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TJ4230GR-3.3V-5L Datasheet(PDF) 7 Page - HTC Korea TAEJIN Technology Co. |
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TJ4230GR-3.3V-5L Datasheet(HTML) 7 Page - HTC Korea TAEJIN Technology Co. |
7 / 9 page 3A Ultra Low Dropout Linear Regulator TJ4230 Apr. 2011 – Rev. 1. 0 7/9 HTC Output Adjustment (Adjustable Version) An adjustable output device has output voltage range of 0.8V to 5.0V. The operating condition of VIN and the operating characteristics of VOUT depend on the dropout voltage performance in accordance with output load current presented at Fig. 7. To obtain a desired output voltage, the following equation can be used with R1 resistor range of 100Ω to 50kΩ. COUT 10uF CIN 10uF EN VIN VOUT ADJ TJ4230 GND VIN VOUT EN R2 R1 CFF ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 1 8 0 1 2 . V R R OUT Fig. 4. Application for Adjustable Output Voltage To enhance output stability, a feed-forward capacitor of 10nF to 1uF can be placed in series with VOUT and ADJ.(Refer to "Component Selection" Section) SENSE Pin In applications where the regulator output is not very close to the load, the TJ4230 can provide better remote load regulation characteristics using the SENSE pin. TJ4230 regulates the voltage at the output pin. Hence, the voltage at the remote load will be lower than the voltage at the output pin as a value of the voltage drop across the trace series resistance. If the sense option pin is not required, the sense pin must be connected to the VOUT pin. Connecting the sense pin to the remote load will provide regulation at the remote load because the TJ4230 regulates the voltage at the sense pin when the sense option pin is used. Fig. 5. Conventional Linear Regulator Application Fig.6. Remote Load Sense Application Maximum Output Current Capability The TJ4230 can deliver a continuous current of 3A 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 temperature of application. With respect to the applied package, the maximum output current of 3A may be still undeliverable due to the restriction of the power dissipation of TJ4230. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The temperatures over the device are given by: TC = TA + PD X θCA TJ = TC + PD X θJC TJ = TA + PD X θJA |
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