80m, Smart Universal Power Switch with Flag RT9703 voltage, high

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80m, Smart Universal Power Switch with Flag RT9703 voltage, high

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RT9703
80m, Smart Universal Power Switch with Flag
RT9703 voltage, high performance single N-MOSFET power switch, designed power rail on/off control with RDS(ON) full protection functions. RT9703 equipped with charge pump circuitry drive internal MOSFET switch flag output available indicate fault conditions against large di/dt which cause supply fall regulation. order different application, offered current limit point setting, resistor from ground sets current limit switch. 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, precision resistor-programmable output current limit 3.5A. Besides, lower quiescent current making this device ideal portable battery-operated equipment. RT9703 available SOP-8 package requiring minimum board space smallest components.
Features
Adjustable Current Limiting 3.5A Built-In (Typically 80m) N-MOSFET Reverse Current Flow Blocking body diode) i.e. Output Forced Higher than Input (Off-State) Supply Current Typical Switch State Less than Typical Switch State Guaranteed 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) Thermal Shutdown Protection Smallest SOP-8 Package Minimizes Board Space RoHS Compliant 100% Lead (Pb)-Free
Applications
Monitor, LCD-TV Power Module ADSL Information Appliance Set-Top Battery-Powered Equipment Hot-Plug Power Supplies ACPI Power Distribution Power Switching Motherboard Notebook Card Swap Application
Ordering Information
RT9703 Package Type SOP-8 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Configurations
(TOP VIEW)
VOUT VOUT
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.
SOP-8
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RT9703
Typical Application Circuit
Pull-Up Resistor (10K 100K) Supply Voltage 10uF Chip Enable RT9703 VOUT 33uF
Fault Flag RSET
Peripheral
Functional Description
Name VOUT Function Power Input Voltage Output Voltage Ground Chip Enable (Active High) Open-Drain Fault Flag Output Current Limit Programming Input
Function Block Diagram
Bias
UVLO
Gate Control Output Voltage Detection VREF
Oscillator
Charge Pump
Thermal Protection
VOUT
Delay
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RT9703
Test Circuits
ISUPPLY
ISUPPLY
VFLG VOUT
IOUT
RT9703 VOUT
ILEAKAGE
RT9703 VOUT
RSET
Chip Enable
COUT RSET
Chip Enable
VRDS(ON)
IOUT VOUT
RT9703
COUT
VOUT COUT
VFLG
VOUT
Note: Above test circuits reflected graphs shown Typical Operating Characteristics" follows: 1-Turn-On Rising Turn-Off Falling Time Temperature, Turn-On Response, Flag Response Chip Enable, Flag Response (Enable into Current Limit) 2-On-State Off-State Supply Current Input Voltage/Temperature, Turn-Off Leakage Current Temperature 3-On-Resistance Input Voltage/Temperature 4-EN Threshold Voltage Input Voltage/Temperature, Flag Delay Time Input Voltage/Temperature, UVLO Threshold Temperature, UVLO Rising Falling 5-Current Limit Input Voltage/Temperature/RSET, Current Limit Factor RSET, Short Circuit Current Input Voltage, Inrush Current Response, Soft-Start Response, Current-Limit Short Circuit with Thermal Shutdown, Short-Circuit Response DS9703-08 March 2007 www.richtek.com
RSET
RT9703
RSET
RT9703 VOUT RSET COUT
IOUT
VOUT
RT9703
Absolute Maximum Ratings
(Note Supply Voltage 6.5V Chip Enable Input Voltage -0.3V 6.5V Flag Voltage 6.5V Power Dissipation, 25°C SOP-8 0.95W Package Thermal Resistance SOP-8, 104°C/W Junction Temperature 125°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
Electrical Characteristics
(VIN COUT 25°C, unless otherwise specified)
Parameter Switch Resistance Supply Current
Symbol RDS(ON) ISW_ON ISW_OFF
Test Conditions IOUT (Note Switch VOUT Open Switch Off, VOUT Open Switch Switch 5.5V RLOAD VOUT rising ILIM RSET 3.3V 5.5V, RSET ILIMSET 0.5A (RSET 420k 70k) ISINK
-2.0
210k 0.01
-3.5
Units
Threshold Logic-Low Voltage (Note Logic-High Voltage Input Current Output Leakage Current Output Turn-On Rise Time Current Limit Factor (Note Max. Current Limit Setting (Note ILIMSET Current Limit Setting Accuracy FLAG Output Resistance FLAG Current FLAG Delay Time (Note Under-Voltage Lockout Under-Voltage Hysteresis ILIMSET RFLG ILEAKAGE TON_RISE
IFLG_OFF VFLG VUVLO VUVLO Form fault condition assertion increasing decreasing
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RT9703
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 FLAG delay time input voltage dependent, Typical Operating Characteristics" graph further details. Note Current limit determined ILIMIT 210k/RSET, where RSET ohms. Note important note that maximum current limit value shall properly accordance with supply voltage otherwise which result failure occurrence. Maximum Current Limit Supply Voltage" graph shown applications information section further details. Note input voltage lower than threshold level will subject ±0.6V deviation throughout operating junction temperature range. Refer Typical Operating Characteristics" graph further details. Note RDS(ON) measured constant junction temperature using current pulse.
