HotSwitch Dual Power Distribution Switch With Enable Designed mee

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HotSwitch Dual Power Distribution Switch With Enable Designed mee

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power distribution switches high-side N-channel MOSFET switches with built-in overcurrent protection on-state resistance. SC5826 switch designed meet requirements power switching maintenance-free fault protection self-powered bus-powered applications. SC5826 features on-state resistance meet requirement voltage drop regulation. switch controlled enable input that compatible with logic. enable input available with active high (EN, SC5826-1) active (SHDN, SC5826-2) input maximum design flexibility. device provides short circuit current limiting value less than 1.5A, well below limit During overcurrent condition device provides fault notification signal controller. integrated thermal protection circuit automatically shuts switches when junction temperature reaches thermal limit. switches remain until junction temperature drops approximately 5°C. switches will continue cycle until fault removed. Inrush current limiting prevents voltage drop upstream port when switches enabled. undervoltage lockout circuit guarantees switches initially during start-up. SC5826 available popoular SO-8 surface mount package.
HotSwitch Dual Power Distribution Switch With Enable
Designed meet specification revisions
power management requirements recognized 500mA continuous load current High-side MOSFET switches 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 Full industrial temperature range SO-8 surface mount package
SC5826
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 FlagA output controller FlagB output controller Shutdown signal from Controller FLGA FLGB OUTA OUTB VBUS OUTB VBUS OUTA
SC5826-1 0.1uF 0.1uF 22uF 0.1uF 22uF
Revision February 2001
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SC5826
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Voltage Range Output Voltage Range` Enable 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 mbol VOUT IOUT TSTG Maximum -0.3 -0.3 -0.3 -0.3 (VIN 0.3) Internally +125 +150 nits
Electrical Characteristics(1)
Unless specified: 25°C, (SC5826-1), VSHDN (SC5826-2), IOUTA IOUTB 500mA. Values bold apply over full operating temperature range.
Parameter Supply Voltage Range Supply urrent
mbol
onditions
nits
3.3V
5.0V
5.5V, both outputs OFF(2) Power Switch Resi stance 3.3V
0.02
5.0V
Output Leakage urrent Output Turn elay(3) IL(OFF) td(ON) 5.5V, both outputs OFF(2), VOUT ROUT 10W,
0.02 0.25
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Electrical Characteristics(1)
Unless specified: 25°C, (SC5826-1), VSHDN (SC5826-2), IOUTA IOUTB 500mA. Values bold apply over full operating temperature range.
Parameter ont.) Output Turn me(3) Output Turn elay(3) Output Turn Fall me(3) urrent Limit Short rcui urrent urrent Threshold Level Input Voltage Level Input Voltage Input urrent nderv oltage Lockout UVLO Threshold UVLO Hysteresi Output Resi stance Leakage urrent (OFF)(2)
mbol
onditions
nits
td(OFF)
ROUT 10W, ROUT 10W, ROUT 10W,
0.55
ITH(CL)
VOUT
0.50
0.85
1.50
IEN, ISHDN
2.8V 5.5V 2.8V 5.5V 5.5V, VOUT OPEN, (VEN VSHDN)
VUVLO VHYST
falli
rFLG IFLG
IFLG 10mA, VOUT VFLG 5.0V, both outputs
Temperature Protection Level Hysteresi THYST
Notes: This device sensitive. standard handling precautions required. Both outputs when (SC5826-1) VSHDN (SC5826-2). Timing Diagrams page
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Timing Diagrams
SC5826-1
SC5826-2
2001 Semtech Corp. www.semtech.com
SC5826
POWER MANAGEMENT Configuration
View
Ordering Information
ice(1) 5826-1C S.TR 5826-2C S.TR Enable/Shutdown Enable (Acti Shutdown (Acti Low) ackag SO-8 SO-8
Note: Only available tape reel packaging. reel contains 2500 devices. SO-8 Note Configuration Block Diagram: SC5826-1 shown. SC5826-2, pins SHDNA SHDNB.
Block Diagram
Descriptions
ENA/B 5826-1) NA/B 5826-2) FLGA/B OUTA/B Function Enable nputs: compati ble. OUTA/B N-channel power MOSFETs turned when these pulled Shutdown nputs: compati ble. OUTA/B N-channel power MOSFETs turned when these pulled low. Error flag outputs: asserted acti duri fault condi (overcurrent, nput undervoltage thermal shutdown). Ground. Input voltage: drai N-channel power MOSFETs. onnect supply voltage. Power output: source N-channel power MOSFETs. onnect load.
