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Motorola Electronic Components Datasheet

MC33565 Datasheet

200 mA INTELLIGENT LDO REGULATOR WITH SMART BYPASS CONTROL

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Order this document by MC33565/D
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)
+3.3 Vin
Simplified Block Diagram
MC33565
200 mA INTELLIGENT LDO
REGULATOR WITH SMART
BYPASS CONTROL
SEMICONDUCTOR
TECHNICAL DATA
8
1
+5 Vin
N/C
+3.3 Vin
Gnd
1
2
3
4
8
Drive out
7
+3.3 Vout
MC33565 6
Sense in
5
N/C
D SUFFIX
PLASTIC PACKAGE
CASE 751–06
(SO–8)
Compensation
&
Hysteresis
Hyst sw
Comp
Driver Drive out
Ref &
Detect Vref
5V detect
External
P–channel
MOSFET
+3.3 Vout
Pins 2 and 5 Not Connected
ORDERING INFORMATION
Device
MC33565D
Type
3.3V
Package
SO–8
+5 Vin
LDO
+3.3 Vout
Sense in
MOTOROLA ANALOG IC DEVICE DATA
External
4.7 µF
cap
© Motorola, Inc. 1999
Rev 0, 6/99
1


Motorola Electronic Components Datasheet

MC33565 Datasheet

200 mA INTELLIGENT LDO REGULATOR WITH SMART BYPASS CONTROL

No Preview Available !

MC33565
MAXIMUM RATINGS (TC = 25°C, unless otherwise noted)
Parameter
Symbol
Input Voltage, VCC
Vmax
Vmin
Operating Ambient Temperature
Operating Junction Temperature
Lead Temperature (Soldering, 10 seconds)
Ta
TJ
TL
Storage Temperature Range
Package Thermal Resistance, Junction to Ambient
Tstg
RθJA1
NOTES: 1. Mounted on recommended minimum PCB pad on FR4, 2–oz. copper circuit board.
Max Value
7.0
–0.5
–5 to +70
– 5 to +150
300
– 55 to +150
180
Unit
Vdc
Vdc
°C
°C
°C
°C
°C/W
AC ELECTRICAL SPECIFICATIONS(3) (4)
Parameter
Symbol
Min
Typ
Max
Drive High Delay (Vin ramping up)
tDH 0.5 3.5
CDrive = 1.2 nF, measured from +5 Vin = VthresHi to VDrive = 2V
Drive Low Delay (Vin ramping down)
CDrive = 1.2 nF, measured from +5 Vin = VthresLo to VDrive = 2V
tDL
0.5 3.5
NOTES: (1.) See 5V Detect Thresholds Diagram.
W(2.) Recommended source impedance for 5V supply: 0.25 . This will ensure that Io x Rsource < Vhyst, thus avoiding
driveout toggling during 5V detect threshold transitions.
(3.) See Figure 2. Application Block Diagram.
(4.) See Timing Diagram.
Unit
µS
µS
PIN ASSIGNMENTS AND FUNCTIONS
PIN #
PIN NAME
PIN DESCRIPTION
1
+5 Vin
This is the input supply for the IC. Typical voltage 5 V. (1) (2)
2,5 N/C Reserved
3
+3.3 Vin
Auxiliary input. Typical voltage 3.3 V.
4 Gnd Logic and Power Gnd.
6
Sense in
Load–sense voltage input to internal regulator.
7
+3.3 Vout
3.3V output provided to the application circuit (output current is sourced to this pin from the 5V input.)
This output drives a P–channel MOSFET with up to 2000pF of “effective” gate capacitance.
8
Drive out
Recommended device is MGSF1P02ELT MOSFET. Drive out has active internal pull–up and
pull–down circuitry to guarantee fast transitions.
DEVICE MARKING
Device
MC33565D
Type
3.3 V
Sub–type
Marking (1st Line)
MC565
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33565
Description 200 mA INTELLIGENT LDO REGULATOR WITH SMART BYPASS CONTROL
Maker Motorola
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MC33565 Datasheet PDF






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