Adjustable Current Limit Power Distribution Switch MIC2007 MIC201

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Adjustable Current Limit Power Distribution Switch MIC2007 MIC201

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MIC2007/2017
Adjustable Current Limit Power Distribution Switch
MIC2007 MIC2017 current limiting, highside power switches, designed general purpose power distribution control PCs, PDAs, printers other self-powered systems. MIC2007 MIC2017's primary functions current limiting power switching. They thermally protected will shutdown should their internal temperature reach unsafe levels. This protects both device load under high current fault conditions. Features include: user adjustable output slew rate limiting, automatic load discharge under voltage detection. Both devices offer user programmable current limiting thereby providing designers continuous spectrum current limits from 200mA Amps. MIC2017 offers unique feature: KickstartTM, which allows momentary high current surges pass unrestricted without sacrificing overall system safety. MIC2007 MIC2017 excellent choices IEEE 1394 (FireWire) applications system where current limiting power control desired. MIC2007 MIC2017 offered space saving 6-pin SOT-23 MLFpackages.
Features
typical on-resistance 2.5V 5.5V operating range User adjustable current limit: 0.2A 2.0A KickstartUser adjustable output slew rate control Automatic load discharge Thermal protection Under voltage lock-out quiescent current
Applications
IEEE 1394 power distribution Desktop laptop boxes Game consoles PDAs Printers Docking stations Chargers
Typical Application
MIC2007 MIC2017 Supply CSLEW Controller ENABLE VOUT ILIMIT VBUS
D+/D-
Port
D+/D-
Port
Figure Typical Application Circuit
Kickstart trademark Micrel, MicroLeadFrame trademarks Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive Jose, 95131 (408) 944-0800 (408) 474-1000 http://www.micrel.com
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
MIC2000 Family Members
Part Number Normal Limiting 2003 2004 2005 2006 2007 2008 2009 Kickstart 2013 2014 2015 2016 2017 2018 2019 Adj. Fixed Limit Adj. Enable Function CSLEW -FAULT/ DLM* -Load Discharge
Dynamic Load Management
Adjustable current limit
Fixed Factory programmed current limit
Ordering Information
Part Number MIC2007YM6 Marking(1) FHAA MIC2007YML
Current Limit
Kickstart
Pb-Free
Package
SOT-23-6
0.2A 2.0A
MIC2017YM6
FQAA
SOT-23-6
MIC2017YML(2)
Notes:
Under-bar symbol scale. Consult Factory availability
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Configuration
VOUT CSLEW ILIMIT
BACKSIDE GROUND
ENABLE
ENABLE
VOUT CSLEW ILIMIT
6-Pin (ML) View
23-6 (M6)
View
Description
Number SOT-23 Number Name ENABLE LIMIT Type Description
Input -Input Input
Supply input. This provides power both output switch MIC2007/2017's internal control circuitry. Ground. Output enable pin. logic HIGH activates output switch, applying power load attached VOUT. Sets current limit threshold resistor connected between ILIMIT GND. LIMIT Current Limiting Factor (CLF) RSET. Slew rate control. Adding small value capacitor between this slows turn-ON power FET. Switch output. load being driven MIC2007/2017 connected this pin.
CSLEW VOUT
Input Output
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Absolute Maximum Ratings(1)
pins .-0.3 Power Dissipation.Internally Limited Continuous Output Current. 2.25A Maximum Junction Temperature 150°C Storage Temperature -65°C 150°C
Operating Ratings(2)
Supply Voltage. 2.5V 5.5V Continuous Output Current Range 2.1A Ambient Temperature Range -40°C 85°C Package Thermal Resistance (JA) SOT-23-6 .230°C/W mm.90°C/W .45°C/W
Electrical Characteristics
TAMBIENT 25°C unless specified otherwise. Bold indicates -40°C +85°C limits. Symbol
ILEAK RDS(ON) RDSCHG
Parameter
Switch Input Voltage Internal Supply Current Internal Supply Current Output Leakage Current Power Switch Resistance Load Discharge Resistance Current Limit: Factor RSET IOUT
Conditions
Switch OFF, ENABLE Switch IOUT ENABLE 1.5V VOUT ENABLE IOUT ISINK IOUT 2.0A, VOUT 0.8VIN IOUT 1.0A, VOUT 0.8VIN IOUT 0.5A, VOUT 0.8VIN IOUT 0.2A, VOUT 0.8VIN MIC2017, 2.5V rising falling VIL(max.) VIH(min.)