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Typical Characteristics
On-State Quiescent Current Junction Temperature Input Voltage
3.3V IOUTA IOUTB 3.3V (°C) IQ(ON) (uA) IQ(ON)
On-State Quiescent Current Input Voltage
25°C IOUTA IOUTB 500mA
Power Switch Resistance Junction Temperature Input Voltage
IOUTA IOUTB 500mA 3.3V (°C)
Power Switch Resistance Input Voltage Junction Temperature
125°C
25°C
-40°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) (µs)
Short Circuit Current Limit Input Voltage Junction Temperature
VOUT
-40°C 125°C 25°C
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Typical Characteristics (Cont.)
Short Circuit Current Limit Junction Temperature Input Voltage
(°C) 3.3V ITH(CL) VOUT (°C) VOUT 3.3V
Current Limit Trip Threshold Junction Temperature Input Voltage
Enable/Shutdown Threshold Input Voltage
25°C VIH, rFLG
Error Flag Output Resistance Input Voltage Junction Temperature
bottom: 125°C 25°C -40°C
IFLG 10mA VOUT Switch
Undervoltage Lockout Junction Temperature
rising
VUVLO
falling
(°C)
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Typical Characteristics (Cont.)
Figure Output Turn Delay Rise Time with Output Capacitor Load Figure Output Turn Delay Fall Time with Output Capacitor Load
Trace VOUTA, 2V/div. Trace VOUTB, 2V/div. Trace VSHDNA/B, 5V/div. Timebase: 500µs/div. SC5826-2 shown.
Trace VOUTA, 2V/div. Trace VOUTB, 2V/div. Trace VSHDNA/B, 5V/div. Timebase: 100µs/div. SC5826-2 shown.
Figure Output Turn Delay Rise Time with 100µF Output Capacitor Load
Figure Output Turn Delay Fall Time with 100µF Output Capacitor Load
Trace VOUTA, 2V/div. Trace VOUTB, 2V/div. Trace VSHDNA/B, 5V/div. Timebase: 500µs/div. SC5826-2 shown.
2001 Semtech Corp.
Trace VOUTA, 2V/div. Trace VOUTB, 2V/div. Trace VSHDNA/B, 5V/div. Timebase: 500µs/div. SC5826-2 shown.
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SC5826
POWER MANAGEMENT Typical Characteristics (Cont.)
Figure Short Circuit Current, Output Enabled Into Short Figure Short Circuit Current, Short Applied Enabled Device (COUT 100µF)
Trace IOUTA/B, 0.5A/div. Trace VSHDNA/B, 5V/div. Trace VFLGA/B, 5V/div. Timebase: 100µs/div. SC5826-2 shown.
Trace IOUTA/B, 5A/div. Trace VSHDNA/B, 5V/div. Timebase: 100µs/div. Note: initial peak current supplied output capacitor. SC5826-2 shown. Figure Inrush Current, Device Enabled Into 330µF Output Capacitor Load
Figure Inrush Current, Device Enabled Into 100µF Output Capacitor Load
Trace IOUTA/B, 0.5A/div. Trace VFLGA/B, 5V/div. Trace VSHDNA/B, 5V/div. Timebase: 500µs/div. SC5826-2 shown.
2001 Semtech Corp.
Trace IOUTA/B, 0.5A/div. Trace VFLGA/B, 5V/div. Trace VSHDNA/B, 5V/div. Timebase: 500µs/div. SC5826-2 shown.
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SC5826
POWER MANAGEMENT Applications Information
Theory Operation SC5826 contains dual current limited 100mW power switches with error reporting enable features. power switches N-channel MOSFETs with their gates driven internal charge pump. switches have been designed turn slowly (0.55ms typical) minimize inrush currents turn-on. Shutdown pins (SHDNA/B SC5826-2) compatible with logic, when pulled high, shut related power switches. When both shut down, device enters very power shutdown mode, where will draw less than 10µA from supply. While enabled, SC5826 draws only 100µA from supply. SC5826-1 active high Enable pins each output (ENA/B). power switches have current limit detection circuitry which will limit current through switch 0.85A (typical) reduce output voltage accordingly. When current limit entered, open drain Flag (FLGA/B) asserted low, indicating fault condition. overcurrent short condition continuous, power dissipation switch will cause junction 2.8V, internal undervoltage lockout circuitry ensures that power switches will turned power-up, even device enabled. Once UVLO threshold voltage (2.5V typical) reached, switches will turn enabled) slowly ramp outputs. SC5826 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. Component Selection General 0.1µF greater ceramic bypass capacitor recommended device input. This should placed close input (IN) routed directly ground. electrolytic capacitor recommended each
VBUS
Shutdown signal from Controller FlagA output controller FlagB output controller Shutdown signal from Controller FLGA FLGB OUTA OUTB VBUS OUTB VBUS OUTA
SC5826-1 0.1uF 0.1uF 22uF 0.1uF 22uF
temperature rise, triggering thermal protection circuitry shut switch down 160°C typical). This will shut output current altogether, also cause Flag asserted low. Once junction temperature dropped (typical), device will start once more controlled manner. SC5826 will operate from supply voltages
2001 Semtech Corp.
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. Enable/Shutdown shutdown pins (SHDN) active-low (enable pins
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SC5826
POWER MANAGEMENT Applications Information (Cont.)
