MIC4421A/4422A Micrel MIC4421A/4422A 9A Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process General Description Features MIC4421A and MIC4422A MOSFET drivers are rugged, efficient, and easy to use. The MIC4421A is an inverting driver, while the MIC4422A is a non-inverting driver. * * * * Both versions are capable of 9A (peak) output and can drive the largest MOSFETs with an improved safe operating margin. The MIC4421A/4422A accepts any logic input from 2.4V to VS without external speed-up capacitors or resistor networks. Proprietary circuits allow the input to swing negative by as much as 5V without damaging the part. Additional circuits protect against damage from electrostatic discharge. * * * * * * * MIC4421A/4422A drivers can replace three or more discrete components, reducing PCB area requirements, simplifying product design, and reducing assembly cost. High peak-output current: 9A Peak (typ.) Wide operating range: 4.5V to 18V (typ.) Minimum pulse width: 50ns Latch-up proof: fully isolated process is inherently immune to any latch-up. Input will withstand negative swing of up to 5V High capacitive load drive: 47,000pF Low delay time: 15ns (typ.) Logic high input for any voltage from 2.4V to VS Low equivalent input capacitance (typ.): 7pF Low supply current: 500A (typ.) Output voltage swing to within 25mV of GND or VS Applications * * * * * * * * Modern Bipolar/CMOS/DMOS construction guarantees freedom from latch-up. The rail-to-rail swing capability of CMOS/ DMOS insures adequate gate voltage to the MOSFET during power up/down sequencing. Since these devices are fabricated on a self-aligned process, they have very low crossover current, run cool, use little power, and are easy to drive. Switch mode power supplies Motor controls Pulse transformer driver Class-D switching amplifiers Line drivers Driving MOSFET or IGBT parallel chip modules Local power ON/OFF switch Pulse generators Typical Application Load Load Voltage MIC4421A VS +15V 1 7 VS OUT VS OUT IN GND 0.1F 1F 8 Si9410DY* N-Channel MOSFET 6 0.1F On Off 2 4,5 * Siliconix 30m, 7A max. Load voltage limited by MOSFET drain-to-source rating Low-Side Power Switch Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com October 2002 1 MIC4421A/4422A MIC4421A/4422A Micrel Ordering Information Part Number Configuration Temperature Range Package MIC4421AAM* Inverting -55C to +125C 8-Pin SOIC MIC4421ABM Inverting -40C to +85C 8-Pin SOIC MIC4421ACM Inverting 0C to +70C 8-Pin SOIC MIC4421ABN Inverting -40C to +85C 8-Pin PDIP MIC4421ACN Inverting 0C to +70C 8-Pin PDIP MIC4421ACT Inverting 0C to +70C 5-Pin TO-220 MIC4422AAM* Non-Inverting -55C to +125C 8-Pin SOIC MIC4422ABM Non-Inverting -40C to +85C 8-Pin SOIC MIC4422ACM Non-Inverting 0C to +70C 8-Pin SOIC MIC4422ABN Non-Inverting -40C to +85C 8-Pin PDIP MIC4422ACN Non-Inverting 0C to +70C 8-Pin PDIP MIC4422ACT Non-Inverting 0C to +70C 5-Pin TO-220 *Special order. Contact factory. Pin Configurations VS 1 8 VS IN 2 7 OUT NC 3 6 OUT GND 4 5 GND Plastic DIP (N) SOIC (M) TAB 5 4 3 2 1 OUT GND VS GND IN TO-220-5 (T) Pin Description Pin Number TO-220-5 Pin Number DIP, SOIC Pin Name Pin Function 1 2 IN Control Input. 2, 4 4, 5 GND 3, TAB 1, 8 VS 5 6, 7 OUT 3 NC MIC4421A/4422A Ground: Duplicate pins must be externally connected together. Supply Input: Duplicate pins must be externally connected together. Output: Duplicate pins must be externally connected together. Not connected. 2 October 2002 MIC4421A/4422A Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VS) .................................................... +20V Control Input Voltage (VIN) ............. VS + 0.3V to GND - 5V Control Input Current (VIN > VS) ............................... 50 mA Power Dissipation, TA 25C, Note 4 PDIP (JA) ......................................................... 1478mW SOIC (JA) ........................................................... 767mW 5-Pin TO-220 (JA) ............................................ 