Units
2.25 2.15
ILIMIT_2nd UVLOTHRESHOLD OTTHRESHOLD
Secondary current limit (Kickstart) Under Voltage Lock threshold ENABLE Input Voltage ENABLE Input Current Over-temperature Threshold
5.0V increasing decreasing
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Characteristics
Symbol tRISE tD_LIMIT tRESET Parameter Output turn-ON rise time Delay before current limiting Delay before resetting Kickstart current limit delay, tD_LIMIT Output Turn-on Delay Condition CLOAD 1µF, VOUT MIC2017 current limit following current limit event. MIC2017 120µF, CSLEW 10pF, VOUT tOFF_DLY Output Turn-off Delay 120µF, CSLEW 10pF, VOUT 1000 1500 1000 1500 Units
tON_DLY
Symbol VESD_HB VESD_MCHN Parameter Electrostatic Discharge Voltage: Human Body Model Electrostatic Discharge Voltage: Machine Model Condition VOUT other pins pins Machine Model Units
Notes: Exceeding absolute maximum rating damage device. device guaranteed function outside operating rating. Devices sensitive. Handling precautions recommended. Human body model: 1.5k series with 100pF. Specification packaged product only. Requires proper thermal mounting achieve this performance.
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Timing Diagrams
ENABLE
tON_DLY
tOFF_DLY
VOUT
Switching Delay Times
tRISE
tFALL
Rise Fall Times
tRISE
VOUT
Output Rise Time
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Typical Characteristics
SUPPLY CURRENT (µA)
Supply Current Output Enabled
25°C -40°C 85°C
1.00 0.90 SUPPLY CURRENT (µA) 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10
Supply Current Output Disabled
Switch Leakage Current
1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 TEMPERATURE (°C)
-40°C 25°C 85°C
(µA)
2.25 THRESHOLD
UVLO Threshold Temperature
RISING (mOhm)
(mOhm)
Supply Voltage
Temperature
3.3V 2.5V
2.15
FALLING
2.05
TEMPERATURE (°C)
TEMPERATURE (°C)
CURRENT LIMIT FACTOR
Current Limit Factor Temperature 2.5V
CURRENT LIMIT FACTOR
85°C -40°C 25°C
Current Limit Factor Temperature
25°C 85°C -40°C CURRENT LIMIT FACTOR CURRENT LIMIT
Current Limit Factor Temperature
25°C 85°C -40°C
CURRENT LIMIT
CURRENT LIMIT
CURRENT LIMIT FACTOR
Current Limit Factor Input Voltage -40°C
CURRENT LIMIT FACTOR
Current Limit Factor Input Voltage 25°C
Current Limit Factor Input Voltage 85°C
CURRENT LIMIT FACTOR CURRENT LIMIT
2.5V
2.5V
2.5V
Note: 2.5V plots overlap.
