Application Specific Power Management SmartSwitch鈩?/div>
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擄C to +85擄C temperature range.
Power Supply Selector Switch
Features
鈥?Input Voltage Supply Range: 2.5V to 6V
鈥?High Level of Integration:
鈻?/div>
Reverse Blocking Diode
鈻?/div>
Current Sensing
鈻?/div>
Programmable Current Limit
鈻?/div>
Single Control Pin Switching
鈥?Break-Before-Make Switch-Over
鈻?/div>
Minimum Output Voltage Drop During Change-Over
鈥?Shutdown Current < 1渭A
鈥?Thermal Protection
鈥?TSOPJW-12 Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Bluetooth鈩?Headsets
Cell Phones
Digital Still Cameras
MP3 Players
Personal Data Assistants (PDAs)
Set Top Boxes
Typical Application
+5V
+3.3V
IN1/IN2 Select
IN1
OUT
IN2
IIN1
SEL
IIN2
R
IIN2
R
IIN1
System Load
Enable
EN
GND
4674.2008.02.1.1
www.analogictech.com
1
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