1756mW Storage Temperature(TS) ........................ -65C to +150C Lead Temperature (10 sec) ....................................... 300C ESD Rating, Note 3 ...................................................... 2kV Supply Voltage (VS) ..................................... +4.5V to +18V Ambient Temperature (TA) .................................................. A Version .............................................. -55C to +125C B Version ................................................ -40C to +85C C Version ................................................... 0C to +70C Junction Temperature (TJ) ........................................ 150C Package Thermal Resistance, Note 4 8-Pin PDIP (JA) ............................................... 84.6C/W 8-Pin SOIC (JA) ............................................ 163.0C/W 5-Pin TO-220 (JA) ........................................... 71.2C/W 8-Pin PDIP (JC) ............................................... 41.2C/W 8-Pin SOIC (JC) .............................................. 38.8C/W 5-Pin TO-220 (JC) ............................................. 6.5C/W Electrical Characteristics TA = 25C with 4.5 V VS 18V, bold values indicate -55C TA +125C; unless noted Symbol Parameter Condition Min Typ Max Units 18 V Power Supply VS Operating Input Voltage 4.5 IS High Output Quiescent Current VIN = 3V (MIC4422A), VIN = 0 (MIC4421A) 0.5 1.5 3 mA mA Low Output Quiescent Current VIN = 0V (MIC4422A), VIN = 3V (MIC4421A) 50 150 200 A A VIH Logic 1 Input Voltage See Figure 3 VIL Logic 0 Input Voltage See Figure 3 VIN Input Voltage Range IIN Input Current 0 V VIN VS VOH High Output Voltage See Figure 1 VOL Low Output Voltage See Figure 1 RO Output Resistance, Output High IOUT = 10 mA, VS = 18 V RO Output Resistance, Output Low IPK Peak Output Current IDC Continuous Output Current IR Latch-Up Protection Withstand Reverse Current Input 3.0 2.1 1.5 V 0.8 V -5 VS+0.3 V -10 10 A Output VS-.025 V 0.025 V 0.6 1.0 3.6 IOUT = 10 mA, VS = 18 V 0.8 1.7 2.7 VS = 18 V (See Figure 8) 9 A 2 A Duty Cycle 2% t 300 s, Note 5 >1500 mA Switching Time (Note 5) tR Rise Time Test Figure 1, CL = 10,000 pF 20 75 120 ns ns tF Fall Time Test Figure 1, CL = 10,000 pF 24 75 120 ns ns tD1 Delay Time Test Figure 1 15 60 80 ns ns tD2 Delay Time Test Figure 1 35 60 80 ns ns October 2002 3 MIC4421A/4422A MIC4421A/4422A Symbol Micrel Parameter Condition Min Typ Max Units Switching Time (Note 5) tPW Minimum Input Pulse Width See Figure 1. and Figure 2. 50 ns fmax Maximum Input Frequency See Figure 1. and Figure 2. 1 MHz Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Note 4. Minimum footprint. Note 5. Guaranteed by design. Test Circuits VS = 18V VS = 18V 0.1F 0.1F 4.7F VOUT VIN 0.1F 0.1F VOUT VIN 10,000pF 10,000pF MIC4421A INPUT MIC4422A 5V 90% 2.5V tPW 50ns 10% 0V VS 90% tD1 tPW 4.7F tF INPUT 2.5V tPW 50ns 10% 0V tR tD2 5V 90% tD1 VS 90% tPW tR tD2 tF OUTPUT OUTPUT 10% 0V 10% 0V Figure 1. Inverting Driver Switching Time Figure 2. Noninverting Driver Switching Time Control Input Behavior Logic 1 Logic 0 Guaranteed VIL Guaranteed 0.8V 3V Typical 0V VIL VIH Typical 1.5V 2.1V VIH VS Figure 3. Input Hysteresis MIC4421A/4422A 4 October 2002 MIC4421A/4422A Micrel 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 18 Rise Time vs. Capacitive Load 300 5V FALL TIME (ns) 200 TIME (ns) 10 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 150 10V 100 5V 150 10V 100 18V 18V 50 150 6 100 1000 10k CAPACITIVE LOAD (pF) Supply Current vs. Capacitive Load 45 30 100k 1M FREQUENCY (Hz) 10M F 1000 pF 0.01 F 40 20 0 10k 100 1000 10k CAPACITIVE LOAD (pF) 100k Supply Current vs. Frequency VS = 5V SUPPLY CURRENT (mA) 20 Hz 1M 15 60 100 60 18 60 0 100k Supply Current vs. Frequency 80 16 100k 1M FREQUENCY (Hz) 5 10M 50 40 30 1000 pF 30 8 10 12 14 VOLTAGE (V) F Hz 1M 50 kH z 60 0.1 1000 pF F 60 October 2002 75 4 VS = 5V 90 120 40 10k 10-8 VS = 12V 0.01 80 PER TRANSITION 10-9 Supply Current vs. Capacitive Load 120 0 100k VS = 18V 