80m, 500mA High-Side Power Switch with Flag RT9706 cost-effective

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80m, 500mA High-Side Power Switch with Flag RT9706 cost-effective

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RT9706
80m, 500mA High-Side Power Switch with Flag
RT9706 cost-effective, voltage, single N-Channel MOSFET high-side power switch, optimized self-powered bus-powered Universal Serial (USB) applications. RT9706 equipped with charge pump circuitry drive internal MOSFET switch; switch's RDS(ON) 80m, meets voltage drop requirements; flag output available indicate fault conditions local controller. Additional features include soft-start limit inrush current during plug-in, thermal shutdown prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) ensure that device remains unless there valid input voltage present, lower quiescent current making this device ideal portable battery operated equipment. RT9706 available SOT-23-5 package requiring minimum board space smallest components.
Features
Compliant Specifications Built-In (Typically 80m) N-Channel MOSFET Output Forced Higher than Input (Off-State) Supply Current Typical Switch State 0.1A Typical Switch State Guaranteed 500mA Continuous Load Current Wide Input Voltage Ranges 5.5V Open-Drain Fault Flag Output Plug-In Application (Soft-Start) 1.7V Typical Under-Voltage Lockout (UVLO) Current Limiting Protection Thermal Shutdown Protection Reverse Current Flow Blocking body diode) Smallest SOT-23-5 Package Minimizes Board Space Approved-E219878 RoHS Compliant 100% Lead (Pb)-Free
Ordering Information
RT9706 Package Type SOT-23-5 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Applications
Bus/Self Powered Hubs Peripherals ACPI Power Distribution Card Swap Notebook, Motherboard Battery-Powered Equipment Hot-Plug Power Supplies Battery-Charger Circuits
Note RichTek Pb-free Gree products RoHS compliant compatible with current requirements IPC/JEDEC J-STD-020. Suitable SnPb Pb-free soldering processes. 100% matte (Sn) plating.
Configurations
(TOP VIEW)
VOUT
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
SOT-23-5
DS9706-02 March 2007
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RT9706
Typical Application Circuit
Pull-Up Resistor (10K 100k) Controller Supply Voltage RT9706 VOUT 10uF 150uF VBUS DGND Ferrite Beades Over -Current
Note: low-ESR 150F aluminum electrolytic tantalum between VOUT strongly recommended meet 330mV maximum droop requirement VBUS. (see Application Information Section further details)
Data
Functional Description
Name VOUT Function Power Input Voltage Output Voltage Ground Chip Enable (Active Low) Open-Drain Fault Flag Output
Function Block Diagram
Bias UVLO Current Limiting Gate Control Output Voltage Detection
Oscillator
Charge Pump
Thermal Protection
VOUT
Delay
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DS9706-02 March 2007
RT9706
Test Circuits
ISupply VFLG ILEAK
VFLG IOUT VOUT
RT9706 VOUT
RT9706 VOUT
COUT
VRDS(ON)
IOUT
VOUT
VFLG VOUT
RT9706
COUT
RT9706 VOUT COUT
VFLG IOUT VOUT
RT9706 VOUT COUT
Note: Above test circuits reflected graphs shown Typical Operating Characteristics follows -Turn-On Rising Falling Time Temperature, Turn-On Response, Flag Response Temperature -On-Resistance Input Voltage Temperature Threshold Voltage Input Voltage Temperature, Flag Delay Time Input Voltage Temperature, UVLO Threshold Temperature, UVLO Rising Falling -Current Limit Input Voltage/Temperature, Short Circuit Current Response, Short Circuit Current Temperature, Inrush Current Response, Soft-start Response, Ramped Load Response, Current Limit Transient Response, Thermal Shutdown Response DS9706-02 March 2007 www.richtek.com -Supply Current Input Voltage Temperature, Switch Supply Current Temperature, Turn-Off Leakage Current
RT9706
Absolute Maximum Ratings
(Note Supply Voltage 6.5V Chip Enable Input Voltage -0.3V 6.5V Flag Voltage 6.5V Power Dissipation, 25°C SOT-23-5 0.4W Package Thermal Resistance (Note SOT-23-5, 250°C/W Junction Temperature 150°C Lead Temperature (Soldering, sec.) 260°C Storage Temperature Range -65°C 150°C Susceptibility (Note (Human Body Mode) (Machine Mode) 200V
Recommended Operating Conditions
(Note
Supply Input Voltage 5.5V Chip Enable Input Voltage 5.5V Junction Temperature Range -40°C 125°C Ambient Temperature Range -40°C 85°C
Electrical Characteristics
(VIN COUT 25°C, unless otherwise specified)
Parameter Switch Resistance Supply Current Logic-Low Voltage Threshold Input Current Output Leakage Current Output Turn-On Rise Time Current Limit FLAG Output Resistance FLAG Current FLAG Delay Time (Note Under-voltage Lockout Under-voltage Hysteresis
Symbol RDS(ON) ISW_ON ISW_OFF
Test Conditions IOUT 500mA switch VOUT Open switch off, VOUT Open 5.5V, switch 5.5V, switch 5.5V
-2.0 -0.5
-0.01 0.01
-1.25
Units
Logic-High Voltage
ILEAKAGE RLOAD TON_RISE VOUT rising ILIM RFLG IFLG_OFF VUVLO VUVLO RLOAD ISINK VFLG From fault condition assertion Rising
continued
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RT9706
Parameter Thermal Shutdown Protection Thermal Shutdown Hysteresis Symbol Test Conditions -Typ -Units
Note Stresses listed above "Absolute Maximum Ratings" cause permanent damage device. These stress ratings. Functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods remain possibility affect device reliability. Note Devices sensitive. Handling precaution recommended. Note device guaranteed function outside operating conditions. Note measured natural convection 25°C effective single layer thermal conductivity test board JEDEC 51-3 thermal measurement standard. Note FLAG delay time input voltage dependent, see" Typical Operating Characteristics" graph further details.
