JAJSN68A october   2006  – may 2023 TLV3011-EP , TLV3012-EP

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 6.1  Absolute Maximum Ratings - TLV3011-EP
    2. 6.2  Absolute Maximum Ratings - TLV3012-EP
    3. 6.3  ESD Ratings
    4. 6.4  Thermal Resistance Characteristics
    5. 6.5  Recommended Operating Conditions - TLV3011-EP
    6. 6.6  Recommended Operating Conditions - TLV3012-EP
    7. 6.7  Electrical Characteristics - TLV3011-EP
    8. 6.8  Electrical Characteristics - TLV3012-EP
    9. 6.9  Switching Characteristics - TLV3012-EP
    10. 6.10 Typical Characteristics - TLV3011-EP
    11. 6.11 Typical Characteristics - TLV3012-EP
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Open Drain Output (TLV3011-EP)
      2. 7.4.2 Push Pull Output (TLV3012-EP)
      3. 7.4.3 Voltage Reference
      4. 7.4.4 Fail-Safe Input (TLV3012-EP Only)
      5. 7.4.5 Power-On Reset (POR) (TLV3012-EP Only)
  9. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Hysteresis
    2. 8.2 Typical Application
      1. 8.2.1 Under Voltage Detection
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Performance Plots
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. Device and Documentation Support
    1. 9.1 ドキュメントの更新通知を受け取る方法
    2. 9.2 サポート・リソース
    3. 9.3 Trademarks
    4. 9.4 静電気放電に関する注意事項
    5. 9.5 用語集
  11. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ(パッケージ|ピン)
  • DBV|6
サーマルパッド・メカニカル・データ
発注情報

Detailed Design Procedure

Configure the circuit as shown in Figure 8-3. Connect (V+) to VBAT which also powers the microcontroller. Resistors R1 and R2 create the under-voltage alert level of 2.0 V. When the battery voltage sags down to 2.0 V, the resistor divider voltage crosses VREF, the 1.242 V reference threshold of the TLV3012-EP. This causes the comparator output to transition from a logic high to a logic low. The push-pull output of the TLV3012-EP is selected since the comparator operating voltage is shared with the microcontroller which is receiving the under-voltage alert signal.

Equation 1 is derived from the analysis of Figure 8-3.

Equation 1. GUID-BF73EAE3-28A3-4D37-9E64-671E1617EBF6-low.gif

where

  • R1 and R2 are the resistor values for the resistor divider connected to IN+
  • VBAT is the voltage source that is being monitored for an undervoltage condition.
  • VREF is the falling edge threshold where the comparator output changes state from high to low

Rearranging Equation 1 and solving for R1 yields Equation 2.

Equation 2. GUID-C276625F-6072-4AC1-88DF-9AE113AC3EF2-low.gif

For the specific undervoltage detection of 2.0 V using the TLV3012-Q1, the following results are calculated.

Equation 3. GUID-8D580C3A-0B98-43CD-B71B-40917E3FB5D2-low.gif

where:

  • R2 is set to 1 MΩ
  • VBAT is set to 2.0 V
  • VREF is set to1.242 V

Choose RTOTAL (R1 + R2) such that the current through the divider is at least 100 times higher than the input bias current (IBIAS). The resistors can have high values to minimize current consumption in the circuit without adding significant error to the resistive divider.