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TJ4230GRS-2.5V-5L Datasheet(PDF) 6 Page - HTC Korea TAEJIN Technology Co. |
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TJ4230GRS-2.5V-5L Datasheet(HTML) 6 Page - HTC Korea TAEJIN Technology Co. |
6 / 9 page 3A Ultra Low Dropout Linear Regulator TJ4230 Apr. 2011 – Rev. 1. 0 6/9 HTC APPLICATION INFORMATION Introduction TJ4230 is intended for applications where high current capability and very low dropout voltage are required. It provides a simple, low cost solution that occupies very little PCB estate. Additional features include an enable pin to allow for a very low power consumption standby mode, an adjustable pin to provide a fully adjustable output voltage, and SENSE pin to provide better remote load regulation characteristics. Component Selection Input Capacitor : A large bulk capacitance over than 10uF should be closely placed to the input supply pin of the TJ4230 to ensure that the input supply voltage does not sag. Also a minimum of 10uF ceramic capacitor is recommended to be placed directly next to the VIN Pin. It allows for the device being some distance from 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.(See Fig.1) Output Capacitor : A minimum ceramic capacitor over than 10uF should be very closely placed to the output voltage pin of the TJ4230. Increasing capacitance will improve the overall transient response and stability. 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 TJ4230, it is recommended that additional ceramic feed-forward capacitor be placed from VOUT pin to ADJ 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.2) Fig. 1. Application with Decoupling Capacitor, Fig. 2. Application with Feed-Forward Capacitor, CC1 & CC2 CFF Delayed Start-Up When power sequence control is required or rising time of input supply voltage is over than 100usec, it is recommended to apply delayed start-up by using Cdelay as shown in Fig. 3. It can adjust proper delay by Rp-Cdelay time constant. And also it can prevent any unexpected transient characteristics at output voltage when the rising time of input supply voltage is as long as 100usec or longer. Fig. 3. Application with Delayed Start-Up COUT 10uF EN VIN VOUT SENSE TJ4230 GND VIN VOUT RP CC2 CIN 10uF CC1 COUT 10uF CIN 10uF EN VIN VOUT ADJ TJ4230 GND VIN VOUT R2 R1 RP CC2 CFF CC1 COUT 10uF CIN 10uF EN VIN VOUT ADJ TJ4230 GND VIN VOUT R2 R1 RP CFF Cdelay |
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