HotSwitch Power Distribution Switch With Shutdown Designed meet s

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HotSwitch Power Distribution Switch With Shutdown Designed meet s

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power distribution switches high-side N-channel MOSFET switches with built-in overcurrent protection on-state resistance. SC2041 switch designed meet requirements power switching maintenance-free fault protection self-powered bus-powered applications. SC2041 features on-state resistance meet requirement voltage drop regulation. switch controlled shutdown input that compatible with logic. device active when shutdown input low. device provides short circuit current limiting value less than 1.0A, well below limit During overcurrent condition device provides fault notification signal controller. integrated thermal protection circuit automatically shuts switch when junction temperature reaches thermal limit. switch remains until junction temperature drops approximately 20°C. switch will continue cycle until fault removed. Inrush current limiting prevents voltage drop upstream port when switch enabled. undervoltage lockout circuit guarantees switch initially during start-up. SC2041 available popular SO-8 package.
HotSwitch Power Distribution Switch With Shutdown
Designed meet specification revisions
power management requirements recognition (pending) 500mA continuous load current High-side MOSFET switch with RDS(ON) Short-circuit current protection Internal thermal shutdown Undervoltage lockout Open drain fault output Soft start circuit with slow turn-on time Wide supply voltage range: 2.8V 5.5V 2.5kV rating (Human Body Model) Full industrial temperature range SO-8 package
SC2041
Applications
Universal Serial (USB) power management Self-powered bus-powered hubs Root hubs desktop servers Notebook Peripherals
Typical Application Circuit
VBUS Shutdown Signal From Controller SHDN SC2041 VBUS
Flag Output Controller 0.1uF 0.1uF 22uF
Revision January 2001
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SC2041
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Voltage Range Output Voltage Range Shutdown Input Flag Output onti nuous Output urrent Thermal Impedance Juncti Ambi Thermal Impedance Juncti Operati Ambi Temperature Range Operati Juncti Temperature Range Storage Temperature Range Lead Temperature (Solderi seconds Rati (Human Body Model) mbol VOUT VSHDN TSTG Maximum -0.3 -0.3 -0.3 -0.3 (VIN 0.3V) Internally +125 +150 nits
Electrical Characteristics
Unless specified: 25°C, VSHDN GND, IOUT 500mA. Values bold apply over full operating temperature range.
Parameter Supply Voltage Range Supply urrent
mbol
onditions
nits
3.3V
5.0V
VSHDN 5.5V (OFF) Power Switch Resi stance 3.3V
5.0V
Output Leakage urrent Output Turn elay(1)
2001 Semtech Corp.
IL(OFF) td(ON)
VSHDN 5.5V, VOUT ROUT 10W,
0.01
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SC2041
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter ont.) Output Turn me(1) Output Turn elay(1) Output Turn Fall me(1) urrent Limit Short rcui urrent urrent Threshold Level Input Voltage Level Input Voltage Input urrent ISHDN 2.8V 5.5V 2.8V 5.5V VSHDN 5.5V, VOUT OPEN VSHDN IOUT 0mA, VOUT OPEN nderv oltage Lockout UVLO Threshold VUVLO falli Output Resi stance Leakage urrent (OFF) Temperature Protection Level Hysteresi THYST rFLG IFLG IFLG 10mA, VFLG 5.0V, ITH(CL) VOUT 0.60 0.85 1.10 td(OFF) ROUT 10W, ROUT 10W, ROUT 10W, mbol onditions
PRELIMINARY
Unless specified: 25°C, VSHDN GND, IOUT 500mA. Values bold apply over full operating temperature range.
nits
Note: Timing Diagram page
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Timing Diagram
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Configuration
View
Ordering Information
ice(1) 2041IS.TR ackag SO-8
Note: Only available tape reel packaging. reel contains 2500 devices. (8-Pin SOIC)
Block Diagram
Descriptions
Function Ground. Input voltage: drai N-channel power MOSFET. onnect supply voltage. Shutdown nput: compati ble. N-channel power MOSFET turned when pulled low. Error flag output: asserted acti duri fault condi (overcurrent, nput undervoltage thermal shutdown). Power output: source N-channel power MOSFET. onnect load.
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2001 Semtech Corp.