DS9706-02 March 2007
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RT9706
Typical Operating Characteristics
Supply Current Temperature
Supply Current Input Voltage
Supply Current (uA)
Supply Current (uA)
Temperature (°C)
Input Voltage
Switch Resistance Temperature
0.14
Switch Resistance Input Voltage
Switch Resistance
Switch Resistance
0.12 0.08 0.06 0.04 0.02
Temperature (°C)
Input Voltage
Current Limit Temperature
1.25
Current Limit Input Voltage
Current Limit
Current Limit
0.75 0.25
Temperature (°C)
Input Voltage
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DS9706-02 March 2007
RT9706
Threshold Voltage Temperature
Threshold Voltage Input Voltage
Threshold Voltage
Threshold Voltage
Temperature (°C)
Input Voltage
Flag Delay Time Temperature
FLAG Delay Time Input Voltage
FLAG Delay Time (ms)
Flag Delay Time (ms)
Temperature (°C)
Input Voltage
Turn-Off Leakage Current Temperature
Switch Supply Current Temperature
Turn-Off Leakage Current (uA)
Switch Supply Current (uA)
-0.5
0.06
0.02
-0.02
-0.06
-0.1
Temperature (°C)
Temperature (°C)
DS9706-02 March 2007
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RT9706
Turn-On Rising Time Temperature
Turn-Off Falling Time Temperature
Turn-On Rising Time (us)
Turn Falling Time (us)
Temperature (°C)
Temperature (°C)
Turn-On Response
33uF, COUT
Turn-Off Response
33uF, COUT
(5V/Div)
(5V/Div)
VOUT (5V/Div)
VOUT (5V/Div)
Time (100s/Div)
Time (25s/Div)
UVLO Rising
33uF, COUT
UVLO Falling
33uF, COUT
(1V/Div) VOUT (1V/Div) Time (1ms/Div)
(1V/Div) VOUT (1V/Div) Time (10ms/Div)
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DS9706-02 March 2007
RT9706
Flag Response with Over Current
(5V/Div) FLAG (5V/Div) VOUT (5V/Div)
Flag Response with Turn-On Short Current
(5V/Div) FLAG (5V/Div)
IOUT (500mA/Div)
COUT
IOUT (500mA/Div) Time (10ms/Div)
Time (2.5ms/Div)
Short Circuit Current Response
Inrush Current Response
(5V/Div)
COUT 1000uF
COUT 220uF
IOUT (1A/Div)
COUT 33uF
IOUT (1A/Div)
COUT
Time (5ms/Div)
Time (1ms/Div)
Ramped Load Response
Ramped Load Response
VOUT (1V/Div)
(5V/Div) IOUT (1A/Div)
IOUT (500mA/Div)
RL(H) RL(L)
IOUT (500mA/Div)
Short
Time (50s/Div)
Time (50ms/Div)
DS9706-02 March 2007
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RT9706
Applications Information
RT9706 single N-Channel MOSFET high-side power switch with active-low enable input, optimized self-powered bus-powered Universal Serial (USB) applications. RT9706 equipped with charge pump circuitry drive internal NMOS switch; switch's RDS(ON), 80m, meets voltage drop requirements; flag output available indicate fault conditions local controller. Input Output (input) power source connection internal circuitry drain MOSFET. VOUT (output) source MOSFET. typical application, current flows through switch from VOUT toward load. VOUT greater than VIN, current will flow from VOUT since MOSFET bidirectional when Unlike normal MOSFET, there parasitic body diode between drain source MOSFET, RT9706 prevents reverse current flow VOUT being externally forced higher voltage than when output disabled (VEN 2V). Soft Start Plug-In Applications order eliminate upstream voltage droop caused large inrush current during hot-plug events, "soft-start" feature effectively isolates power source from extremely large capacitive loads, satisfying voltage droop requirements. Fault Flag RT9706 provides signal which N-Channel open drain MOSFET output. This open drain output goes when VOUT current limit temperature exceeds 130°C approximately. output capable sinking 10mA load typically 200mV above ground. requires pull-up resistor, this resistor should large value reduce energy drain. 