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TPS72116DBVT

更新时间： 2024-01-04 10:23:06

品牌	Logo	应用领域
德州仪器 - TI		稳压器输入元件
页数	文件大小	规格书
14页	202K
描述
LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS

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TPS72116DBVT 数据手册

TPS72101, TPS72115

TPS72116, TPS72118

www.ti.com

SLVS352B – DECEMBER 2001 – REVISED MAY 2002

APPLICATION INFORMATION

TheTPS721xxfamilyoflow-dropout(LDO)regulatorsfunctionswithaverylowinputvoltage(>1.8V). Thedropoutvoltage

is typically 150 mVatfullload.Typicalquiescentcurrent(groundpincurrent)isonly85µAanddropsto1µAintheshutdown

mode.

DEVICE OPERATION

TheTPS721xx family can be operated at low input voltages due to low voltage circuit design techniques and a PMOS pass

element that exhibits low dropout.

A logic low on the enable input, EN, shuts off the output and reduces the supply current to less than 1 µA. EN may be tied

to V in applications where the shutdown feature is not used.

Currentlimiting and thermal protection prevent damage by excessive output current and/or power dissipation. The device

switches into a constant-current mode at approximately 350 mA; further load reduces the output voltage instead of

increasingthe output current. The thermal protection shuts the regulator off if the junction temperature rises above 170°C.

Recoveryisautomaticwhenthejunctiontemperaturedropsapproximately20°Cbelowthehightemperaturetrippoint. The

PMOS pass element includes a back diode that safely conducts reverse current when the input voltage level drops below

the output voltage level.

A typical application circuit is shown in Figure 16.

TPS721xx

OUT

0.1 µF

GND

Figure 16. Typical Application Circuit

DUAL SUPPLY APPLICATION

In portable, battery-powered electronics, separate power rails for the DSP or microcontroller core voltage (V

) and I/O

CORE

peripherals (V ) are usually necessary. The TPS721xx family of LDO linear regulators is ideal for providing V

for

(CORE)

the DSP or microcontroller. As shown in Figure 17, two AAA batteries provide an input voltage to a boost converter and

the TPS72115 LDO linear regulator. The batteries combine input voltage ranges from 3.0 V down to 1.8 V near the end

oftheirusefullives.Therefore,aboostconverterisnecessarytoprovidethetypical3.3VneededforV ,andtheTPS72115

linear regulator provides a regulated V

voltage, which in this example is 1.5 V. Although there is no explicit circuitry

(CORE)

to perform power-up sequencing of first V

then V , the output of the linear regulator reaches its regulated voltage

(CORE)

muchfaster (<400 µs) than the output of any switching type boost converter due to the inherent slow start up of those types

of converters. Assuming a boost converter with minimum V of 1.8 V is appropriately chosen, this power supply solution

can be used over the entire life of the two off-the-shelf AAA batteries. Thus, this solution is very efficient and the design

time and overall cost of the solution is minimized.

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TPS72116DBVTG4	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格
TPS72118	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格
TPS72118DBVR	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格
TPS72118DBVRG4	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格
TPS72118DBVT	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格
TPS72118DBVTG4	TI	LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS	获取价格

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