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TPS79801-Q1 参数 Datasheet PDF下载

TPS79801-Q1图片预览
型号: TPS79801-Q1
PDF下载: 下载PDF文件 查看货源
内容描述: 50毫安, 3 V至50 V ,微功耗,低压差线性稳压器 [50 mA, 3 V TO 50 V, MICROPOWER, LOW-DROPOUT LINEAR REGULATOR]
分类和应用: 稳压器
文件页数/大小: 21 页 / 591 K
品牌: TI [ TEXAS INSTRUMENTS ]
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TPS79801-Q1, TPS79850-Q1  
www.ti.com  
SLVS822D MARCH 2009REVISED AUGUST 2011  
APPLICATION INFORMATION  
The TPS798xx is a 50-mA high-voltage LDO regulator with micropower quiescent current and shutdown. The  
device is capable of supplying 50 mA at a dropout voltage of 300 mV (typ). The low operating quiescent current  
(40 μA) drops to 1 μA in shutdown. In addition to the low quiescent current, the TPS798xx incorporates several  
protection features that make it ideal for battery-powered applications.  
The device is protected against both reverse-input and reverse-output voltages. In battery-backup applications,  
where the output can be held up by a backup battery when the input is pulled to ground, the TPS798xx acts as if  
it has a diode in series with its output and prevents reverse current flow. Figure 16 and Figure 17 illustrate two  
typical applications.  
RETURN  
IN  
OUT  
TPS79801  
1mF  
1mF  
FB  
EN  
OFF  
ON  
GND  
RSET  
-48V  
Note: ILED = 1.275 V/RSET  
48 V can vary from 4 V to 50 V  
Figure 16. Constant Brightness for Indicator LED Over Wide Input Voltage Range  
RP  
IN  
OUT  
TPS79801  
Load  
VIN  
FB  
EN  
GND  
Figure 17. Kelvin Sense Connection  
Adjustable Operation  
The TPS798xx has an output voltage range of 1.275 V to 28 V. The output voltage is set by the ratio of two  
external resistors as shown in Figure 18. The feedback loop monitors the output to maintain the voltage at the  
adjust pin at 1.275 V referenced to ground. The current in R1 is then equal to 1.275 V/R1, and the current in R2 is  
the current in R1 plus the FB pin bias current. The FB pin bias current, 0.2 μA at 25°C, flows through R2 into the  
FB pin. The output voltage can be calculated using the formula in Figure 18. The value of R1 should be less than  
250 kto minimize errors in the output voltage caused by the FB pin bias current. Note that in shutdown, the  
output is turned off and the divider current is zero.  
VOUT  
IN  
OUT  
R2  
C1  
VIN  
TPS79801  
EN  
FB  
GND  
R1  
VOUT = 1.275 V (1 + R2 / R1) + IFBR2  
VFB = 1.275 V  
IFB = 0.2 µA at 25°C  
Output Range = 1.275 V to 28 V  
Figure 18. Adjustable Operation  
Copyright © 20092011, Texas Instruments Incorporated  
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