AAT4651 SmartSwitch single channel card (PCMCIA) power switch. used se
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5V/3V Card Power Switch General Description
AAT4651 SmartSwitch 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 2-bit parallel interface, three states VCC5, VCC3, ground. When ground state, pulled ground resistor. open drain FAULT output asserted during over-current conditions. During power-up 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 Pb-free, 8-pin TSSOP package specified over -40°C +85°C temperature range.
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 Temperature Range: -40°C +85°C 8-Pin 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 0.1F
4651.2006.05.1.2
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). supply.
Configuration
SOP-8 (Top View) TSSOP-8 (Top View)
VCCD1 VCCD0 FAULT
VCC5 VCC3
VCCD1 VCCD0 FAULT
VCC5 VCC3
Control Logic Table
VCCD1
VCCD0
Function
3.3V
Result
VCC3 VCC5
4651.2006.05.1.2
5V/3V Card Power Switch Absolute Maximum Ratings1
25°C, unless otherwise noted. Symbol
VCC3, VCC5 IMAX VESD
AAT4651
Description
Maximum Continuous Switch Current Operating Junction Temperature Range Rating2
Value
-0.3 -0.3 Current Limited 4000
Units
Thermal Characteristics3
Symbol
Description
Thermal Resistance Power Dissipation SOP-8 TSSOP-8 SOP-8 TSSOP-8
Value
Units
°C/W
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. Human body model 100pF capacitor discharged through 1.5k resistor into each pin. Mounted board. 4651.2006.05.1.2
5V/3V Card Power Switch Electrical Characteristics
VCC5 5.0V, VCC3 3.3V, -40°C +85°C, unless otherwise noted. Typical values 25°C; bold values designate full temperature range. Symbol
Output Iccsc RDS(ON) RCLAMP Tcrds Short-Circuit Current Limit Resistance Clamp Resistance VCCIN -0.5V, Mode VCC3 VCC5 Selected, 25°C 3.0V, 25°C 5.0V, 25°C Clamped GND, ICCOUT 10mA Sinking 2800 3.3V, ROUT 5.0V, ROUT 3.3V, RLOAD 5.0V, RLOAD 3.3V 3.3V, RLOAD 5.0V 5.0V, RLOAD 3.3V, RLOAD 5.0V, RLOAD 1000 1000 2000 1500 3000 3000 0.01 0.05 ppm/°C
AAT4651
Description
Conditions
Units
Switch Resistance Temperature Coefficient 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 Power Supply VCC3 VCC3 Operation Voltage VCC5 VCC5 Operation Voltage ICC3 VCC3 Supply Current
Off, VCC3 VCC5, 3.3V, VCC3 VCC5, Off, VCC5 VCC3, 3.3V, VCC5 VCC3, VCC5 VCC3, VCC3 VCC5 3.0V 5.5V1 VCC3 VCC5 2.7V 3.6V VCC3 VCC5 4.5V 5.5V VCTL 5.5V ISINK VFAULT 5.5V
ICC5
VCC5 Supply Current
Parallel Interface VCCD VCCD Input Voltage VCCD Input High Voltage VCCD ISINK VCCD VFAULTLOW ISINKFAULT Other OTMP VCCD Input leakage FAULT Logic Output Voltage FAULT Logic Output High Leakage Current Over-Temperature Shutdown
VCCD outside this range, consult Typical VCCD Threshold curve.
4651.2006.05.1.2
5V/3V Card Power Switch Typical Characteristics
Unless otherwise noted, 25°C.
Quiescent Current Temperature
(ICC5)
AAT4651
Current Limit
(VCC VCC3)
Quiescent Current
VCC3 VCCD1 VCC5 VCCD0
Temperature (°C)
Output Voltage
Current Limit
(VCC VCC5)
Off-Switch Current Temperature
(ICC3)
Off-Switch Current
1.0000
VCC3 VCCD1
0.1000 0.0100 0.0010 0.0001 0.0000
VCC5 VCCD0
Output Voltage
Temperature (°C)
Off-Switch Current Temperature
(ICC5)
RDS(ON) Temperature
120.0
Off-Switch Current
1.0000 0.1000 0.0100 0.0010 0.0001 0.0000
VCC5 VCC3
RDS(ON)
VCCD1 VCCD0
110.0 100.0 90.0 80.0 70.0 60.0
VCC3 3.0V
VCC5 5.0V
Temperature (°C)
Temperature (°C)
4651.2006.05.1.2
5V/3V Card Power Switch Typical Characteristics
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 (500mA/div)
(1V/div)
IVCC5 (200mA/div)
Time (500µs/div)
Time (500µs/div)
Thermal Shutdown Response
(VCCD0 VCCD1 (5V/div)
Input Output
Short Circuit Through
FAULT (5V/div)
Input Voltage
Output
(1V/div)
Output Current Output Voltage
IVCC5 (500mA/div)
Time (100ms/div)
Time
Short Circuit Through
VCCD Threshold
VCCD Threshold Voltage
Input Output
Input Voltage Output Current Output Voltage
Output
VCCDH VCCDL
Time
4651.2006.05.1.2
5V/3V Card Power Switch Functional Block Diagram
VCC3 VCC5
AAT4651
Body Control
OverCurrent
OverCurrent
OverTemperature
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 power supply, applications where power switched, example, between operation 3.3V standby mode. AAT4651 operates with input voltages ranging from 2.7V 5.5V combination automatically powers internal circuitry from whichever input voltage higher. identical RDS(ON) P-channel MOSFETs serve power multiplexing circuit with common drain output independent sources VCC3 VCC5 inputs. 2-bit parallel interface determines state multiplexer: VCC3, 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 powerup 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.
