AAT4670
Dual-Input, Dual-Output Load Switches
™
SmartSwitch
General Description
Features
The AAT4670 SmartSwitch™ is part of the Analogic
Tech Application Specific Power MOSFET
(ASPM™) line of products. The AAT4670 consists
of dual, independent, 1A current limited, slew rate
controlled P-channel MOSFET power switches with
a dedicated source and drain pin assigned to each
switch. The internal circuitry automatically derives
power from the higher of the two input power source
pins with a low operating quiescent current of 18µA.
In shutdown mode, the supply current decreases to
less than 1µA. The switches operate with inputs
ranging from 2.2V to 5.5V, making them ideal for
2.5V, 3V and 5V systems. The dual configuration
permits integration of the load switch function for
systems with two different power busses.
Independent under voltage lockout circuits will shut
down the corresponding switch if its input voltage
falls below the under voltage lockout threshold. If
the die temperature reaches the thermal limit, both
switches thermal cycle off and on indefinitely without
damage until the thermal condition is removed. An
open drain FAULT output signals an over current or
over temperature condition for each channel. Input
logic levels are TTL compatible.
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2.2V to 5.5V input voltage range
1A current limit per channel
95mΩ typical RDS(ON)
Fast transient response:
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< 1µs response to short circuit
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Low 18µA quiescent current
1µA max with Switches off
Slew rate controlled
Thermal shutdown
Fault flags with 3ms blanking
Under voltage lockout
Temp range -40 to 85ºC
8-pin SOP, TSSOP or MSOP packages
Applications
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Notebook Computer
PDA, Subnotebook
USB ports
Peripheral ports
Hot swap supplies
Media bay
The AAT4670 is available in 8 pin SOP, TSSOP or
MSOP specified over -40 to 85 °C temperature
range.
Typical Application
AAT4670
7
6
1
8
INA
INB
OUTA
OUTB
INA
INB
EN
OUTA
5
2
3
OUTB
EN
FAULTA
FAULTB
FAULTA
FAULTB
GND
4
COUTA
COUTB
CINA
CINB
1µF
1µF
1µF
1µF
GND
GND
4670.2002.1.0.92
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