MIC2004/2014 Fixed Current Limit Power Distribution Switch General Description Features MIC2004 and MIC2014 are current limiting, high-side power switches, designed for general purpose power distribution and control in PCs, PDAs, printers and other self-powered systems. MIC2004 and MIC2014's primary functions are current limiting and power switching. They are thermally protected and will shutdown should their internal temperature reach unsafe levels, protecting both the device and the load, under high current or fault conditions. MIC2004/2014 feature a load discharge FET which ensures any output capacitance is discharged when the switch is turned off. This is particularly useful in hot-swapping applications where `cold' connections are desired. Both devices are fully self-contained, with the current limit value being factory set to one of several convenient levels. * * * * 70m typical on-resistance 2.5V - 5.5V operating range Pre-set current limit values; 0.5A, 0.8A and 1.2A Load discharge FET * * * * KickstartTM Thermal Protection Under voltage lock-out Low quiescent current MIC2014 offers a unique new feature: KickstartTM, which allows momentary high current surges to pass unrestricted without sacrificing overall system safety. MIC2004 and MIC2014 are excellent choices for USB and IEEE 1394 (FireWire) applications or for any system where current limiting and power control are desired. The MIC2004 and MIC2014 are offered in space saving 6 pin SOT-23 and 2mm x 2mm MLF packages. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com. Applications * * * * * * * * USB / IEEE 1394 Power Distribution Desktop and Laptop PCs Set top boxes Game consoles PDAs Printers Docking stations Chargers _________________________________________________________________________________________________________ Typical Application MIC2004 MIC2014 VIN VOUT 5V Supply VBUS D+/D- ENABLE USB Port GND VBUS USB Controller D+/D- USB Port Figure 1. Typical Application Circuit Kickstart is a trademark of Micrel, Inc MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com August 2005 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 MIC2000 Family Members Part Number Pin Function Enable CSLEW FAULT/ DLM* -- -- -- -- -- Load Discharge -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Kickstart 2003 2013 2004 2014 2005 2015 2006 2016 -- 2007 2017 2008 2018 2009 2019 * Dynamic Load Management I Limit I Adj. Normal Limiting Fixed Adj. Adj = Adjustable current limit Fixed = Factory programmed current limit Ordering Information Part Number Marking(1) Current Limit MIC2004-0.5YM5 FE05 0.5A MIC2004-0.8YM5 FE08 0.8A MIC2004-1.2YM5 FE12 1.2A MIC2004-0.5YML(2) E05 0.5A MIC2004-0.8YML(2) E08 0.8A (2) E12 1.2A MIC2014-0.5YM5 FM05 0.5A MIC2014-0.8YM5 FM08 0.8A MIC2004-1.2YML FM12 1.2A (2) M05 0.5A MIC2014-0.8YML(2) M09 0.8A (2) M12 1.2A MIC2014-1.2YM5 MIC2014-0.5YML MIC2014-1.2YML Kickstart Pb-Free Package SOT-23-5 No Yes 2mmX2mm MLF SOT-23-5 Yes 2mmX2mm MLF Note: 1. Under-bar symbol ( _ ) may not be to scale 2. Contact factory for availability. August 2005 2 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Pin Configuration 6 VIN VOUT 1 P AD O N BACKSIDE I S G RO U ND NIC 2 NIC 3 VIN 1 5 GND 5 VOUT GND 2 4 NIC ENABLE 3 4 ENABLE 6-Lead 2mmX2mm MLF (ML) Top View SOT 23-5 (M5) Top View Pin Description Pin Number SOT-23 Pin Number MLF Pin Name 1 6 VIN Input 2 5 GND -- 3 4 ENABLE Input 4 3 NIC -- No internal connection. An electrical signal to this pin will have no effect on device operation. 2 NIC -- No internal connection. An electrical signal to this pin will have no effect on device operation. 