CURRENT LIMIT
CURRENT LIMIT
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Functional Characteristics
Turn-On/Turn-Off
Inrush Current Response Inrush Current Inrush Current Inrush CurrentResponse Response Inrush Current Response MIC20xx-0.5
CSLEW
ENABLE (2.5V/div)
ENABLE (2.5V/div)
5.0V RLOAD CLOAD 100µF VOUT (1V/div)
VOUT (1V/div) 10µF 22µF47µF 100µF
220µF
470µF
IOUT (200mA/div) Time (ms)
IOUT (200mA/div) Time (ms)
Current Limit Response Thermal Shutdown
ENABLE (2.5V/div)
CSLEW Response
ENABLE (2.5V/div)
5.0V RLOAD CLOAD 47µF VOUT (1V/div)
100pF
820pF
1800pF
2700pF 3500pF
VOUT (1V/div)
IOUT (250mA/div) Time (ms)
IOUT (150mA/div) 2000 6000 10000 14000 Time (µs)
5.0V RLOAD CLOAD 18000 22000
UVLO Increasing
UVLO Decreasing
ENABLE (2.5V/div)
ENABLE (2.5V/div)
VOUT (1V/div)
VOUT (1V/div)
(1/div)
Enable tied Time (µs)
(1/div)
Enable tied
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Kickstart Response Normal Load with Temporary High Load
Kickstart Response Load Short Circuit
ENABLE (2.5V/div)
ENABLE (1V/div)
VOUT (1V/div)
VOUT (1V/div)
IOUT (0.5A/div) Time (ms)
IOUT (0.5A/div) Time (ms)
Kickstart Response Normal Load with Temporary Short Circuit
Kickstart Response Device Enabled into Short Circuit
ENABLE (2.5V/div)
ENABLE (2.5V/div)
VOUT (1V/div)
VOUT (1V/div)
IOUT (0.5A/div) Time (ms)
IOUT (0.5A/div) Time (ms)
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Functional Diagram
Under Voltag Detector
Current Mirror
Power
ENABLE
Control Logic Delay Timer
Gate Control
VOUT
Thermal Sensor
CSLEW ILIMIT
Slew Rate Control
VREF Current Limit Control Loop
Figure MIC2007/2017 Block Diagram
October 2005
M9999-102805
Micrel
MIC2007/MIC2017 limit duration Kickstart period. After this time, MIC2017 reverts normal current limit. example Kickstart operation shown below.
Functional Description
Input Output both power supply connection internal circuitry driving switch input (Source connection) power MOSFET switch. VOUT Drain connection power MOSFET supplies power load. typical circuit, current flows from VOUT toward load. Since switch bidirectional when enabled, VOUT greater than VIN, current will flow from VOUT VIN. When switch disabled, current will flow load, except small unavoidable leakage current microamps. However, should VOUT exceed more than diode drop (~0.6V), while switch disabled, current will flow from output input power MOSFET's body diode. While this effect used advantage when large bypass capacitors placed MIC2007/2017's's output, relied upon fully reliably discharge load capacitance, because discharging depends upon characteristics circuitry VIN. ensure proper discharge output capacitance, MIC2007/2017 equipped with discharge which time device Enabled. Current Sensing Limiting MIC2007/2017 protects system power supply load from damage continuously monitoring current through on-chip power MOSFET. Load current monitored, means current mirror, parallel with power MOSFET switch. Current limiting invoked when load exceeds externally over-current threshold. When current limiting activated output current constrained limit value, remains this level until either load/fault removed, load's current requirement drops below limiting value, MIC2007/2017 goes into thermal shutdown. Kickstart (MIC2017 only) MIC2017 designed allow momentary current surges (Kickstart) before onset current limiting, which permits dynamic loads, such small disk drives portable printers draw energy needed overcome inertial loads without sacrificing system safety. this respect, MIC2017 differs markedly from MIC2007 peers, which immediately limit load current, potentially starving motor causing appliance stall stutter. During this delay period, typically secondary current limit effect. load demands current excess secondary limit, MIC2017 acts immediately restrict output current secondary October 2005
Figure Kickstart Operation Picture Key: MIC2017 enabled into excessive load (slew rate limiting visible this time scale) initial current surge limited either overall circuit resistance power supply compliance, secondary current limit, whichever less. power increases internal heating (effect exaggerated emphasis). Kickstart period. Current limiting initiated. FAULT/ goes LOW. (Note: MIC2007/2017 does provide FAULT/ output.) VOUT non-zero (load heavy, dead short where VOUT Limiting response will same dead shorts). Thermal shutdown followed thermal cycling. Excessive load released, normal load remains. MIC2017 drops current limiting. FAULT/ delay period followed FAULT/ going HIGH. (Note: MIC2007/2017 does provide FAULT/ output.) Under Voltage Lock Under voltage lock-out insures anomalous operation occurs before device's minimum input voltage 2.5V been achieved. Prior reaching this voltage, output switch (power MOSFET) circuit functions, such ENABLE, considered valid operative.