4651.2006.05.1.2
5V/3V Card Power Switch Applications Information
Input Capacitor
larger capacitor typically recommended CIN. capacitor required basic operation; however, useful preventing load transients from affecting upstream circuits. should located close device practically possible. Ceramic, tantalum, aluminum electrolytic capacitors selected CIN. There specific capacitor equivalent series resistance (ESR) 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
Voltage Regulation
card specification calls regulated 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 AAT4651 dominated voltage regulation rather than thermal considerations, either current limit maximum RDS(ON) Pchannel MOSFET. maximum RDS(ON) 85°C calculated applying RDS(ON) temperature coefficient maximum room temperature RDS(ON):
RDS(ON)(MAX) RDS(ON)25
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.
-or-
RDS(ON)(MAX) 100m [0.0028 60]) 116.8m
Parallel Interface Break Before Make
2-bit parallel interface determines state output. logic levels compatible with CMOS logic. logic value must less than 0.8V, logic high value must greater than 2.4V. cases where interface pins rapidly change state directly from vice versa), internal break-before-make circuitry prevents backflow 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.
maximum current equal tolerance supply (100mV) across AAT4651 divided RDS(ON)(MAX).
IMAX5
100mV 856.2mA 116.8m
3.3V supply card application, conditions relaxed, with allowable voltage regulation drop equal 300mV. With supply trace regulation, card switch have 200mV drop.
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.
IMAX3
200mV 1.5A 134m
Since 1.5A nominal current limit value, AAT4651 will current limit before IMAX3 reached. Thermal issues problem SOP-8 package since package thermal resistance, only 120°C/W. given ambient temperature
4651.2006.05.1.2
5V/3V Card Power Switch
(TA), maximum package power dissipation determined following equation:
TJ(MAX)
AAT4651
PD(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:
dissipation package temperature increase. begins heat over-temperature circuit activated. temperature reaches maximum level, AAT4651 automatically switches P-channel MOSFETs. While they off, over-temperature 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 over-current 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 over-current circuit works linearly limiting current when current limit reached. voltage begins drop current limiting, current limit magnitude varies generally decreases voltage drops
IOUT(MAX)
PD(MAX) RDS(ON)
AAT4651 85°C, IOUT(MAX) 1.65A, value greater than internal minimum current limit specification.
Switching Voltage
AAT4651 meets card standards switching output providing ground path well "off" state. card protocol determining voltage operations first power peripheral with poll 3.3V operation. When transitioning from 3.3V, must discharged less than 0.8V provide hard reset. resistive ground state (VCCD0 VCCD1) will accommodate this. ground state will also guarantee voltage discharged within specified 100ms amount time.
Over-Current Over-Temperature Protection
Because many AAT4651 applications provide power external devices, designed protect host device from malfunctions those peripherals through slew rate control, current limiting, thermal limiting. AAT4651 current limit thermal limit serve immediate reliable electronic fuse without increase RDS(ON) this function. Other solutions, such poly fuse, protect host power supply system from mishandling short circuiting 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. Over-current over-temperature hand hand. Once over-current condition exists, current supplied load AAT4651 limited over-current threshold. This results voltage drop across AAT4651 which causes excess power
4651.2006.05.1.2
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 (Pins should connected same wide trace; should connected ground plane. best performance, COUT should placed close package pins.
5V/3V Card Power Switch Timing Diagram
AAT4651
VCCD0,1
Figure Switching Time Diagram.
Refer Switching Time specifications Electrical Characteristics section this datasheet definitions
Typical Card Application Circuit
Power Supply 3.3V
CIN5
100k
Card Controller
CIN3
VCC5 VCC3 VCCD1 VCCD0 FAULT
AAT4651
Card Slot
COUT 0.1F
FAULT VCC_EN1 VCC_EN0
4651.2006.05.1.2
5V/3V Card Power Switch Evaluation Board Layout
AAT4651 evaluation board 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.
4651.2006.05.1.2
5V/3V Card Power Switch Ordering Information
Package
SOP-8 TSSOP-8
AAT4651
Marking
4651 4651
Part Number (Tape Reel)1
AAT4651IAS-T1 AAT4651IHS-T1
AnalogicTech products offered Pb-free packaging. term "Pb-free" means semiconductor products that compliance with current RoHS standards, including requirement that lead exceed 0.1% weight homogeneous materials. more information, please visit website
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.
Sample stock generally held part numbers listed BOLD.
4651.2006.05.1.2
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.
4651.2006.05.1.2
5V/3V Card Power Switch
AAT4651
Advanced Analogic Technologies, Inc. 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. Customers advised 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. AnalogicTech AnalogicTech logo trademarks Advanced Analogic Technologies Incorporated. other brand product names appearing this document registered trademarks trademarks their respective holders.
Advanced Analogic Technologies, Inc.
Arques Avenue, Sunnyvale, 94085 Phone (408) 737-4600 (408) 737-4611
4651.2006.05.1.2
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