AAT4674_12 Datasheet, PDF (1/12 Pages) Skyworks Solutions Inc. – Power Supply Selector Switch

General Description
The AAT4674-1 is a member of Skyworks' Application
Specific Power Management SmartSwitch™ family. This
device is a dual input single output power supply selector
switche designed to operate from batteries, or any other
power supply with an input voltage up to 6V.
The AAT4674-1 connects the supply voltage on IN1 to
OUT, or IN2 to OUT, through a very low R_DS(ON) power
MOSFET that minimizes voltage drops and power dissi-
pation. The enable (EN) and select (SEL) pin voltages
control the operational state of the internal power
MOSFET switches. Once enabled, the SEL pin will switch
between the IN1 and IN2 inputs. If both input voltages
are below the UVLO, then the AAT467-1 output floats. If
one of the input voltages is above the UVLO threshold
then that input voltage that is above the UVLO threshold
is passed through to the output.
The two power switches are current limited and the cur-
rent limit thresholds can be programmed through the
resistors on IIN1 and IIN2 pins respectively.
The AAT4674-1 is available in the thermally enhanced,
space-saving Pb-free 12-pin TSOPJW package. The 4674-
1 is specified for operation over the -40°C to +85°C
temperature range.
DATA SHEET
AAT4674
Power Supply Selector Switch
Features
• Input Voltage Supply Range: 2.5V to 6V
• High Level of Integration:
▪ Reverse Blocking Diode
▪ Current Sensing
▪ Programmable Current Limit
▪ Single Control Pin Switching
• Break-Before-Make Switch-Over
▪ Minimum Output Voltage Drop During Change-Over
• Shutdown Current < 1μA
• Thermal Protection
• TSOPJW-12 Package
Applications
• Bluetooth™ Headsets
• Cell Phones
• Digital Still Cameras
• MP3 Players
• Personal Data Assistants (PDAs)
• Set Top Boxes
Typical Application
+5V
IN1
+3.3V
IN2
IN1/IN2 Select
SEL
Enable
EN
OUT
IIN1
IIN2
GND
System Load
R_IIN2
R_IIN1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201911A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
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