M9999-102805
Micrel Enable ENABLE HIGH true control signal, which activates main MOSFET switch. ENABLE will operate with logic running from supply voltages 1.8V, once exceeded UVLO threshold. ENABLE wire-OR'd with other MIC2007/2017s similar devices without damage device. ENABLE driven higher than VIN, higher than 5.5V. Slew Rate Control Large capacitive loads create significant current surges when charged through high-side switch such MIC2007/2017. this reason, MIC2007/2017 provides built-in slew rate control limit initial inrush currents upon enabling power MOSFET switch. Slew rate control active upon powering upon re-enabling load. shutdown, discharge slew rate controlled external load output capacitor. MIC2007/2017 slew rate adjustable
MIC2007/MIC2017 further reduced adding external capacitance between CSLEW pins. Thermal Shutdown Thermal shutdown employed protect MIC2007/2017 from damage should temperature exceed safe operating levels. Thermal shutdown shuts output MOSFET temperature reaches 145°C. MIC2007/2017 will automatically resume operation when temperature cools down 135°C. resumed operation results reheating die, then another shutdown cycle will occur MIC2007/2017 will continue cycling between states until offending load been removed. Depending upon layout, package type, ambient temperature, etc., hundreds milliseconds elapse from incidence fault output MOSFET being shut off. This delay thermal time constants within system itself. event will device damaged thermal overload because temperature monitored continuously on-chip circuitry.
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Application Information
Setting ILIMIT MIC2007/2017's current limit user programmable controlled resistor connected between ILIMIT Ground. value this resistor determined following equation: ILIMIT Current Limit Factor (CLF) RSET RSET Current Limit Factor ILIMIT
Giving maximum ILIMIT variation over temperature ILIMIT_MIN ILIMIT_TYP ILIMIT_MAX 1.12A 1.25A 1.39A 1.25A ±11% ILIMIT IOUT measured MIC2007/2017's current limiting circuitry designed constant current source load. load tries pull more than allotted current, VOUT drops input output voltage differential increases. When -VOUT exceeds IOUT drops below ILIMIT reduce drain fault current system's power supply limit internal heating MIC2007/2017. When measuring IOUT important bear this voltage dependence mind. Otherwise, measurement data appear indicate problem when none really exists. This voltage dependence illustrated Figures Figure output current measured VOUT pulled below VIN, with test terminating when VOUT below VIN. Observe that once ILIMIT reached IOUT remains constant throughout remainder test. Figure this test repeated with VOUT exceeding When VOUT MIC2007/2017's current limiting circuitry responds decreasing IOUT, seen Figure this demonstration, VOUT being controlled IOUT measured quantity. real life applications, VOUT determined accordance with Ohm's load limiting current.
Example:
ILIMIT 1.25A
Looking Electrical specifications will find ILIMIT sake this example, will typical value IOUT 235V. Applying equation above: RSET 1.25 RSET Designers should aware that variations measured ILIMIT given RSET resistor, will occur because small differences between individual (inherent silicon processing) resulting spread ILIMIT values. example above used typical value calculate RSET. determine ILIMIT's spread using minimum maximum values calculated value RSET. RSET
(the closest standard value)
ILIMIT_MIN 210V 1.12A
ILIMIT_MIN 260V 1.39A October 2005
M9999-102805
Micrel
MIC2007/MIC2017
NORMALIZED OUTPUT CURRENT
Normalized Output Current Output Voltage (5V)
OUTPUT VOLTAGE
Figure Figure IOUT Current Limiting VOUT
NORMALIZED OUTPUT CURRENT OUTPUT VOLTAGE
Normalized Output Current Output Voltage (2.5V)
Figure CSLEW CSLEW input provided increase control output voltage ramp turn-on. This input allows designers option decreasing output's slew rate (slowing voltage rise) adding external capacitance between pin, CSLEW, VIN. This capacitance slows rate which pass gate voltage increases thus, slows both response Enable command well VOUT's ascent final value. Figure illustrates effect CSLEW turn-ON delay output rise time.
Figure IOUT Current Limiting VOUT This folding back ILIMIT generalized plotting ILIMIT function VOUT, shown below. slope VOUT between IOUT IOUT ILIMIT (where ILIMIT determined MIC2007/2017 ILIMIT.
