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 NMOSFET that free parasitic body diode eliminate reversed current flow across switch when powered off. quiescent supply current (23µA) small package (SOT-25) 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- Guaranteed 1.1A Continuous Current 1.5A Current Limit Small SOT- Package Minimizes Board Space Soft Start Thermal Protection 23µA Supply Current Wide Input Voltage Range: 2.2V Approved #E219878
Configurations
Part Number RT9701CBL (Plastic SOT-25) Configurations
VIEW
Applications
Battery-Powered Equipment Motherboard Power Switch Device Power Switch Hot-Plug Power Supplies Battery-Charger Circuits RT9701CB (Plastic SOT-25)
VOUT VOUT
VIEW
Ordering Information
RT9701 Package type SOT-25 SOT-25 Operating temperature range Commercial standard
VOUT VOUT
Typical Application Circuit
RT9701 VOUT VOUT *COUT VOUT
Marking Information
Part Number RT9701CBL RT9701CB Marking
470µF, Electrolytic
DS9701-05 October 2001
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RT9701
Description
Name VOUT Function Power Input Output Voltage Ground Chip Enable
Test Circuits
RT9701
VOUT IOUT
VOUT VOUT
Test Circuit
VIN-SW RT9701 VOUT VOUT
VOUT
Switch
Test Circuit
RT9701
VOUT IOUT
VOUT VOUT
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
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DS9701-05 October 2001
RT9701
Function Block Diagram
Bias Current Limit Charge Pump (VIN)
Control NMOSFET
(VOUT) VOUT
Oscillator
Thermal Detection
Absolute Maximum Ratings
Supply Voltage Chip Enable Power Dissipation, 25°C SOT-25 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-25, VOUT Level (Human Body Mode) (Machine Mode) -0.3V 0.25W -20°C 100°C -65°C 150°C 250°C 800V
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RT9701
Electrical Characteristics
(VIN COUT 1µF, 25°C, unless otherwise specified) Parameter Input Voltage Range RT9701CBL Output NMOFET RDS(ON) Supply 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 IOFF UVLO ILIMIT RT9701CB RDS(ON) Symbol Settling VOUT measured prior thermal shutdown Test Conditions -1.1 -2.0 -1.3 -Typ -100 -0.1 -0.8 Units
ILEAKAGE "0", VOUT
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DS9701-05 October 2001
RT9701
Typical Operating Charateristics
Supply Current Temp.
Supply Current Voltage
Quiessent Current
Quiescent Current
Temperature
Voltage Voltage
On-Resistance Temp.
RT9701CB RT9701CBL
On-Resistance Voltage
25°CC RT9701CBL RT9701CBL
On-Resistance (mOhm)
On-Resistance
Temperature (°C)
VVoltage Voltage
Current Limit Temp.
2.20 2.00
Current Limit Voltage
1.80
25°C
1.58 1.35 1.13 0.90 0.68 0.45 0.23 0.00
Current Limit
1.60 1.40 1.20 1.00 0.80 0.60
Current Limit
1.80
Temperature
VVoltage (V)(V) Voltage
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RT9701
Short Circuit Current Temp.
1400
1950
Short Circuit Current Voltage
Short Circuit Current (mA)
1700 1450 1200
1300
Short Circuit Current (mA)
1200 1100 1000
Temperature
VVoltage (V)(V) Voltage
Threshold Temp.
Threshold Voltage
Threshold
Threshold
Rising Falling
Rising
Falling
Temperature
*Test Circuit
VVoltage (V)(V) Voltage
*Test Circuit
Turn Rising Time Temp.
Turn Falling Time Temp.
Turn-Off Falling Time
Turn-On Rising Time
Ceramic Temperature (°C)
*Test Circuit
Ceramic
Temperature
*Test Circuit
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DS9701-05 October 2001
RT9701
Shutdown Supply Current Temp.
Turn-Off Leakage Current Temp.
Turn-Off Leakage Current
Turn-Off Supply Current
Temperature
*Test Circuit
Temperature
*Test Circuit
UVLO Threshold Temp.
3.50
Inrush Current Response
3.00
UVLO Threshold
2.50 2.00 1.50 1.00 0.50 0.00
100µF 33µF
1A/Div =1A/Div
Temperature
==1,
Time (100µS/Div) 100µS/Div
Turn-On Response
Turn-Off Response
CH1: 5V/Div CH2: VOUT 1V/Div
*Test Circuit
CH1: 5V/Div CH2: IOUT 100mA/Div; CH3: VOUT 2V/Div Time (50µS/Div)
*Test Circuit
Time (100µS/Div)
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RT9701
UVLO Rising
UVLO Falling
CH1: 1V/Div CH2: VOUT 1V/Div Time (500µS/Div)
CH1: 1V/Div CH2: VOUT 1V/Div
*Test Circuit
Time (10mS/Div)
Inrush Short Circuit Response
Soft-start Short Circuit Response
VDROP =1.2V, depend IPEAK depend
CH1>
CH1>
CH2>
2V/Div 10A/Div 1000µF 25µS/Div
2V/Div IOUT 1A/Div 50µS/Div
Ramped Load Response
VOUT
4.9V
Current Limit Response
VOUT 4.6V
Loading trigger
Current Limit Threshold
1.1A
CH2>
CH2: IOUT 500mA/Div 1mS/Div
CH2: IOUT 1A/Div ILOAD 1A/Div
0.1µF
5µS/Div
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DS9701-05 October 2001
RT9701
Thermal Shut Down Response
Thermal Shut Down
CH1: 5V/Div CH3: IOUT@RL1ohm 1A/Div 1A/Div 500mA/Div CH2: IOUT@short 1A/Div 500mA/Div 50mS/Div Time (50mS/Div)
Functional Description
RT9701 high-side single N-channel 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.
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.
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RT9701
Applications Information
RT9701CBL COUT VOUT VOUT1 VOUT COUT VOUT2
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
COUT 470µF (Low ESR) COUT 330µF (Low ESR) Notebook device
Fig. High Side Power Switch
RT9701CB COUT COUT VOUT VOUT VOUT1 VOUT2
Place switch close connector possible. Keep traces short possible reduce effect undesirable parasitic inductance. Place output capacitor ferrite beads close 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 Fig.1 Fig.2 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 powerbus planes connected VOUT ground plane contact with device will help dissipate additional heat.
Fig. 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 hotdetachment. also necessary meeting specification during plug-in operation. RT9701 implanted device application, minimum capacitor from VOUT recommended higher capacitor values also preferred. choosing these capacitors, special attention must paid Effective Series Resistance, ESR, capacitors minimize drop across capacitor's ESR. lower this capacitor lower drop during operation.
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DS9701-05 October 2001
RT9701
Package Information
Symbol
Dimensions Millimeters 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.102 0.356 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 0.004 0.014 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT- Surface Mount Package
DS9701-05 October 2001
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RT9701
RICHTEK TECHNOLOGY CORP.
Headquarter
Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taipei, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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