100k pull-up resistor works well most applications. case over-current condition, will asserted only after flag response delay time, elapsed. This ensures that asserted only upon valid over-current conditions that erroneous error reporting eliminated. response delay time typically 12ms. example, false over-current conditions occur during hot-plug events when extremely large capacitive loads connected causes high transient inrush current that exceeds current limit threshold. Under-Voltage Lockout Under-voltage lockout (UVLO) prevents MOSFET switch from turning until input voltage exceeds approximately 1.7V. input voltage drops below approximately 1.3V, UVLO turns MOSFET switch, will asserted accordingly. Under-voltage detection functions only when switch enabled. Current Limiting Short-Circuit Protection current limit circuitry prevents damage MOSFET switch downstream port deliver load current current limit threshold typically 800mA through switch RT9706. When heavy load short circuit applied enabled switch, large transient current flow until current limit circuitry responds.
Normal MOSFET
Figure Chip Enable Input
RT9706
switch will disabled when logic high condition. During this condition, internal circuitry MOSFET turned off, reducing supply current 0.1A typical. maximum guaranteed voltage logic 0.8V. minimum guaranteed voltage will turn RT9706 off. Floating input cause unpredictable operation. should allowed negative with respect GND.
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DS9706-02 March 2007
RT9706
Once this current limit threshold exceeded device enters constant current mode until thermal shutdown occurs fault removed. Thermal Shutdown Thermal shutdown employed protect device from damage temperature exceeds approximately 130°C. enabled, switch automatically restarts when temperature falls 20°C. output signal will continue cycle until device disabled fault removed. Power Dissipation Thermal Consideration device junction temperature depends several factors such load, layout, ambient temperature package type. output RT9706 deliver current 500mA, respectively over full operating junction temperature range. However, maximum output current must derated higher ambient temperature ensure junction temperature does exceed 100°C. With possible conditions, junction temperature must within range specified under operating conditions. Power dissipation calculated based output current RDS(ON) switch below. RDS(ON) (IOUT)
maximum power dissipation 25°C calculated following formula D(MAX) (125°C 25°C) 250°C/W SOT-23-5 packages maximum power dissipation depends operating ambient temperature fixed J(MAX) thermal resistance RT9706 packages, Figure derating curves allows designer effect rising ambient temperature maximum power allowed.
Maximum Power Dissipation
Single Layer
SOT-23-5
Ambient Temperature (°C)
Although devices rated 500mA output current, application limit amount output current based total power dissipation ambient temperature. final operating junction temperature conditions estimated following thermal equation PD(MAX) TJ(MAX) PD(MAX) TJ(MAX) Where J(MAX) maximum operation junction temperature, ambient temperature junction ambient thermal resistance. recommended operating conditions specification RT9706, where J(MAX) maximum junction temperature (125°C) maximum ambient temperature. junction ambient thermal resistance layout dependent. SOT-23-5 packages, thermal resistance 250°C/W standard JEDEC 51-3 single-layer thermal test board.
DS9706-02 March 2007
Figure Derating Curves RT9706 Package Universal Serial (USB) Power Distribution goal enabled device from different vendors interoperate open architecture. features include ease user, wide range workloads applications, robustness, synergy with industry, low-cost implement- ation. Benefits include self-identifying peripherals, dynamically attachable reconfigurable peripherals, multiple connections (support concurrent operation many devices), support many physical devices, compatibility with Plug-and-Play architecture. Universal Serial connects devices with host: each system host. devices classified either hubs, which provide additional attachment points USB, functions, which provide capabilities system (for example, digital joystick). devices then classified either Bus-Power Hubs Self-Powered Hubs.
