ZHCSES0C March 2016 – December 2022 LM5165-Q1
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 Integrated Power MOSFETs
- 7.3.2 Selectable PFM or COT Mode Converter Operation
- 7.3.3 COT Mode Light-Load Operation
- 7.3.4 Low Dropout Operation and 100% Duty Cycle Mode
- 7.3.5 Adjustable Output Voltage (FB)
- 7.3.6 Adjustable Current Limit
- 7.3.7 Precision Enable (EN) and Hysteresis (HYS)
- 7.3.8 Power Good (PGOOD)
- 7.3.9 Configurable Soft Start (SS)
- 7.3.10 Thermal Shutdown
- 7.4 Device Functional Modes
-
8 Applications and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1 Design 1: Wide VIN, Low IQ COT Converter Rated at 5 V, 150 mA
- 8.2.2 Design 2: Small Solution Size PFM Converter Rated at 3.3 V, 50 mA
- 8.2.3 Design 3: High Density 12-V, 75-mA PFM Converter
- 8.2.4 Design 4: 3.3-V, 150-mA COT Converter With High Efficiency
- 8.2.5 Design 5: 15-V, 150-mA, 600-kHz COT Converter
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- DRC|10
訂購信息
7.3.7 Precision Enable (EN) and Hysteresis (HYS)
The precision EN input supports adjustable input undervoltage lockout (UVLO) with hysteresis programmed independently through the HYS pin for application specific power-up and power-down requirements. EN connects to a comparator-based input referenced to a 1.212-V bandgap voltage with 68-mV hysteresis. An external logic signal can be used to drive the EN input to toggle the output on and off and for system sequencing or protection. The simplest way to enable the LM5165 operation is to connect EN directly to VIN. This allows the LM5165-Q1 to start up when VIN is within its valid operating range. However, many applications benefit from using a resistor divider RUV1 and RUV2 as shown in Figure 7-5 to establish a precision UVLO level. In tandem with the EN setting, use HYS to increase the voltage hysteresis as needed.
Use Equation 6 and Equation 7 to calculate the input UVLO voltages turnon and turnoff voltages, respectively.
There is also a low IQ shutdown mode when EN is pulled below a base-emitter voltage drop (approximately 0.6 V at room temperature). If EN is below this hard shutdown threshold, the internal LDO regulator powers off and the internal bias supply rail collapses, shutting down the bias currents of the LM5165-Q1. The LM5165-Q1 operates in standby mode when the EN voltage is between the hard shutdown and precision enable thresholds.