Fixed Current Limit Power Distribution Switch MIC2004 MIC2014 cur
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MIC2004/2014
Fixed Current Limit Power Distribution Switch
MIC2004 MIC2014 current limiting, high-side power switches, designed general purpose power distribution control PCs, PDAs, printers other self-powered systems. MIC2004 MIC2014's primary functions current limiting power switching. They thermally protected will shutdown should their internal temperature reach unsafe levels, protecting both device load, under high current fault conditions. MIC2004/2014 feature load discharge which ensures output capacitance discharged when switch turned off. This particularly useful hot-swapping applications where `cold' connections desired. Both devices fully self-contained, with current limit value being factory several convenient levels. MIC2014 offers unique feature: KickstartTM, which allows momentary high current surges pass unrestricted without sacrificing overall system safety. MIC2004 MIC2014 excellent choices IEEE 1394 (FireWire) applications system where current limiting power control desired. MIC2004 MIC2014 offered space saving SOT-23 packages. Data sheets support documentation found Micrel's site www.micrel.com.
Features
typical on-resistance 2.5V 5.5V operating range Pre-set current limit values; 0.5A, 0.8A 1.2A Load discharge KickstartThermal Protection Under voltage lock-out quiescent current
Applications
IEEE 1394 Power Distribution Desktop Laptop boxes Game consoles PDAs Printers Docking stations Chargers
Typical Application
Supply MIC2004 MIC2014 VOUT VBUS
D+/D-
Port
ENABLE Controller
VBUS
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
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
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 MIC2004-0.5YM5 MIC2004-0.8YM5 MIC2004-1.2YM5 MIC2004-0.5YML(2) MIC2004-0.8YML(2) MIC2004-1.2YML
Marking(1) FE05 FE08 FE12 FM05 FM08 FM12
Current Limit 0.5A 0.8A 1.2A 0.5A 0.8A 1.2A 0.5A 0.8A 1.2A 0.5A 0.8A 1.2A
Kickstart
Pb-Free
Package
SOT-23-5
2mmX2mm
MIC2014-0.5YM5 MIC2014-0.8YM5 MIC2014-1.2YM5 MIC2014-0.5YML MIC2014-1.2YML
Note:
SOT-23-5
2mmX2mm
MIC2014-0.8YML(2)
Under-bar symbol scale Contact factory availability.
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Configuration
VOUT
BACKSIDE
ENABLE
ENABLE
23-5 (M5) View
VOUT
6-Lead 2mmX2mm (ML) View
Description
Number SOT-23
Number
Name
ENABLE VOUT
Type
Description
Input -Input -Output
Supply input. This provides power both output switch MIC2004/2014's internal control circuitry. Ground. Output enable pin. logic HIGH activates output switch, applying power load attached VOUT. internal connection. electrical signal this will have effect device operation. internal connection. electrical signal this will have effect device operation. Switch output. load being driven MIC2004/2014 connected this pin.
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Absolute Maximum Ratings(1)
VIN, VOUT -0.3 other pins -0.3 5.5V 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-23-5 230°C/W 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 ILIMIT ILIMIT ILIMIT ILIMIT_2nd UVLOTHRESHOLD OTTHRESHOLD
Parameter
Switch Input Voltage Internal Supply Current Internal Supply Current Output Leakage Current Power Switch Resistance Load Discharge Resistance Current Limit: -0.5 Current Limit: -0.8 Current Limit: -1.2 Secondary current limit (Kickstart) Under Voltage Lock threshold ENABLE Input Voltage ENABLE Input Current Over-temperature Threshold
Conditions
Switch OFF, ENABLE Switch IOUT ENABLE 1.5V VOUT ENABLE IOUT ISINK VOUT 0.8VIN VOUT 0.8VIN VOUT 0.8VIN MIC2014, 2.5V rising falling VIL(max.) VIH(min.) 5.0V increasing decreasing
Units
2.25 2.15
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
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 MIC2014 current limit following current limit event. MIC2014 120µF, CSLEW 10pF, VOUT 120µF, CSLEW 10pF, VOUT
1000
1500
Units
tON_DLY
1000
1500
tOFF_DLY
Output Turn-off Delay
Symbol VESD_HB VESD_MCHN Parameter Electro Static Discharge Voltage: Human Body Model Electro Static 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.
