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MIC2505/2506
Micrel
MIC2505/2506
Single 2A / Dual 1A / High-Side Switches
General Description
The MIC2505, MIC2505-1, MIC2505-2, and MIC2506 are single and dual integrated high-side power switches that consist of TTL compatible control/enable inputs, a charge pump, and protected N-channel MOSFETs. The MIC2505/6 family can be used instead of separate high-side drivers and MOSFETs in many low-voltage applications. The MIC2505/6 family controls voltages ranging from 2.7V to 7.5V. The MIC2505-series can deliver at least 2A continuous current while the MIC2506 can deliver at least 1A continuous current from each output. A slow turn-on feature prevents high inrush current when switching capacitive loads. The internal control circuitry is powered from the same 2.7V to 7.5V. Within the device's input range, outputs can be forced higher than the input voltage when disabled. Multipurpose open-drain fault flag outputs indicate overcurrent limiting, open-load detection (except MIC2505-1 and -2 versions), thermal shutdown, or undervoltage lockout for each channel. Overcurrent limiting is internally fixed and requires no external components. Open-load detection is active when the switch is off. When off, a normal load pulls the output pin low. If the load is open, an optional, external, high-value resistor pulls the output pin high, triggering the fault flag. MIC2505-1 and -2 versions are tailored to Universal Serial Bus (USB) applications and do not include open-load detection. Thermal shutdown turns off the output if the die temperature exceeds approximately 135C. If enabled, the switch automatically restarts when the temperature falls 10C. Undervoltage lockout (UVLO) shuts off the output if the supply drops below 2.3V typical and reenables the output when the supply exceeds 2.5V typical.
Features
* Low MOSFET on resistance to 2.7V 30m typical at 5V (MIC2505-series) 35m typical at 3.3V (MIC2505-series) 75m typical at 5V (each MIC2506 output) 80m typical at 3.3V (each MIC2506 output) * 2.7V to 7.5V input * 110A typical on-state supply current * 1A typical off-state supply current * Output can be forced higher than input (off-state) * Current limit * Thermal shutdown * 2.5V undervoltage lockout (UVLO) * Open-load detection (MIC2505BN/M and MIC2506BN/M only) * Open-drain fault flag * 5ms (slow) turn-on and fast turnoff * Logic-level control/enable input
Applications
* * * * * USB Power Distribution 3.3V and 5V power management PC Card card inrush limiting switch Hot plug-in power supplies Battery-charger circuits
Typical Applications
2.7V to 7.5V
Pull-up Resistor (100k) ON OFF 1 2 3 4 Pull-up Resistors (100k each) A ON A OFF
2.7V to 7.5V
MIC2505BM CTL FLG GND GATE OUT IN OUT IN
8 7 6 5
100k Optional Open Load Detect Resistor (MIC2505BN or MIC2505BM only) 0.1F
MIC2506BM
1 2 3 4
100k 100k
8 7 6 5
CTL A OUT A FLG A FLG B IN GND
FAULT
FAULT A FAULT B
B ON B OFF
0.1F
Optional Open Load Detect Resistors
CTL B OUT B
Optional Output Delay Capacitor
Single and Dual Switch/Circuit Breakers with Open-Load Detection and Fault Output
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Load A
Load B
Load
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Micrel
Ordering Information
Part Number Single-Switch MIC2505BM MIC2505YM MIC2505BN MIC2505-1BM MIC2505-1YM MIC2505-1BN MIC2505-2BM MIC2505-2YM MIC2505-2BN Dual Switch MIC2506BM MIC2506YM MIC2506BN Active-High Active-High Active-High Yes Yes Yes -40C to +85C -40C to +85C -40C to +85C 8-pin SOIC 8-pin SOIC 8-pin DIP Standard Pb-Free Standard Active-High Active-High Active-High Active-High Active-High Active-High Active-Low Active-Low Active-Low Yes Yes Yes No No No No No No -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C 8-pin SOIC 8-pin SOIC 8-pin DIP 8-pin SOIC 8-pin SOIC 8-pin DIP 8-pin SOIC 8-pin SOIC 8-pin DIP Standard Pb-Free Standard Standard Pb-Free Standard Standard Pb-Free Standard Control/Enable Open-Load Detect Temperature Range Package Lead Finish
Pin Configuration
MIC2505/-1/-2
CTL FLG GND GATE 1 2 3 4 8 7 6 5 OUT IN OUT IN CTL A FLG A FLG B CTL B 1 2 3 4
MIC2506
8 7 6 5 OUT A IN GND OUT B
MIC2506
MIC2505/-1/-2 (CTL A) 1 (FLG A) 2 (GATE A) 4 3 (GND)
LOGIC, CHARGE PUMP
6, 8 (OUT) 5, 7 (IN)
(CTL A) 1 (FLG A) 2 (FLG B) 3 (CTL B) 4
LOGIC, CHARGE PUMP LOGIC, CHARGE PUMP
8 (OUT A) 7 (IN) 5 (OUT B)
6 (GND)
8-Pin SOIC (M) 8-Pin DIP (N)
8-Pin SOIC (M) 8-Pin DIP (N)
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Pin Description
Pin Number Pin Number MIC2505 series MIC2506 1 1/4 Pin Name CTL (A/B) Pin Function Control (Input): TTL compatible control input. High input typically > 1.8V. Low input typically < 1.6V. MIC2505, MIC2505-1 and MIC2506 are active high. MIC2505-2 is active low. Fault Flag (Output): Active-low, open-drain output. If CTL is low, indicates open load. If CTL is high, indicates current limit, thermal shutdown, or UVLO.
