AAT4625 SmartSwitch part AnalogicTech's Application Specific Power MOS

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AAT4625 SmartSwitch part AnalogicTech's Application Specific Power MOS

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Single-Channel Power Switch General Description
AAT4625 SmartSwitch part AnalogicTech's Application Specific Power MOSFET(ASPMTM) product family. 1.0A current limited P-channel MOSFET power switch designed high-side load-switching applications. This switch operates with inputs ranging from 2.7V 5.5V, making ideal both systems. integrated current-limiting circuit protects input supply against large changes load current which cause supply fall regulation. AAT4625 also protected from thermal overload which limits power dissipation junction temperatures. current limit threshold factory programmed 1.5A, with maximum 2.0A. quiescent supply current typically 16µA. shutdown mode, supply current decreases less than 1µA. AAT4625 available Pb-free, 8-pin SOP, TSSOP, MSOP packages, specified over -40°C +85°C temperature range. AAT4600 series family adjustable fixed SmartSwitch products with range current handling capabilities. Single versions with adjustable current limit (AAT4601) fixed current limit (AAT4625) well dual versions with fixed current limit (AAT4626) available.
AAT4625
SmartSwitch
Compliant with Specifications 2.7V 5.5V Input Voltage Range 1.0A Minimum Continuous Current 2.0A Maximum Current Limit Typical RDS(ON) Quiescent Current: Typically 16µA Maximum with Switch Thermal Shutdown Slew Rate Limited Turn Fault Flag with 10ms Blanking Under-Voltage Lockout (UVLO) Temperature Range: -40°C +85°C Approved-File E217765 8-Pin SOP, TSSOP, MSOP Package
Applications
General Purpose Power Switching Swap Supplies Notebook Computers Ports Peripherals
Recognized Component
Typical Application
5.0V 100k
OUTPUT
AAT4625
(EN)
0.1F
(EN)
120F
4625.2006.04.1.2
Single-Channel Power Switch Descriptions
AAT4625
Symbol
(EN)
Function
Enable input: logic-compatible enable input. High input 2.1V typical. input 1.9V typical. Active high active option available; Ordering Information details. Fault flag output: active-low, open-drain output. Indicates over-current, UVLO, thermal shutdown. Ground. internally connected. Switch output: These pins P-channel MOSFET drain connection. Supply input: This P-channel MOSFET source connection. Also supplies IC's internal circuitry.
Configuration
SOP-8 TSSOP-8 MSOP-8 (Top View)
(EN)
4625.2006.04.1.2
Single-Channel Power Switch Absolute Maximum Ratings1
25°C, unless otherwise noted. Symbol
VFLG IFLG VOUT IOUT TLEAD
AAT4625
Description
Current Output Current (Internally Limited) Storage Temperature Maximum Soldering Temperature Leads)
Value
-0.3 -0.3 -0.3 -0.3
Units
Thermal Information2
Symbol
Description
Maximum Thermal Resistance SOP-8 TSSOP-8 MSOP-8 SOP-8 TSSOP-8 MSOP-8
Value
Units
°C/W
Maximum Power Dissipation
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. Mounted printed circuit board. 4625.2006.04.1.2
Single-Channel Power Switch Electrical Characteristics
-40°C +85°C, unless otherwise noted. Typical values 25°C; bold values designate full temperature range. Symbol
IQ(OFF) VEN-THRSH RDS(ON) TON-RISE TOFF TOFF-FALL ISD(OFF) ILIMIT OTMP RFLG ISINK VUVLO TBLANK
AAT4625
Description
Operation Voltage Quiescent Current Supply Current Enable Input Threshold Enable Input Current Enable Input Capacitance On-Resistance Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Output Leakage Current Current Limit Threshold Over-Temperature Shutdown Error Flag Output Resistance Error Flag Current Under-Voltage Lockout FAULT Blanking
Conditions
Active 5.5V, (EN) Inactive Low-to-High Transition High-to-Low Transition 5.5V 25°C 3.0V, 25°C Inactive, 5.5V, VOUT Ramped Load Applied Enable Output, VOUT 4.0V Increasing Decreasing VFLG 5.5V Increasing, Hysteresis
Units
0.01 0.25 0.03 0.05
4625.2006.04.1.2
Single-Channel Power Switch Typical Characteristics
25°C, unless otherwise noted.
