AAT4674_08 Datasheet, PDF (1/12 Pages) Advanced Analogic Technologies – Power Supply Selector Switch

SmartSwitch^TM
General Description
The AAT4674/4674-1 are members of AnalogicTech’s
Application Specific Power Management SmartSwitch™
family. These devices are dual input single output power
supply selector switches designed to operate from bat-
teries, or any other power supply with an input voltage
up to 6V.
The AAT4674/4674-1 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 dissipa-
tion. The enable (EN) and select (SEL) pin voltages con-
trol 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 AAT4674 output floats. In the case of
the AAT4674-1, 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 AAT4674/4674-1 are available in thermally enhanced,
space-saving Pb-free 12-pin TSOPJW packages. The
AAT4674/4674-1 are specified for operation over the
-40°C to +85°C temperature range.
PRODUCT DATASHEET
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
4674.2008.02.1.1
www.analogictech.com
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