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參數(shù)資料
| 型號(hào)： | TPS72215DBVR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW INPUT VOLTAGE, CAP FREE 50-mA LOW-DROPOUT LINEAR REGULATORS |
| 中文描述： | 低輸入電壓，第免費(fèi)50毫安低壓降線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 119K |
| 代理商： | TPS72215DBVR |
TPS72201, TPS72215
TPS72216, TPS72218
SLVS390B
–
DECEMBER 2001
–
REVISED MAY 2002
www.ti.com
7
APPLICATION INFORMATION
The TPS722xx family of low-dropout (LDO) regulators functions with a very low input voltage (>1.8 V). The dropout voltage
is typically 50 mV at full load. Typical quiescent current (ground pin current) is only 85
μ
A and drops to 1
μ
A in the shutdown
mode.
DEVICE OPERATION
The TPS722xx 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
μ
A. EN may be tied
to V
IN
in applications where the shutdown feature is not used.
Current limiting 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
increasing the output current. The thermal protection shuts the regulator off if the junction temperature rises above 170
°
C.
Recovery is automatic when the junction temperature drops approximately 20
°
C below the high temperature trip point. 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.
NC
OUT
1
3
IN
EN
GND
2
4
5
VI
VO
0.1
μ
F
+
TPS722xx
0.1
μ
F
Figure 16. Typical Application Circuit
DUAL SUPPLY APPLICATION
In portable, battery-powered electronics, separate power rails for the DSP or microcontroller core voltage (V
CORE
) and I/O
peripherals (V
IO
) are usually necessary. The TPS721xx family of LDO linear regulators is ideal for providing V
(CORE)
for
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
of their useful lives. Therefore, a boost converter is necessary to provide the typical 3.3 V needed for V
IO
, and the TPS72115
linear regulator provides a regulated V
(CORE)
voltage, which in this example is 1.5 V. Although there is no explicit circuitry
to perform power-up sequencing of first V
(CORE)
then V
IO
, the output of the linear regulator reaches its regulated voltage
much faster (<400
μ
s) 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
I
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS72215DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72215DBVT | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72215DBVTG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72216DBVR | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS72216DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise Low Input Voltage 50mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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