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G924-285T1UF Datasheet(PDF) 6 Page - Global Mixed-mode Technology Inc |
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G924-285T1UF Datasheet(HTML) 6 Page - Global Mixed-mode Technology Inc |
6 / 9 page Ver: 0.2 Preliminary Oct 01, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 6 G924 Global Mixed-mode Technology Inc. Pin Description PIN NAME FUNCTION 1 SHDN Active-High Enable Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal operation. 2 GND Ground. This pin also functions as a heat sink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. 3 BYP This is a reference bypass pin. It should connect external 10nF capacitor to GND to reduce output noise. Bypass capacitor must be no less than 1nF. (CBYP≥ 1nF) 4 OUT Regulator Output. Sources up to 300mA. Bypass with a 1µF capacitor to GND. 5 VIN Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND. Detailed Description The block diagram of the G924 is shown in Figure 1. It consists of an error amplifier, 1.20V 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 1.20V bandgap reference. If the feedback voltage is higher than 1.20V, 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 voltage is equal to 1.20V. Similarly, when the feedback voltage is less than 1.20V, the error amplifier causes the output PMOS to conduct more current to pull the feedback voltage up to 1.20V. Thus, through this feedback action, the error amplifier, output PMOS, and the voltage dividers effec- tively form a unity-gain amplifier with the feedback voltage force to be the same as the 1.20V bandgap reference. The output voltage, VOUT, is then given by the following equation: VOUT = 1.20 (1 + R1/R2). (1) Alternatively, the relationship between R1 and R2 is given by: R1 = R2 (VOUT / 1.20 - 1). (2) For the output voltage versions of G924, the output voltages are 1.20V for G924-120, 2.50V for G924-250, 3.30V for G924-330, etc. Figure 1. Functional Diagram SHDN VIN OUT SHUTDOWN LOGIC 1.2V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT BYP C BYP SHDN VIN OUT SHUTDOWN LOGIC 1.2V Vref - ERROR AMP + OVER CURRENT PROTECT & DYNAMIC FEEDBACK GND R1 R2 OVER TEMP. PROTECT BYP C BYP |
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