1 VOUT Output Switch output. The load being driven by MIC2004/2014 is connected to this pin. 5 August 2005 Type Description Supply input. This pin provides power to both the output switch and the MIC2004/2014's internal control circuitry. Ground. Output enable pin. A logic HIGH activates the output switch, applying power to the load attached to VOUT. 3 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Absolute Maximum Ratings(1) Operating Ratings(2) VIN, VOUT ............................................................ -0.3 to 6V All other pins .................................................. -0.3 to 5.5V Power Dissipation.................................. Internally Limited Continuous Output Current..................................... 2.25A Maximum Junction Temperature ........................... 150C Storage Temperature .............................. -65C to 150C Supply Voltage............................................. 2.5V to 5.5V Continuous Output Current Range .................... 0 to 2.1A Ambient Temperature Range .................... -40C to 85C Package Thermal Resistance (JA) SOT-23-5 ............................................. MLF 2x2 mm............................................ MLF 2x2 mm JC (5) .................................. 230C/W 90C/W 45C/W Electrical Characteristics VIN = 5V, TAMBIENT = 25C unless specified otherwise. Bold indicates -40C to +85C limits. Symbol Parameter VIN Switch Input Voltage IIN Internal Supply Current Conditions Min Typ Max Units 5.5 V 1 5 A 80 330 A 2.5 Switch = OFF, ENABLE = 0V IIN Internal Supply Current Switch = ON, IOUT = 0 ENABLE = 1.5V ILEAK Output Leakage Current VIN = 5V, VOUT = 0 V, ENABLE = 0 12 100 A RDS(ON) Power Switch Resistance VIN = 5V, IOUT = 100 mA 70 100 m 125 m RDSCHG Load Discharge Resistance VIN = 5V, ISINK = 5 mA 70 126 200 ILIMIT Current Limit: -0.5 VOUT = 0.8VIN 0.5 0.7 0.9 A ILIMIT Current Limit: -0.8 VOUT = 0.8VIN 0.8 1.1 1.5 A ILIMIT Current Limit: -1.2 VOUT = 0.8VIN 1.2 1.6 2.1 A ILIMIT_2nd Secondary current limit (Kickstart) MIC2014, VIN = 2.5V 2.2 4 6 A UVLOTHRESHOLD Under Voltage Lock Out threshold VIN rising 2.0 2.25 2.5 V VIN falling 1.9 2.15 2.4 V ENABLE Input Voltage VIL(max.) 0.5 V 5 A VEN VIH(min.) 1.5 IEN ENABLE Input Current VEN = 0V to 5.0V OTTHRESHOLD Over-temperature Threshold TJ increasing 145 TJ decreasing 135 August 2005 4 1 C M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 AC Characteristics Symbol Parameter Condition Min Typ Max Units tRISE Output turn-ON rise time RL = 10, CLOAD = 1F, 500 1000 1500 s VOUT = 10% to 90% tD_LIMIT Delay before current limiting MIC2014 77 128 192 ms tRESET Delay before resetting Kickstart current limit delay, tD_LIMIT Out of current limit following a current limit event. 77 128 192 ms tON_DLY Output Turn-on Delay RL = 43, CL = 120F, CSLEW 10pF, 1000 1500 s tOFF_DLY Output Turn-off Delay 700 s Max Units MIC2014 VEN = 50% to VOUT = 10% RL = 43, CL = 120F, CSLEW 10pF, VEN = 50% to VOUT = 90% ESD Symbol Parameter Condition Min VESD_HB Electro Static Discharge Voltage: Human Body Model VOUT and GND 4 2 kV Electro Static Discharge Voltage; Machine Model All pins 200 V VESD_MCHN All other pins Typ kV Machine Model Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only. 5. Requires proper thermal mounting to achieve this performance. August 2005 5 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Timing Diagrams ENABLE 50% 50% tOFF_DLY tON_DLY 90% VOUT 10% Switching Delay Times tFALL tRISE 90% 90% 10% 10% Rise and Fall Times tRISE 90% VOUT 10% Output Rise Time August 2005 6 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Typical Characteristics Supply Current Output Enabled 1.00 25C -40C 80 85C 0.80 0.70 (A) 0.50 0.40 40 -40C 0.30 0.20 20 25C 85C 0.10 4 VIN (V) 5 0 2 6 1.55 1.40 1.35 1.30 1.25 -50 -30 -10 10 30 50 70 TEMPERATURE (C) 1.4 1.2 90 0.60 Please note that 0.40 5V 0.20 3V 90 ILIMIT vs. RON vs. RON vs. Supply Voltage Temperature 100 1.2A 120 100 80 0.8A 0.5A 0.6 60 40 0.4 20 0 -50 -30 -10 10 30 50 70 TEMPERATURE (C) 0 2 90 2.3 2.5 3 3.5 4 4.5 VIN (V) 2.5V 80 60 5V 40 5 5.5 0 -50 -30 -10 10 30 50 70 TEMPERATURE (C) 90 UVLO Threshold vs. Temperature 2.25 THRESHOLD (V) 3.3V 90 20 0.2 V RISING 2.2 V FALLING 2.15 2.1 2.05 -50 August 2005 vs. Temperature 0.61 5V 0.59 3V 0.57 2.5V 0.55 -50 -30 -10 10 30 50 70 TEMPERATURE (C) the 3 plots overlay each 2.5V other. 