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RT9013-31GB Datasheet(PDF) 7 Page - Richtek Technology Corporation |
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RT9013-31GB Datasheet(HTML) 7 Page - Richtek Technology Corporation |
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7 / 10 page  RT9013B 7 DS9013B-02 April 2011 www.richtek.com Applications Information Like any low-dropout regulator, the external capacitors used with the RT9013B must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1uF / X7R on the RT9013B input and the amount of capacitance can be increased without limit. The input capacitor must be located at 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. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RT9013B 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 1uF with ESR is > 20m Ω on the RT9013B output ensures stability. The RT9013B 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 RT9013B and returned to a clean analog ground. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = ΔSupply Error ΔGain log 20 PSRR Figure 1 Enable The RT9013B goes into sleep mode when the EN pin is in a logic low condition. During this condition, the RT9013B has an EN pin to turn on or turn off the regulator, When the EN pin is logic hight the regulator will be turned on. The supply current to 0.7uA 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. 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 Note that in heavy load measuring, Δsupply will cause Δtemperature. And Δtemperature will cause Δoutput voltage. So the temperature effect is include in heavy load PSRR measuring. Current Limit The RT9013B contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 0.4A (typ.). The output can be shorted to ground indefinitely without damaging the part. Thermal Considerations Thermal protection limits power dissipation in the RT9013B. 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 will be turned on again after the junction temperature cools by 30 °C. For continuous operation, do not exceed absolute maximum operation junction temperature 125 °C. The power dissipation definition in the device is calculated as follows : PD = (VIN − VOUT) x IOUT + VIN x IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between Region of Stable COUT ESR vs. Load Current 0.001 0.01 0.1 1 10 100 0 50 100 150 200 250 300 Load Current (mA) VIN = 5V CIN = COUT = 1uF/X7R Stable Range Unstable Range Unstable Range |
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