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GQ2131 Datasheet(PDF) 2 Page - E-Tech Electronics LTD |
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GQ2131 Datasheet(HTML) 2 Page - E-Tech Electronics LTD |
2 / 5 page 2/5 ISSUED DATE :2005/07/05 REVISED DATE : Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input 2 Gnd Ground 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high= enable; Logic low= shutdown. Do not leave open. 4 PG Power Good Output 5 VOUT Regulator Output Ordering Information ( contd. ) Part Number Marking Output Voltage Part Number Marking Output Voltage GQ2131-12 1C122 XXXX 1.2V Detailed Description The GQ2131 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, over -current protection, thermal shutdown and Power Good function. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150 : , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GQ2131 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2131 also incorporates current fold-back to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. External Capacitors The GQ2131 is stable with an output capacitance to ground of 2.2 F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1 F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This can be achieved with a “Star” connection. Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1 A. This pin behaves much like an electronic switch. Fig 1. Typical Application Schematic Fig 2. Typical Application For Processor VID Code Power Sequencing Schematic |
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