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參數(shù)資料
| 型號： | CMPWR160SA/R |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | POWER, SOIC-8 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 112K |
| 代理商： | CMPWR160SA/R |
2001 California Micro Devices Corp. All rights reserved. SmartOR
is a trademark of California Micro Devices Corporation.
9/17/2001
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
8
CMPWR160
CALIFORNIA MICRO DEVICES
Applications
USB Bus-powered Peripheral Application
Universal Serial Bus (USB) peripherals can be powered
from the USB port. The cable carries signal on 2 lines,
a V
line which is nominally 5V at the source and a
GND wire. See Figure 15. For example, an external
modem (USB device or peripheral) draws its power
from the USB port of a personal computer (USB host),
and one definite advantage of bus-powered devices is
that they do not need extra power cords and plugs.
The USB specification (revisions 1.1 and 2.0) sets
various limitations on the power distribution. A bus-
powered device must draw no more than 500mA in
operating mode. A
“
Suspend
”
mode is entered when no
data is exchanged on the bus between the host and
the peripheral device. In this mode the current drawn
by the peripheral is reduced and may not exceed
500μA. The CMPWR160 addresses these requirements
by providing regulations up to 500mA, with overload
current limit, short-circuit current limit, and a very low
quiescent current.
Each peripheral is required to have one data line, D+ or
D
–
, connected to a 1.5K
pull-up resistor terminated to
a 3.3V reference. The resistor is either connected to
the D+ data line for selecting high-speed mode, or to
the D
–
data line for low-speed mode. The pull-up
resistor draws 200μA current on all USB devices. In
Suspend mode, there is only 300μA (500μA - 200μA)
left to power the controller and the regulator. Clearly,
the low quiescent current (35
μ
A typical) of the
CMPWR160 is a definite advantage. The CMPWR160
3.3V output can be used as a reference voltage for the
pull-up resistor.
Figure 15. High-speed Device Cable
and Pull-up Resistor Connection
USB peripherals are classified in two groups: low-power
and high-power bus-powered devices. Low-power
functions draw less that 100mA when operational and
must be capable of operating with input V
voltage as
low as 4.40V. High-power functions can draw up to
500mA when operational and must be capable of
operating with an input V
voltage as low as 4.75V.
The CMPWR160 operates with input voltage down to
4.2V under full rated load (500mA for the
CMPWR160SA, 300mA for the CMPWR160MA). It is
suited for any type of function even under transient
conditions with 330mV drop on V
BUS
.
Power-Outage-Reset Operation
The CMPWR160 asserts a reset signal (
POR
) when-
ever the output voltage V
drops below the V
threshold of 2.9V typical, keeping it asserted for 30ms
after V
has risen above the reset threshold. The
reset signal is active-low, and its high level voltage is
set by V
OUT
.
The device provides immunity to short-duration
negative-going pulse applied to V
. The data sheet
figure 11 on pg.5 shows typical transient duration
versus reset comparator overdrive (V
- V
), below
which the CMPWR160 will not generate a reset pulse.
In other words, the graph shows the maximum pulse
duration on a transient on V
that will not cause a
reset pulse. For example, a V
transient of 100mV
below the 2.9V threshold is detected only if it lasts for
4ms or more.
Dual Power Battery and USB Application
Some hand-held devices can be powered from two
independent supplies: either a battery or a computer
USB port 5V. These devices could also require a
regulated 3.3V. A dual CMPWR160 configuration, as
shown in Figure 16, provides uninterrupted power, so
that the device can remain fully
“
on
”
when plugged into
the USB port.
Figure 16. Dual Power USB/Battery Application
CMPWR160
CONTROLLER
3.3V
D
–
D+
D
–
D+
VBUS
VBUS
GND
GND
Rpu
1.5k
3.3V
USB
HOST
USB
CABLE
V
CC
V
CC
USB_VBUS
SD
GND
GND
POR
V
OUT
V
V
3.3V/
500mA
μP Reset
CMPWR160SA
10μF
+
–
C
IN
1μF
C
OUT
C
+
+
V
CC
V
CC
SD
GND
POR
V
OUT
V
μP Reset
CMPWR160SA
C
IN
1μF
1X
+
GND
BATTERY
SD
V
+
–
C
IN
+
+
SD
C
IN
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CMPWR160SAT | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:USB peripheral Power Management |
| CMPWR161 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower, Low Noise 4.75V/150mA LDO Regulator |
| CMPWR161R | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower, Low Noise 4.75V/150mA LDO Regulator |
| CMPWR161Y | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower, Low Noise 4.75V/150mA LDO Regulator |
| CMPWR163-33 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Micropower, 150mA / 3.3V Low Dropout CMOS Regulator |
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