2
2/3
FLG (A/B)
MIC2505-1 and -2 do not support open-load detect.
3 4 5, 7 6 -- 7 GND GATE IN Ground: Return. Output MOSFET Gate: Open for fastest rise time. Connect capacitor to ground to slow rise time. (See MIC2505 Turn-On Delay graph) Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Connect to supply. MIC2505 series only: Pins 5 and 7 must be externally connected together. Switch Output: Output MOSFET source. Typically connect to switched side of load. Output voltage can be pulled above input voltage in off mode. MIC2505 series only: Pins 6 and 8 must be externally connected together.
6, 8
8/5
OUT (A/B)
Absolute Maximum Ratings
Supply Voltage (VIN) .................................................... 8.0V Fault Flag Voltage (VFLG) ............................................. 7.5V Fault Flag Current (IFLG) ............................................ 50mA Output Voltage (VOUT) ................................................. 7.5V Output Current (IOUT) ............................... Internally Limited Gate Voltage (VGATE) ......................................... VIN + 15V Control Input (VCTL) ....................................... -0.3V to 15V Storage Temperature (TA) ....................... -65C to +150C Lead Temperature (Soldering 5 sec.) ....................... 260C
Operating Ratings
Supply Voltage (VIN) ................................... +2.7V to +7.5V Ambient Operating Temperature (TA) ........ -40C to +85C Thermal Resistance SOIC (JA) ......................................................... 160C/W DIP (JA) ............................................................ 105C/W
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Electrical Characteristics
VIN = +5V; GATE = open; TA = 25C, bold indicates -40C TA +85C; unless noted Parameter Supply Current Condition MIC2505-1 MIC2506 MIC2505-2 Control Input Voltage Control Input Current Control Input Capacitance Output MOSFET Resistance MIC2505 series VIN = 5V, TA = 25C VIN = 5V, -40C < TA < +85C VIN = 3.3V, TA = 25C VIN = 3.3V, -40C < TA < +85C VIN = 5V, TA = 25C VIN = 5V, -40C < TA < +85C VIN = 3.3V, TA = 25C VIN = 3.3V, -40C < TA < +85C RL = 10, CGATE = 0 RL = 10 each output RL = 10, CGATE = 0 RL = 10 each output RL = 10, CGATE = 0 RL = 10 each output RL = 10, CGATE = 0 RL = 10 each output 2 1 VCTL = logic low, Note 2 TJ increasing TJ decreasing VIN = 5V, IL = 10mA VIN = 3.3V, IL = 10mA VFLAG = 5V VIN = increasing VIN = decreasing 2.2 2.0 0.5 200 100 500 200 VCTL = logic 0, OUT = open VCTL = logic 1, OUT = open VCTL = logic 0, OUT = open VCTL = logic 1, OUT = open VCTL = logic 0 logic 1 transition VCTL = logic 1 logic 0 transition VCTL = logic 0 VCTL = logic 1 0.8 Min Typ 0.75 110 110 0.75 2.1 1.9 0.01 0.01 1 30 35 75 80 850 700 3000 2000 0.7 0.8 1.5 0.7 4 2 1 135 125 10 15 0.01 2.5 2.3 25 40 1 2.7 2.5 3 1.5 50 60 60 75 125 150 135 165 2000 2000 7500 6000 20 20 20 20 10 MIC2505 series MIC2506 Open Load Threshold, Note 1 Overtemperature Shutdown Threshold Error Flag Output Resistance Error Flag Off Current UVLO Threshold Max 5 240 240 5 2.4 1 1 Units A A A A V V A A pF m m m m m m m m s s s s s s s s A A A V C C A V V
MIC2506
Output Turn-On Delay Output Turn-On Rise Time Output Turnoff Delay Output Turnoff Fall Time Output Leakage Current Current Limit Threshold
MIC2505 series MIC2506 MIC2505 series MIC2506 MIC2505 series MIC2506 MIC2505 series MIC2506
General Note: Devices are ESD protected, however, handling precautions recommended. General Note: All limits guaranteed by testing or statistical analysis. Note 1: Note 2: MIC2505-1 and -2 versions have no open load detect feature. Open-load threshold is the output voltage (VOUT) where FLG becomes active (low) when CTL is low. OUT is pulled high by a 100k external resistor to VIN.
