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G61
ADM1072
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2002
Rev. PrE 1/02
Preliminary Technical Data
Dual, USB 2.0 Full/Standby Power
Controller with Supply Steering
FUNCTIONAL BLOCK DIAGRAM
FEATURES
500mA Load Current (100mA in Standby Mode)
135mH9024 On Resistance
Switchable Current Limit
50µA Typical Quiescent Current
10nA Typical Shutdown Current
40nA Typical Switch Off Leakage
Short-Circuit Protection
Thermal Shutdown
G46G4CG54 Outputs
Small, 16-Pin QSOP Package
APPLICATIONS
Desktop Computers
Palmtop Computers
Notebook Computers
Hand-Held Instruments
Universal Serial Bus (USB)
GENERAL DESCRIPTION
The 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. This 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 G28G46G4CG54G29 for each channel.
The 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
10kH9024 TO 100kH9024
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
10kH9024 TO
100kH9024
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