AAT4674_08 ANALOGICTECH [Advanced Analogic Technologies], AAT4674_08 Datasheet

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AAT4674_08

Manufacturer Part Number
AAT4674_08
Description
Power Supply Selector Switch
Manufacturer
ANALOGICTECH [Advanced Analogic Technologies]
Datasheet
1.AAT4674_08.pdf (12 pages)
General Description
The AAT4674/4674-1 are members of Analogic Tech’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
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.
Typical Application
SmartSwitch
4674.2008.02.1.1
TM
IN1/IN2 Select
Enable
+3.3V
+5V
DS(ON)
EN
SEL
IN1
IN2
w w w . a n a l o g i c t e c h . c o m
power
Features
• Input Voltage Supply Range: 2.5V to 6V
• High Level of Integration:
• Break-Before-Make Switch-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
▪
▪
▪
▪
▪
Reverse Blocking Diode
Current Sensing
Programmable Current Limit
Single Control Pin Switching
Minimum Output Voltage Drop During Change-Over
GND
OUT
IIN1
IIN2
Power Supply Selector Switch
R
IIN2
System Load
PRODUCT DATASHEET
R
IIN1
AAT4674
1

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AAT4674_08 Summary of contents

Page 1

SmartSwitch TM General Description The AAT4674/4674-1 are members of Analogic Tech’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 ...

Page 2

SmartSwitch SmartSwitch TM TM Pin Descriptions Pin Number Name Type 1, 2 IN1 3, 4 IN2 GND I/O 8 SEL 9 IIN2 10 IIN1 11, 12 OUT O Pin Configuration 2 2 Function I Power supply ...

Page 3

SmartSwitch SmartSwitch TM TM Absolute Maximum Ratings Symbol Description V [IN1, IN2] to GND INX V [OUT, EN, IIN1, IIN2, SEL] to GND N T Maximum Soldering Temperature (at Leads) LEAD I Maximum Output Current OUT Thermal Information 2 Symbol ...

Page 4

SmartSwitch SmartSwitch TM TM Electrical Characteristics -40 to +85°C, unless otherwise noted. Typical values are at T INX A Symbol Description Operation V IN1 Operating Voltage Range IN1 V IN2 Operating Voltage Range IN2 V ...

Page 5

SmartSwitch SmartSwitch TM TM Typical Characteristics I Shutdown Current vs. Temperature IN1 0.8 0.6 V IN1 0 IN1 0 3.6V IN1 -0.2 V IN1 -0.4 -40 - Temperature (°C) I Operation Current ...

Page 6

SmartSwitch SmartSwitch TM TM Typical Characteristics I Sleep Current vs. V IN1 IN1 (V = 6.5V) IN2 2.5 85°C 2 25°C 1.5 1 -40°C 0.5 0 2.5 3 3.5 4 4.5 V Voltage (V) IN1 Current Limit vs. R IIN1/IIN2 ...

Page 7

SmartSwitch SmartSwitch TM TM Typical Characteristics 3.6V to 3.6V Transition Response (I = 500mA 10µF) OUT OUT V OUT (1V/div) 3.6V 3. SEL 0V (2V/div) Time (40µs/div) Short Circuit Through 0.6Ω Ω Response ...

Page 8

SmartSwitch SmartSwitch TM TM Functional Block Diagram IN1 IIN1 SEL IIN2 IN2 Truth Table Y = Yes No don’t care. Input Conditions V > UVLO V IN1 IN2 Functional Description To ...

Page 9

SmartSwitch TM Output Capacitor A 1μF or greater capacitor is required between OUT and GND ( with the input capacitor, there is no spe- OUT cific capacitor ESR requirement. If desired, C increased to accommodate any load transient ...

Page 10

SmartSwitch TM For example, for a 2.5V input power supply application that is specified to operate in 50°C environments where the PCB operates at temperatures as high as 85°C. The application is sealed and its PCB is small, causing R ...

Page 11

SmartSwitch SmartSwitch TM TM Evaluation Board Schematic C1 2.2μF C2 2.2μF J1 Header 2 Figure 1: AAT4674/AAT4674-1 Evaluation Board Schematic. Evaluation Board Layout Figure 2: AAT4674/AAT4674-1 Evaluation Board Top Side Layout. 4674.2008.02.1.1 4674.2008.02.1.1 U1 MAIN 1 IN1 OUT 2 IN1 ...

Page 12

SmartSwitch SmartSwitch TM TM Ordering Information Package TSOPJW-12 TSOPJW-12 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by ...

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