PRELIMINARY TECHNICAL DATA
=
Dual, USB 2.0 Full/Standby Power
Controller with Supply Steering
Preliminary Technical Data
ADM1072
GENERAL DESCRIPTION
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
FLT
Outputs
Small, 16-Pin QSOP Package
APPLICATIONS
Desktop Computers
Palmtop Computers
Notebook Computers
Hand-Held Instruments
Universal Serial Bus (USB)
1A MAIN FET
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
(FLT)
for each channel.
The ADM1072 also offers low quiescent current of typically
50µA and shutdown current of typically 10nA.
MAIN_IN
(2.7V TO 5.5V)
22µF
2
3
14
15
1A MIRROR
FET
STBY_IN
(2.7V TO
5.5V)
0.2A MAIN FET
5
12
1
OP1
4.7µF
TO
CHANNEL 2
0.2A
MIRROR FET
MIRROR
AMPLIFIER
4
120µF
O N 1
11
CONTROL
LOGIC
V
PULLUP
0 TO
5.5V
CURRENT
LIMIT
AMPLIFIER
1.24V
BANDGAP
REFERENCE
FLT1
6
R
PULLUP
10k TO
100k
STBY
9
UNDERVOLTAGE
SENSOR
ADM1072
CURRENT
SETTING
RESISTOR
V
PULLUP
0 TO 5.5V
TEMPERATURE
SENSOR
OVERTEMP
8
GND
10k
FLT2
R
PULLUP
TO 100k
7
TO
CHANNEL
2
TO
CHANNEL
2
TO
CHANNEL
2
13
16
OP2
O N 2
10
CHANNEL 2 IS IDENTICAL TO CHANNEL 1
120µF
FUNCTIONAL BLOCK DIAGRAM
Rev. PrE 1/02
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.
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
PRELIMINARY TECHNICAL DATA
ADM1072–SPECIFICATIONS
(Specification for either channel 1 or channel 2, V
IN
= +5.0V, T
A
= -40 to +85
o
C, unless otherwise noted.)
Parameter
Operating Voltage Range
Quiescent Current (Total Device)
Shutdown Supply Current (Total Device)
Undervoltage Lockout
On Resistance
NOMINAL CURRENT-LIMIT
Full Power Mode
Standby Mode
ON1,ON2,
STBY Input Low Voltage, V
IL
ON1,ON2,
STBY Input High Voltage, V
IH
ON1,ON2,
STBY Input Leakage
FLT1,FLT2
Logic Output Low Voltage
FLT1,FLT2
Output High Leakage Current
Turn-On Time
Turn-Off Time
?
?
0.05
2.4
0.01
±1
0.4
1
4
4
20
2.0
Min
+2.7
50
0.01
2.3
?
?
0.8
160
1.0
200
2
2.6
135
?
1.2
240
0.8
Typ
Max
+5.5
Units
Volts
µA
µA
V
m
m
A
mA
V
V
µA
V
µA
ms
ms
µs
V
IN
= 5V,
ON1,ON2
= GND, I
OUT
= 0A
ON1,ON2
= V
IN
= 5.5V, V
OUT
= 0V
V
STBY_IN
, Rising Edge, 1% Hysteresis
V
IN
= 4.75V
V
IN
= 3.0V
STBY Low Note 1
STBY High Note 1
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
V
ON,
V
STBY
= 5.5V
I
SINK
= 1mA
V
FAULT
= 5.5V
V
IN
= 5V, I
OUT
= 500mA
V
IN
= 3V, I
OUT
= 500mA
V
IN
= 5V, I
OUT
= 500mA
Test Conditions/Comments
Notes
1
Current limit is specified with V
OUT
= 4.5V.
2
Guaranteed by design. Derived from the I
SET
current ratio, current-limit amplifier and internal set resistor accuraciues.
3
Tested with I
OUT
= 200mA and V
SET
adjusted until (V
IN
- V
OUT
) 0.8V.
4
Specifications to -40
o
C are guaranteed by design, not tested.
