AAT4670_06 Datasheet, PDF (1/13 Pages) Advanced Analogic Technologies – Dual-Input, Dual-Output Load Switch

AAT4670
Dual-Input, Dual-Output Load Switch
General Description
Features
SmartSwitch^™
The AAT4670 SmartSwitch is a member of
AnalogicTech’s Application Specific Power MOS-
FET™ (ASPM™) product family. 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 auto-
matically derives power from the higher of the two
input power source pins with a low operating quies-
cent 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, mak-
ing 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 thresh-
old. 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.
The AAT4670 is available in a Pb-free, space-sav-
ing, thermally-enhanced TDFN 3x3x0.8mm 12-lead
package. The device is also available in a Pb-free
8-pin SOP, TSSOP, or MSOP package and is spec-
ified over the -40°C to +85°C temperature range.
• 2.2V to 5.5V Input Voltage Range
• 1A Current Limit Per Channel
• 95mΩ Typical R_DS(ON)
• Fast Transient Response:
— <1µs Response to Short Circuit
• Low 18µA Quiescent Current
• 1µA Max with Switches Off
• Slew Rate Controlled
• Thermal Shutdown
• Fault Flags with 3ms Blanking
• Under-Voltage Lockout
• Temperature Range: -40°C to +85ºC
• Available in TDFN33-12, SOP-8, TSSOP-8, or
MSOP-8 Package
Applications
• Hot Swap Supplies
• Media Bay
• Notebook Computer
• PDA, Subnotebook
• Peripheral Ports
• USB Ports
Typical Application
INA
INB
C_INA
1μF
GND
4670.2006.09.1.4
EN
C_INB
1μF
AAT4670
INA
OUTA
INB
OUTB
EN
FAULTA
GND ^FAULTB
FAULTA
FAULTB
C_OUTA
1μF
OUTA
OUTB
C_OUTB
1μF
GND
1