Quiescent Current Temperature
Quiescent Current
AAT4625
Quiescent Current
Input Current
Temperature (°C)
Input Voltage
Current Limit
Off-Supply Current Temperature
1.0000
Output Current
Off-Supply Current
0.1000
0.0100
0.0010
Output Voltage
Temperature (°C)
Off-Switch Current Temperature
1.0000
Turn On/Off Response with Load
5V/div FAULT 5V/div VOUT 2V/div 200mA/div Time (100s/div)
Off-Switch Current
0.1000 0.0100 0.0010 0.0001 0.0000
Temperature (°C)
4625.2006.04.1.2
Single-Channel Power Switch Typical Characteristics
25°C, unless otherwise noted.
Start Into Load
5V/div FAULT 5V/div VOUT 1V/div 500mA/div
AAT4625
Thermal Shutdown Response
5V/div FAULT 5V/div VOUT 1V/div 500mA/div
Time (1ms/div)
Time (50ms/div)
Short-Circuit Through
Input Output Voltage
Short-Circuit Through
Input Output Voltage
Output Current
Output Current
Inpu Voltage Current Voltage
Input Voltage Output Current Output Voltage
Time
Time
RDS(ON) Temperature
80.0 75.0
RDS(ON)
70.0 65.0 60.0 55.0 50.0 45.0 40.0
Temperature (°C)
4625.2006.04.1.2
Single-Channel Power Switch Functional Block Diagram
AAT4625
Over-Temperature Protection
Undervoltage Lockout
(EN)
1.2V Reference Current Limit
Functional Description
AAT4625 integrated MOSFET load switch with fixed current limit, over-temperature protection, level shifted input, fault flag. current limit control combined with overtemperature thermal limit circuit provide comprehensive system protect load switch under short-circuit other adverse operating conditions. AAT4625 ideally suited control protection peripheral ports such USB, RS232, parallel ports. current limit over-temperature circuits will independently. device current limit activated when output load current exceeds preset internal threshold level. minimum current limit threshold characteristic specified ILIM(MIN). load switch ambient temperature becomes excessive short-circuit condition persists, temperature will rise, causing over-temperature protection circuit activate.
current limit over-temperature protection circuits active more than milliseconds, system will informed FAULT flag. 10ms fault blanking delay allows AAT4625 turned into large capacitive loads without activating FAULT flag. open drain FAULT output connected directly system controllers driven voltage levels less than voltage without additional level shifting circuitry. load switch turned applying logic level signal pin. AAT4625 enable function available both active high active logic level versions. AAT4625 typically consumes 16µA when operating; when off, device draws less than 1µA. state, current prevented from flowing between input output. function logic level thresholds that allow AAT4625 compatible also controlled 2.5V 5.0V CMOS circuits. voltage level either FAULT should exceed input supply level present pin.
4625.2006.04.1.2
Single-Channel Power Switch Applications Information
Operation Current Limit
excessive load applied output AAT4625, load current will limited device's current limit circuitry. Refer "Current Limit" curve Typical Characteristics section this datasheet. short circuit were occur load, there would demand more current than what allowed internal current limiting circuit voltage device output will drop. This causes AAT4625 dissipate more power than normal operation, causing temperature increase. When temperature exceeds internal over-temperature threshold, AAT4625 will shut down. After shutting down, AAT4625 cools level below over-temperature threshold, which point will start again. AAT4625 will continue cycle until following events occurs: load current reduced level below AAT4625's current limit setting; input power removed; output turned logic high level applied pin. circuit board assembly under AAT4625 when load switch dissipating power. Equation transformed provide IMAX; Refer Equation
AAT4625
IMAX
TSD(MIN) TA(MAX) RDS(ON)(MAX)
TSD(MIN) minimum temperature required activate device over-temperature protection. typical thermal limit temperature specification 125°C AAT4625; calculations, 115°C safe minimum value use. example, portable device specified operate 50°C environment. printed circuit board assembly will operate temperatures high 85°C. This portable device sealed case area printed board assembly relatively small, causing approximately 120°C/W. Using Equation
Thermal Considerations
Since AAT4625 internal current limit over-temperature protection, junction temperature rarely concern. application requires large load current high-temperature operating environment, there possibility that overtemperature protection circuit (rather than current limit circuit) will regulate current available load. these applications, maximum current available without risk activation over-temperature circuit calculated. maximum internal temperature while current limit active calculated using Equation TJ(MAX) IMAX2 RDS(ON)(MAX) TA(MAX)
IMAX
1.4A
this system requires less than 1.4A, thermal limit will activate during normal operation.