120 Crossover Energy vs. Supply Voltage 10-7 100k 120 0.01 1000 10k CAPACITIVE LOAD (pF) Supply Current vs. Frequency 100 1000 10k CAPACITIVE LOAD (pF) 20 0k H z 50 kH z Hz 1M 100 100 -40 0 40 80 TEMPERATURE (C) VS = 12V SUPPLY CURRENT (mA) VS = 18V 140 0 0 100k SUPPLY CURRENT (mA) 160 50 Supply Current vs. Capacitive Load F SUPPLY CURRENT (mA) 180 1000 10k CAPACITIVE LOAD (pF) 20 0k H z 220 200 180 160 140 120 100 80 60 40 20 0 100 0.1 SUPPLY CURRENT (mA) 0 0 18 Fall Time vs. Capacitive Load 200 tRISE F RISE TIME (ns) 10,000pF 250 250 30 20 22,000pF 4 tFALL 40 0.1 4 47,000pF 50 kH z 10,000pF CL = 10,000pF VS = 18V 50 20 0k H z 22,000pF Rise and Fall Times vs. Temperature 60 CROSSOVER ENERGY (A*s) 300 47,000pF 220 200 180 160 140 120 100 80 60 40 20 0 Fall Time vs. Supply Voltage SUPPLY CURRENT (mA) 220 200 180 160 140 120 100 80 60 40 20 0 Rise Time vs. Supply Voltage FALL TIME (ns) RISE TIME (ns) Typical Characteristics 20 10 0 10k 100k 1M FREQUENCY (Hz) 10M MIC4421A/4422A MIC4421A/4422A Micrel 20 tD1 10 0 QUIESCENT SUPPLY CURRENT (A) TIME (ns) tD2 30 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 18 Quiescent Supply Current vs. Temperature 1000 VS = 18V INPUT = 1 100 INPUT = 0 10 -40 0 40 80 TEMPERATURE (C) MIC4421A/4422A 120 HIGH-STATE OUTPUT RESISTANCE () TIME (ns) 40 120 110 100 90 80 70 60 50 40 30 20 10 0 50 40 30 tD2 20 tD2 tD1 10 0 2 4 6 INPUT (V) tD1 8 TJ = 150C TJ = 25C 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 6 0 10 High-State Output Resist. vs. Supply Voltage 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 Propagation Delay vs. Temperature VS = 10V TIME (ns) 50 Propagation Delay vs. Input Amplitude 18 LOW-STATE OUTPUT RESISTANCE () Propagation Delay vs. Supply Voltage -40 0 40 80 TEMPERATURE (C) 120 Low-State Output Resist. vs. Supply Voltage 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 TJ = 150C TJ = 25C 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 18 October 2002 MIC4421A/4422A Micrel Functional Diagram VS MIC4421A INVERTING 0.3mA 0.1mA Q3 Q2 OUT IN 2k Q1 MIC4422A NONINVERTING Q4 GND Figure 4. MIC4421A/22A Block Diagram Functional Description Refer to the functional diagram. The MIC4422A is a noninverting driver. A logic high on the IN produces gate drive output. The MIC4421A is an inverting driver. A logic low on the IN produces gate drive output. The output is used to turn on an external N-channel MOSFET. Supply VS (supply) is rated for +4.5V to +18V. External capacitors are recommended to decouple noise. Input IN (control) is a TTL-compatible input. IN must be forced high or low by an external signal. A floating input will cause unpredictable operation. A high input turns on Q1, which sinks the output of the 0.1mA and the 0.3mA current source, forcing the input of the first inverter low. Hysteresis The control threshold voltage, when IN is rising, is slightly higher than the control threshold voltage when CTL is falling. When IN is low, Q2 is on, which applies the additional 0.3mA current source to Q1. Forcing IN high turns on Q1 which must sink 0.4mA from the two current sources. The higher current October 2002 through Q1 causes a larger drain-to-source voltage drop across Q1. A slightly higher control voltage is required to pull the input of the first inverter down to its threshold. Q2 turns off after the first inverter output goes high. This reduces the current through Q1 to 0.1mA. The lower current reduces the drain-to-source voltage drop across Q1. A slightly lower control voltage will pull the input of the first inverter up to its threshold. Drivers The second (optional) inverter permits the driver to be manufactured in inverting and noninverting versions. The last inverter functions as a driver for the output MOSFETs Q3 and Q4. Output OUT is designed to drive a capacitive load. VOUT (output voltage) is either approximately the supply voltage or approximately ground, depending on the logic state applied to IN. If IN is high, and VS (supply) drops to zero, the output will be floating (unpredictable). 