100m Power Distribution Switches RT9701 integrated 100m power swi
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RT9701
100m Power Distribution Switches
RT9701 integrated 100m power switch self-powered bus-powered Universal Series (USB) applications. built-in charge pump used drive N-Channel MOSFET that free parasitic body diode eliminate reversed current flow across switch when powered off. quiescent current (23A) small package (SOT-23-5) particularly suitable battery-powered portable equipment. Several protection functions include soft start limit inrush current during plug-in, current limiting 1.5A meet power requirement, thermal shutdown protect damage under over current conditions.
Features
100m Typ. High-Side NMOSFET (SOT-23-5) Guaranteed 1.1A Continuous Current 1.5A Current Limit Small SOT-23-5 Package Minimizes Board Space Soft Start Thermal Protection Supply Current Wide Input Voltage Range 2.2V Approved #E219878 RoHS Compliant 100% Lead (Pb)-Free
Applications
Battery-Powered Equipment Motherboard Power Switch Device Power Switch Hot-Plug Power Supplies Battery-Charger Circuits
Ordering Information
RT9701 Package Type SOT-23-5 SOT-23-5 (L-Type) Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Configurations
(TOP VIEW)
VOUT VOUT 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.
SOT-23-5
SOT-23-5 (L-Type)
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
Typical Application Circuit
RT9701CBL VOUT VOUT VOUT COUT 470uF
470uF, Electrolytic
DS9701-13 March 2007
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RT9701
Test Circuits
RT9701CBL VOUT VOUT IOUT
VOUT
VIN-SW RT9701CBL VOUT VOUT
VOUT
Switch
Test Circuit
VOUT
Test Circuit
RT9701CB VOUT VOUT
IOUT
Chip Enable
Test Circuit Test Circuit performed charging external tank bulk capacitor input then applying this voltage input unit. typical operating characteristics curves showed referred Test Circuit unless specified Test Circuit Test Circuit
Functional Description
Name VOUT Function Power Input Voltage Output Voltage Ground Chip Enable (Active High)
Function Block Diagram
Bias Current Limit (VIN)
Charge Pump
Control NMOSFET
(VOUT) VOUT
Oscillator
Thermal Detection
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DS9701-13 March 2007
RT9701
Absolute Maximum Ratings
Supply Voltage Chip Enable -0.3V Power Dissipation, 25°C SOT-23-5 0.25W Package Thermal Resistance SOT-23-5, 250°C Lead Temperature (Soldering, sec.) 260°C Operating Junction Temperature Range -20°C 100°C Storage Temperature Range -65°C 150°C VOUT Level (Human Body Mode) (Machine Mode) 800V
Electrical Characteristics
(VIN COUT 25°C, unless otherwise specified)
Parameter Input Voltage Range Output NMOSFET RDS(ON) Quiescent Current Output Turn-On Rising Time Current Limit Threshold Short-circuit Fold Back Current Input High Threshold Input Threshold Shutdown Supply Current Output Leakage Current Under Voltage Lockout Under Voltage Hysteresis Thermal Limit Thermal Limit Hysteresis RT9701CB RT9701CB RT9701CB RT9701CB RT9701CBL RT9701CB
Symbol RDS(ON)
Test Conditions
-0.1
-0.8
Units
-1.1 -2.0
ILIMIT
Settling VOUT measured prior thermal shutdown
IOFF UVLO
-1.3
ILEAKAGE "0", VOUT
DS9701-13 March 2007
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RT9701
Typical Operating Characteristics
Quiescent Current Temperature
Quiescent Current Input Voltage
25°C
Quiescent Current
Quiescent Current (uA)
Temperature
Input Voltage
On-Resistance Temperature
On-Resistance Input Voltage
25°C
On-Resistance
On-Resistance
RT9701CBL
RT9701CB
RT9701CB
RT9701CBL
Temperature
Input Voltage(V)
Current Limit Temperature
2.20 2.00
1.80
Current Limit Input Voltage
1.58
1.35 1.13 0.90 0.68 0.45 0.23 0.00
25°C
Current Limit
1.80 1.60 1.40 1.20 1.00 0.80 0.60
Current Limit
Temperature
Input Voltage
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DS9701-13 March 2007
RT9701
Short Circuit Current Temperature
1400
1950
Short Circuit Current Input Voltage
25°C
1700 1450 1200
Short Circuit Current (mA)1
1200 1100 1000
Short Circuit Current (mA)
1300
Temperature
Input Voltage
Threshold Temperature Threshold Voltage
Threshold Input Voltage Threshold Voltage Input
25°C
Threshold Voltage Threshold
Threshold Voltage Threshold
Rising
Rising
Falling
Falling
Temperature
*Test Circuit
Input Voltage
*Test Circuit
Turn Rising Time Temperature
Turn Falling Time Temperature
Turn-On Rising Time (us)
Turn-Off Falling Time (us)
Ceramic
Ceramic
Temperature
*Test Circuit
Temperature
*Test Circuit
DS9701-13 March 2007
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RT9701
Shutdown Supply Current Temperature
Turn-Off Leakage Current Temperature
Turn-Off Leakage Current (uA)
Shutdown Supply Current (uA)
Temperature
*Test Circuit
Temperature
*Test Circuit
UVLO Threshold Temperature
3.50
Inrush Current Response
3.00
UVLO Threshold