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Timing Diagrams
ENABLE
tON_DLY
tOFF_DLY
VOUT
Switching Delay Times
tRISE
tFALL
Rise Fall Times
tRISE
VOUT
Output Rise Time
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
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)
1.65 1.60 1.55 ILIMIT 1.50 1.45 1.40 1.35 1.30
LIMIT
Temperature (MIC20xx-1.2)
ILIMIT Temperature
1.40 1.20
0.75 0.73 0.71 0.69 0.67 0.65 0.63
LIMIT
Temperature
(MIC20xx 0.8)
(MIC20xx 0.5)
2.5V
ILIMIT
1.00 0.80 0.60 0.40 0.20
Please note that
ILIMIT
plots
1.25 TEMPERATURE (°C)
overlay each 2.5V other. 0.00 TEMPERATURE (°C)
0.61 0.59 0.57 2.5V 0.55 TEMPERATURE (°C)
ILIMIT
ILIMIT TEMPERATURE (°C) 0.5A
1.2A (mOhm) 0.8A (mOhm)
Temperature
Supply Voltage
Temperature
3.3V 2.5V
TEMPERATURE (°C)
2.25 THRESHOLD
UVLO Threshold Temperature
RISING
2.15
FALLING
2.05
TEMPERATURE (°C)
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Functional Characteristics
Current Limit Response Thermal Shutdown
ENABLE (2.5V/div)
Kickstart Response Normal Load with Temporary High Load
ENABLE (2.5V/div)
5.0V RLOAD CLOAD 47µF
VOUT (1V/div)
VOUT (1V/div)
IOUT (250mA/div) Time (ms)
IOUT (0.5A/div) Time (ms)
Kickstart Response Load Short Circuit
Kickstart Response Normal Load with Temporary Short Circuit
ENABLE (1V/div)
ENABLE (2.5V/div)
VOUT (1V/div)
VOUT (1V/div)
IOUT (0.5A/div) Time (ms)
IOUT (0.5A/div) Time (ms)
Kickstart Response Device Enabled into Short Circuit
Inrush Current Response MIC20xx-0.5
CSLEW
ENABLE (2.5V/div)
ENABLE (2.5V/div)
VOUT (1V/div)
VOUT (1V/div)
10µF 22µF47µF 100µF
220µF
470µF
IOUT (0.5A/div) Time (ms)
IOUT (200mA/div) Time (ms)
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
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
Turn-On/Turn-Off
ENABLE (2.5V/div)
5.0V RLOAD CLOAD 100µF VOUT (1V/div)
IOUT (200mA/div) Time (ms)
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Functional Diagram
Under Voltage Detector
Curre Mirror
ENABLE
Control Logic Delay imer Gate Control
VOUT
Thermal Sensor
Slew Rate Control
VREF Current Limit control Loop Factory adjusted
Figure MIC2004/2014 Block Diagram
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014 MIC2014 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 MIC2004/2014's's output, relied upon fully reliably discharge load capacitance, because discharging depends upon characteristics circuitry VIN. ensure proper discharge output capacitance, MIC2004/2014 equipped with discharge which time device Enabled. Current Sensing Limiting MIC2004/2014 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 internally 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, MIC2004/2014 goes into thermal shutdown. Kickstart (MIC2014 only) MIC2014 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, MIC2014 differs markedly from MIC2004 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, MIC2014 acts immediately restrict output current secondary limit duration Kickstart period. After this time August 2005
Figure Kickstart Operation Picture Key: MIC2014 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 (Note: FAULT/ output available MIC2014). 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. MIC2014 drops current limiting. FAULT/ delay period followed FAULT/ going HIGH. (FAULT/ output available MIC2014). 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 FAULT/ ENABLE, considered valid operative. Enable ENABLE HIGH true control signal, which activates
M9999-080305 (408) 955-1690
Micrel main MOSFET switch. ENABLE will operate with logic running from supply voltages 1.8V. ENABLE wire-OR'd with other MIC2004/2014s 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 MIC2004/2014. this reason, MIC2004/2014 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. Thermal Shutdown Thermal shutdown employed protect
MIC2004/MIC2014 MIC2004/2014 from damage should temperature exceed safe operating levels. Thermal shutdown shuts output MOSFET temperature reaches 145°C. MIC2004/2014 will automatically resume operation when temperature cools down 135°C. resumed operation results reheating die, another shutdown cycle will occur MIC2004/2014 will continue cycling between states until offending load been removed. Depending 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.
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Application Information
ILIMIT IOUT measured MIC2004/2014's'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 MIC2004/2014. 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 MIC2004/2014'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.
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 MIC2004/2014 ILIMIT.
NORMALIZED OUTPUT CURRENT
Normalized Output Current Output Voltage (5V)
OUTPUT VOLTAGE
Figure
Figure IOUT Current Limiting VOUT
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
NORMALIZED OUTPUT CURRENT
Normalized Output Current Output Voltage (2.5V)
FAULT/
ENABLE
VOUT
Kickstart Current Limiting
OUTPUT VOLTAGE
IOUT
Load Removed
Figure Kickstart (MIC2014) Kickstart allows brief current surges pass load before onset normal current limiting, which permits dynamic loads draw bursts energy without sacrificing system safety. Functionally, Kickstart forced override normal current limiting function provided MIC2014. 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 MIC2014, 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 MIC2014 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. Kickstart over-ridden thermal protection circuit sufficient internal heating occurs, Kickstart will terminated IOUT Upon cooling, ILIMIT, IKICKSTART. load still present IOUT
Time (ms)
Figure Kickstart Supply Filtering 0.1µF bypass capacitor positioned close pins MIC2004/2014 both good design practice required proper operation MIC2004/2014. This will control supply transients ringing. Without bypass capacitor, large current surges output short cause sufficient ringing (from supply lead inductance) cause erratic operation MIC2004/2014'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 equation used:
Where: junction temperature,
August 2005
M9999-080305 (408) 955-1690
Micrel ambient temperature R(J-A) thermal resistance package normal operation MIC2004/2014's enough that significant heating occurs. Device heating most often caused short circuit, very heavy load, when significant portion input supply voltage appears across MIC2004/2014'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 using packaged MIC2004/2014s design intending supply continuous currents more.
MIC2004/MIC2014
Figure Temperature IOUT
Figure assumes backside contact made thermal provided package. optimal 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 thus extends MIC2004/2014's operating range. should noted that this backside paddle electrically active connected MIC2004/2014's pin.
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
August 2005
M9999-080305 (408) 955-1690
Micrel
MIC2004/MIC2014
Package Information
5-Pin SOT-23 (M5)
2mmX2mm (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. product 2005 M9999-080305 August 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 (408) 955-1690 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. 2004 Micrel, Incorporated. Micrel Products designed authorized components life support appliances, devices systems where malfunction
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