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PDF AAT4672 Data sheet ( Hoja de datos )
| Número de pieza | AAT4672 | |
| Descripción | Power Supply Selector Switch | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT4672 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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SmartSwitchTM
General Description
The AAT4672 SmartSwitch™ is a member of AnalogicTech’s
Application Specific Power Management IC™ family. This
device is a dual input, single output power supply selec-
tor switch, designed to operate from USB ports, AC
adapter inputs, batteries, or any other power supply with
an input voltage up to 6V.
The AAT4672 connects the supply on the MAIN pin to the
OUT pin through a very low on-resistance power MOSFET
www.DatawShheeent4Ut.hcoemdevice is enabled, the MAIN pin voltage is
higher than the under voltage lockout (UVLO) threshold,
and MAIN pin voltage is greater than the AUX pin voltage
plus 200mV. The AUX pin connects to the OUT pin only
when the MAIN pin voltage drops 0.2V below the AUX pin
voltage and the AUX pin voltage is greater than the
UVLO threshold. If both input supplies (MAIN/AUX) are
below the UVLO threshold, then the OUT pin floats.
The two internal power switches are current limited and
the thresholds can be programmed through resistors on
the IMAIN and IAUX pins respectively. A power level
selection pin, PWRSEL, is provided to toggle the AUX
current limit between 100% and 20% of the current limit
setting programmed by the resistor on the IAUX pin. This
is particularly useful for USB applications where the
power supply can be powered by either a 500mA or a
100mA USB port.
The AAT4672 is available in a thermally enhanced,
space-saving, Pb-free 12-pin TSOPJW package and is
specified for operation over the -40°C to +85°C tem-
perature range.
Typical Application
PRODUCT DATASHEET
AAT4672
Power Supply Selector Switch
Features
• Input Voltage Supply Range: 2.5V to 6V
• High Level of Integration:
▪ Reverse Blocking Diode
▪ Current Sensing
▪ Programmable Current Limiting
▪ Automatic Power Supply 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)
AC Adapter
USB Port
USB H/L select
Enable
MAIN
AUX
PWRSEL
EN
OUT
IMAIN
IAUX
GND
System Load
RIAUX
RIMAIN
4672.2008.04.1.0
www.analogictech.com
1
1 page  
SmartSwitchTM
Typical Characteristics
IMAIN Shutdown Current vs. Temperature
0.8
0.6
0.4
0.2
www.DataSheet04U.com
-0.2
-0.4
-40
-15
VMAIN = 6.5V
VMAIN = 5V
VMAIN = 3.6V
VMAIN = 4.2V
10 35 60 85
Temperature (°C)
IMAIN Operation Current vs. Temperature
(IOUT = 0A)
20
18 VMAIN = 6.5V
16
14 VMAIN = 5V
12
10 VMAIN = 4.2V
8 VMAIN = 3.6V
6
4
-40 -15 10 35 60 85
Temperature (°C)
RDS(ON) vs. Temperature
250
200
VMAIN/AUX = 2.5V
150
VMAIN/AUX = 3.5V
100
50
0
-40
VMAIN/AUX = 5V
VMAIN/AUX = 6.5V
-15 10 35 60
Temperature (°C)
85
110
PRODUCT DATASHEET
AAT4672
Power Supply Selector Switch
IAUX Shutdown Current vs. Temperature
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-40
VAUX = 6.5V
VAUX = 5V
VAUX = 3.6V
VAUX = 4.2V
-15 10 35 60 85
Temperature (°C)
IAUX Operation Current vs. Temperature
(IOUT = 0A)
20
18
16
14
12
10
8
6
4
-40
VAUX = 5V
VAUX = 6.5V
VAUX = 3.6V
VAUX = 4.2V
-15 10 35 60 85
Temperature (°C)
Enable Threshold vs. Input Voltage
1.1
1.05
1
0.95
VIH(EN)
0.9
0.85
0.8
VIL(EN)
0.75
0.7
0.65
0.6
2.5
3
3.5 4
4.5 5
5.5 6
6.5
Input Voltage (V)
4672.2008.04.1.0
www.analogictech.com
5
5 Page 
SmartSwitchTM
PRODUCT DATASHEET
AAT4672
Power Supply Selector Switch
Evaluation Board Schematic
C1
4.7µF
MAIN
J1www.DataSheet4U.com
C2
4.7µF
AUX
2
1
EN
Header 2
R1
100K
U1
1 MAIN
2 MAIN
3 AUX
4 AUX
5 EN
6 GND
AAT4672
OUT
OUT
IMAIN
IAUX
SELECT
GND
12
11
10
9
8
7
GND
PWRSEL
OUT
C3
4.7µF
IMAIN
IAUX
R3
49.9K R2
49.9K
Figure 1: AAT4672 Evaluation Board Schematic.
Evaluation Board Layout
Figure 2: AAT4672 Evaluation Board
Top Side Layout.
Figure 3: AAT4672 Evaluation Board
Bottom Side Layout.
4672.2008.04.1.0
www.analogictech.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AAT4672.PDF ] | |
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