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TJ2132GQ 参数 Datasheet PDF下载

TJ2132GQ图片预览
型号: TJ2132GQ
PDF下载: 下载PDF文件 查看货源
内容描述: [2.0A Low Output Voltage Ultra LDO Regulator]
分类和应用:
文件页数/大小: 13 页 / 1904 K
品牌: HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
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2.0A Low Output Voltage Ultra LDO Regulator  
TJ2132  
any bulk capacitor on the rail. Additionally, input droop due to load transients is reduced, improving load  
transient response. Additional capacitance may be added if required by the application.  
Soft Start Time  
The TJ2132 has an internal current source that charges an external slow start capacitor to implement a  
slow start time. Equation 2 and Table 1 shows how to select a slow start capacitor based on an expected  
slow start time. The R is 302kΩ, VO is 0.6V and i(t) is 40nA.  
( )  
 ꢁꢁ(ꢂ) =ꢄꢅꢁꢁ × ꢆꢇ     
(2)  
Table 1. Capacitor Values for the soft-start time  
CSS  
Calculated Soft-Start Time  
Measured Soft-Start Time  
470pF  
1nF  
0.56ms  
1.18ms  
3.18ms  
6.6ms  
0.64ms  
1.23ms  
3.44ms  
7.1ms  
2.7nF  
5.6nF  
10nF  
11.8ms  
12.0ms  
Decoupling (Bypass) Capacitor  
In very electrically noisy environments, it is recommended that additional ceramic capacitors be placed  
from VIN to GND. The use of multiple lower value ceramic capacitors in parallel with output capacitor also  
allows to achieve better transient performance and stability if required by the application. (See Fig.1)  
Feed-Forward Capacitor  
To get the higher PSRR than the inherent performance of TJ2132, it is recommended that additional  
ceramic feed-forward capacitor be placed from OUT pin to FB pin. The capacitance of feed-forward  
capacitor with range of 10pF to 1uF allows to achieve better PSRR performance when required by the  
application. (See Fig.1)  
Fig.1 Application with Decoupling & Feed-Forward Capacitor  
Maximum Output Current Capability  
The TJ2132 can deliver a continuous current of 2A over the full operating junction temperature range.  
However, the output current is limited by the restriction of power dissipation which differs from packages.  
A heat sink may be required depending on the maximum power dissipation and maximum ambient  
Aug. 2014 Rev.1.1.3  
11  
HTC