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Test Circuits
+5V 10k VFLG MIC2505/-1/-2 CTL FLG GND GATE OUT IN OUT IN 1F 10
A ON A OFF
+5V 10k VFLG A VFLG B
B ON B OFF
10k MIC2506BM CTL A OUT A FLG A FLG B IN
10
1F GND 10 CTL B OUT B
Typical Characteristics Note 2
MIC2505 Turn-On, Turnoff Characteristics
CONTROL (V) 10
OUTPUT RESISTANCE (m)
Output On Resistance vs. Supply Voltage
100 80 60 40 20 0 MIC2505 MIC2506
ON RESISTANCE (m)
Output On Resistance vs. Temperature
100 MIC2506 80 60 MIC2505 40 20 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
5 0 -5 6
OUTPUT (V)
4 2 0 -2 -2 RL = 5 (IL = 1A) 024 TIME (ms) -2 6 0 2 TIME (s) 4
2
3 4 5 6 7 SUPPLY VOLTAGE (V)
8
MIC2506 Turn-On, Turnoff Characteristics
10
UVLO Threshold Voltage vs. Temperature
3.0
Error Flag Voltage vs. Error Flag Current
400 ERROR FLAG VOLTAGE (mV) FLG = ACTIVE 300 VDD = 3.3V 200
CONTROL (V)
5 0 6 -5
THRESHOLD VOLTAGE (V)
2.5
VIN RISING
OUTPUT (V)
4 2 0 -2 -2 RL = 5 (IL = 1A) 024 TIME (ms) -1 6 0 1 TIME (s) 2
VIN FALLING 2.0
100 VDD = 5V 0 0.1 1 10 100 ERROR FLAG CURRENT (mA)
1.5 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
On-State Supply Current vs. Supply Voltage
SUPPLY CURRENT (A)
SUPPLY CURRENT (A) 200 180 160 140 120 100 80 60 40 20 0 2 3 4 5 6 7 SUPPLY VOLTAGE (V) 8 2.0
Off-State Supply Current vs. Supply Voltage
2.5 THRESHOLD VOLTAGE (V)
Control Threshold vs. Supply Voltage
1.5
2.0
VCTL RISING
1.0
1.5
0.5
VCTL FALLING
0
2
3 4 5 6 7 SUPPLY VOLTAGE (V)
8
1.0
2
3 4 SUPPLY VOLTAGE (V)
5
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On-State Supply Current vs. Temperature
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
Off-State Supply Current vs. Temperature
2.0
THRESHOLD VOLTAGE (V)
Control Threshold vs. Temperature
2.5
200 180 160 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1.5
2.0
VCTL RISING
1.0
1.5
0.5
VCTL FALLING
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
MIC2505 Turn-On Delay with External Gate Capacitance
1000
TURN-ON DELAY (ms)
800 600 400 200 0
0
50 100 150 200 CAPACITANCE (nF)
250
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Block Diagrams
CTL THERMAL SHUTDOWN 1.2V REFERENCE
OSC.
UVLO
IN
CHARGE PUMP GATE CONTROL
CURRENT LIMIT
Not Included in MIC2505-1, -2 OPEN LOAD DETECT OUT FLG
MIC2505/2505-1/2505-2 GND GATE
MIC2505-Series Block Diagram
FLG A
OPEN LOAD DETECT
OUT A
CTL A CHARGE PUMP GATE CONTROL CURRENT LIMIT
OSC.