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RT9706
Bus-Powered draws power internal functions downstream ports from connector power pins. draw 500mA from upstream device. External ports Bus-Powered supply 100mA port, with maximum four external ports. Self-Powered power internal functions downstream ports does come from USB, although interface draw 100mA from upstream connect, allow interface function when remainder powered down. must able supply 500mA external downstream ports. Please refer Universal Serial Specification Revision more details designing compliant host systems. Over-Current protection devices such fuses resistors (also called polyfuse polyswitch) have slow trip times, high on-resistance, lack necessary circuitry USB-required fault reporting. faster trip time RT9706 power distribution allow designers design hubs that operate through faults. RT9706 have on-resistance internal faultreporting circuitry that help designer meet voltage regulation fault notification requirements. Because devices also power switches, designer self-powered hubs flexibility turn power output ports. Unlike normal MOSFET, devices have controlled rise fall times provide needed inrush current limiting required bus-powered power switch. Supply Filter/Bypass Capacitor low-ESR ceramic capacitor from GND, located device strongly recommended prevent input voltage drooping during hot-plug events. However, higher capacitor values will further reduce voltage droop input. Furthermore, without bypass capacitor, output short cause sufficient ringing input (from source lead inductance) destroy internal control circuitry. input transient must exceed 6.5V absolute maximum supply voltage even short duration. Output Filter Capacitor low-ESR 150F aluminum electrolytic tantalum between VOUT strongly recommended meet 330mV maximum droop requirement VBUS (Per 2.0, output ports must have minimum 120F low-ESR bulk capacitance hub). Standard bypass methods should used minimize inductance resistance between bypass capacitor downstream connector reduce decouple voltage droop caused when downstream cables hot-insertion transients. Ferrite beads series with VBUS, ground line 0.1F bypass capacitors power connector pins recommended protection. bypass capacitor itself should have dissipation factor allow decoupling higher frequencies. Fault Flag Filtering (Optional) transient inrush current downstream capacitance cause short-duration error flag, which cause erroneous over-current reporting. simple lowpass filter (10k 0.1F) flag line (see Typical Application Circuit) eliminates short-duration transients. Voltage Drop specification states minimum port-output voltage locations bus, 4.75V SelfPowered port 4.4V Bus-Powered port. with Self-Powered Hub, resistive voltage drops Bus-Powered must accounted guarantee voltage regulation (see Figure 7-47 Universal Serial Specification Revision following calculation determines VOUT (MIN) multiple ports (NPORTS) ganged together through switch using switch port, NPORTS equal VOUT (MIN) 4.75V
RCONN RCABLE VPCB
(0.1A NPORTS RSWITCH Where
RCONN Resistance connector contacts (two contacts connector) RCABLE Resistance upstream cable wires (one GND)
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DS9706-02 March 2007
RT9706
RSWITCH Resistance power switch (80m typical RT9706) VPCB voltage drop specification defines maximum resistance contact (RCONN) connector drop across switch 100mV. This basically leaves variables equation resistance switch resistance cable. consumes maximum current (II) 500mA, maximum resistance cable 90m. resistance switch defined follows RSWITCH 4.75V
GND_BUS Board Layout Controller
Locate ceramic bypass capacitors close possible pins RT9706.
VBUS VOUT
4.4V 0.5A VPCB 0.1A NPORTS
90m)
(200mV VPCB 0.1A NPORTS voltage drop across limited 100mV, maximum resistance switch 250m four ports ganged together. RT9706, with maximum 100m on-resistance over temperature, easily meets this requirement. Layout order meet voltage drop, droop, requirements, careful layout necessary. following guidelines must considered Keep VBUS traces short possible least 50-mil, ounce copper VBUS traces. Avoid vias much possible. vias necessary, make them large feasible. Place ground plane under circuitry lower both resistance inductance improve transient performance (Use separate ground power plans possible). Place cuts ground plane between ports help reduce coupling transients between ports. Locate output capacitor ferrite beads close connectors possible lower impedance (mainly inductance) between port capacitor improve transient load performance. Locate RT9706 close possible output port limit switching noise.
DS9706-02 March 2007
Because insertion removal system, components (especially connector pins) subject electrostatic discharge (ESD) should qualified IEC801.2. RT9706 designed withstand human body mode, defined MIL-STD-883C. requirements IEC801.2 much more stringent require additional capacitors RT9706 withstand higher energy. Low-ESR ceramic bypass capacitors output capacitors should placed closely possible VOUT pins increase immunity. RT9706 pass requirements 1000-4-2 50082-1) level-4 15kV discharge contact discharge tests when these capacitors added.
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RT9706
Outline Dimension
Symbol
Dimensions Millimeters 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions Inches 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-5 Surface Mount Package
Richtek Technology Corporation
Headquarter Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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DS9706-02 March 2007

80m, 500mA High-Side Power Switch with Flag RT9706 cost-effective

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