基于TLV704的24V 输入电压、150mA、超低·IQ 低压降稳压器

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　　描述

　　The TLV704 series of low-dropout (LDO) regulators are ultralow quiescent current devices designed for extremely power-sensitive applications. Quiescent current is virtually constant over the complete load current and ambient temperature range. These devices are an ideal power-management attachment to low-power microcontrollers, such as the MSP430.

　　The TLV704 operates over a wide operating input voltage of 2.5 V to 24 V. Thus, the device is an excellent choice for both battery-powered systems as well as industrial applications that undergo large line transients.

　　The TLV704 is available in a 3-mm × 3-mm SOT23-5 package, which is ideal for cost-effective board manufacturing.

　　特性

　　Wide Input Voltage Range: 2.5 V to 24 V

　　Low 3.2-µA Quiescent Current

　　Ground Pin Current: 3.4 µA at 100-mA IOUT

　　Stable With a Low-ESR, 1-µF Typical Output Capacitor

　　Operating Junction Temperature: –40°C to 125°C

　　Available in SOT23-5 Package

　　See Package Option Addendum at end of this

　　document for complete list of available voltage options

　　APPLICATIONS

　　Ultralow Power Microcontrollers

　　E-Meters

　　Fire Alarms and Smoke Detector Systems

　　Handset Peripherals

　　Industrial and Automotive Applications

　　Remote Controllers

　　Zigbee® Networks

　　Portable, Battery-Powered Equipment

　　Applications

　　Ultralow Power Microcontrollers

　　E-Meters

　　Fire Alarms and Smoke Detector Systems

　　Handset Peripherals

　　Industrial and Automotive Applications

　　Remote Controllers

　　Zigbee® Networks

　　Portable, Battery-Powered Equipment

　　7 Detailed Description

　　7.1 Overview

　　The TLV704 series belong to a family of ultralow IQ LDO regulators. IQ remains fairly constant over the complete output load current and temperature range. The devices are ensured to operate over a temperature range of –40°C to 125°C.

　　7.2 Functional Block Diagram

　　7.3 Feature Description

　　7.3.1 Regulator Protection

　　The TLV704 series of LDO regulators use a PMOS-pass transistor that has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting is appropriate.

　　The TLV704 features internal current limiting. During normal operation, the TLV704 limits output current to approximately 250 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. Do not exceed the rated maximum operating junction temperature of 125°C. Continuously running the device under conditions where the junction temperature exceeds 125°C degrades device reliability.

　　The ability to remove heat from the die is different for each package type, presenting different considerations in the printed circuit board (PCB) layout. The PCB area around the device that is free of other components moves the heat from the device to the ambient air. Performance data for JEDEC high-K boards are given in the Thermal Information table. Using heavier copper increases the effectiveness in removing heat from the device. The addition of plated through-holes to heat-dissipating layers also improves heatsink effectiveness. Power dissipation depends on input voltage and load conditions. Power dissipation (PD) is equal to the product of the output current and the voltage drop across the output pass element, as shown in Equation 2.

　　7.4 Device Functional Modes

　　7.4.1 Normal Operation

　　The device regulates to the nominal output voltage under the following conditions:

　　The input voltage is greater than the nominal output voltage added to the dropout voltage.

The output current is less than the current limit.

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　　7.4.2 Dropout Operation

　　If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other conditions are met for normal operation, the device operates in dropout mode. In this condition, the output voltage is the same the input voltage minus the dropout voltage. The transient performance of the device is significantly degraded because the pass device is in a triode state and no longer controls the current through the LDO. Line or load transients in dropout may result in large output voltage deviations.

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