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RT9703
Typical Operating Characteristics
On-State Supply Current Input Voltage
Off-State Supply Current Input Voltage
10uF Open RSET 100k
10uF COUT 33uF Open RSET 100k
Supply Current (uA)
Supply Current (uA)
-0.5 -1.5
Input Voltage
Input Voltage
On-State Supply Current Temperature
Off-State Supply Current Temperature
10uF
10uF COUT 33uF Open RSET 100k
Supply Current (uA)
Supply Current (uA)
COUT 33uF Open RSET 100k
-0.5 -1.5
Temperature
Temperature
Current Limit Input Voltage
10uF, COUT 33uF 0.5, RSET 116k
Current Limit Temperature
10uF, COUT 33uF RSET 116k
Current Limit
Current Limit
Input Voltage
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Temperature
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RT9703
Current Limit RSET
On-Resistance Input Voltage
10uF, COUT 33uF
IOUT 0.5A, RSET 10uF, COUT 33uF
On-Resistance
Current Limit
RSET
Input Voltage
On-Resistance Temperature
IOUT 0.5A, RSET 10uF, COUT 33uF
Short Circuit Current Response
10uF, COUT 0.1uF RSET 175k, VOUT (5V/Div)
On-Resistance
IOUT (0.5A/Div)
Time (10ms/Div)
Temperature
Inrush Current Response
Threshold Voltage Input Threshold Voltage Input Voltage
10uF, COUT 33uF 100mA, RSET 100k
Threshold Voltage Threshold Voltage
COUT 1000uF COUT 470uF
COUT (1A/Div) 10uF 0.5, RSET 175k,
Time (5ms/Div)
Input Voltage
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RT9703
Threshold Voltage Temperature Threshold Voltage
100mV RSET 100k 10uF, COUT 33uF
Turn-On Rising Time Temperature
10uF, COUT RSET 200k
Threshold Voltage Thresold Voltage
Turn-On Rising Time (ms)
Temperature
Temperature
Turn-Off Falling Time Temperature
Turn-Off Leakage Current Temperature
Turn-Off Leakage Current (uA)
10uF, COUT RSET 200k
10uF, COUT 33uF RSET 100k
Turn-Off Falling Time (us)
-0.1 -0.2 -0.3
Temperature
Temperature
Flag Dealy Time Input Voltage
10uF, COUT 33uF 0.5, RSET 100k
Flag Delay Time Temperature
10uF, COUT 33uF 0.5, RSET 100k
Flag Delay Time (ms)
Flag Delay Time (ms)
Input Voltage
Temperature
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RT9703
UVLO Threshold Temperature
10uF, COUT 33uF RSET 100k
Turn-On Response
UVLO Threshold
(5V/
VOUT (1V/
10uF, COUT RSET 200k
Time (250us/Div)
Temperature
Turn-Off Response
10uF, COUT RSET 200k (5V/Div)
UVLO Rising
VOUT (5V/Div)
(1V/Div) (100mA/Div) VOUT (1V/Div)
1000uF, COUT
Time (100us/Div)
Time (1ms/Div)
UVLO Falling
1000uF, COUT RSET 200k
FLAG Response when Enable into Current Limit
(5V/Div)
VFLG (5V/Div) 1uF, COUT 33uF 0.5, RSET 175k
(1V/Div) VOUT (1V/Div)
(1A/Div)
Time (25ms/Div)
Time (1ms/Div)
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RT9703
FLAG Response Chip Enable
Current Limit with Thermal Shutdown
10uF COUT 33uF 0.5, RSET 116k
(5V/Div)
VFLG (5V/Div) 1uF, COUT 33uF 0.5, RSET 420k
(5V/Div)
(0.5A/Div)
(1A/Div)
Time (10ms/Div)
Time (50ms/Div)
Short- Circuit with Thermal Shutdown
10uF, COUT 33uF RSET 140k,
Soft-Start Response with Current Limit
(5V/Div) VTRIGGER (5V/Div) (5V/Div)
VOUT (5V/Div)
(0.5A/Div)
(2A/Div)
10uF, COUT 0.5, RSET
Time (10ms/Div)
Time (1ms/Div)
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DS9703-08 March 2007
RT9703
Applications Information
RT9703 high-side, N-Channel, power switch available with active-high enable input. RDS(ON)dd full protection functions make optimized replace complex discrete on/off control circuitry. 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, RT9703 prevents reverse current flow VOUT being externally forced higher voltage than when output disabled (VEN 0.8V). Fault Flag RT9703 provides signal which N-Channel open drain MOSFET output. This open drain output goes when VOUT -1V, current limit temperature exceeds 130°C approximately. output capable sinking 10mA load typically 150mV 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 highly large capacitive load connected causes high transient inrush current that exceeds current limit threshold. response delay time typically 4.6ms. 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 chip enable input enabled. Current Limiting Short-Circuit Protection current limit circuitry prevents damage MOSFET switch external load. user adjust- able with external resistor, RSET, ILIMIT 210k/RSET range 0.5A accuracy current limit point vary with operating temperature supply voltage. "Typical Operating Characteristics" graph further details.
