ANALOG DEVICES ADM1072 Service Manual

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Dual, USB 2.0 Full/Standby Power

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Preliminary Technical Data

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 MIRROR

FET

1A MAIN FET

MAIN_IN

(2.7V TO 5.5V)

22µF

2

3

14

15

Controller with Supply Steering

ADM1072

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 (FLT) for each channel.

The ADM1072 also offers low quiescent current of typically
50µA and shutdown current of typically 10nA.

STBY_IN

(2.7V TO

5.5V)

Rev. PrE 1/02

4.7µF

ON1

STBY

ON2

5

12

11

9

10

TO

CHANNEL 2

TO

CHANNEL

2

0.2A MAIN FET

0.2A

MIRROR FET

CONTROL

LOGIC

UNDERVOLTAGE

SENSOR

TEMPERATURE

SENSOR

CHANNEL

CHANNEL 2 IS IDENTICAL TO CHANNEL 1

ADM1072

OVERTEMP

TO

2

CURRENT

AMPLIFIER

FUNCTIONAL BLOCK DIAGRAM

AMPLIFIER

LIMIT

TO

CHANNEL

2

MIRROR

1.24V

BANDGAP

REFERENCE

CURRENT

SETTING

RESISTOR

1

4

120µF

V

PULLUP

0 TO

5.5V

R

10k⍀ TO

FLT1

6

V

PULLUP

0 TO 5.5V

GND

8

FLT2

7

13

16

120µF

R

10k⍀ TO 100k⍀

OP1

PULLUP

100k⍀

PULLUP

OP2

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: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

ADM1072–SPECIFICATIONS

(Specification for either channel 1 or channel 2, VIN = +5.0V, TA = -40 to +85oC, unless otherwise noted.)

Parameter Min Typ Max Units Test Conditions/Comments
Operating Voltage Range +2.7 +5.5 Volts
Quiescent Current (Total Device) 50 µA VIN = 5V, ON1,ON2 = GND, I
Shutdown Supply Current (Total Device) 0.01 2 µA ON1,ON2 = VIN = 5.5V, V
Undervoltage Lockout 2.0 2.3 2.6 V V
On Resistance ? 135 m⍀ V

, Rising Edge, 1% Hysteresis

STBY_IN

= 4.75V

IN

?? m⍀ VIN = 3.0V

NOMINAL CURRENT-LIMIT
Full Power Mode 0.8 1.0 1.2 A STBY Low Note 1
Standby Mode 160 200 240 mA STBY High Note 1

ON1,ON2, STBY Input Low Voltage, V

IL

0.8 V VIN = 2.7V to 5.5V

ON1,ON2, STBY Input High Voltage, VIH2.4 V VIN = 2.7V to 5.5V
ON1,ON2, STBY Input Leakage 0.01 ±1 µA V
FLT1,FLT2 Logic Output Low Voltage 0.4 V I
FLT1,FLT2 Output High Leakage Current 0.05 1 µA V

Turn-On Time 4 ms V

4msV

ON, VSTBY

SINK

FAULT

IN
IN

Turn-Off Time ? ? 20 µs VIN = 5V, I

Notes

1

Current limit is specified with V

2

Guaranteed by design. Derived from the I

3

Tested with I

4

Specifications to -40oC are guaranteed by design, not tested.

= 200mA and V

OUT

= 4.5V.

OUT

SET

current ratio, current-limit amplifier and internal set resistor accuraciues.

SET

adjusted until (VIN - V

) 艌 0.8V.

OUT

= 1mA

= 5.5V

= 5V, I
= 3V, I

= 5.5V

= 500mA

OUT

= 500mA

OUT

= 500mA

OUT

OUT

OUT

= 0V

= 0A

–2–

Rev. PrE 1/02

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

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

+ 0.3V)

IN

Maximum Switch Current

Full Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A

Standby Power Mode . . . . . . . . . . . . . . . . . . . . . . . . 200mA

Continuous Power Dissipation (TA = +70

QSOP (derate 8.3mW/

o

C above +70oC)

o

C) . . . . . 667mW

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 speci­fication is not implied. Exposure to absolute maximum rating conditions for
extended periods of time may affect reliability.

THERMAL CHARACTERISTICS

16-Pin QSOP Package:

q

= 105°C/Watt, q

JA

= 40°C/Watt

JC

ORDERING GUIDE

Temperature Package Package

Model Range Description Option
ADM1072ARQ -40°C to +85°C 16-Pin QSOP RQ-16

Package

OP1

1

MAIN_IN

MAIN_IN

STBY_IN

OP1

FLT1

FLT2

GND

2

3

4

ADM10 72

TOP VIEW

5

(Not to Scale)

6

7

8

Pin Configuration

ADM1072

16

OP2

15

MAIN_IN

14

MAIN_IN

OP2

13

STBY_IN

12

ON1

11

ON2

10

STBY

9

PIN FUNCTION DESCRIPTION

Pin Mnemonic Function

2, 3, 14, 15 MAIN_IN Input to MAIN P-channel MOSFET source (both channels). Bypass MAIN_IN with a

22µF capacitor to ground.

5, 12 STBY_IN Input to Standby P-channel MOSFET source (both channels) and supply to chip

circuitry. Bypass STBY_IN with a 4.7µF capacitor to ground.

1, 4 OP1 Output from channel 1, P-channel MOSFET drains. Bypass OP1 with a 120µF capacitor

to ground.

13, 16 OP2 Output from channel 2, P-channel MOSFET drains. Bypass OP2 with a 120µF capacitor

to ground.

6 FLT1 Open-Drain Digital Output. FLT1 goes low when the channel 1 current limit is

exceeded for 10mS or the die temperature exceeds +150oC. During startup, FLT1
remains low for the turn-on time.

7 FLT2 Open-Drain Digital Output. FLT2 goes low when the channel 2 current limit is

exceeded for 10mS or the die temperature exceeds +150oC. During startup, FLT2

remains low for the turn-on time.
8 GND Ground pin for all chip circuits.
9 STBY 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.
10 ON2 Digital Input. Active-low switch enable for channel 2 (logic 0 turns the switch on).
11 ON1 Digital Input. Active-low switch enable for channel 1 (logic 0 turns the switch on).

Rev. PrE 1/02

–3–