SNVSB03D
December 2018 – January 2020
TPS3840
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Application Circuit
TPS3840 Typical Supply Current
4
Revision History
5
Device Comparison
6
Pin Configuration and Functions
Pin 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
Input Voltage (VDD)
8.3.1.1
VDD Hysteresis
8.3.1.2
VDD Transient Immunity
8.3.2
User-Programmable Reset Time Delay
8.3.3
Manual Reset (MR) Input
8.3.4
Output Logic
8.3.4.1
RESET Output, Active-Low
8.3.4.2
RESET Output, Active-High
8.4
Device Functional Modes
8.4.1
Normal Operation (VDD > VDD(min))
8.4.2
VDD Between VPOR and VDD(min)
8.4.3
Below Power-On-Reset (VDD < VPOR)
9
Application and Implementation
9.1
Application Information
9.2
Typical Application
9.2.1
Design 1: Dual Rail Monitoring with Power-Up Sequencing
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.3
Application Curves
9.2.2
Design 2: Battery Voltage and Temperature Monitor
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.3
Design 3: Fast Start Undervoltage Supervisor with Level-shifted Input
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.4
Design 4: Voltage Monitor with Back-up Battery Switchover
9.2.4.1
Design Requirements
9.2.4.2
Detailed Design Procedure
9.2.5
Application Curve: TPS3840EVM
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Device Nomenclature
12.2
Support Resources
12.3
Trademarks
12.4
Electrostatic Discharge Caution
12.5
Glossary
13
Mechanical, Packaging, and Orderable Information
7.7
Typical Characteristics
Typical characteristics show the typical performance of the TPS3840 device. Test conditions are T
J
= 25°C, V
DD
= 3.3 V, R
pull-up
= 100 kΩ, C
Load
= 50 pF, unless otherwise noted.
Figure 7.
Supply Current vs Supply Voltage for TPS3840DL49
Figure 9.
Supply Current vs Supply Voltage for TPS3840PH49
Figure 11.
Negative-going Input Threshold Accuracy over Temperature for TPS3840PLXX
Figure 13.
Input Threshold V
IT-
Hysteresis Accuracy for TPS3840DLXX
Figure 15.
Input Threshold V
IT-
Hysteresis Accuracy for TPS3840PHXX
Figure 17.
Output Voltage vs Input Voltage for TPS3840PL49
Figure 19.
Low Level Output Voltage vs I
RESET
for TPS3840DL49
Figure 21.
Low Level Output Voltage vs I
RESET
for TPS3840PL49
Figure 23.
Low Level Output Voltage vs I
RESET
for TPS3840PH49
Figure 25.
High Level Output Voltage vs I
RESET
for TPS3840PL49
Figure 27.
High Level Output Voltage vs I
RESET
for TPS3840PH49
Figure 29.
Manual Reset Logic Low Voltage Threshold over Temperature for TPS3840DLXX
Figure 31.
Manual Reset Logic Low Voltage Threshold over Temperature for TPS3840PHXX
Figure 33.
Manual Reset Logic High Voltage Threshold over Temperature for TPS3840PLXX
Figure 35.
Glitch Immunity on V
IT-
vs Overdrive (Data Taken with TPS3840PL28)
Figure 37.
Startup Delay over Temperature
Figure 39.
Reset Time Delay vs Capacitor Value (Data Taken with TPS3840PL16)
Figure 41.
Reset Time Delay vs Large Capacitor Values (Data Taken with TPS3840PL16)
Figure 43.
Propagation Time Delay from
MR
Asserted to Reset over Temperature
Figure 8.
Supply Current vs Supply Voltage for TPS3840PL49
Figure 10.
Negative-going Input Threshold Accuracy over Temperature for TPS3840DLXX
Figure 12.
Negative-going Input Threshold Accuracy over Temperature for TPS3840PHXX
Figure 14.
Input Threshold V
IT-
Hysteresis Accuracy for TPS3840PLXX
Figure 16.
Output Voltage vs Input Voltage for TPS3840DL49
Figure 18.
Output Voltage vs Input Voltage for TPS3840PH49
Figure 20.
Low Level Output Voltage vs V
DD
for TPS3840DL49
Figure 22.
Low Level Output Voltage vs VDD for TPS3840PL49
Figure 24.
Low Level Output Voltage vs VDD for TPS3840PH49
Figure 26.
High Level Output Voltage over Temperature for TPS3840PL49
Figure 28.
High Level Output Voltage over Temperature for TPS3840PH49
Figure 30.
Manual Reset Logic Low Voltage Threshold over Temperature for TPS3840PLXX
Figure 32.
Manual Reset Logic High Voltage Threshold over Temperature for TPS3840DLXX
Figure 34.
Manual Reset Logic High Voltage Threshold over Temperature for TPS3840PHXX
Figure 36.
CT Pin Internal Resistance over Temperature
Figure 38.
Reset Time Delay with No Capacitor over Temperature
Figure 40.
Reset Time Delay vs Small Capacitor Values (Data Taken with TPS3840PL16)
Figure 42.
Propagation Detect Time Delay for VDD Falling Below V
IT-
(High-to-Low) over Temperature
Figure 44.
Propagation Time Delay from
MR
Release to Deasserted Reset over Temperature