AAT4651 SmartSwitchis single channel Card (PCMCIA) power switch. used

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AAT4651 SmartSwitchis single channel Card (PCMCIA) power switch. used

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5V/3V Card Power Switch General Description
AAT4651 SmartSwitchis single channel Card (PCMCIA) power switch. used select between different voltage inputs, each between 2.7V 5.5V. internal switch powers circuitry from whichever input voltage higher. device's output, VCC, slew rate controlled current limited, compliance with Card specifications. current limit response time short circuit typically 1µs. internal P-Channel MOSFET switches configured break before make, that both switches cannot closed same time. Controlled parallel interface, three states VCC5, VCC3, Ground. When ground state, pulled ground resistor. open drain FAULT output asserted during over-current conditions. During power slewing, FAULT also signals that tolerance. internal over temperature sensor forces high impedance state when over-temperature condition exists. Quiescent current typically 15µA, long less than approximately 500mA. Above this load current, quiescent current increases 200µA. AAT4651 available 8-pin TSSOP packages specified over 85°C.
AAT4651
SmartSwitch
2.7V 5.5V Input voltage range (5V) typical RDS(ON) quiescent current 15µA (typ) Reverse-blocking switches Short-circuit protection Over-temperature protection FAULT flag output Temp range 85°C TSSOP package
Applications
Notebook Computer PDA, Subnotebook Power Supply Multiplexer Circuit
Typical Application
VCC5 VCC3 VCCD1 VCCD0 FAULT
CIN5 CIN3
VCC5 VCC3 VCCD1 VCCD0 FAULT
AAT4651
COUT 0.1µF
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5V/3V Card Power Switch Descriptions
AAT4651
Symbol
VCCD1 VCCD0 FAULT VCC3 VCC5
Function
Ground connection Control input (see Control Logic Table below) Control input (see Control Logic Table below) Open drain output signals over-current condition supply Output (see Control Logic Table below) Output (see Control Logic Table below) supply
Configuration
SO-8 TSSOP-8 (Top View)
VCCD1 VCCD0 FAULT
VCC5 VCC3
Control Logic Table
VCCD1
VCCD0
Function
3.3V
Result
VCC=VCC3 VCC=VCC5
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5V/3V Card Power Switch Absolute Maximum Ratings
Symbol
VCC3, VCC5 IMAX VESD
AAT4651
(TA=25°C unless otherwise noted) Value
-0.3 -0.3 Current Limited 4000
Description
Maximum Continuous Switch Current Operating Junction Temperature Range Rating1
Units
Note: Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum rating should applied time. Note Human body model 100pF capacitor discharged through 1.5k resistor into each pin.
Thermal Characteristics
Symbol
Description
Thermal Resistance (SOP-8) Thermal Resistance (TSSOP-8)2 Power Dissipation (SOP-8)2 Power Dissipation (TSSOP-8)2
Value
Units
°C/W °C/W
Note Mounted board.