Input Capacitor
input capacitor serves purposes. First, protects source power supply from transient current effects generated application load circuit. short circuit suddenly applied output AAT4625, there microsecond long period during which large current flow before current limit circuit becomes active. Refer characteristic curve "Short Circuit Through 0.3." properly sized input capacitor dramatically reduce load switch input transient response effects seen power supply other circuitry upstream from AAT4625. second purpose input capacitor prevent transient events generated load circuit from affecting operation AAT4625. example, AAT4625 used circuit that operates from power supply with poor step load response, turning load switch could cause
4625.2006.04.1.2
Equation IMAX maximum current required load. RDS(ON)(MAX) maximum rated RDS(ON) AAT4625 high temperature. thermal resistance between device board onto which mounted. TA(MAX) maximum ambient temperature print8
Single-Channel Power Switch
input power supply drop below AAT4625's under-voltage lockout threshold. This drop voltage would cause AAT4625 turn until input power supply voltage level recovers. Since this cycle would self-perpetuating, entire circuit could seen unstable. very rare case where capacitor cost prohibitive input capacitor omitted, output load circuit should slew rate limited when turned datasheet. When AAT4625 state, output open circuit device quiescent current consumption reduced less than 1µA. threshold voltage allow AAT4625 controlled levels, well CMOS-compatible levels ranging from 2.5V function control voltage level should exceed input supply level applied pin.
AAT4625
Output Capacitor
order insure stability while device current limit active, small capacitance approximately should used. When AAT4625 activated using function, there momentary current transients, case when short circuit suddenly applied device that already Refer "Turn-On/Off Response" characteristics curve. Regardless output capacitor size, output current limited value allowed threshold determined internal current limiting circuitry. Refer internal current limit threshold specifications stated Electrical Characteristics section this datasheet. This permits very large output capacitors used. example, ports specified have least 120µF downstream capacitance from their controlling power switch. output capacitance large 1000µF would disturb input power supply AAT4625 used control port.
Fault Flag Output
AAT4625 features active fault flag output. fault flag provided alert system over-current over-temperature circuits become active load switch receiving sufficient voltage level properly operate. either current limit over-temperature circuits combination constantly active more than approximately 10ms, FAULT pulled ground internally through open drain device. 10ms delay FAULT function intended prevent capacitive loads connected load switch output from activating FAULT flag when device turned placement pull-up resistor between FAULT recommended. Reasonable values pull-up resistor should range from 100k. Since FAULT flag open drain terminal, pulled voltage that greater than level present pin. This done allow AAT4625 signal ancillary circuitry that powered voltage levels less than level pin. fault flag delay greater than 10ms required, addition delay added filter. filter added fault flag output, shown Figure
100k 0.1F
Input
AAT4625 available both active high active enable versions. specific part numbers, refer Ordering Information section this
Controller Over-Current Flag Input
AAT4625
Figure Fault Flag Delay Filter.
4625.2006.04.1.2
Single-Channel Power Switch
Reverse Voltage
AAT4625 designed control current flowing from OUT. voltage applied which greater than that large reverse current flow, potentially damaging device.
AAT4625
Hot-Plug Applications
Application circuit cards with high inrush current potential limited AAT4625. AAT4625 both slew rate limited turn-on characteristics current limit controlled output which make ideally suited power port hot-plug applications. host power back plane hot-plug receptacle sensitive short duration, high power surges. AAT4625 will turn linear ramping fashion regulate inrush current within specified current limit device. error flag usually will affected during application turn-on, since 10ms flag blanking time intended these types events. application turn-on current surge exceeds 10ms, delay filter added flag output prevent system from receiving error during start-up sequence (see Figure
Under-Voltage Lockout
AAT4625 been designed with under-voltage lockout control circuit. under-voltage lockout prevents output MOSFET device from turning until exceeds typical UVLO threshold 2.3V. During operation, device will automatically shut down falls below UVLO threshold fault flag will toggled.