7 MIC4421A/4422A MIC4421A/4422A Micrel To guarantee low supply impedance over a wide frequency range, a parallel capacitor combination is recommended for supply bypassing. Low inductance ceramic disk capacitors with short lead lengths (< 0.5 inch) should be used. A 1F low ESR film capacitor in parallel with two 0.1F low ESR ceramic capacitors, (such as AVX RAM Guard(R)), provides adequate bypassing. Connect one ceramic capacitor directly between pins 1 and 4. Connect the second ceramic capacitor directly between pins 8 and 5. Grounding The high current capability of the MIC4421A/4422A demands careful PC board layout for best performance. Since the MIC4421A is an inverting driver, any ground lead impedance will appear as negative feedback which can degrade switching speed. Feedback is especially noticeable with slow-rise time inputs. The MIC4421A input structure includes about 600mV of hysteresis to ensure clean transitions and freedom from oscillation, but attention to layout is still recommended. Figure 7 shows the feedback effect in detail. As the MIC4421A input begins to go positive, the output goes negative and several amperes of current flow in the ground lead. As little as 0.05 of PC trace resistance can produce hundreds of millivolts at the MIC4421A ground pins. If the driving logic is referenced to power ground, the effective logic input level is reduced and oscillation may result. To insure optimum performance, separate ground traces should be provided for the logic and power connections. Connecting the logic ground directly to the MIC4421A GND pins will ensure full logic drive to the input and ensure fast output switching. Both of the MIC4421A GND pins should, however, still be connected to power ground. Applications Information Supply Bypassing Charging and discharging large capacitive loads quickly requires large currents. For example, charging a 10,000pF load to 18V in 50ns requires 3.6A. The MIC4421A/4422A has double bonding on the supply pins, the ground pins and output pins. This reduces parasitic lead inductance. Low inductance enables large currents to be switched rapidly. It also reduces internal ringing that can cause voltage breakdown when the driver is operated at or near the maximum rated voltage. Internal ringing can also cause output oscillation due to feedback. This feedback is added to the input signal since it is referenced to the same ground. VS 1F MIC4421A VS 2 1 Drive Signal Conduction Angle Control 0C to 180C Conduction Angle Control 180C to 360C 3 1 Drive Logic 1F VS VS MIC4422A Phase 1 of 3 Phase Motor Driver Using MIC4421A/22A Figure 5. Direct Motor Drive 1N4448 (x2) 5.6k Output Voltage vs. Load Current 30 560k 29 1F WIMA MKS2 0.1F 50V VOLTS VIN +15V BYV 10 (x2) 28 12 LINE 27 MIC4422A 0.1F WIMA MKS2 500F 50V 100F 50V United Chemcon SXE 26 25 0 50 100 150 200 250 300 350 mA Figure 6. Self Contained Voltage Doubler MIC4421A/4422A 8 October 2002 MIC4421A/4422A Micrel Input Stage The input voltage level of the MIC4421A changes the quiescent supply current. The N-Channel MOSFET input stage transistor drives a 320A current source load. With a logic "1" input, the quiescent supply current is typically 500A. Logic "0" input level signals reduce quiescent current to 80A typical. The MIC4421A/4422A input is designed to provide 600mV of hysteresis. This provides clean transitions, reduces noise sensitivity, and minimizes output stage current spiking when changing states. Input voltage threshold level is approximately 1.5V, making the device TTL compatible over the full temperature and operating supply voltage ranges. Input current is less than 10A. The MIC4421A can be directly driven by the TL494, SG1526/ 1527, SG1524, TSC170, MIC38C42, and similar switch mode power supply integrated circuits. By offloading the power-driving duties to the MIC4421A/4422A, the power supply controller can operate at lower