SC2041
POWER MANAGEMENT Typical Characteristics
On-State Quiescent Current Junction Temperature Input Voltage
5.0V 3.3V IQ(ON) (µA) (°C)
On-State Quiescent Current Input Voltage
IQ(ON) (µA) 25°C IOUT 500mA VSHDN
3.0V
IOUT 500mA VSHDN
Off-State Quiescent Current Input Voltage Junction Temperature
IQ(OFF) (nA) VSHDN 25°C -40°C 125°C
Power Switch Resistance Junction Temperature Input Voltage
VSHDN IOUT 500mA
bottom: 3.0V 3.3V 5.0V
(°C)
Power Switch Resistance Input Voltage Junction Temperature
-40°C 25°C (ms) VSHDN IOUT 500mA 125°C
Output Turn-On Rise Time Input Voltage Junction Temperature
125°C
25°C
-40°C
COUT ROUT (VIN 2.8V 3.3V) ROUT (VIN 5.5V)
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Characteristics (Cont.)
Short Circuit Current Limit Input Voltage Junction Temperature
0.95 VSHDN VOUT 0.90 0.85 0.80 bottom: -40°C 25°C 125°C 0.80 0.75 0.70 0.65 0.60 3.3V 0.75 0.70 0.65 VSHDN VOUT 0.60 (°C) 3.0V 0.85 5.0V 0.90
Short Circuit Current Limit Junction Temperature Input Voltage
Current Limit Trip Threshold Junction Temperature Input Voltage
5.0V
VTH(SHDN) 2.00 1.75 1.50 1.25 1.00 0.75 0.50
Shutdown Threshold Input Voltage Junction Temperature
ITH(CL) 3.3V VSHDN VOUT (°C)
bottom: -40°C 25°C 125°C
3.0V
0.25 0.00
Error Flag Output Resistance Input Voltage Junction Temperature
rFLG IFLG 10mA VOUT Switch bottom: 125°C 25°C -40°C
Undervoltage Lockout Junction Temperature
2.80 rising 2.75 2.70 VUVLO 2.65 2.60 2.55 2.50 falling 2.45 2.40 (°C)
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Characteristics (Cont.)
Figure Output Turn Delay Rise Time with 0.1µF Output Capacitor Load Figure Output Turn Delay Rise Time with Output Capacitor Load
Trace: VSHDN, 5V/div. Bottom Trace: VOUT, 2V/div. Timebase: 1ms/div. ROUT open, COUT 0.1µF
Trace: VSHDN, 5V/div. Bottom Trace: VOUT, 2V/div. Timebase: 1ms/div. ROUT 10W, COUT
Figure Output Turn Delay Fall Time with Output Capacitor Load
Figure Current Limit Trip Threshold with Ramped Load Enabled Device
Trace: VSHDN, 5V/div. Bottom Trace: VOUT, 2V/div. Timebase: 10µs/div. ROUT 10W, COUT
Trace: VOUT, 5V/div. Bottom Trace: IOUT, 0.5A/div. Timebase: 100ms/div. ROUT ramping from open 1.1W, COUT 22µF
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Characteristics (Cont.)
Figure Current Limit Trip Threshold with Ramped Load Enabled Device Figure Short Circuit Current, Device Enabled Into Short
Trace: VFLG, 5V/div. Bottom Trace: IOUT, 0.5A/div. Timebase: 100ms/div. ROUT ramping from open 1.1W, COUT 22µF
Trace: VSHDN, 5V/div. Bottom Trace: IOUT, 0.2A/div. Timebase: 1ms/div. ROUT
Figure Short Circuit Current, Short Applied Enabled Device
Figure Current Limit, 1.1W Load Applied Enabled Device
Trace: VFLG, 5V/div. Bottom Trace: IOUT, 5A/div. Timebase: 250µs/div. ROUT COUT 22µF Note initial output current spike from output capacitor discharge.
2001 Semtech Corp.
Trace: VFLG, 5V/div. Bottom Trace: IOUT, 1A/div. Timebase: 250µs/div. ROUT 1.1W, COUT
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SC2041
POWER MANAGEMENT Typical Characteristics (Cont.)
Figure Inrush Current, Device Enabled Into 100µF Figure Inrush Current, Device Enabled Into 470µF
Trace: VSHDN, 5V/div. Bottom Trace: IOUT, 0.2A/div. Timebase: 2.5ms/div. ROUT 10W, COUT 100µF
Trace: VSHDN, 5V/div. Bottom Trace: IOUT, 0.2A/div. Timebase: 2.5ms/div. ROUT 10W, COUT 470µF output current altogether, also cause Flag asserted low. Once junction temperature dropped 20°C (typical), device will start once more controlled manner. SC2041 will operate from supply voltages 2.8V, internal undervoltage lockout circuitry ensures that power switch will turned power-up, even device enabled. Once UVLO threshold voltage (2.7V typical) reached, switch will turn enabled) slowly ramp output. SC2041 been designed applications such hosts self-powered hubs that need current limit downstream ports report overcurrent conditions; powered hubs that need able switch power downstream ports, limit inrush currents power-up less than resistor parallel with 10µF capacitor) power-up draw less than 100mA; powered functions that need limit inrush currents power-up less than resistor parallel with 10µF capacitor) power-up draw less than 100mA.