0.00 -50 -30 -10 10 30 50 70 TEMPERATURE (C) 0.75 0.73 0.71 0.69 0.67 0.65 0.63 90 (MIC20xx - 0.5) Temperature 1.0 0.8 0.80 RON (mOhm) 1.6 LIMIT 1.00 VIN = 5V 1.8 I RON (mOhm) 1.45 0.10 0 -50 -30 -10 10 30 50 70 TEMPERATURE (C) 7 1.20 VIN = 3V 1.50 6 (MIC20xx - 0.8) 1.40 VIN = 2.5V ILIMIT (A) 1.60 4 5 VIN (V) 0.40 0.30 0.20 ILIMIT vs. Temperature vs. Temperature (MIC20xx-1.2) LIMIT 1.65 3 0.80 0.70 0.60 0.50 ILIMIT (A) 3 I ILIMIT (A) 1.00 0.90 0.60 60 0 2 ILIMIT (A) Switch Leakage Current - OFF 0.90 SUPPLY CURRENT (A) SUPPLY CURRENT (A) 100 Supply Current Output Disabled 0 50 100 TEMPERATURE (C) 7 150 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Functional Characteristics Kickstart Response Normal Load with Temporary High Load Current Limit Response Thermal Shutdown ENABLE (2.5V/div) ENABLE (2.5V/div) VIN = 5.0V RLOAD CLOAD = 47F VOUT (1V/div) VOUT (1V/div) IOUT (250mA/div) IOUT (0.5A/div) 0 50 100 150 200 250 300 Time (ms) 350 400 450 500 550 0 ENABLE (1V/div) ENABLE (2.5V/div) VOUT (1V/div) VOUT (1V/div) IOUT (0.5A/div) IOUT (0.5A/div) 50 100 150 200 250 300 350 Time (ms) 400 100 450 500 550 0 50 100 200 250 300 350 Time (ms) 400 450 500 550 150 200 250 300 350 Time (ms) 400 450 500 550 Inrush Current Response MIC20xx-0.5 Kickstart Response Device Enabled into a Short Circuit ENABLE (2.5V/div) ENABLE (2.5V/div) VOUT (1V/div) VOUT (1V/div) IOUT (0.5A/div) RL CSLEW = 0pF 0F 10F 22F47F 100F 220F 470F IOUT (200mA/div) 0 August 2005 150 Kickstart Response Normal Load with Temporary Short Circuit Kickstart Response No Load to Short Circuit 0 50 50 100 150 200 250 300 350 Time (ms) 400 450 500 550 0 8 4 8 12 16 20 24 Time (ms) 28 32 36 40 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) VIN (1/div) VIN (1/div) Enable tied to VIN 0 4 8 12 16 20 24 28 Time (s) 32 36 40 44 48 Enable tied to VIN 0 4 8 12 16 20 24 28 32 36 40 44 48 Turn-On/Turn-Off ENABLE (2.5V/div) VIN = 5.0V RLOAD CLOAD = 100F VOUT (1V/div) IOUT (200mA/div) 0 August 2005 2 4 6 8 Time (ms) 10 12 14 9 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Functional Diagram Under Voltage Detector VIN Curre nt Mirror FE T Pow er FET ENABLE Control Logic and Delay T imer Gate Control VOUT Thermal Sensor Slew Rate Control VREF Current Limit control Loop GND Factory adjusted Figure 2 MIC2004/2014 Block Diagram August 2005 10 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 MIC2014 reverts to its normal current limit. An example of Kickstart operation is shown below. Functional Description Input and Output VIN is both the power supply connection for the internal circuitry driving the switch and the input (Source connection) of the power MOSFET switch. VOUT is the Drain connection of the power MOSFET and supplies power to the load. In a typical circuit, current flows from VIN to VOUT toward the load. Since the switch is bidirectional when enabled, if VOUT is greater than VIN, current will flow from VOUT to VIN. When the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps. However, should VOUT exceed VIN by more than a diode drop (~0.6V), while the switch is disabled, current will flow from output to input via the power MOSFET's body diode. While this effect can be used to advantage when large bypass capacitors are placed on MIC2004/2014's's output, it can not be relied upon to fully or reliably discharge the load capacitance, because discharging depends upon the characteristics of the circuitry at VIN. To ensure proper discharge of any output capacitance, MIC2004/2014 is equipped