Cable Connector Hot-Plug Port Hot-Plug Receptacle
AAT4625
0.1F CBULK (120F)
Card Application Circuit
Inrush Current Protected Application Card
Figure AAT4625 Inrush Current Protected Application.
Layout Information
order obtain maximum performance from AAT4625, very careful consideration must given printed circuit board layout. most port power switch port protection applications, high
voltage current transient events will occur. Proper layout help reduce effects transient events. trace resistance will affect overall circuit transient response; addition, small voltage drops will incurred.
4625.2006.04.1.2
Single-Channel Power Switch
Refer following guidelines power port layout: traces should kept short direct possible minimize effects circuit performance. Make component solder pads large minimize contact resistance. AAT4625 output bulk capacitor ferrite beads should placed close device possible. traces output connector should kept short possible minimized trace resistance associated voltage drop (I2R loss). ferrite beads used circuit, select ferrite beads with minimum series resistance. trace vias should avoided traces that conduct high currents. vias necessary, make vias large possible multiple vias connected parallel minimize their effect.
AAT4625
Trace Resistance 0.01 (5mV)
P-Channel MOSFET Switch Resistance 0.06 (30mV)
Ferrite Bead Trace Resistance 0.02 (10mV)
Cable, Connector, Contact Resistance 0.03 (15mV)
Input Power Supply 4.50V 5.25V
(5mV) (10mV) (15mV)
VBUS CBULK 0.1F AAT4625 CBULK 0.1F
Downstream Peripheral Port 500mA Max. Load Current
Total Voltage Drop 60mV
Figure Summary Typical Circuit Voltage Drops Caused AAT4625 Circuit Components Trace Resistance.
Evaluation Board Layout
AAT4625 evaluation layout (shown Figures follows recommend printed circuit board layout procedures used
example good application layouts. Note that ferrite beads used this simple device evaluation board. board layout shown scale.
Figure Evaluation Board Component Side Layout.
Figure Evaluation Board Solder Side Layout.
Figure Evaluation Board Side Silk Screen Layout/ Assembly Drawing.
4625.2006.04.1.2
Single-Channel Power Switch
Application Circuits
Ferrite Beads
AAT4625
VBUS 5.0V 0.1F 100k
VBUS COUT1 0.1F COUT2 120F DGND
AAT4625
EN(EN)
Controller Error Flag On/Off
DATA
Figure Typical Host Port Application.
5.0V 4.50V 5.25V Upstream 100mA Maximum VBUS DGND 100k AAT3220-3.3
3.3V Controller
ON/OFF Over-Current Flag
AAT4625
Ferrite Beads
Port VBUS
120F
0.1F DGND
Data
Data
Figure Self-Powered Single Port Hub.
100k Host VBUS DGND AAT3220-3.3
3.3V Controller
ON/OFF Over-Current Flag
AAT4625
Ferrite Beads
Port VBUS
120F
0.01F DGND
Data
Data
Figure Powered Single Port Hub.
4625.2006.04.1.2
Single-Channel Power Switch Ordering Information
Package
SOP-8 SOP-8 TSSOP-8 TSSOP-8 MSOP-8 MSOP-8
AAT4625
Enable
(Active-high) (Active-low) (Active-high) (Active-low) (Active-high) (Active-low)
Marking1
4625-1 4625 4625-1 4625 DDXYY DCXYY
Part Number (Tape Reel)2
AAT4625IAS-1-T1 AAT4625IAS-T1 AAT4625IHS-1-T1 AAT4625IHS-T1 AAT4625IKS-1-T1 AAT4625IKS-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.
assembly date code. Sample stock generally held part numbers listed BOLD. 4625.2006.04.1.2
Single-Channel Power Switch
TSSOP-8
AAT4625
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.
4625.2006.04.1.2
Single-Channel Power Switch
MSOP-8
1.95
AAT4625
3.00 0.10
4.90 0.10
0.60 0.20 0.254
0.95
3.00 0.10
0.95 0.15 0.85 0.10
0.075 0.075 0.65 0.30 0.08
dimensions millimeters.
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
4625.2006.04.1.2
GAUGE PLANE
0.155 0.075

AAT4625 SmartSwitch part AnalogicTech's Application Specific Power MOS

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