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PDF AAT4651 Data sheet ( Hoja de datos )
| Número de pieza | AAT4651 | |
| Descripción | 5V/3V PC Card Power Switch | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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General Description
The AAT4651 SmartSwitch is a single channel PC
card (PCMCIA) power switch. It is used to select
between two different voltage inputs, each between
2.7V and 5.5V. An internal switch powers the cir-
cuitry from whichever input voltage is higher. The
device's output, VCC, is slew rate controlled and cur-
rent limited, in compliance with PC card specifica-
tions. The current limit response time to a short cir-
cuit is typically 1µs. The internal P-channel MOS-
FET switches are configured to break before make;
that is, both switches cannot be closed at the same
time. Controlled by a 2-bit parallel interface, the
three states for VCC are VCC5, VCC3, or ground.
When in the ground state, VCC is pulled to ground by
an 200Ω resistor. An open drain FAULT output is
asserted during over-current conditions. During
power-up slewing, FAULT also signals that VCC is
out of tolerance. An internal over-temperature sen-
sor forces VCC to a high impedance state when an
over-temperature condition exists. Quiescent cur-
rent is typically a low 15µA, as long as ICC is less
than approximately 500mA. Above this load current,
the quiescent current increases to 200µA.
The AAT4651 is available in a Pb-free, 8-pin SOP
or TSSOP package and is specified over the -40°C
to +85°C temperature range.
AAT4651www.DataSheet4U.com
5V/3V PC Card Power Switch
Features
SmartSwitch™
• 2.7V to 5.5V Input Voltage Range
• 80mΩ (5V) Typical RDS(ON)
• Low Quiescent Current: 15µA (Typ)
• Reverse-Blocking Switches
• Short-Circuit Protection
• Over-Temperature Protection
• FAULT Flag Output
• Temperature Range: -40°C to +85°C
• 8-Pin SOP or TSSOP Package
Applications
• Notebook Computer
• PDA, Subnotebook
• Power Supply Multiplexer Circuit
Typical Application
VCC5
VCC3
CIN5
1μF
GND
VCCD1
VCCD0
FAULT
CIN3
1μF
8 VCC5
5 VCC3
2 VCCD1
3 VCCD0
4 FAULT
1 GND
AAT4651 VCC 6,7
COUT
0.1μF
VCC
GND
4651.2006.05.1.2
1
1 page  
Typical Characteristics
Unless otherwise noted, TA = 25°C.
Quiescent Current vs. Temperature
(ICC5)
30
25 VCC3 = 3V VCCD1 = 5V
VCC5 = 5V VCCD0 = 0V
20
15
10
5
0
-40
-20
0 20 40 60 80 100 120
Temperature (°C)
Current Limit
(VCC = VCC5)
2
1.5
1
0.5
0
0123456
Output Voltage (V)
AAT4651www.DataSheet4U.com
5V/3V PC Card Power Switch
Current Limit
(VCC = VCC3)
2
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3
Output Voltage (V)
Off-Switch Current vs. Temperature
(ICC3)
1.0000
0.1000
VCC3 = 3V VCCD1 = 0V
VCC5 = 5V VCCD0 = 0V
0.0100
0.0010
0.0001
0.0000
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Off-Switch Current vs. Temperature
(ICC5)
1.0000
0.1000
VCC5 = 5V
VCC3 = 3V
VCCD1 = 0V
VCCD0 = 0V
0.0100
0.0010
0.0001
0.0000
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
RDS(ON) vs. Temperature
120.0
110.0
100.0
90.0
VCC = VCC3 = 3.0V
80.0
70.0 VCC = VCC5 = 5.0V
60.0
-40
-20
0 20 40 60 80
Temperature (°C)
100
120
4651.2006.05.1.2
5
5 Page 
Evaluation Board Layout
The AAT4651 evaluation board layout follows the
printed circuit board layout recommendations, and
can be used for good applications layout.
Note: Board layout shown is not to scale.
AAT4651www.DataSheet4U.com
5V/3V PC Card Power Switch
Figure 2: Evaluation Board Top Side
Silk Screen Layout / Assembly Drawing.
Figure 3: Evaluation Board
Component Side Layout.
4651.2006.05.1.2
Figure 4: Evaluation Board
Solder Side Layout.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT4651.PDF ] | |
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