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G9131-18T26U Datasheet(PDF) 8 Page - Global Mixed-mode Technology Inc |
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G9131-18T26U Datasheet(HTML) 8 Page - Global Mixed-mode Technology Inc |
8 / 10 page Ver: 1.6 Dec 22, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 8 G9131 Global Mixed-mode Technology Inc. Applications Information Capacitor Selection and Regulator Stability Normally, use a 1µF capacitor on the input and a 1µF capacitor on the output of the G9131. Larger input ca- pacitor values and lower ESR provide better sup- ply-noise rejection and transient response. For stable operation over the full temperature range, with load currents up to 120mA, a minimum of 1µF is recom- mended. Power-Supply Rejection and Operation from Sources Other than Batteries The G9131 is designed to deliver low dropout voltages and low quiescent currents in battery powered sys- tems. Power-supply rejection is 47dB at low frequen- cies the output capacitor is the major contributor to the rejection of power-supply noise. When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output ca- pacitors, and using passive filtering techniques. Load Transient Considerations The G9131 load-transient response graphs show two components of the output response: a DC shift of the output voltage due to the different load currents, and the transient response. Typical overshoot for step changes in the load current from 0mA to 300mA is 10mV. Increasing the output capacitor's value and decreasing its ESR attenuates transient spikes. Input-Output (Dropout) Voltage A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Be- cause the G9131 use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current. Figure 1. Functional Diagram IN OUT 1.25V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT P IN OUT 1.25V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT P |
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