2.50 2.00 1.50 1.00 0.50
100uF 33uF
1A/Div,
0.00
Temperature
Time (100us/Div)
Turn Response
Turn Response
CH1: VEN: 5V/Div CH2: IOUT: 100mA/Div
CH1: VEN: 5V/Div CH2: VOUT: 1V/Div
*Test Circuit
CH3: VOUT: 2V/Div
Time (100us/Div)
Time (50us/Div)
*Test Circuit
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DS9701-13 March 2007
RT9701
UVLO Rising
UVLO Falling
CH1: VIN: 1V/Div CH2: VOUT: 1V/Div CH1: VIN: 1V/Div CH2: VOUT:
Time (500us/Div)
Time (100ms/Div)
*Test Circuit
Inrush Short Circuit Response
CH1: VIN: 2V/Div
Soft start Short Circuit Response
CH1: VIN: 2V/Div
VDROP=1.2V, depend IPEAK depend
CH2: IOUT: 1A/Div
CH2: 10A/Div
1uF, 1000uF
Time (25us/Div)
Time (5us/Div)
Ramped Load Response
VOUT 4.6V VOUT= 4.9V
Current Limit Response
Loading trigger
Current Limit Threshold
1.1V
CH2: IOUT: 500mA/Div CH2: IOUT: 1A/Div 0.1uF
Time (1ms/Div)
Time (5us/Div)
DS9701-13 March 2007
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RT9701
Thermal Shut Response
Dowm
Current Limiting Short Protection current limit circuit designed protect system supply, MOSFET switch load from damage caused excessive currents. current limit threshold internally allow minimum 1.1A through MOSFET limits output current approximately 1.5A typical. When output short ground, will limit constant current until thermal shutdown short condition removed.
RT9701CBL VOUT COUT VOUT VOUT1 VOUT2 COUT
Thermal Shut Down
CH1: 5V/Div, CH3: IOUT@RL1: 1A/Div CH2: IOUT@short: 1A/DiV,
Time (50ms/Div)
Application Information
RT9701 high-side single N-Channel MOSFET switch with active-high enable input. Input Output (input) power supply connection circuitry drain output MOSFET. VOUT (output) source output MOSFET. typical circuit, current flows through switch from VOUT toward load. Both VOUT pins must short board connected load both pins connected power source. Thermal Shutdown Thermal shutdown shuts output MOSFET temperature exceeds 130°C 20°C hysteresis forces switch turning until temperature drops 110°C. Soft Start order eliminate upstream voltage droop caused large inrush current during hot-plug events, soft-start" feature effectively isolates power supplies from such highly capacitive loads. Under-voltage Lockout UVLO prevents MOSFET switch from turning until input voltage exceeds 1.8V (typical). input voltage drops below 1.8V (typical), UVLO shuts MOSFET switch.
1uF, COUT 470uF (Low ESR) 1uF, COUT 330uF (Low ESR) Notebook 10uF, COUT device
Figure High Side Power Switch
RT9701CB VOUT VOUT VOUT1 COUT
VOUT2 COUT
Chip Enable
Figure High Side Power Switch with Chip Enable Control Filtering limit input voltage drop during hot-plug events, connect ceramic capacitor from GND. However, higher capacitor values will further reduce voltage drop input. Connect sufficient capacitor from VOUT GND. This capacitor helps prevent inductive parasitics from pulling VOUT negative during turn-off damage other components during hot-detachment. also necessary meeting specification during plug-in operation. RT9701 implanted device application, minimum capacitor from VOUT recommended higher capacitor values also preferred.
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DS9701-13 March 2007
RT9701
choosing these capacitors, special attention must paid Effective Series Resistance, ESR, capacitors minimize drop across capacitor ESR. lower this capacitor lower drop during operation. Ferrite beads series with power ground lines recommended eliminate significantly reduce EMI. selecting ferrite bead, resistance wire used must kept minimum reduce voltage drop. Reverse current preventing output MOSFET driver circuitry also designed allow MOSFET source externally forced higher voltage than drain (VOUT prevent reverse current from such condition, disable switch (RT9701CB) connect fixed voltage under 1.3V.
Layout Thermal Dissipation Place switch close connector possible. Keep traces short possible reduce effect undesirable parasitic inductance. Place capacitor ferrite beads asclose connector possible. ferrite beads used, wires with minimum resistance large solder pads minimize connection resistance. package with dual VOUT pins, short both same function pins Figure Figure reduce internal turn-on resistance. output power will delivered individual ports, specially necessary short both VOUT switch output side order protect switch when each port plug-in separately. Under normal operating conditions, package dissipate channel heat away. Wide power-bus planes connected VOUT ground plane contact with device will help dissipate additional heat.
DS9701-13 March 2007
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RT9701
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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DS9701-13 March 2007
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