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鈥揻ree transitions from 鈥渟leep鈥?to 鈥渁ctive鈥?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鈥搕o鈥?.3V voltage regulator or an external P鈥揷hannel
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鈥揷hannel 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:
MC33565
200 mA INTELLIGENT LDO
REGULATOR WITH SMART
BYPASS CONTROL
SEMICONDUCTOR
TECHNICAL DATA
8
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
1
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鈥揻ree transfer from sleep mode to active mode
Compatible with
Instantly Available
PC systems
Evaluation Kit Available: (P.N. MC33565EVK)
Simplified Block Diagram
+3.3 Vin
D SUFFIX
PLASTIC PACKAGE
CASE 751鈥?6
(SO鈥?)
1
8
+5 Vin
N/C
+3.3 Vin
Gnd
Drive out
2
3
4
7
MC33565
6
5
+3.3 Vout
Sense in
N/C
Compensation
&
Hysteresis
Hyst sw
Comp
Driver
Drive out
External
P鈥揷hannel
MOSFET
Pins 2 and 5 Not Connected
ORDERING INFORMATION
Device
+3.3 Vout
MC33565D
Type
3.3V
Package
SO鈥?
Ref &
Detect
5V detect
Vref
+3.3 Vout
+5 Vin
Sense in
LDO
External
4.7
碌F
cap
漏
Motorola, Inc. 1999
Rev 0, 6/99
MOTOROLA ANALOG IC DEVICE DATA
1
MC33565D 产品属性
98
集成电路 (IC)
PMIC - 稳压器 - 线性
-
正，固定式
3.3V
4.3 V ~ 5.5 V
-
1
200mA
-
-5°C ~ 150°C
表面贴装
8-SOIC（0.154"，3.90mm 宽）
8-SOICN
管件
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