ace1085 ACE Technology Co., LTD., ace1085 Datasheet - Page 5

• Manufacturer Part Number: ace1085
• Description: 3a Low Dropout Linear Regulator
• Manufacturer: ACE Technology Co., LTD.

Application Hints
1. Recommend using 10uF tan capacitor as bypass capacitor for all application circuit.
2. Recommend using 22uF tan capacitor to assure circuit stability.
3. Using a bypass capacitor(CAdj) between the adjust terminal and ground can improve ripple rejection,
This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The
impedance of CAdj should be less than the resistor’s(R1) which is between output and adjust pins to
prevent ripple from being amplified at any ripple frequency. As R1 is normally in the range of
120Ω~200Ω,the value of CAdj should satisfy this equation: 2*Fripple*CAdj<R1. Recommend using 10uF
tan capacitor.
Output Voltage of Adjustable Version
1.25V~13.8V can be available by choosing two external resistors (connection method is shown in chart 1).
In chart 1, R1,R2 is the two external resistors.
Explanation
Vout=VRef*(1+R2/R1)+IAdj*R2. We can ignore IAdj because IAdj(about 50uA) is much less than the
current of R1(about 4mA).
normally without any load. To assure the electrical performance showed in table 1, the output current
should be larger than 5mA. If R1 is too large, the minimum output current should be larger than 4mA , The
best working condition is to assure that the output current exceeds 10mA.
The ACE1085 adjustable version provide 1.25V Reference Voltage. Any output voltage between
The output voltage of adjustable version satisfies this followed equation:
How to choose R1：The value of R1 should be in the range of 120Ω～200Ω to assure chip working
Typical application of ACE1085
Technology
ACE1085
3A Low Dropout Linear Regulator
ACE1085
VER 1.2
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