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MC33566D2T-1RK View Datasheet(PDF) - ON Semiconductor

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MC33566D2T-1RK Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
MC33566
Smart Voltage Regulator for
Peripheral Card Applications
The MC33566 Low Dropout Regulator is designed for computer
peripheral card applications complying with the instantly available
requirements as specified by ACPI objectives. The MC33566 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 5.0 V power supply or the 3.3 V aux supply.
The MC33566 provides a regulated output voltage of 3.3 V via
either an internal low dropout 5.0 V–to–3.3 V 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
(5.0 V main supply available) the 3.3 V output is provided from the
internal low dropout regulator at an output current of 0.4 A. When the
motherboard enters sleep mode, the MC33566 operates from the 3.3 V
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 3.3 V even during host systems transitions to and from
sleep mode.
MC33566 Features:
Output Current up to 0.4 A
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
+3.3 Vaux
Compensation
&
Hysteresis
Hyst sw
Comp
Driver Drive out
External
P-channel
MOSFET
http://onsemi.com
MARKING
DIAGRAM
1
5
D2PAK
D2T SUFFIX
CASE 936A
M5
661
AWLYWW
Pin 1. Vaux
1
5
2. Vin
3. Gnd
4. Vout
5. Drv
Note: Tab is ground
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
ORDERING INFORMATION
Device
Package
Shipping
MC33566D2T–1
D2PAK
50 Units/Rail
MC33566D2T–1RK D2PAK 2500 Tape & Reel
Ref &
Detect Vref
5V detect
+3.3 Vout
+5 Vin
+3.3 Vout
LDO
Figure 1. Simplified Block Diagram
External
4.7 µF
cap
© Semiconductor Components Industries, LLC, 2001
1
March, 2001 – Rev. 1
Publication Order Number:
MC33566/D
 

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