THERMAL SHUTDOWN
UVLO
1.2V REFERENCE
IN
CHARGE PUMP GATE CONTROL CTL B
CURRENT LIMIT
OPEN LOAD DETECT
OUT B FLG B
MIC2506 GND
MIC2506 Block Diagram
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Duplicate IN and OUT leads are not internally connected. Connect both IN pins to the supply. Connect both OUT leads to the load. Thermal Shutdown Thermal shutdown shuts off the output MOSFET and signals the fault flag if the die temperature exceeds 135C. 10C of hysteresis prevents the switch from turning on until the die temperature drops to 125C. Overtemperature detection functions only when the control input is enabled (output MOSFET is on). Both MIC2506 outputs are shut off during overtemperature, and both flags will go low. Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until VIN (input voltage) exceeds 2.5V typical. After the switch turns on, if VIN drops below 2.3V typical, UVLO shuts off the output MOSFET and turns the fault flag on (active low) until VIN drops below 1.5V. Undervoltage detection functions only when the control input is enabled (output MOSFET is on). Overcurrent Limit The overcurrent limit is preset internally. The preset level prevents damage to the output MOSFET but allows a minimum current of 2A through the output MOSFET of the MIC2505-series and 1A for each output MOSFET of the MIC2506. Output current is monitored by sensing the voltage drop across the output MOSFET drain metal resistance. Overcurrent detection functions only when the control input is enabled (output MOSFET is on) and VIN is above the UVLO threshold. Open-Load Detection Open-load detection is available only on the MIC2505 and MIC2506. The open-load detection feature is not included in the MIC2505-1 or -2 versions. Open-load detection indicates the absence of an output load by activating the fault flag. Open-load detection is optional and is enabled by connecting a high-value pull-up resistor between IN and OUT. If there is no load, the circuit detects a high OUT (output) voltage (typically 1V) and signals the fault flag. Under normal conditions, the low resistance of a typical load pulls OUT low. Open-load detection functions only when the control input is low (output MOSFET is off). Fault Flag FLG is an N-channel, open-drain MOSFET output. The faultflag is active (low) for one or more of the following conditions: open load (except MIC2505-1 and -2 versions), undervoltage, current limit, or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground.
Functional Description
The MIC2505-series and MIC2506 are high-side N-Channel switches. The MIC2505, MIC2505-1, and MIC2506 have active-high enable inputs. The MIC2505-2 has an active-low input. Fault conditions inhibit output transistor turn-on or turnoff when enabled. Control Input CTL (control input) activates the oscillator, thermal shutdown, UVLO, 1.2V reference, and gate control circuits. If there are no fault conditions, the output MOSFET turns on when enabled. Reference A 1.2V bandgap reference supplies a regulated voltage to the thermal shutdown and undervoltage lockout circuits. The reference is only active when CTL is enabled. Oscillator/Charge Pump The oscillator produces an 80kHz square wave output which drives the charge pump. The oscillator is enabled when CTL is active. The charge pump is a voltage quintupler (5x). The charge pump capacitors are self contained. Gate Control The gate control circuit charges the output MOSFET gate from the charge pump output or discharges the MOSFET gate to ground as determined by CTL, thermal shutdown, or UVLO (undervoltage lockout). An optional, external capacitor may be connected to the MIC2505 GATE to lengthen the rise time. This slows the turn on of the MOSFET output switch. (See "MIC2505 Turn-On Delay" graph.) Since this pin connects directly to the MOSFET gate, use ESD precautions when contacting components connected to this pin. Leakage resistance may increase turnon times. Input and Output IN (input) is the supply connection to the logic circuitry and the drain of the output MOSFET. OUT (output) is the source of the output MOSFET. In a typical circuit, current flows through the switch from IN to OUT toward the load. The output MOSFET and driver circuitry are also designed to allow the MOSFET source to be externally forced to a higher voltage than the drain (VOUT > VIN) when the output switch is off and VIN > UVLO minimum. In this situation, the MIC2505/6 avoids undesirable drain to body diode reverse current flow by grounding the body when the switch is off. (The conventional method for optimum turn-on threshold has the source connected to the body. This would allow a large current to flow when Vsource > Vdrain + 0.6V.)
MIC2505 Series Only
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U2 is off, this feature prevents current flow from the load (5V) backward through U2 to the 3.3V supply. (If a discrete MOSFET and driver were used, the MOSFET's internal body diode would short the 5V load to the 3.3V supply.) FLG will be active (low) on any switch that is off whenever the load voltage is greater than the open load threshold (approximately 1V) except for MIC2505-1 and MIC2505-2.
Logic-High = 5V Output Logic-Low = 3.3V Output
Applications Information
Supply Filtering A 0.1F to 1F bypass capacitor from IN to GND, located at the device is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to destroy the internal control circuitry.
Input transients must not exceed the absolute maximum supply voltage (VIN max = 7.5V) even for a short duration.