Electrical Characteristics
Symbol Description
Output Iccsc Short Circuit Current Limit
(VCC5 5.0V, VCC3 3.3V, 85°C unless otherwise noted. Typical values TA=25°C; bold values designate full temperature range) Conditions Units
RDS(ON) On-Resistance RCLAMP Clamp Resistance Tcrds Switch Resistance Tempco Switching Time (Refer Figure Output Turn-On Delay Time Output Turn-On Delay Time Output Rise Time Output Rise Time Output Turn-Off Delay Time Output Turn-Off Delay Time Output Fall Time State Output Fall Time State
VCC=VCCIN -0.5V, mode VCC3 VCC5 selected, TA=25°C VCC=3.0v, TA=25°C VCC=5.0v, TA=25°C clamped GND, ICCOUT =10mA sinking
2800 ppm/°C 2000 1500 3000 3000
VCC=0v 3.3V, ROUT=10 VCC=0v 5.0V, ROUT=10 VCC=10% 3.3V, RLOAD=10 VCC=10% 5.0V, RLOAD=10 VCC=3.3 3.3V, RLOAD=10 VCC=5.0 5.0V, RLOAD=10 VCC=90% 3.3V, RLOAD=10 VCC=90% 5.0V, RLOAD=10
1000 1000
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5V/3V Card Power Switch
Symbol Description Conditions
VCC=5V OFF, VCC3<VCC5, Out=0 VCC=3.3v, VCC3<VCC5, Out=0 VCC=Off, VCC5>VCC3, Out=0 VCC=3.3v, VCC5>VCC3 ,ICC Out=0 VCC=5v, VCC5>VCC3, Out=0 VCC3 VCC5=3.0 5.5V VCC3 VCC5=2.7 3.6V VCC3 VCC5=4.5 5.5V VCTL 5.5V ISINK=1mA VFAULT= 5.5V
AAT4651
Units
Power Supply VCC3 VCC3 Operation Voltage VCC5 VCC5 Operation Voltage ICC3 VCC3 Supply Current
ICC5
VCC5 Supply Current
Parallel Interface VCCD VCCD Input Voltage VCCD VCCD Input High Voltage ISINK VCCD VFAULTLOW ISINKFAULT Other OTMP VCCD Input leakage FAULT Logic Output Voltage FAULT Logic Output High Leakage Current Over Temperature Shutdown
0.01
0.05
degC
Note VCCD outside this range consult Typical VCCD Threshold curve.
Timing Diagram
VCCD0,1
Figure Switching Time Diagram Refer Switching Time specifications under Electrical Characteristics section definitions
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5V/3V Card Power Switch Typical Characteristics
(Unless otherwise noted, 25°C)
Quiescent Current Temperature (ICC5)
AAT4651
Current Limit VCC=VCC3
Quiescent Current (µA)
VCC3=3V VCC5=5V
VCCD1=5V VCCD0=0V
Ta=25C
Temperature
Vout
Current Limit VCC=VCC5
Off-Switch Current (µA)
Off-Switch Current Temperature (ICC3)
1.0000 0.1000 0.0100 0.0010 0.0001 0.0000
Ta=25C
VCC3=3V VCC5=5V
VCCD1=0V VCCD0=0V
Vout
Temperature
Off-Switch Current Temperature ICC5
Off-Switch Current (µA)
1.0000 0.1000 0.0100 90.0 0.0010 0.0001 0.0000 80.0 70.0 60.0 120.0
Rdson Temperature
VCC5=5V VCC3=3V
VCCD1=0V VCCD0=0V
110.0 100.0
VCC=VCC3=3.0V VCC=VCC5=5.0V
Temperature
Temperature
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5V/3V Card Power Switch
(Unless otherwise noted, 25°C)
AAT4651
Turn-ON/OFF Response with load (VCCD1
Turn-ON/OFF Response with load (VCCD0
VCCD0(5V/div)
FAULT (5V/div)
VCCD1(5V/div) FAULT (5V/div) (2V/div) IVCC5 (200mA/div)
500µs/div
(2V/div) IVCC3 (200mA/div)
500µs/div
Thermal Shutdown Response (VCCD0
Short Circuit Through
Input Output
VCCD1 (5V/div) FAULT (5V/ div)
(1V/ div)
Output Current
Output Voltage
IVCC5 (500mA/ div)
100ms
Time (µs)
Short Circuit Through
VCCD Threshold
VCCD Threshold Voltage
Input Output
Output Current Output Voltage
Output
Input Voltage
VCCDH VCCDL
Time (µs)
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Output
Input Voltage
5V/3V Card Power Switch Functional Block Diagram
AAT4651
Body
Over Current
Over Current
Over Temperature
Slew Rate
Slew Rate
FAULT
VCCD1 VCCD0
Control Logic
Functional Description
AAT4651 single channel power switch that used application where dual power supply multiplexing required. Typical applications this include card applications requiring volt power supply, applications where power switched, example, between volts operation volts standby mode. AAT4651 operates with input voltages ranging from volts combination automatically powers internal circuitry whichever input voltage higher. identical P-channel MOSFETS serve power multiplexing circuit with common drain output independent sources Vcc3 Vcc5 inputs. parallel interface determines state multiplexer: Vcc=Vcc3, Vcc=Vcc5, with resistive pull down ground. When state either inputs, multiplexing circuit will slowly
slew output voltage level which protects upstream power supply from sudden load transients. When resistive pull down chosen VCC, output quickly discharged resistive pull down. AAT4651 always serves electronic fuse limiting load current exceeds current limit threshold. During power into short, current will gradually increase until current limit reached. During sudden short circuit output, current limit will respond isolate protect upstream power supply from load short circuit. most applications, because response time fast, short circuit will affect upstream supply, system functionality will affected. case over current condition, open drain FAULT flag output will signal event. FAULT output also active during output voltage slew, becomes inactive once output within regulation.
