80m, 500mA/1.1A High-Side Power Switches with Flag RT9702 RT9702A
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RT9702/A
80m, 500mA/1.1A High-Side Power Switches with Flag
RT9702 RT9702A cost-effective, voltage, single N-Channel MOSFET high-side power switches, optimized self-powered bus- powered Universal Serial (USB) applications. RT9702/A 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, fault current limited typically 800mA RT9702 single port 1.5A RT9702A dual ports accordance with power requirements, lower quiescent current making this device ideal portable battery-operated equipment. RT9702/A available SOT-23-5 TSOT-23-5 packages 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 Typical Switch State Guaranteed 500mA/RT9702 1.1A/RT9702A 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 TSOT-23-5 Packages Minimizes Board Space Approved-E219878 IEC60950-1 2005 Certified RoHS Compliant 100% Lead (Pb)-Free
Applications
Bus/Self Powered Hubs Peripherals ACPI Power Distribution Card Swap Notebook, Motherboard Battery-Powered Equipment Hot-Plug Power Supplies Battery-Charger Circuits
Ordering Information
RT9702/A Package Type SOT-23-5 TSOT-23-5 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard) 1.1A Output Current 500mA Output Current
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
Note RichTek Pb-free Green products RoHS compliant compatible with current requirements IPC/JEDEC J-STD-020. Suitable SnPb Pb-free soldering processes. 100% matte (Sn) plating.
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RT9702/A
Configurations
(TOP VIEW)
VOUT
Functional Description
Name VOUT
Function Power Input Voltage Output Voltage Ground Chip Enable (Active High) Open-Drain Fault Flag Output
SOT-23-5/TSOT-23-5
Typical Application Circuit
Pull-Up Resistor (10K 100K) (Optional) Flag Transient Filtering) Controller Supply Voltage 0.1uF RT9702/A VOUT 10uF 150uF VBUS DGND Ferrite Beades Over -Current
Chip Enable
Data
Note: low-ESR 150F aluminum electrolytic tantalum between VOUT strongly recommended meet 330mV maximum droop requirement VBUS. (see Application Information Section further details)
Function Block Diagram
Bias UVLO Current Limiting
Oscillator
Charge Pump
Gate Control Output Voltage Detection
VOUT
Thermal Protection
Delay
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Test Circuits
ISupply
VFLG ILEAK
VFLG IOUT VOUT
RT9702/A VOUT
RT9702/A VOUT
Chip Enable
COUT
Chip Enable
VRDS(ON)
IOUT VOUT
VFLG VOUT
RT9702/A
COUT
RT9702/A VOUT COUT
Chip Enable
VFLG IOUT VOUT
RT9702/A 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 DS9702/A-11 June 2007 www.richtek.com -Supply Current Input Voltage Temperature, Switch Supply Current Temperature, Turn-Off Leakage Current
RT9702/A
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, TSOT-23-5 0.4W Package Thermal Resistance (Note SOT-23-5, TSOT-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) 800V
Recommended Operating Conditions
(Note
Supply Input Voltage 5.5V Chip Enable Input Voltage 5.5V Junction Temperature Range -20°C 100°C Ambient Temperature Range -40°C 85°C
Electrical Characteristics
(VIN COUT 25°C, unless otherwise specified)
Parameter Switch Resistance RT9702 RT9702A Supply Current Logic-Low Voltage
Symbol RDS(ON) ISW_ON ISW_OFF
Test Conditions IOUT 500mA IOUT 1.1A switch VOUT Open switch off, VOUT Open 5.5V, switch 5.5V, switch 5.5V
-2.0 -0.5
-0.01 0.01
-1.1 -400
Units
Threshold
Logic-High Voltage Input Current Output Leakage Current Output Turn-On Rise Time Current Limit Short Circuit FoldBack Current RT9702 RT9702A RT9702 RT9702A ISC_FB RFLG IFLG_OFF ILIM
ILEAKAGE RLOAD TON_RISE VOUT rising RLOAD VOUT measured prior thermal shutdown ISINK VFLG From fault condition assertion
FLAG Output Resistance FLAG Current FLAG Delay Time (Note
continued
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RT9702/A
Parameter Under-voltage Lockout Under-voltage Hysteresis Thermal Shutdown Protection Thermal Shutdown Hysteresis Symbol VUVLO VUVLO Test Conditions increasing decreasing -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 thermal conductivity single layer test board JEDEC 51-3 thermal measurement standard. Note FLAG delay time input voltage dependent, see" Typical Operating Characteristics" graph further details.
