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MC33565 Datasheet(PDF) 1 Page - ON Semiconductor |
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MC33565 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 8 page MC33565 SEMICONDUCTOR TECHNICAL DATA 200 mA INTELLIGENT LDO REGULATOR WITH SMART BYPASS CONTROL Order this document by MC33565/D D SUFFIX PLASTIC PACKAGE CASE 751–06 (SO–8) Pins 2 and 5 Not Connected 8 1 +5 Vin N/C +3.3 Vin Gnd Drive out +3.3 Vout Sense in N/C 1 2 3 4 8 7 6 5 MC33565 Device Type Package ORDERING INFORMATION MC33565D 3.3V SO–8 1 MOTOROLA ANALOG IC DEVICE DATA Smart Voltage Regulator for Peripheral Card Applications The MC33565 Low Dropout Regulator is designed for computer peripheral card applications complying with the instantly available requirements as specified by ACPI objectives. The MC33565 permits glitch–free transitions from “sleep” to “active” system modes and has internal logic circuitry to detect whether the system is being powered from the motherboard main 5V power supply or the 3.3V aux supply. The MC33565 provides a regulated output voltage of 3.3V via either an internal low drop out 5.0V–to–3.3V voltage regulator or an external P–channel MOSFET, depending on the operating status of the system in which the card is installed. During normal operating mode (5V main supply available) the 3.3V output is provided from the internal low dropout regulator at an output current of 200mA. When the motherboard enters sleep mode, the MC33565 operates from the 3.3V aux supply and routes the aux current to the output via the external P–channel MOSFET bypass transistor controlled by the drive out pin. As a result, the output voltage provided to the peripheral card remains constant at 3.3V even during transitions to and from sleep mode. MC33565 Features: • Output Regulated to 2% Over Temperature • Output current up to 200mA • Excellent Line and Load Regulation • Low Dropout Voltage • Prevents reverse current flow during sleep mode • Glitch–free transfer from sleep mode to active mode • Compatible with Instantly Available PC systems • Evaluation Kit Available: (P.N. MC33565EVK) Simplified Block Diagram Vref Compensation & Hysteresis +5 Vin Ref & Detect 5V detect Comp Driver Drive out +3.3 Vout Sense in +3.3 Vin Hyst sw External P–channel MOSFET +3.3 Vout External 4.7 µF cap LDO © Motorola, Inc. 1999 Rev 0, 6/99 |
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