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5V/3V Card Power Switch Applications Information
Input Capacitor
Typically larger capacitor recommended CIN. capacitor required basic operation, however, useful preventing load transients from affecting stream circuits. should located close device practically possible. Ceramic, tantalum aluminum electrolytic capacitors selected CIN. There specific capacitor requirement CIN. However, higher current operation, ceramic capacitors recommended their inherent capability over tantalum capacitors withstand input current surges from impedance sources such batteries portable devices. AAT4651 dominated voltage regulation rather than thermal considerations, either current limit maximum P-channel MOSFET. maximum 85°C calculated applying Tempco maximum room temperature RDS: RDS(MAX) RDS25 T)), RDS(MAX) 100m (0.0028 60)) 116.8m maximum current equal tolerance volt supply (100mV) across AAT4651 divided RDS(MAX). IMAX5 100mV 116.8m 856.2mA volt supply card application, conditions relaxed, with allowable voltage regulation drop equal 300mV. With supply, trace regulation, card switch have 200mV drop. IMAX3 200mV 134m 1.5A Since 1.5A nominal current limit value, AAT4651 will current limit before IMAX3 reached. Thermal issues problem SO-8 package since package thermal resistance, only 120°C/W. given ambient temperature (TA) maximum package power dissipation determined following equation: PD(MAX) [TJ(MAX) Constants AAT4651 maximum junction temperature, TJ(MAX) 125°C, package thermal resistance, 120°C/W. Worst case conditions calculated maximum operating temperature where 85°C. Typical conditions calculated under normal ambient conditions where 25°C. 85°C, PD(MAX) 333mW. 25°C, PD(MAX) 833mW. Maximum current given following equation: IOUT(MAX) (PD(MAX) Rds)1/2 AAT4651 85°C, IOUT(MAX) 1.65A, value greater than internal minimumcurrent limit specification.
AAT4651
Output Capacitor
0.1µF greater capacitor generally required between GND. Likewise, with output capacitor, there specific capacitor requirement. desired, COUT increased accommodate load transient condition.
Parallel Interface Break Before Make
parallel interface determines state output. logic levels compatible with CMOS logic. logic value must less than volts, logic high value must greater than volts. cases where interface pins rapidly change state directly from vice versa), internal break before make circuitry prevents back flow current from input power supply other. addition, body connections internal P-channel MOSFET switches always highest potential Vcc3, Vcc5, Vcc, which prevents body diode conduction, power supply backflow, possible device damage.
FAULT Output
FAULT output pulled ground open drain N-channel MOSFET during over current output slew condition. should pulled reference power supply controller nominal 100K resistor.
