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GQ2171-20 Datasheet(PDF) 3 Page - E-Tech Electronics LTD |
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GQ2171-20 Datasheet(HTML) 3 Page - E-Tech Electronics LTD |
3 / 5 page 3/5 ISSUED DATE :2005/12/12 REVISED DATE : Ordering Information ( contd. ) Part Number Marking Output Voltage Part Number Marking Output Voltage GQ2171-15 1K152 XXXX 1.5V GQ2171-18 1K182 XXXX 1.8V GQ2171-20 1K202 XXXX 2.0V GQ2171-25 1K252 XXXX 2.5V GQ2171-27 1K272 XXXX 2.7V GQ2171-28 1K282 XXXX 2.8V GQ2171-2H 1K2H2 XXXX 2.85V GQ2171-30 1K302 XXXX 3.0V GQ2171-32 1K322 XXXX 3.2V GQ2171-33 1K332 XXXX 3.3V Detailed Description The GQ2171 series of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. 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 150mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GQ2171 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2171 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 GQ2171 is stable with an output capacitance to ground of 0.22 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. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 1 F to have a beneficial effect. A large capacitor improves the AC ripple rejection, but also makes the output come up slowly. This “Soft” turn-on is desirable in some applications to limit turn-on surges. 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. Shutdown 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. Characteristics Curve |
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