active high) compatible with logic. Pulling shutdown pins high shuts down power switches SC5826 will draw 10µA from supply. Pulling these pins will enable device. enable pins device will shutdown pulled low. Error Flags error flag (FLG) outputs open drain N-channel MOSFETs. Each 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. These pins also require pull-up resistor high signal when asserted. Overcurrent There three overcurrent situations considered: output already short before device enabled power applied. this case, SC5826 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 (typ.) 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. Thermal Sensing internal thermal shutdown circuit turns power switch when temperature exceeds 160°C (typical). asserts signaling fault condition. Built-in hysteresis prevents switch from turning back until temperature cooled approximately 5°C. switch will continue cycle
2001 Semtech Corp.
until fault condition removed. thermal sense circuit functions only when switches enabled. Undervoltage Lockout undervoltage lockout circuit monitors input voltage prevents power switches from turning until input voltage (IN) exceeds 2.5V (typical). input voltage falls drops below 2.375V (typical), undervoltage circuitry turns power switches pins assert low. undervoltage lockout functions only when switches enabled. Thermal Considerations Since on-resistance power switch low, SC5826 pass large currents without requiring large package dissipate heat. worst-case power dissipation (under normal operating conditions) given
PD(MAX (IOUTA rONA (MAX (IOUTB rONB(MAX
IOUTA IOUTB 500mA rON(MAX) 200mW 3.3V), maximum power dissipation
PD(MAX (0.5)2 100mW
junction temperature calculated using following equation:
Inserting 85°C, 163°C/W (package thermal impedance minimum line widths internal power planes) D(MAX) 100mW, calculate worst-case
101°C
Thus seen that this device does require additional copper area heatsinking under normal operating conditions. Sustained overcurrents short circuits will rapidly heat 160°C, thus activating thermal shutdown circuitry.
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SC5826
POWER MANAGEMENT Applications Information (Cont.)
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.
2001 Semtech Corp.
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SC5826
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 SC5826 provide individual port overcurrent protection power switching maximum port protection. Under fault conditions, SC5826 provides short-circuit current limiting function fault flag logic output notifying controller. SC5826 remove power from faulty port, allowing other ports operate normally. Each SC5826 control power ports. 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.
Power Supply 100k 100k FLGA FLGB SC5826-1 OUTA OUTB Ferrite Bead I/O1 REF1 VBUS Upstream Port 4.7uF SC5205-3.3 10nF 4.7uF D1D+ D1DD2D+ D2DUSB Controller Ferrite Bead VBUS 33uF Ferrite Bead DGND Downstream Port SRDA05-4 D0D+ D0DI/O3 REF2 I/O4 REF2 I/O2 REF1 33uF Ferrite Bead VBUS DGND Downstream Port 0.1uF
Figure Self-Powered Notes: ports only shown simplicity. 33µF output capacitor assumes four downstream ports this hub, therefore meeting specification requirement 120µF minimum capacitance hub.
2001 Semtech Corp.
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SC5826
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 SC5826 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
100k SR05 VBUS Upstream Port 4.7uF SC5205-3.3 10nF 4.7uF D1D+ D1DD2D+ D2DD3D+ D3DD4D+ D4DUSB Controller I/O1 REF1 I/O2 REF1 I/O3 REF2 I/O4 REF2 Ferrite Bead SRDA05-4 33uF Ferrite Bead VBUS DGND Downstream Port 33uF Ferrite Bead Ferrite Bead VBUS DGND Downstream Port SRDA05-4 D0D+ D0D4 I/O1 REF1 I/O2 REF1 I/O3 REF2 I/O4 REF2 33uF Ferrite Bead Ferrite Bead VBUS DGND Downstream Port FLGA FLGB OUTA OUTB 0.1uF Ferrite Bead VBUS 33uF Ferrite Bead DGND Downstream Port
power ganged ports. individual port management, extra SC5826 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.
SC5826-1
Figure Powered Note: 33µF output capacitor port meets specification minimum capacitance requirement 120µF hub.
2001 Semtech Corp.
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SC5826
POWER MANAGEMENT Typical Applications Circuits (Cont.)
High-Power Low-Power Bus-Powered Functions 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 SC5826 provide inrush current limiting power switching internal functions. 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
100k
FLGA FLGB OUTA OUTB 0.1uF 10uF Internal Function
SC5826 10uF Internal Function
Figure High-Power Low-Power Bus-Powered Functions
2001 Semtech Corp.
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SC5826
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 Dual Power Distribution Switch With Enable Designed mee

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