with a discharge FET which is ON any time the device is not Enabled. OUT OUT Figure 3. Kickstart Operation Picture Key: A) MIC2014 is enabled into an excessive load (slew rate limiting not visible at this time scale) The initial current surge is limited by either the overall circuit resistance and power supply compliance, or the secondary current limit, whichever is less. B) RON of the power FET increases due to internal heating (effect exaggerated for emphasis). C) Kickstart period. D) Current limiting initiated. FAULT/ goes LOW (Note: FAULT/ output is not available on MIC2014). E) VOUT is non-zero (load is heavy, but not a dead short where VOUT = 0. Limiting response will be the same for dead shorts). F) Thermal shutdown followed by thermal cycling. G) Excessive load released, normal load remains. MIC2014 drops out of current limiting. H) FAULT/ delay period followed by FAULT/ going HIGH. (FAULT/ output is not available on MIC2014). Current Sensing and Limiting MIC2004/2014 protects the system power supply and load from damage by continuously monitoring current through the on-chip power MOSFET. Load current is monitored by means of a current mirror in parallel with the power MOSFET switch. Current limiting is invoked when the load exceeds an internally set over-current threshold. When current limiting is activated the output current is constrained to the limit value, and remains at this level until either the load/fault is removed, the load's current requirement drops below the limiting value, or the MIC2004/2014 goes into thermal shutdown. Kickstart (MIC2014 only) The MIC2014 is designed to allow momentary current surges (Kickstart) before the onset of current limiting, which permits dynamic loads, such as small disk drives or portable printers to draw the energy needed to overcome inertial loads without sacrificing system safety. In this respect, the MIC2014 differs markedly from MIC2004 and its peers, which immediately limit load current, potentially starving the motor and causing the appliance to stall or stutter. During this delay period, typically 128 ms, a secondary current limit is in effect. If the load demands a current in excess the secondary limit, MIC2014 acts immediately to restrict output current to the secondary limit for the duration of the Kickstart period. After this time the August 2005 Under Voltage Lock Out Under voltage lock-out insures no anomalous operation occurs before the device's minimum input voltage of 2.5V had been achieved. Prior to reaching this voltage, the output switch (power MOSFET) is OFF and no circuit functions, such as FAULT/ or ENABLE, are considered to be valid or operative. Enable ENABLE is a HIGH true control signal, which activates 11 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 MIC2004/2014 from damage should the die temperature exceed safe operating levels. Thermal shutdown shuts off the output MOSFET if the die temperature reaches 145C. MIC2004/2014 will automatically resume operation when the die temperature cools down to 135C. If resumed operation results in reheating of the die, another shutdown cycle will occur and the MIC2004/2014 will continue cycling between ON and OFF states until the offending load has been removed. Depending on PCB layout, package type, ambient temperature, etc., hundreds of milliseconds may elapse from the incidence of a fault to the output MOSFET being shut off. This delay is due to thermal time constants within the system itself. In no event will the device be damaged due to thermal overload because die temperature is monitored continuously by on-chip circuitry. the main MOSFET switch. ENABLE will operate with logic running from supply voltages as low as 1.8V. ENABLE can be wire-OR'd with other MIC2004/2014s or similar devices without damage to the device. ENABLE may be driven higher