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RT9702/A
Typical Operating Characteristics
Supply Curent Input Voltage
(U.U.T: RT9702ACB, unless otherwise indicated)
Supply Current Temperature
Open 33uF, COUT 33uF
33uF
Supply Current (uA)
Supply Current (uA)1
Open
Input Voltage
Temperature
Current Limit Input Voltage
Current Limit Input Voltage
RT9702
Current Limit
Current Limit
33uF, COUT= 33uF Off,
33uF, COUT= 33uF
Off,
Input Voltage
Input Voltage
On-Resistance Input Voltage
On-Resistance Temperature
COUT 33uF
On-Resistance
On-Resistance
IOUT 1.1A
COUT 33uF IOUT 1.1A
Input Voltage
Temperature
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Short Circuit Current Response
2.00
Short Circuit Current Temperature
1.80 1.60 1.40 1.20 1.00 0.80 0.60
Short Circuit Current
COUT 33uF
VOUT
VIN=5V, S2=S3=On CIN=33uF
IOUT
COUT=0.1uF
Temperature(°
Threshold Voltage Voltage Threshold Voltage Input Input
Threshold Voltage Temperature Threshhold Voltage Temperature
COUT 33uF
Threshold Voltage Threshold Voltage
Threshold Voltage(V) Threshold Voltage
100mA
COUT 33uF 100mA
Input Voltage
Temperature
Turn-On Rising Time Temperature
Turn-Off Falling Time Temperature
Turn-On Rising Time (us)
Turn-Off Falling Time (us)
33uF, COUT
33uF, COUT=
Temperature
Temperature(°
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RT9702/A
Switch Supply Current Temperature
Turn-Off Leakage Current Temperature
Switch Supply Current (uA)
-0.2 -0.4 -0.6 -0.8
COUT 33uF Open
Turn-off Leakage Current (uA)
COUT 33uF
Temperature(°
Temperature
FLAG Delay Time Input Voltage
FLAG Delay Time Temperature
COUT 33uF
COUT 33uF
Delay Time (ms)
Delay Time (ms)
Input Voltage
Temperature(°
2.40 2.20 2.00
UVLO Threshold Temperature
Current Limit Temperature
COUT 33uF On,S3
CIN=COUT=33uF
RL=1k
UVLO Threshold
Current Limit
1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40
Temperature
Temperature
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RT9702/A
Turn- Response
(5V/DIV)
Turn- Response
(1V/DIV)
VOUT
VIN=5V, VIN=5V, RL=30 CIN=33uF,COUT=1uF CIN=33uF, COUT=1uF S1=On 1=On
(0.5A/DIV) (5V/DIV) (5V/DIV)
VOUT
VIN=5V, S1=Off CIN=33uF COUT=1uF
Time (100s DIV)
Time (100s DIV)
UVLO Rising
UVLO Falling
VIN=5V, CIN=33uF, COUT=1uF
(1V/DIV) (1V/DIV)
VOUT
VOUT
CIN=33uF, COUT=1uF
VOUT
VIN=5V,
(1V/DIV) (1V/DIV)
VOUT
Time (1ms DIV)
Time (10ms DIV)
Soft- Start Response
S2:Off
Ramped Load Response
4.9V
(5V/DIV)
(5V/DIV)
VOUT
1.1A
(0.5A/DIV)
CIN=33uF, COUT=1uF
VIN=5V, RL=1
(0.5A/DIV)
VIN=5V RL=1k
CIN=33uF,COUT=1uF
Time (50s DIV)
Time (100ms DIV)
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RT9702/A
Flag Response (Enable into Short Circuit)
RT9702CB
Flag Response
(5V/DIV) (5V/DIV)
(5V/DIV) (5V/DIV)
12ms (tD)
VFLG
VOUT
12ms CIN=0.1uF, COUT=33uF RL=1 S1=On
VFLG
(0.5A/DIV)
RL=0 S1=On
Time (2.5ms DIV)
CIN=33uF,COUT=1uF
(1A/DIV)
Time (10ms DIV)
Current Limit Transient Respones
Current Limit (5V/DIV)
Thermal Shutdown Response
S2=On
VTRIGGER
(5V/DIV)
IOUT(1A/DIV) IOUT(1A/DIV)
S3=Off RL=1
S3=On
Short
(1A/DIV)
IOUT
VIN=5V,CIN=COUT=33uF S2=On ,S3=Off,RL=1
CIN=33uF COUT=1uF
Time (5us DIV)
Time (50ms DIV)
Short Circuit Current Response
COUT=1uF VIN=5V, RL=1 CIN=33uF S2=On, S3=Off COUT=1000uF COUT=220uF
IOUT
Time (10ms DIV)
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RT9702/A
Applications Information
RT9702 RT9702A single N-Channel MOSFET high-side power switches with active-high enable input, optimized self-powered bus-powered Universal Serial (USB) applications. RT9702/A 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, RT9702/A prevents reverse current flow VOUT being externally forced higher voltage than when output disabled (VEN 0.8V). 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 RT9702/A provides signal which NChannel 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. 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. response delay time typically 10ms. Under-Voltage Lockout
