ZHCSDQ2C January 2015 – September 2018 TPS7B7701-Q1 , TPS7B7702-Q1
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 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 Fault Detection and Protection
- 7.3.2 Short-Circuit and Overcurrent Protection
- 7.3.3 Short-to-Battery and Reverse Current Detection
- 7.3.4 Thermal Shutdown
- 7.3.5 Integrated Reverse-Polarity Protection
- 7.3.6 Integrated Inductive Clamp
- 7.3.7 Undervoltage Lockout
- 7.3.8 Enable (EN, EN1, and EN2)
- 7.3.9 Internal Voltage Regulator (VCC)
- 7.3.10 Current Sense Multiplexing
- 7.3.11 Adjustable Output Voltage (FB, FB1, and FB2)
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.7 Undervoltage Lockout
The device includes an undervoltage lockout (UVLO) threshold that is internally fixed. The undervoltage lockout activates when the input voltage on the IN pin drops below V(UVLO). The UVLO makes sure that the regulator is not latched into an unknown state during low input-supply voltage. If the input voltage has a negative transient that drops below the UVLO threshold and then recovers, the regulator shuts down and powers up with a normal power-up sequence when the input voltage is above the required levels.
Table 1. Fault Table
| FAILURE MODE | V(SENSE) | ERR | LDO SWITCH OUTPUT | LATCHED |
|---|---|---|---|---|
| Open load |  |
HIGH | Enabled | No |
| Normal | HIGH | Enabled | No | |
| Overcurrent | HIGH | Enabled | No | |
| Short-circuit or current limit | 2.4 to 2.65 V | LOW | Enabled | No |
| Thermal shutdown | 2.7 to 3 V | LOW | Disabled | No |
| Output short-to-battery | 3.05 to 3.3 V | LOW | Disabled | Yes |
| Reverse current | 3.05 to 3.3 V | LOW | Disabled | Yes |