–2–
Rev. PrE 1/02
PRELIMINARY TECHNICAL DATA
ADM1072
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
O P1
M AIN _IN
M AIN _IN
O P1
S T BY _IN
F LT 1
F LT 2
G ND
1
2
3
4
5
6
7
8
16 O P2
15 M AIN _IN
14 M AIN _IN
MAIN_IN to GND . . . . . . . . . . . . . . . . . . . . . . –0.3V to +6V
ON1,ON1,FLT1, FLT2
to GND . . . . . . . . . . . –0.3V to +6V
OP1,OP2
to GND . . . . . . . . . . . . . . . . +0.3 V to (V
IN
+ 0.3V)
Maximum Switch Current
Full Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Standby Power Mode . . . . . . . . . . . . . . . . . . . . . . . . 200mA
Continuous Power Dissipation (TA = +70
o
C) . . . . . 667mW
QSOP (derate 8.3mW/
o
C above +70
o
C)
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300°C
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this speci-
fication is not implied. Exposure to absolute maximum rating conditions for
extended periods of time may affect reliability.
AD M 10 72
T O P V IE W
(No t to S cale)
13 O P2
12 S T BY _IN
11
O N 1
10
O N 2
9
S T BY
Pin Configuration
THERMAL CHARACTERISTICS
16-Pin QSOP Package:
q
JA
= 105°C/Watt,
q
JC
= 40°C/Watt
ORDERING GUIDE
Model
ADM1072ARQ
Temperature
Range
-40°C to +85°C
Package
Description
16-Pin QSOP
Package
Option
RQ-16
Package
PIN FUNCTION DESCRIPTION
Pin
2, 3, 14, 15
5, 12
1, 4
13, 16
6
Mnemonic
MAIN_IN
STBY_IN
OP1
OP2
FLT1
Function
Input to MAIN P-channel MOSFET source (both channels). Bypass MAIN_IN with a
22µF capacitor to ground.
Input to Standby P-channel MOSFET source (both channels) and supply to chip
circuitry. Bypass STBY_IN with a 4.7µF capacitor to ground.
Output from channel 1, P-channel MOSFET drains. Bypass OP1 with a 120µF capacitor
to ground.
Output from channel 2, P-channel MOSFET drains. Bypass OP2 with a 120µF capacitor
to ground.
Open-Drain Digital Output.
FLT1
goes low when the channel 1 current limit is
exceeded for 10mS or the die temperature exceeds +150
o
C. During startup,
FLT1
remains low for the turn-on time.
Open-Drain Digital Output.
FLT2
goes low when the channel 2 current limit is
exceeded for 10mS or the die temperature exceeds +150
o
C. During startup,
FLT2
remains low for the turn-on time.
Ground pin for all chip circuits.
Digital Input. Active high standby mode input. STBY = 0 sets normal operating mode
with 500mA current limit. STBY = 1 sets standby mode with 100mA current limit.
Digital Input. Active-low switch enable for channel 2 (logic 0 turns the switch on).
Digital Input. Active-low switch enable for channel 1 (logic 0 turns the switch on).
7
FLT2
8
9
10
11
GND
STBY
ON2
ON1
Rev. PrE 1/02
–3–
PRELIMINARY TECHNICAL DATA
ADM1072
Typical Performance Curves
IT
A
AW
TA
DA
NG
I
NG
TI
AI
AW
TA
DA
Figure 4. Off-Switch Current vs. Temperature
Figure 1. Quiescent Current vs. Input Voltage
NG
IT I
A
AW
TA
DA
Figure 2. Quiescent Current vs. Temperature
IN G
IT
A
AW
TA
DA
Figure 5. Normalized On Resistance vs. Temperature
NG
IT I
A
AW
TA
DA
Figure 3. Off-Supply Current vs. Temperature
NG
IT I
A
AW
TA
DA
Figure 6. I
OUT
/I
SET
Ratio vs Switch Current
–4–
Rev. PrE 1/02
PRELIMINARY TECHNICAL DATA
ADM1072
Typical Performance Curves
NG
IT I
A
AW
TA
DA
Figure 7. Normalized Output Current vs. Output Voltage
NG
IT I
A
AW
TA
DA
Figure 10. Fast Current-Limit Response
NG
IT I
A
AW
TA
DA
Figure 8. Turn-On Time vs. Temperature
NG
IT I
A
AW
TA
DA
Figure 11. Slow Current-Limit Response
NG
IT I
A
AW
TA
DA
Figure 9. Turn-Off Time vs. Temperature
NG
IT I
A
AW
TA
DA
Figure 12. Load Transient Response
Rev. PrE 1/02
–5–
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