dissipation. This can improve performance and reliability. The input can be greater than the VS supply, however, current will flow into the input lead. The input currents can be as high as 30mA p-p (6.4mARMS) with the input. No damage will occur to MIC4421A/4422A however, and it will not latch. The input appears as a 7pF capacitance and does not change even if the input is driven from an AC source. While the device will operate and no damage will occur up to 25V below the negative rail, input current will increase up to 1mA/V due to the clamping action of the input, ESD diode, and 1k resistor. Power Dissipation CMOS circuits usually permit the user to ignore power dissipation. Logic families such as 4000 and 74C have outputs which can only supply a few milliamperes of current, and even shorting outputs to ground will not force enough current to destroy the device. The MIC4421A/4422A on the other hand, can source or sink several amperes and drive large capacitive loads at high frequency. The package power dissipation limit can easily be exceeded. Therefore, some attention should be given to power dissipation when driving low impedance loads and/or operating at high frequency. The supply current vs. frequency and supply current vs. capacitive load characteristic curves aid in determining power dissipation calculations. Table 1 lists the maximum safe operating frequency for several power supply voltages when driving a 10,000pF load. More accurate power dissipation figures can be obtained by summing the three dissipation sources. Given the power dissipation in the device, and the thermal resistance of the package, junction operating temperature for any ambient is easy to calculate. For example, the thermal resistance of the 8-pin plastic DIP package, from the data sheet, is 84.6C/W. In a 25C ambient, then, using a maximum junction temperature of 150C, this package will dissipate 1478mW. Accurate power dissipation numbers can be obtained by summing the three sources of power dissipation in the device: * Load Power Dissipation (PL) * Quiescent power dissipation (PQ) * Transition power dissipation (PT) Calculation of load power dissipation differs depending on whether the load is capacitive, resistive or inductive. Resistive Load Power Dissipation Dissipation caused by a resistive load can be calculated as: PL = I2 RO D where: I= the current drawn by the load RO = the output resistance of the driver when the output is high, at the power supply voltage used. (See data sheet) D = fraction of time the load is conducting (duty cycle). VIN +18V WIMA MKS-2 1F +5.0V Table 1: MIC4421A Maximum Operating Frequency VS Max Frequency +18V 1 TEK Current Probe 6302 8 6, 7 MIC4421A 0V 5 0.1F 4 Logic Ground 2500pF Polycarbonate 6 Amps 300mV Power Ground 0.1F 0V 18V 220kHz 15V 300kHz 10V 640kHz 5V 2MHz Conditions: 1. JA = 150C/W 2. TA = 25C 3. CL = 10,000pF PC Trace Resistance = 0.05 Figure 7. Switching Time Degradation Due to Negative Feedback October 2002 9 MIC4421A/4422A MIC4421A/4422A Micrel Capacitive Load Power Dissipation Dissipation caused by a capacitive load is simply the energy placed in, or removed from, the load capacitance by the driver. The energy stored in a capacitor is described by the equation: E = 1/2 C V2 Transition Power Dissipation Transition power is dissipated in the driver each time its output changes state, because during the transition, for a very brief interval, both the N- and P-Channel MOSFETs in the output totem-pole are ON simultaneously, and a current is conducted through them from VS to ground. The transition power dissipation is approximately: As this energy is lost in the driver each time the load is charged or discharged, for power dissipation calculations the 1/2 is removed. This equation also shows that it is good practice not to place more voltage in the capacitor than is necessary, as dissipation increases as the square of the voltage applied to the capacitor. For a driver with a capacitive