 7.3.1.8 LDO1
- 7.3.1.9 Coin Cell Battery Voltage Acquisition
- 7.3.1.10 UVLO
- 7.3.1.11 Power-Fail Comparator
- 7.3.1.12 Battery-Backup Supply Power-Path
- 7.3.1.13 DCDC3 and DCDC4 Power-Up Default Selection
- 7.3.1.14 I/O Configuration
- 7.3.1.15 Push Button Input (PB)
- 7.3.1.16 AC_DET Input (AC_DET)
- 7.3.1.17 Interrupt Pin (INT)
- 7.3.1.18 I2C Bus Operation
- 7.3.1
Wake-Up and Power-Up and Power-Down Sequencing
- 7.4 Device Functional Modes
- 7.5 Register Maps
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
7.3.1.7.2 Load Switch 2 (LS2)
LS2 is a reverse-blocking, 5 V, low-impedance switch. Load switch 2 provides four different current limit values (100/200/500/1000 mA) that are selectable through LS2ILIM[1:0] bits. Overcurrent is reported through the LS2_I interrupt.
LS2 has its own input-undervoltage protection which forces the switch OFF if the switch input voltage (VIN_LS2) is <2.7 V. Similar to OTS, the LS2_F interrupt is set when the switch is held OFF by the local UVLO function, and the switch recovers automatically when the input voltage rises above the UVLO threshold.
Figure 7-12 Typical Application of Load Switch 2