October 2005
M9999-102805
Micrel
Typical Turn-on Times External Capacitance
0.014 0.012 0.01 TIME (mS) 0.008
FAULT/
MIC2007/MIC2017 Kickstart over-ridden thermal protection circuit sufficient internal heating occurs, Kickstart will terminated IOUT Upon cooling, ILIMIT, IKICKSTART. load still present IOUT
SLEW
TDELAY
0.006 0.004 0.002 TRISE
ENABLE
CSLEW (nF)
VOUT
Figure CSLEW's effect ILIMIT unavoidable consequence adding CSLEW capacitance reduction MIC2008/2018's ability quickly limit current transients surges. sufficiently large capacitance prevent both primary secondary current limits from acting time prevent damage MIC2008/2018 system from short circuit fault. this reason, upper limit value CSLEW 4nF. Kickstart (MIC2017) Kickstart allows brief current surges pass load before onset normal current limiting. This, turn, permits dynamic loads draw bursts energy without sacrificing system safety. Functionally, Kickstart forced override normal current limiting function provided MIC2017. Kickstart period governed internal timer which allows current pass unimpeded load 128ms then normal (primary) current limiting goes into action. During Kickstart secondary current limiting circuit monitoring output current prevent damage MIC2017. This because hard short, combined with robust power supply, result currents many tens amperes. This secondary current limit nominally Amps reacts immediately independently Kickstart period. Once Kickstart timer finished count, primary current limiting circuit takes over holds IOUT programmed limit long excessive load persists. Once MIC2017 drops current limiting Kickstart timer initiates lock-out period 128ms such that further bursts current above primary current limit, will allowed until lock-out period expired. October 2005
Kickstart Current Limiting
IOUT
Load Removed
Time (ms)
Figure Kickstart Operation with Varying Load Supply Filtering 0.1µF bypass capacitor positioned close pins MIC2007/2017 both good design practice required proper operation MIC2007/2017. This will control supply transients ringing. Without bypass capacitor, large current surges output short cause sufficient ringing (from supply lead inductance) cause erratic operation MIC2007/2017's control circuitry. Good quality, capacitors, such Panasonic's series, suggested. When bypassing with capacitors 10µF good practice place smaller value capacitor parallel with larger handle high frequency components line transients. Values range 0.01µF 0.1µF recommended. Again, good quality, capacitors should chosen. Power Dissipation Power dissipation depends several factors such load, layout, ambient temperature, supply voltage. Calculation power dissipation accomplished following equation:
DS(ON) (IOUT relate this junction temperature, following
M9999-102805
Micrel equation used:
MIC2007/MIC2017
performance higher current levels, higher temperature environments, thermal contact with exposed power paddle back side package should made. This significantly reduces package's thermal resistance thereby extending MIC2007/2017's operating range. should noted that this backside paddle electrically active connected MIC2007/2017's pin.
Where: junction temperature, ambient temperature R(J-A) thermal resistance package normal operation, MIC2007/2017's enough that significant heating occurs. Device heating most often caused short circuit very heavy load when significant portion input supply voltage appears across MIC2007/2017's power MOSFET. Under these conditions, heat generated will exceed package PCB's ability cool device thermal limiting will invoked. Figure temperature plotted against IOUT assuming constant case temperature 85°C. plots also assume worst case temperature 135°C. Under these conditions, clear that SOT-23 packaged device will verge thermal shutdown (typically 145°C temperature) when operating load current 1.25A. this reason, recommend that package used MIC2007/2017 designs intending supply continuous currents more.
Vias diam. Ground Plane
Temperature Iout Tcase 85°C
Temperature
0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Iout Amps
SOT-23
Figure Thermal Mounting
Figure Temperature Package
Figure assumes backside contact made thermal provided package. optimal
October 2005
M9999-102805
Micrel
MIC2007/MIC2017
Package Information
6-Pin SOT-23 (M6)
6-Pin (ML)
MICREL, INC. 2180 FORTUNE DRIVE JOSE, 95131
(408) 944-0800 (408) 474-1000 http:/www.micrel.com
information furnished Micrel this data sheet believed accurate reliable. However, responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale.
October 2005
M9999-102805
2005 Micrel, Incorporated.

Adjustable Current Limit Power Distribution Switch MIC2007 MIC201

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