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RT9013-12GB 参数 Datasheet PDF下载

RT9013-12GB图片预览
型号: RT9013-12GB
PDF下载: 下载PDF文件 查看货源
内容描述: 500mA,低压差,低噪声超快速无旁路电容的CMOS LDO稳压器 [500mA, Low Dropout, Low Noise Ultra-Fast Without Bypass Capacitor CMOS LDO Regulator]
分类和应用: 稳压器
文件页数/大小: 12 页 / 301 K
品牌: RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
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Preliminary  
RT9013  
Applications Information  
Enable  
The RT9013 goes into sleep mode when the EN pin is in a  
logic low condition. During this condition, the RT9013 has  
an ENpin to turn on or turn off regulator, When the ENpin  
is logic hight, the regulator will be turned on. The supply  
current to 0.7μA typical. The EN pin may be directly tied  
to VIN to keep the part on. The Enable input is CMOS  
logic and cannot be left floating.  
Like any low-dropout regulator, the external capacitors used  
with the RT9013 must be carefully selected for regulator  
stability and performance. Using a capacitor whose value  
is > 1μF on the RT9013 input and the amount of capacitance  
can be increased without limit. The input capacitor must  
be located a distance of not more than 0.5 inch from the  
input pin of the IC and returned to a clean analog ground.  
Any good quality ceramic can be used for this capacitor.  
The capacitor with larger value and lower ESR (equivalent  
series resistance) provides better PSRR and line-transient  
response.  
PSRR  
The power supply rejection ratio (PSRR) is defined as the  
gain from the input to output divided by the gain from the  
supply to the output. The PSRR is found to be  
The output capacitor must meet both requirements for  
minimum amount of capacitance and ESR in all LDOs  
application. The RT9013 is designed specifically to work  
with low ESR ceramic output capacitor in space-saving  
and performance consideration. Using a ceramic capacitor  
whose value is at least 1μF with ESR is > 20mΩ on the  
RT9013 output ensures stability. The RT9013 still works  
well with output capacitor of other types due to the wide  
stable ESR range. Figure 1. shows the curves of allowable  
ESR range as a function of load current for various output  
capacitor values. Output capacitor of larger capacitance  
can reduce noise and improve load transient response,  
stability, and PSRR. The output capacitor should be located  
not more than 0.5 inch from the VOUT pin of the RT9013  
and returned to a clean analog ground.  
ΔGainError  
ΔSupply  
PSRR = 20×log  
Note that when heavy load measuring, Δsupply will cause  
Δtemperature. And Δtemperature will cause Δoutput  
voltage. So the heavy load PSRR measuring is include  
temperature effect.  
Current limit  
The RT9013 contains an independent current limiter, which  
monitors and controls the pass transistor's gate voltage,  
limiting the output current to 0.6A (typ.). The output can  
be shorted to ground indefinitely without damaging the part.  
Thermal Considerations  
Thermal protection limits power dissipation in RT9013.  
When the operation junction temperature exceeds 170°C,  
the OTP circuit starts the thermal shutdown function and  
turns the pass element off. The pass element turn on again  
after the junction temperature cools by 30°C.  
Region of Stable COUT ESR vs. Load Current  
100  
Unstable Range  
10  
For continuous operation, do not exceed absolute  
maximum operation junction temperature 125°C. The  
power dissipation definition in device is :  
1
Stable Range  
0.1  
PD = (VIN VOUT) x IOUT + VIN x IQ  
0.01  
The maximum power dissipation depends on the thermal  
resistance of IC package, PCB layout, the rate of  
surroundings airflow and temperature difference between  
junction to ambient. The maximum power dissipation can  
be calculated by following formula :  
Unstable Range  
RT9013-33PB, VIN = 5V  
IN = COUT = 1μF/X7R  
C
0.001  
0
100  
200  
300  
400  
500  
Load Current (mA)  
Figure 1  
PD(MAX) = ( TJ(MAX) TA ) /θJA  
www.richtek.com  
8
DS9013-05 August 2007