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| 型号： | ADM1072ARQ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | Dual, USB 2.0 Full/Standby Power Controller with Supply Steering |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | QSOP-16 |
| 文件页数： | 1/8页 |
| 文件大小： | 88K |
| 代理商： | ADM1072ARQ |
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
ADM1072
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel:
781/329-4700
World
Wde
Fax: 781/326-8703
Web
Site:
http://www.analog.com
Analog Devices, Inc., 2002
Rev. PrE 1/02
Prelimnary Technical Data
Dual, USB 2.0 Full/Standby Power
Controller wth Supply Steering
FUNCT IONAL BLOCK DIAGRAM
FEATURES
500mA Load Current (100mA in Standby Mode)
135m On Resistance
Switchable Current Limit
50μA Typical Quiescent Current
10nA Typical Shutdown Current
40nA Typical Switch Off Leakage
Short-Circuit Protection
Thermal Shutdown
Outputs
Small, 16-Pin QSOP Package
APPLICATIONS
Desktop Computers
Palmtop Computers
Notebook Computers
Hand-Held Instruments
Universal Serial Bus (USB
)
GENERAL DESC RIPT ION
T he ADM1072 is a logic controlled, dual P-channel switch
with low on resistance and a built-in current limiter, capable of
sourcing up to 1A from supply voltages between 2.7V and
5.5V. In addition to logic inputs that switch each channel on
and off, the device has a standby input that switches the output
current limit, making it ideal for use with USB peripherals. In
normal operating mode and Standby mode the output current
is typically limited to 500mA and 100mA respectively, as
outlined by the USB2.0 Specification. T his allows the system
power supply to be protected against short-circuits and surge
currents in peripheral USB devices powered via the ADM1072.
Over-current and over-temperature conditions are signalled by
a fault output
for each channel.
T he ADM1072 also offers low quiescent current of typically
50μA and shutdown current of typically 10nA.
4
120μF
5
0.2A MAIN FET
0.2A
MIRROR FET
MIRROR
AMPLIFIER
MAIN_IN
(2.7V TO 5.5V)
4.7μF
3
TEMPERATURE
SENSOR
7
14
CURRENT
LIMIT
AMPLIFIER
ON1
1.24V
BANDGAP
REFERENCE
OVERTEMP
ADM1072
10
CURRENT
SETTING
RESISTOR
R
PULLUP
10k TO 100k
V
PULLUP
0 TO 5.5V
FLT2
8
15
11
GND
CHANNEL 2 IS IDENTICAL TO CHANNEL 1
TO
CHANNEL 2
13
OP2
120μF
R
PULLUP
10k TO
100k
V
PULLUP
0 TO
5.5V
FLT1
6
STBY
ON2
UNDERVOLTAGE
SENSOR
TO
CHANNEL
2
TO
CHANNEL
2
TO
CHANNEL
2
9
2
1A MIRROR
FET
1A MAIN FET
12
STBY_IN
(2.7V TO
5.5V)
22μF
OP1
16
CONTROL
LOGIC
1
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