Normal MOSFET
Chip Enable Input
RT9703
switch will disabled when logic condition. During this condition, internal circuitry MOSFET turned off, reducing supply current 0.1A typically. maximum guaranteed voltage logic 0.8V. minimum guaranteed voltage will turn RT9703 back Floating input cause unpredictable operation. should allowed negative with respect GND. directly tied keep part 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.
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RT9703
normal current limit value, ILIMIT, with external resistor between (pin (pin When heavy load short circuit applied enabled switch, large transient current flow until current limit circuitry responds. Once this current limit threshold exceeded, device enters constant current mode until thermal shutdown occurred fault removed. important note that maximum current limit value shall properly accordance with supply voltage otherwise result failure occurrence. graph below shows maximum current limit supply voltage safe operation area. 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) IOUT2 Although devices rated 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) Where TJ(MAX) maximum junction temperature (100°C) maximum ambient temperature. junction ambient thermal resistance (JA) SOP8 package recommended minimum footprint 104°C/ layout dependent). Supply Filter/Bypass Capacitor low-ESR ceramic capacitor from (the amount capacitance increased without limit), 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. important note award parasitic inductance traces cause over-voltage transients trace even tens inductance. recommended aluminum electrolytic acted supply capacitor prevent device from being damaged. input transient MUST exceed 6.5V absolute maximum supply voltage even short duration.
Maximun Current Limit Supply Voltage
25°C
Maximun Current Limit
Supply Voltage
Thermal Shutdown Thermal shutdown employed protect device from damage temperature exceeds approximately 130°C. enabled, switch automatically restarts when temperature falls 10°C. output signal will continue cycle until device disabled fault removed. Power Dissipation device's junction temperature depends several factors such load, layout, ambient temperature package type. output RT9703 deliver current over full operating junction temperature range. However, maximum output current must derated higher ambient temperature ensure
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RT9703
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 eliminates short-duration transients.
Layout order meet voltage drop, droop, requirements, careful layout necessary. following guidelines must considered: Keep input output traces short possible least 150-mil ounce copper races. 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). Locate bypass capacitors close possible input output RT9703.
Board Layout
VOUT
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RT9703
Outline Dimension
Dimensions Millimeters Symbol 4.801 3.810 1.346 0.330 1.194 0.170 0.050 5.791 0.400 5.004 3.988 1.753 0.508 1.346 0.254 0.254 6.200 1.270
Dimensions Inches 0.189 0.150 0.053 0.013 0.047 0.007 0.002 0.228 0.016 0.197 0.157 0.069 0.020 0.053 0.010 0.010 0.244 0.050
8-Lead Plastic 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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DS9703-08 March 2007

80m, Smart Universal Power Switch with Flag RT9703 voltage, high

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