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AAT4650 데이터시트 PDF




Advanced Analogic Technologies에서 제조한 전자 부품 AAT4650은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AAT4650 기능
기능 5V/3V PC Card Power Switch
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AAT4650 데이터시트, 핀배열, 회로
General Description
The AAT4650 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 four
states for VCC are VCC5, VCC3, Hi-impedance, or
Ground. When in the ground state, VCC is pulled to
ground by a 5kresistor. An open drain FAULT out-
put is asserted during over-current conditions.
During power up slewing, FAULT also signals that
VCC is out of tolerance. An internal over temperature
sensor forces VCC to a high impedance state when
an over-temperature condition exists. Quiescent
current 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 AAT4650 is available in 8-pin SOP and
TSSOP packages specified over -40 to 85°C.
AAT4650
5V/3V PC Card Power Switch
Features
SmartSwitch
• 2.7V to 5.5V Input voltage range
• 85m(5V) typical RDS(ON)
• Low quiescent current 15µA (typ)
• Reverse-blocking switches
• Short-circuit protection
• Over-temperature protection
• FAULT flag output
• Temp range -40 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
CTL1
CTL0
FAULT
CIN3
1µF
8 VCC5
5 VCC3
3 CTL1 AAT4650
2 CTL0
4 FAULT
1 GND
VCC 6,7
COUT
0.1µF
VCC
GND
4650.2001.10.0.93
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AAT4650 pdf, 반도체, 판매, 대치품
AAT4650
5V/3V PC Card Power Switch
Symbol Description
Power Supply
VCC3
VCC5
VCC3 Operation Voltage
VCC5 Operation Voltage
ICC3
VCC3 Supply Current
ICC5
VCC5 Supply Current
Parallel Interface
VCTLLOW
VCTLHI
CTL Input Low Voltage
CTL Input High Voltage
ISINKCTL
VFAULTLOW
ISINKFAULT
Other
OTMP
CTL Input leakage
FAULT Logic Output Low
Voltage
FAULT Logic Output High
Leakage Current
Over Temperature Shutdown
Conditions
VCC=5V or HiZ or OFF,
VCC3<VCC5, ICC Out=0
VCC=3.3v, VCC3<VCC5, ICC Out=0
VCC=Off, VCC5>VCC3, ICC Out=0
VCC=HiZ, VCC5>VCC3, ICC Out=0
VCC=3.3v, VCC5>VCC3 ,ICC Out=0
VCC=5v, VCC5>VCC3, ICC Out=0
VCC3 or VCC5=2.7 to 3.6V
VCC3 or VCC5=4.5 to 5.5V
VCTL = 5.5V
ISINK=1mA
VFAULT= 5.5V
Min Typ Max Units
2.7 5.5 V
2.7 5.5 V
1 µA
5 20 µA
1 µA
10 40 µA
10 40 µA
15 40 µA
0.8
2.0
2.4
0.01 1
0.4
V
V
V
µA
V
0.05 1
µA
125 degC
Timing Diagram
5 CTL0,1
0
5
Vcc
0
t1, t2 t3, t4
t5, t6 t7, t8
t9, t10
Figure 1: VCC Switching Time Diagram
Refer to VCC Switching Time specifications under the Electrical Characteristics section for definitions of t1
to t10.
4 4650.2001.10.0.93

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AAT4650 전자부품, 판매, 대치품
Functional Block Diagram
VCC 3
AAT4650
5V/3V PC Card Power Switch
VCC 5
Body Ctl
VCC
Over
Current
Over
Temperature
Slew
Rate
C TL1
C TL0
Control
Logic
Over
Current
Slew
Rate
5K
FAULT
GND
Functional Description
The AAT4650 is a single channel power switch that
can be used in any application where dual power
supply multiplexing is required. Typical applications
for this include PC card applications not requiring a
12 volt power supply, or applications where power is
switched, for example, between 5 volts for operation
and 3.3 volts for standby mode. The AAT4650 oper-
ates with input voltages ranging from 2.7 to 5.5 volts
in any combination and automatically powers its
internal circuitry off of whichever input voltage is
higher. Two identical low RDS P-channel MOSFETS
serve as the power multiplexing circuit with a com-
mon drain as the Vcc output and independent
sources as the two Vcc3 and Vcc5 inputs. A two bit
parallel interface determines the state of the multi-
plexer: Vcc=Vcc3, Vcc=Vcc5, Vcc with resistive pull
down to ground, or Vcc hi-impedance. When the
state is set to either of the two inputs, the multiplex-
4650.2001.10.0.93
ing circuit will slowly slew the VCC output to the new
voltage level which protects the upstream power
supply from sudden load transients. When the
resistive pull down is chosen for VCC, the VCC output
is quickly discharged by the resistive pull down.
The AAT4650 always serves as an electronic fuse
by limiting the load current if it exceeds the current
limit threshold. During power up into a short, the
current will gradually increase until the current limit
is reached. During a sudden short circuit on the out-
put, the current limit will respond in 1 µs to isolate
and protect the upstream power supply from the
load short circuit. In most applications, because the
response time is so fast, a short circuit to VCC will
not affect the upstream supply, so system function-
ality will not be affected. In the case of an over cur-
rent condition, an open drain FAULT flag output will
signal the event. The FAULT output is also active
during output voltage slew, and becomes inactive
once the output is within regulation.
7

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