Normal MOSFET
Chip Enable Input
RT9702/A
switch will disabled when logic 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 RT9702/A back Floating input cause unpredictable operation. should allowed negative with respect GND. directly tied keep part
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 RT9702 1.5A RT9702A respectively. When heavy load short circuit applied enabled switch, large transient current flow
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RT9702/A
until current limit circuitry responds. 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 approxi- mately 130°C. enabled, switch automatically restarts when temperature falls 20°C. output signal will continue cycle until device disabled fault removed. Power Dissipation device junction temperature depends several factors such load, layout, ambient temperature package type. output RT9702/A deliver current 500mA, 1.1A 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
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. 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 RT9702/A power distribution allow designers design hubs that operate through faults. RT9702/A have on-resistance internal fault-reporting circuitry that help designer meet voltage regulation fault notification requirements.
Although devices rated 500mA 1.1A output current, application limit amount output current based total power dissipation ambient temperature. final operating junction temperature conditions estimated following thermal equation: (MAX) (MAX) Where (MAX) maximum junction temperature (100°C) maximum ambient temperature. junction ambient thermal resistance (JA) SOT-23-5 TSOT-23-5 package recommended minimum footprint 250°C/W layout dependent).
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RT9702/A
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 4.40V 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 (0.1A NPORTS RSWITCH VPCB Where RCONN Resistance connector contacts (two contacts connector) RCABLE Resistance upstream cable wires (one GND) RSWITCH Resistance power switch (80m typical RT9702/A) 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 4.4V 0.5A ]-VPCB 0.1A NPORTS (200mV VPCB 0.1A NPORTS voltage drop across limited 100mV, maximum resistance switch 250m four ports ganged together. RT9702/A, with maximum 100m on-resistance over temperature, easily meets this requirement.
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RT9702/A
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 RT9702/A close possible output port limit switching noise. Locate ceramic bypass capacitors close possible pins RT9702/A.
VBUS VOUT
Because insertion removal system, components (especially connector pins) subject electrostatic discharge (ESD) should qualified IEC801.2. RT9702/A designed withstand human body mode, defined MIL-STD-883C. requirements IEC801.2 much more stringent require additional capacitors RT9702/A withstand higher energy. Low-ESR ceramic bypass capacitors output capacitors should placed closely possible VOUT pins increase immunity. RT9702/A pass requirements 1000-4-2 50082-1) level-4 15kV discharge contact discharge tests when these capacitors added.
GND_BUS Board Layout Controller
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RT9702/A
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
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RT9702/A
Symbol
Dimensions Millimeters 0.700 0.000 1.397 0.300 2.591 2.692 0.838 0.080 0.300 1.000 0.100 1.803 0.559 3.000 3.099 1.041 0.254 0.610
Dimensions Inches 0.028 0.000 0.055 0.012 0.102 0.106 0.033 0.003 0.012 0.039 0.004 0.071 0.022 0.118 0.122 0.041 0.010 0.024
TSOT-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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DS9702/A-11 June 2007
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