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AAT4651 Datasheet

  • AAT4651

  • 5V/3V PC Card Power Switch

  • 14頁

  • ANALOGICTECH

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5V/3V PC Card Power Switch
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, V
CC
, 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 1碌s. 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 V
CC
are V
CC5
, V
CC3
, or ground.
When in the ground state, V
CC
is pulled to ground by
an 200惟 resistor. An open drain FAULT output is
asserted during over-current conditions. During
power-up slewing, FAULT also signals that V
CC
is
out of tolerance. An internal over-temperature sen-
sor forces V
CC
to a high impedance state when an
over-temperature condition exists. Quiescent cur-
rent is typically a low 15碌A(chǔ), as long as I
CC
is less
than approximately 500mA. Above this load current,
the quiescent current increases to 200碌A(chǔ).
The AAT4651 is available in a Pb-free, 8-pin SOP
or TSSOP package and is specified over the -40擄C
to +85擄C temperature range.
AAT4651
Features
鈥?/div>
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鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
SmartSwitch
鈩?/div>
2.7V to 5.5V Input Voltage Range
80m惟 (5V) Typical R
DS(ON)
Low Quiescent Current: 15碌A(chǔ) (Typ)
Reverse-Blocking Switches
Short-Circuit Protection
Over-Temperature Protection
FAULT Flag Output
Temperature Range: -40擄C to +85擄C
8-Pin SOP or TSSOP Package
Applications
鈥?/div>
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鈥?/div>
Notebook Computer
PDA, Subnotebook
Power Supply Multiplexer Circuit
Typical Application
VCC5
VCC3
VCCD1
VCCD0
FAULT
C
IN5
1渭F
C
IN3
1渭F
8
5
2
3
4
1
VCC5
VCC3
VCCD1
VCCD0
FAULT
GND
AAT4651
VCC
6,7
VCC
C
OUT
0.1渭F
GND
GND
4651.2006.05.1.2
1

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