CMPWR160 Datasheet, PDF (1/10 Pages) California Micro Devices Corp – USB peripheral Power Management

CALIFORNIA MICRO DEVICES
CMPWR160
USB Peripheral Power Management
Features
• 3.3V regulated output up to 500mA
• Quiescent current 35µA (typical)
• Shutdown mode current 7µA (typical)
• 30ms active LOW Power-On Reset (POR) pulse
• Thermal overload protection
• Foldback current limiting protection
• Reverse-current protection
• 8 pin SOIC power package
Applications
• Bus-powered USB peripherals
• Self-powered USB peripherals
• Portable/battery-powered devices
• Critical power monitoring, hot-insertion devices
The SmartOR^TM CMPWR160 combines a Low Dropout
Regulator (LDO) with a Power-On Reset (POR) pulse
generator, and is intended for Universal Serial Bus
(USB) peripherals. To meet the specification require-
ments of both USB 1.0 and USB 2.0, the CMPWR160
draws a very low quiescent current (35µA), and delivers
up to 500mA of load current at a fixed 3.3V output.
The POR pulse (active LOW) has a typical duration of
30ms after the output has exceeded and stabilized
above 2.9V. Thus a new POR pulse is developed each
time the regulator power is interrupted and restored,
which occurs often on USB buses when cables are
connected (or disconnected) by the user. It is not
necessary to have a V_CC supply for POR to operate,
allowing the CMPWR160 to work in Wired-ORed power
systems.
When V is powered down, the device will automatically
CC
enter reverse-current protection mode and maintain
isolation between V and V . This is useful for applica-
OUT
CC
tions that can use power from the USB port in addition to
internal batteries or an AC adapter supply (Wired-ORed
power systems). In the event of V_CC collapsing below
V_OUT, the device will automatically enter shutdown mode
and fully isolate the V_CC power source from the output.
A ShutDown input (SD) forces the regulator to be
powered down on demand. While in shutdown mode the
POR circuitry will remain active, making the device
suitable for systems which contain backup or alternative
power sources.
The CMPWR160 is available in an 8-pin SOIC thermally
enhanced package, ideal for applications where space
is tight.
V_CC
SD
POR
V_OUT
Top View
1
8
2
7
3
6
4
5
CMPWR160
8 LEAD SOIC
Pin Diagram
GND
GND
GND
GND
Block Diagram
V_CC
SD
+ ^SD
GND
V_REF
–
3.3V
+
30ms
–
V_OUT
3.3V/500mA
POR
2.9V
Simplified Electrical Schematic
Package
Pin
8
Standard Part Ordering Information
Ordering Part Number
Style
Tubes
Tape & Reel
Power SOIC
CMPWR160SA/T
CMPWR160SA/R
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035  Tel: [phone]
12/5/2000
Fax: [phone]
Part Marking
CMPWR160SA
C1571000
www.calmicro.com
1