than VIN, but no higher than 5.5V. Slew Rate Control Large capacitive loads can create significant current surges when charged through a high-side switch such as the MIC2004/2014. For this reason, MIC2004/2014 provides built-in slew rate control to limit the initial inrush currents upon enabling the power MOSFET switch. Slew rate control is active upon powering up, and upon re-enabling the load. At shutdown, the discharge slew rate is controlled by the external load and output capacitor. Thermal Shutdown Thermal shutdown August 2005 is employed to protect 12 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Application Information ILIMIT vs. IOUT measured MIC2004/2014's's current limiting circuitry is designed to act as a constant current source to the load. As the load tries to pull more than the allotted current, VOUT drops and the input to output voltage differential increases. When VIN -VOUT exceeds 1V, IOUT drops below ILIMIT to reduce the drain of fault current on the system's power supply and to limit internal heating of MIC2004/2014. When measuring IOUT it is important to bear this voltage dependence in mind, otherwise the measurement data may appear to indicate a problem when none really exists. This voltage dependence is illustrated in Figures 4 and 5. In Figure 4 output current is measured as VOUT is pulled below VIN, with the test terminating when VOUT is 1V below VIN. Observe that once ILIMIT is reached IOUT remains constant throughout the remainder of the test. In Figure 5 this test is repeated but with VIN - VOUT exceeding 1V. When VIN - VOUT > 1V, MIC2004/2014's current limiting circuitry responds by decreasing IOUT, as can be seen in Figure 5. In this demonstration, VOUT is being controlled and IOUT is the measured quantity. In real life applications VOUT is determined in accordance with Ohm's law by the load and the limiting current. Figure 5. IOUT in Current Limiting for VIN - VOUT >1V NORMALIZED OUTPUT CURRENT (A) This folding back of ILIMIT can be generalized by plotting ILIMIT as a function of VOUT, as shown below. The slope of VOUT between IOUT = 0 and IOUT = ILIMIT (where ILIMIT = 1) is determined by RON of MIC2004/2014 and ILIMIT. 1.2 Normalized Output Current vs. Output Voltage (5V) 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 OUTPUT VOLTAGE (V) 6 Figure 6. Figure 4. IOUT in Current Limiting for VIN - VOUT 1V August 2005 13 M9999-080305 (408) 955-1690 MIC2004/MIC2014 NORMALIZED OUTPUT CURRENT (A) Micrel 1.2 Normalized Output Current vs. Output Voltage (2.5V) FAULT/ 1.0 ENABLE 0.8 0.6 VOUT 0.4 0.2 0 Kickstart 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (V) Current Limiting 3.0 IOUT Load Removed Figure 7. 0 Kickstart (MIC2014) Kickstart allows brief current surges to pass to the load before the onset of normal current limiting, which permits dynamic loads to draw bursts of energy without sacrificing system safety. Functionally, Kickstart is a forced override of the normal current limiting function provided by MIC2014. The Kickstart period is governed by an internal timer which allows current to pass unimpeded to the load for 128ms and then normal (primary) current limiting goes into action. During Kickstart a secondary current limiting circuit is monitoring output current to prevent damage to the MIC2014, as a hard short combined with a robust power supply can result in currents of many tens of amperes. This secondary current limit is nominally set at 4 Amps and reacts immediately and independently of the Kickstart period. Once the Kickstart timer has finished its count the primary current limiting circuit takes over and holds IOUT to its programmed limit for as long as the excessive load persists. Once MIC2014 drops out of current limiting the Kickstart timer initiates a lock-out period of 128ms such that no further bursts of current above the primary current limit, will be allowed until the lock-out period has expired. Kickstart may be over-ridden by the thermal protection circuit and if sufficient internal heating occurs, Kickstart will be terminated and IOUT AE 0. Upon cooling, if the load is still present IOUT AE ILIMIT, not IKICKSTART. 