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Applications Information
Theory Operation SC2041 current limited 80mW power switch with error reporting enable features. power switch N-channel MOSFET with gate driven internal charge pump. switch been designed turn slowly (1.7ms typical) minimize inrush currents turn-on. Shutdown (SHDN) compatible with logic, when pulled high, shuts power switch. This causes device enter very power shutdown mode, where will draw less than from supply. While enabled, SC2041 draws only 100µA from supply. power switch current limit detection circuitry which will limit current through switch 0.85A (typical) reduce output voltage accordingly. When current limit entered, open drain Flag (FLG) asserted low, indicating fault condition. overcurrent short condition continuous, power dissipation switch will cause junction temperature rise, triggering thermal protection circuitry shut switch down 150°C typical). This will shut
2001 Semtech Corp.
SC2041
POWER MANAGEMENT Applications Information (Cont.)
VBUS Shutdown Signal From Controller SHDN SC2041 VBUS
Flag Output Controller 0.1uF 0.1uF 22uF
Component Selection General 0.1µF greater ceramic bypass capacitor recommended device input. This should placed close input (IN) routed directly ground. electrolytic capacitor recommended output, higher values should used heavy loads reduce ringing output (and hence input). Bypass output with 0.1µF ceramic capacitor improve immunity short circuit transients. Shutdown shutdown (SHDN) input active-low, compatible enable/disable. Pulling this high shuts down power switch SC2041 will draw from supply. Pulling this will enable device. Error Flag error flag (FLG) output open drain N-channel MOSFET. output pulled during overcurrent, input undervoltage thermal shutdown conditions. Connection high capacitance loads output cause momentary overcurrent conditions inrush current trigger false error flag assertion. This reduced using output capacitors provide impedance source hot-plug events. addition filter between controller resolve this easily. This also requires pull-up resistor high signal when asserted.
2001 Semtech Corp.
Overcurrent There three overcurrent situations considered: output already short before device enabled power applied. this case, SC2041 immediately detects short, output current will slowly ramp current limit value, will assert low. Refer Figure Page short occurs while device enabled. this case, very high current flow initially while overcurrent circuitry reacts. Once current limit circuitry trips, current limited 0.85A asserted low. Refer Figure Page load gradually increases beyond 500mA. this case, current will allowed rise until reaches Current Limit Trip Threshold, which point current will drop back 0.85A will assert low. Refer Figures Pages Thermal Sensing internal thermal shutdown circuit turns power switch when temperature exceeds 150°C (typical). asserts signaling fault condition. Built-in hysteresis prevents switch from turning back until temperature cooled approximately 20°C. switch will continue cycle until fault condition removed. thermal sense circuit functions only when switch enabled.
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SC2041
POWER MANAGEMENT Applications Information (Cont.)
Undervoltage Lockout undervoltage lockout circuit monitors input voltage prevents power switch from turning until input voltage (IN) exceeds 2.7V (typical). input voltage falls drops below 2.4V (typical), undervoltage circuitry turns power switch asserts low. undervoltage lockout functions only when switch enabled. Thermal Considerations Since on-resistance power switch low, SC2041 pass large currents without requiring large package dissipate heat. worst-case power dissipation (under normal operating conditions) given
Inserting 85°C, 130°C/W (package thermal impedance minimum line widths internal power planes) D(MAX) 37.5mW, calculate worst-case
Thus seen that this device does require additional copper area heatsinking under normal operating conditions. Sustained overcurrents short circuits will rapidly heat 150°C, thus activating thermal shutdown circuitry. Layout Considerations ceramic bypass capacitors should connected close relevant device pins possible. bulk output capacitors required specification should placed close connector provide impedance source plug purposes. Ferrite beads should placed VBUS Ground pins downstream connectors reduce droop adjacent ports during plug events.
