AAT4650
5V/3V PC Card Power Switch
General Description
The AAT4650 SmartSwitch鈩?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 four
states for V
CC
are V
CC
5, V
CC
3, Hi-impedance, or
Ground. When in the ground state, V
CC
is pulled to
ground by a 5k鈩?resistor. An open drain FAULT out-
put is asserted during over-current conditions.
During power up slewing, FAULT also signals that
V
CC
is out of tolerance. An internal over temperature
sensor forces V
CC
to a high impedance state when
an over-temperature condition exists. Quiescent
current 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 AAT4650 is available in 8-pin SOP and
TSSOP packages specified over -40 to 85擄C.
Features
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鈥?/div>
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SmartSwitch
鈩?/div>
2.7V to 5.5V Input voltage range
85m鈩?(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
Temp range -40 to 85擄C
8 pin SOP or TSSOP package
Preliminary Information
Applications
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Notebook Computer
PDA, Subnotebook
Power Supply Multiplexer Circuit
Typical Application
V
CC
5
V
CC
3
CTL1
CTL0
FAULT
C
IN5
1碌F
C
IN3
1碌F
8
5
3
2
4
1
V
CC
5
V
CC
3
V
CC
CTL1
AAT4650
CTL0
FAULT
GND
6,7
V
CC
C
OUT
0.1碌F
GND
GND
4650.2001.10.0.93
1
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