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G920CT11U Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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G920CT11U Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 7 page Ver 0.0 Preliminary Mar 27, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 5 G920 Global Mixed-mode Technology Inc. Pin Description PIN NAME FUNCTION 1 NC This is a NC pin, should be left unconnected. 2 IN Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF to GND. 3 OUT Regulator Output. Sources up to 150mA. Bypass with a 1µF, <0.2 Ω typical ESR capacitor to GND. 4 EN Active-High Enable Input. A logic low reduces the supply current to less than 1 µA. Connect to IN for normal operation. 5,6,7,8 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. Detailed Description The block diagram of the G920 is shown in Figure 1. It consists of an error amplifier, 1.25V bandgap refer- ence, PMOS output transistor, internal feedback voltage divider, shutdown logic, over current protection circuit, and over temperature protection circuit. The internal feedback voltage divider’s central tap is connected to the non-inverting input of the error ampli- fier. The error amplifier compares non-inverting input with the 1.25V bandgap reference. If the feedback voltage is higher than 1.25V, the error amplifier’s out- put becomes higher so that the PMOS output transis- tor has a smaller gate-to-source voltage (VGS). This reduces the current carrying capability of the PMOS output transistor, as a result the output voltage de- creases until the feedback v41oltage is equal to 1.25V. Similarly, when the feedback voltage is less than 1.25V, the error amplifier causes the output PMOS to conductor more current to pull the feedback voltage up to 1.25V. Thus, through this feedback action, the error amplifier, output PMOS, and the voltage divider effec- tively form a unity-gain amplifier with the feedback voltage force to be the same as the 1.25V bandgap reference. The output voltage, VOUT, is then given by the following equation: VOUT = 1.25 (1 + R1/R2). (1) For the G920, the pre-set output voltage is 3.3V. Figure 1. Functional Diagram EN IN OUT SHUTDOWN LOGIC 1.25V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT EN IN OUT SHUTDOWN LOGIC 1.25V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT |
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