IOUT 500mA rON(MAX) 150mW 3.3V), maximum power dissipation
junction temperature calculated using following equation:
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Applications Circuits
Self-Powered Hub, Individual Port Power Management self-powered must supply continuous 500mA current each downstream port. Since internal power supply used supply power, self-powered hubs required implement overcurrent protection safety. self-powered must also have method detect report fault conditions controller. circuit Figure below utilizes SC2041 provide individual port overcurrent protection power switching maximum port protection. Under fault conditions, SC2041 provides short-circuit current limiting function fault flag
Power Supply 100k VBUS Upstream Port 4.7uF SC5205-3.3 10nF 4.7uF D1D+ D1DUSB Controller SRDA05-4 D0D+ D0DI/O3 REF2 I/O4 REF2 0.1uF I/O1 REF1 I/O2 REF1 SHDN SC2041 33uF Ferrite Bead Ferrite Bead VBUS DGND Downstream Port
logic output notifying controller. SC2041 remove power from faulty port, allowing other ports operate normally. Since insertion removal system, ports subject electrostatic discharge (ESD). SRDA05-4 provides protection downstream data power lines. Each device will protect ports. With proper layout port hardened greater than 15kV, meeting requirements 1000-4-2. SC5205 regulator used power controller from hubs power supply.
Figure Self-Powered Notes: port only shown simplicity. 33µF output capacitor assumes four downstream ports this hub, therefore meeting specification requirement 120µF minimum capacitance hub. SRDA05-4 shown would also protect lines D2D+ D2D-.
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Applications Circuits (Cont.)
Powered Hub, Ganged-Port Power Management bus-powered distributes power data from input port downstream ports. must supply continuous 100mA current each downstream port. bus-powered must able switch power downstream ports prevent illegal device hook-up. Inrush current limiting also required prevent power supply drooping. circuit Figure below utilizes SC2041 provide ganged port power switching, inrush current limiting overcurrent protection maximum port protection. ganged switch configuration, ports switched simultaneously. Under fault conditions, controller will remove power ganged ports. individual port management, additional SC2041s used. Since insertion removal system, ports subject electrostatic discharge (ESD). SRDA05-4 provides protection downstream data power lines. Each device will protect ports. With proper layout port hardened greater than 15kV, meeting requirements 1000-4-2. upstream port, SR05 provides protection above levels line pair. SC5205 regulator used power controller from upstream bus.
100k SR05 VBUS Upstream Port 4.7uF SC5205-3.3 10nF 4.7uF D1D+ D1DD2D+ D2DD3D+ D3DD4D+ D4DUSB Controller D0D+ D0D4
SC2041 33uF Ferrite Bead Ferrite Bead VBUS DGND Downstream Port Ferrite Bead
SHDN
I/O3 REF2 I/O4 REF2 SRDA05-4 33uF 0.1uF I/O1 REF1 I/O2 REF1
VBUS
Ferrite Bead
Downstream Port
Ferrite Bead
VBUS
I/O1 REF1 I/O2 REF1 I/O3 REF2 I/O4 REF2
33uF Ferrite Bead
DGND Downstream Port
Ferrite Bead SRDA05-4 33uF Ferrite Bead
VBUS DGND Downstream Port
Figure Powered Note: 33µF output capacitor port meets specification minimum capacitance requirement 120µF hub.
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Typical Applications Circuits (Cont.)
High-Power Low-Power Bus-Powered Function Both low-power high-power bus-powered functions must draw less than 100mA startup. this time, they must also present load less than parallel combination resistor 10µF capacitor. After startup, high powered functions then draw 500mA. circuit figure below utilizes SC2041 provide inrush current limiting power switching internal function. Since insertion removal system, ports subject electrostatic discharge (ESD). SR05 provides protection upstream data power lines. With proper layout port hardened greater than 15kV, meeting requirements 1000-4-2. SC5205 regulator used power controller from upstream bus.
100k SR05 VBUS Upstream Port 10uF SC5205-3.3 10nF 4.7uF Controller D0D+ D0D4
SC2041 10uF Internal Function
SHDN
0.1uF
Figure High-Power Low-Power Bus-Powered Function
2001 Semtech Corp.
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SC2041
POWER MANAGEMENT Outline Drawing SO-8
JEDEC REF: MS-012AA
Land Pattern SO-8
Contact Information
Semtech Corporation Power Management Products Division Mitchell Rd., Newbury Park, 91320 Phone: (805)498-2111 (805)498-3804
2001 Semtech Corp.
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HotSwitch Power Distribution Switch With Shutdown Designed meet s

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