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PAM3103ADJABADJ Datasheet(PDF) 6 Page - Power Analog Micoelectronics |
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PAM3103ADJABADJ Datasheet(HTML) 6 Page - Power Analog Micoelectronics |
6 / 10 page 6 Capacitor Selection and Regulator Stability ADJ Output Voltage Programming Load Transient Considerations Shutdown Input Operation Internal P-Channel Pass Transistor Input-Output (Dropout) Voltage Current Limit and Short Circuit Protection Similar to any low dropout regulator, the external capacitors used with the PAM3103 must be carefully selected for regulator stability and performance. Please note that the distance between C and the input pin of the PAM3103 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3103. Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response. The PAM3103 is designed specifically to work with low ESR ceramic output capacitors in order to save space and improve performance. Using an output ceramic capacitor whose value is > The output voltage of the PAM3103 adjustable regulator is programed by using an external resistor divider as shown in Figure1. The output voltage is calculated as below: V =V (1+R1/R2) Resistor R 1 and R2 should be chosen for approximately 7 A divider current. Lower value resistors can be used but offer no advantage and waste more power. Higher value should be avoided as leakage current at ADJ pin increase the output voltage error. V/V - 1 C u r v e7o f on page 5 shows two components of the output response: a DC shift from the output impedance due to the load current change and transient response. The DC shift is quite small due to excellent load regulation of the PAM3103. The transient spike, resulting from a step change in the load current from 1mA to 300mA, is 20mV. The ESR of the output capacitor is critical t o t he transient spike. A larger capacitance along with smaller ESR results in a smaller spike. The PAM3103 can be shut down by pulling the EN input low, and turned on by tying the EN input to VIN or leaving the EN input floating. The PAM3103 features a 0.75 device as a pass transistor. The P- MOS pass transistor enables the PAM3103 to consume only 65 A of ground current during low dropout, light-load, or heavy-load operation. This feature increases the battery operation life time. A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. The PAM3103 has a typical 300mV dropout voltage. In battery- powered systems, this will determine the useful end-of-life battery voltage. The PAM3103 features a current limit, which monitors and controls the gate voltage of the pass transistor. The output current can be limited to 400mA by regulating the gate voltage. The PAM3103 also has a built-in short circuit current limit. IN OREF OREF 2.2μF with ESR>5mΩ ensures stability. μ Ω P-Channel MOSFET μ A capacitor C of more than 1μF can be employed in the input pin, while there is no upper limit for the capacitance of C . the PAM3103 load-transient response IN IN C is unnecessary when R1 or R2 <20k . The recommended design procedure is to choose R2=169k to set the divider current at 7 A and then calculate R1 as below: R1=( )R2 C Ω Ωμ Application Information 09/2008 Rev 1.2 , Power Analog Microelectronics Inc www.poweranalog.com PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator |
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