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G5910-50TBU Datasheet(PDF) 7 Page - Global Mixed-mode Technology Inc |
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G5910-50TBU Datasheet(HTML) 7 Page - Global Mixed-mode Technology Inc |
7 / 10 page Ver: 1.4 May 19, 2006 TEL: 886-3-5788833 http://www.gmt.com.tw 7 G5910 Global Mixed-mode Technology Inc. Pin Descriptions PIN NAME FUNCTION 1 VOUT Regulated output pin. Bypass this pin to ground with at least 6.8µF low ESR capacitor 2 GND Ground connection 3 SHDN Shutdown input. Active low signal disables the converter. 4 C- Flying capacitor negative terminal 5 VIN Input supply pin. Bypass this pin to ground with at least 6.8µF low ESR capacitor 6 C+ Flying capacitor positive terminal Detailed Description The G5910 uses a switched capacitor charge pump to boost an input voltage to a regulated output volt- age. Through an internal resistor divider network the output regulation is achieved by sensing the charge pump output voltage. When the divided output drops below a preset trip point that con- trolled by an internal comparator a switched dou- bling circuit is enabled. The charge pump switch cycling enables four internal switches at two non-overlapping phases. During the first phase, switches S1 and S4 are switched on (short) and switch S2 and S3 are off (open). The flying capaci- tor CFLY is charged to a level approximately equal to input voltage VIN. On the second phase, switches S1 and S4 are turned off (open), S2 and S3 are turned on (short). During the first phase the low side of the flying capacitor CFLY is connected to GND. During the second phase, the flying capacitor CFLY is switched so that the low side is connected to VIN. The voltage at the high side of the flying ca- pacitor CFLY is bootstrapped to 2 × VIN and is con- nected to output through a switch. For each cycle phase, charge from input node VIN is transported from a lower voltage to a higher voltage. This cycle repeats itself until the output node voltage is high enough to exceed the preset input threshold of the control comparator. When the output voltage ex- ceeds the internal trip point voltage level, the switching cycle stops and the charge pump circuit is placed in an idle state. The closed loop feed back system containing the voltage sense circuit and control comparator allows the G5910 to provide a regulated output voltage and output load current. An integrated oscillator within the control circuit block creates the switching signal that drives the charge pump. The free running charge pump switching frequency is approximately 1MHz. The G5910 has complete output short circuit and ther- mal protection to safeguard the device under ex- treme operating conditions. When output voltage is short to ground, the switches S1, S4, and S3 are turned on with limited current of 220mA. After the short circuit condition has been released and output voltage rises above a threshold voltage, the G5910 will go into normal operation mode. An internal thermal protection circuit senses die temperature and will shut down the device if the internal junction temperature exceeds approximately 150°C. The charge pump will remain disabling until the fault condition is relieved. |
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