Datasheet > IRU1117CPPBF

IRU1117CPPBF

更新时间： 2024-01-26 08:26:52

品牌	Logo	应用领域
英飞凌 - INFINEON		输出元件调节器
页数	文件大小	规格书
10页	137K
描述
Adjustable Positive LDO Regulator, 1.25V Min, 5.5V Max, 1.2V Dropout, PSSO2, PLASTIC, ULTRA THIN PACKAGE-3

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IRU1117CPPBF 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	MODULE
包装说明：	TO-252,	针数：	2
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.82
最大回动电压 1：	1.2 V	最大差分输入-输出电压：	7 V
最小差分输入-输出电压：	1.3 V	JESD-30 代码：	R-PSSO-G2
长度：	6.145 mm	功能数量：	1
端子数量：	2	工作温度TJ-Max：	150 °C
工作温度TJ-Min：		最大输出电流 1：	0.8 A
最大输出电压 1：	5.5 V	最小输出电压 1：	1.25 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	TO-252
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
调节器类型：	ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR	座面最大高度：	2.16 mm
表面贴装：	YES	端子形式：	GULL WING
端子节距：	2.285 mm	端子位置：	SINGLE
处于峰值回流温度下的最长时间：	40	宽度：	6.04 mm
Base Number Matches：	1

IRU1117CPPBF 数据手册

IRU1117(PbF)

Output Voltage Setting

to the load side, the effective resistance between the

The IRU1117can be programmed to any voltages in the regulator and the load is multiplied by the factor of (1+R2/

range of 1.25V to 5.5V with the addition of R1 and R2 R1), or the effective resistance will be R^P(eff)=RP3(1+R2/

external resistors according to the following formula:

R1). It is important to note that for high current applica-

tions, this can represent a significant percentage of the

overall load regulation and one must keep the path from

the regulator to the load as short as possible to mini-

mize this effect.

VOUT = VREF3 1+

+I^ADJ3R2

( )

Where:

PARASITIC LINE

RESISTANCE

VREF = 1.25V Typically

IADJ = 50µA Typically

VOUT

VIN

R1 and R2 as shown in Figure 3:

IRU1117

V^OUT

V^IN

VIN

VOUT

Adj

IRU1117

Adj

V^REF

I^ADJ= 50uA

Figure 4 - Schematic showing connection

for best load regulation.

Figure 3 - Typical application of the IRU1117

for programming the output voltage.

Stability

The IRU1117 requires the use of an output capacitor as

The IRU1117 keeps a constant 1.25V between the out- part of the frequency compensation in order to make the

put pin and the adjust pin. By placing a resistor R1 across regulator stable. Typical designs for microprocessor ap-

these two pins a constant current flows through R1, add- plications use standard electrolytic capacitors with a

ing to the I^ADJcurrent and into the R2 resistor producing typical ESR in the range of 50 to 100mς and an output

a voltage equal to the (1.25/R1)3R2 + IADJ3R2 which capacitance of 500 to 1000µF. Fortunately as the ca-

will be added to the 1.25V to set the output voltage. pacitance increases, the ESR decreases resulting in a

This is summarized in the above equation. Since the fixed RC time constant. The IRU1117 takes advantage

minimum load current requirement of the IRU1117 is of this phenomenon in making the overall regulator loop

10mA, R1 is typically selected to be 121ς resistor so stable. For most applications a minimum of 100µF alu-

that it automatically satisfies the minimum current re- minum electrolytic capacitor such as Sanyo MVGX se-

quirement. Notice that since IADJ is typically in the range ries, Panasonic FA series as well as the Nichicon PL

of 50µA it only adds a small error to the output voltage series insures both stability and good transient response.

and should only be considered when a very precise out-

put voltage setting is required. For example, in a typical Thermal Design

3.3V application where R1=121ς and R2=200ς the er- The IRU1117 incorporates an internal thermal shutdown

ror due to IADJ is only 0.3% of the nominal set point.

that protects the device when the junction temperature

exceeds the maximum allowable junction temperature.

Although this device can operate with junction tempera-

Load Regulation

Since the IRU1117 is only a three-terminal device, it is tures in the range of 1508C, it is recommended that the

not possible to provide true remote sensing of the output heat sink be selected such that during maximum con-

voltage at the load. Figure 4 shows that the best load tinuous load operation the junction temperature is kept

regulation is achieved when the bottom side of R2 is below this number. The example below for a SCSI termi-

connected to the load and the top side of R1 resistor is nator application shows the steps in selecting the proper

connected directly to the case or the VOUT pin of the regulator in a surface-mount package. (See IRU1015 for

regulator and not to the load. In fact, if R1 is connected non-surface-mount packages)

Rev. 1.8

www.irf.com

1 2 345 6 7...10

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