2.7V to 7.5V MIC2505BM
ON OFF 1 2 3 4
+5V
+3.3V
1N4148 (optional)
U1 MIC2505BM
1 2
U2 MIC2505BM
8 7 6 5 1 2 3 4
CTL FLG GND GATE
OUT IN OUT IN
CTL FLG GND GATE
OUT IN OUT IN
8 7 6 5
CTL FLG GND GATE
OUT IN OUT IN
8
3
7
4
6
0.1F
0.1F
0.1F to 1F
5
Figure 1. Supply Bypassing The bypass capacitor may be omitted only if board design precautions are followed, such as using extremely short supply leads or power and ground planes. Control Input CTL must be driven logic high or logic low, or be pulled high or low for a clearly defined input. Floating the input may cause unpredictable operation. Add a diode clamp if negative spikes may occur. See Figure 2. Open-Load Detection Refer to "Typical Applications" (first page). Open-load detection is available only on the MIC2505 and MIC2506. For USB power distribution applications, the open-load detection feature is not included in the MIC2505-1 or -2 versions. The optional open-load detection resistor supplies a small pull-up current to the load when the output switch is off. (A 100k resistor will draw 50A from a 5V supply.) Normally, the load dominates, pulling OUT low. If the load is absent, the optional resistor pulls OUT high, activating the fault flag if CTL is off. When a load is switched off with CTL, capacitance on the output may cause the open-load function to pull the flag low until the capacitor is discharged below approximately 2.4V. Omit the pull-up resistor when open load detection is not required and for minimum off-state supply current. Power Bus Switch The MIC2505/6 family features a MOSFET reverse current flow prevention circuit. This prevents current from flowing backwards (from OUT to IN) when CTL is disabled as long as VIN is above UVLO minimum. In Figure 2, when U1 is on and Figure 2. 5V/3.3V Switch Concept This circuit's function would otherwise require a dual driver, two MOSFETs, plus two diodes (or a dual driver plus four MOSFETs). Hot Plug-In Applications (Soft-Start) The MIC2505/6 family can be used to protect the socket-side and card-side of a supply circuit from transients caused when a capacitive load is connected to an active supply. The switch presents a high impedance when off, and slowly becomes a low impedance as it turns on. This reduces the inrush current and related voltage drop that result from charging a capacitive load.
Power Control Circuitry
8 7 6 5
3.3V
1 2 3 4
MIC2505BM CTL FLG GND GATE OUT IN OUT IN
Load
Capacitive Load 0.1F
GND Socket
Card
Figure 3. Hot Plug-In Concept A gate capacitor may be added to the MIC2505 to slow the turn on time even more, reducing the inrush current. See "MIC2505 Turn-On Delay" graph. The UVLO feature insures that each time the card is removed and VIN = 0 that the gate of the output switch is discharged to zero volts. A controlled turn-on is executed each time a board is plugged in, even with multiple insertions.
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Applications Information
USB Application Figure 4 depicts a low cost and robust implementation of a four-port, self-powered USB hub circuit employing ganged overcurrent protection.
(+) 4.45V to 5.25V 3.5A max. (-) VBUS D+ D- GND
Ferrite Bead 33F MIC5203-3.3 MIC5207-3.3 LDO Regulator IN OUT GND 4.7 F D+ D- GND 1.0 F 100k 3.3V USB Controller V+ ON/OFF OVERCURRENT MIC2505-2/-1 EN FLG GND GATE OUT IN OUT IN 0.1F 33F 0.01F VBUS D+ D- GND Downstream USB Port 2 500mA max. 33F 0.01F VBUS D+ D- GND Downstream USB Port 1 500mA max.
Bold lines indicate 0.1" wide, 1-oz. copper high-current traces. 33F 0.01F
VBUS D+ D- GND Downstream USB Port 3 500mA max.
VBUS D+ 0.01F 33F D- GND Data Downstream USB Port 4 500mA max.
Figure 4. Ganged-Switch Self-Powered Hub
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Package Information
PIN 1 DIMENSIONS: INCH (MM)
0.380 (9.65) 0.370 (9.40)
0.135 (3.43) 0.125 (3.18)
0.255 (6.48) 0.245 (6.22) 0.300 (7.62)
0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.0375 (0.952) 0.380 (9.65) 0.320 (8.13)
8-Pin Plastic DIP (N)
0.026 (0.65) MAX)
PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.050 (1.27) TYP
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
8-Pin SOP (M)
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MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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 devices or systems are devices or systems that (a) are intended for 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 injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated. M9999-042704
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