Voltage Regulation
Card Specification calls regulated volt supply tolerance +/-5%. this, typical power supply will drop less than traces will drop another This leaves AAT4651 card switch. card application, maximum allowable current
Overcurrent Overtemperature Protection
Because many AAT4651 applications provide power external devices, designed protect host device from malfunctions those peripherals
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5V/3V Card Power Switch
through slew rate control, current limiting, thermal limiting. AAT4651 current limit thermal limit serve immediate reliable electronic fuse without increase this function. Other solutions such poly fuse protect host power supply system from mishandling, short circuited peripherals, they will only prevent fire. AAT4651 high speed current limit thermal limit only prevent fires, they also isolate power supply entire system from activity external port, report mishap means FAULT signal. Overcurrent overtemperature hand hand. Once overcurrent condition exists, current supplied load AAT4651 limited overcurrent threshold. This results voltage drop across AAT4651 which causes excess power dissipation package temperature increase. begins heat overtemperature circuit activated. temperature reaches maximum level, AAT4651 automatically switches P-channel MOSFETs. While they off, overtemperature circuit remains active. Once temperature cooled approximately 10°C, P-channel MOSFETs switched back this manner, AAT4651 thermally cycled until short circuit removed. Once short removed, normal operation automatically resumes. save power, full high speed overcurrent circuit activated until lower threshold current (approximately 500mA) exceeded power device. When load current exceeds this crude threshold, AAT4651 quiescent current increases from 15µA 200µA. high speed overcurrent circuit works linearly limiting current when current limit reached. voltage begins drop current limiting, current limit magnitude varies, generally decreases voltage drops volts.
AAT4651
Switching Voltage
AAT4651 meets card standards switching output providing ground path well "off" state. card protocol determining voltage operations first power peripheral with volts poll volt operation. When transitioning from volts volts, must discharged less than volts provide hard reset. resistive ground state (VCCD0=VCCD1) will accommodate this. ground state will also guarantee voltage discharged within specified 100ms amount time.
Printed Circuit Board Layout Recommendations
proper thermal management, minimize trace resistance, take advantage RDS(ON) AAT4651, circuit board layout rules should followed: Vcc3, Vcc5, should routed using wider than normal traces, pins should connected same wide trace, should connected ground plane. best performance, COUT should placed close package pins.
Typical Card Application Circuit
Power Supply 3.3V
CIN5
100K
Card Controller
CIN3
VCC5 VCC3 VCCD1 VCCD0 FAULT
AAT4651
Card Slot
COUT 0.1µF
FAULT VCC_EN1 VCC_EN0
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5V/3V Card Power Switch Evaluation Board Layout
AAT4651 evaluation layout follows printed circuit board layout recommendations, used good applications layout. Note: Board layout shown scale.
AAT4651
Figure Evaluation board side silk screen layout assembly drawing
Figure Evaluation board component side layout
Figure Evaluation board solder side layout
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5V/3V Card Power Switch Ordering Information
Package SOP-8 TSSOP-8 Marking 4651 4651 Part Number (Tape Reel) AAT4651IAS-T1 AAT4651IHS-T1
AAT4651
Note: Sample stock generally held part numbers listed BOLD.
Package Information
SOP-8
3.90 0.10 4.90 0.10
6.00 0.20
0.375 0.125 1.55 0.20
0.175 0.075
0.235 0.045 0.825 0.445
0.42 0.09
1.27
dimensions millimeters.
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5V/3V Card Power Switch
TSSOP-8
AAT4651
4.40 0.10
6.40 0.20
3.00 0.10 0.65
1.05
1.20
0.145 0.055
0.245 0.055
0.10 0.05
0.60 0.15 1.00
DETAIL
dimensions millimeters.
AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. AnalogicTech warrants performance semiconductor products specifications applicable time sale accordance with AnalogicTech's standard warranty. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed.
Advanced Analogic Technologies, Inc.
Arques Avenue, Sunnyvale, 94085 Phone (408) 737-4600 (408) 737-4611
4651.2004.04.1.0

AAT4651 SmartSwitchis single channel Card (PCMCIA) power switch. used

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