100 200 300 Time (ms) 400 500 600 Figure 9. Kickstart Supply Filtering A 0.1F to 1F bypass capacitor positioned close to the VIN and GND pins of MIC2004/2014 is both good design practice and required for proper operation of MIC2004/2014. This will control supply transients and ringing. Without a bypass capacitor, large current surges or an output short may cause sufficient ringing on VIN (from supply lead inductance) to cause erratic operation of MIC2004/2014's control circuitry. Good quality, low ESR capacitors, such as Panasonic's TE or ECJ series, are suggested. When bypassing with capacitors of 10F and up, it is good practice to place a smaller value capacitor in parallel with the larger to handle the high frequency components of any line transients. Values in the range of 0.01F to 0.1F are recommended. Again, good quality, low ESR capacitors should be chosen. Power Dissipation Power dissipation depends on several factors such as the load, PCB layout, ambient temperature, and supply voltage. Calculation of power dissipation can be accomplished by the following equation: PD = R DS(ON) x (IOUT )2 To relate this to junction temperature, the following equation can be used: TJ = PD x R (J- A) + TA Where: TJ = junction temperature, August 2005 14 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Figure 10. Die Temperature vs. IOUT TA = ambient temperature R(J-A) is the thermal resistance of the package In normal operation MIC2004/2014's Ron is low enough that no significant I2R heating occurs. Device heating is most often caused by a short circuit, or very heavy load, when a significant portion of the input supply voltage appears across MIC2004/2014's power MOSFET. Under these conditions the heat generated will exceed the package and PCB's ability to cool the device and thermal limiting will be invoked. In Figure 10 die temperature is plotted against IOUT assuming a constant case temperature of 85C. The plots also assume a worst case RON of 140 m at a die temperature of 135C. Under these conditions it is clear that an SOT-23 packaged device will be on the verge of thermal shutdown, typically 145C die temperature, when operating at a load current of 1.25A. For this reason we recommend using MLF packaged MIC2004/2014s for any design intending to supply continuous currents of 1A or more. Figure 10 assumes no backside contact is made to the thermal pad provided on the MLF package. For optimal performance at higher current levels, or in higher temperature environments, thermal contact with the PCB and the exposed power paddle on the back side of the MLF package should be made. This significantly reduces the package's thermal resistance and thus extends the MIC2004/2014's operating range. It should be noted that this backside paddle is electrically active and is connected to MIC2004/2014's GND pin. 2 Vias 0.3 mm diam. to Ground Plane 1.4 mm Die Temperature vs. Iout for Tcase = 85C 160 0.8 mm Die Temperature - C 140 120 Figure 11. Pad for thermal mounting to PCB 100 80 60 40 SOT-23 20 MLF 0 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Iout - Amps August 2005 15 M9999-080305 (408) 955-1690 Micrel MIC2004/MIC2014 Package Information 5-Pin SOT-23 (M5) 6 Pin 2mmX2mm MLF (ML) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support intended for 16 devices or systems are devices or systems that (a) are M999 9-080305 August 2005 surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant (408) 955-1690 injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.