load: PL = f C (VS PT = 2 f VS (A*s) where (Axs) is a time-current factor derived from the typical characteristic curve "Crossover Energy vs. Supply Voltage." Total power (PD) then, as previously described is just: PD = PL + PQ + PT )2 Definitions CL = Load Capacitance in Farads. where: f = Operating Frequency C = Load Capacitance VS = Driver Supply Voltage D = Duty Cycle expressed as the fraction of time the input to the driver is high. f = Operating Frequency of the driver in Hertz. Inductive Load Power Dissipation For inductive loads the situation is more complicated. For the part of the cycle in which the driver is actively forcing current into the inductor, the situation is the same as it is in the resistive case: IH = Power supply current drawn by a driver when both inputs are high and neither output is loaded. IL = Power supply current drawn by a driver when both inputs are low and neither output is loaded. PL1 = I2 RO D ID = Output current from a driver in Amps. However, in this instance the RO required may be either the on-resistance of the driver when its output is in the high state, or its on-resistance when the driver is in the low state, depending on how the inductor is connected, and this is still only half the story. For the part of the cycle when the inductor is forcing current through the driver, dissipation is best described as: PD = Total power dissipated in a driver in Watts. PL = Power dissipated in the driver due to the driver's load in Watts. PQ = Power dissipated in a quiescent driver in Watts. PT = Power dissipated in a driver when the output changes states ("shoot-through current") in Watts. NOTE: The "shoot-through" current from a dual transition (once up, once down) for both drivers is stated in Figure 7 in ampere-nanoseconds. This figure must be multiplied by the number of repetitions per second (frequency) to find Watts. PL2 = I VD (1 - D) where VD is the forward drop of the clamp diode in the driver (generally around 0.7V). The two parts of the load dissipation must be summed in to produce PL: PL = PL1 + PL2 RO = Output resistance of a driver in Ohms. Quiescent Power Dissipation Quiescent power dissipation (PQ, as described in the input section) depends on whether the input is high or low. A low input will result in a maximum current drain (per driver) of 0.2mA; a logic high will result in a current drain of 3.0mA. Quiescent power can therefore be found from: VS = Power supply voltage to the IC in Volts. PQ = VS [D IH + (1 - D) IL] where: IH = IL = D= VS = Quiescent current with input high Quiescent current with input low Fraction of time input is high (duty cycle) Power supply voltage MIC4421A/4422A 10 October 2002 MIC4421A/4422A Micrel +18V WIMA MK22 1F +5.0V +18V 1 TEK Current Probe 6302 8 6, 7 MIC4421A 0V 5 0.1F 4 0.1F 0V 10,000pF Polycarbonate Figure 8. Peak Output Current Test Circuit October 2002 11 MIC4421A/4422A MIC4421A/4422A Micrel Package Information PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.255 (6.48) 0.245 (6.22) 0.135 (3.43) 0.125 (3.18) 0.300 (7.62) 0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.130 (3.30) 0.100 (2.54) 0.380 (9.65) 0.320 (8.13) 0.0375 (0.952) 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 0.064 (1.63) 0.045 (1.14) 0.197 (5.0) 0.189 (4.8) 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) 0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79) 8-Pin SOIC (M) MIC4421A/4422A 12 October 2002 MIC4421A/4422A Micrel 0.150 D 0.005 (3.81 D 0.13) 0.177 0.008 (4.50 0.20) 0.400 0.015 (10.16 0.38) 0.050 0.005 (1.27 0.13) 0.108 0.005 (2.74 0.13) 0.241 0.017 (6.12 0.43) 0.578 0.018 (14.68 0.46) SEATING PLANE 7 Typ. 0.550 0.010 (13.97 0.25) 0.067 0.005 (1.70 0.127) 0.032 0.005 (0.81 0.13) 0.268 REF (6.81 REF) 0.018 0.008 (0.46 0.20) 0.103 0.013 (2.620.33) Dimensions: inch (mm) 5-Lead TO-220 (T) MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel, Inc. (c) 2002 Micrel, Incorporated October 2002 13 MIC4421A/4422A