LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT IN 5V + *1500µF 6MV1500GX Sanyo Three-Terminal Adjustable Or Fixed Output Guaranteed <1.3V Headroom at 1.5A (LX8686A/86B) Output Current of 1.5A Minimum Operates Down To 1V Dropout 0.015% Line Regulation 0.1% Load Regulation Evaluation Board Available: Request LXE9001 Evaluation Kit bs ol et e The LX8386/86A/86B series devices are pin-compatible with earlier 3-terminal regulators, such as the 117 series products. While a 10µF output capacitor is required on both input and output of these new devices, this capacitor is generally included in most regulator designs. The LX8386/86A/86B series quiescent current flows into the load, increasing efficiency. This feature contrasts with PNP regulators, where up to 10% of the output current is wasted as quiescent current. The LX8386-xxI is specified over the full industrial temperature range of –25°C to +125°C and the LX8386/86A/86B is specified over the commercial range of 0°C to 125°C. Part LX8386 OUT + 1500µF 2x 6MV1500GX Sanyo 0 to 125 -25 to 125 PART # OUTPUT VOLTAGE LX8386/86A/8B-00 Adjustable LX8386/86A/86B-33 3.3V Table 1 - Available Options PACKAGE ORDER INFO Plastic TO-220 Plastic TO-252 Max Ref Max Dropout DT (D-Pak) 3-Pin P 3-Pin Accuracy Voltage RoHS Compliant RoHS Compliant 2.0% 2.0% 1.0% 2.0% 1.5V 1.3V 1.3V 1.5V DD Plastic TO-263 3-Pin Transition DC: 0532 Transition DC: 0543 RoHS Compliant Transition DC: 0535 LX8386-xxCDT LX8386A-xxCDT LX8386B-xxCDT LX8386-xxIDT LX8386-xxCP LX8386A-xxCP LX8386B-xxCP LX8386-xxIP LX8386-xxCDD LX8386A-xxCDD LX8386B-xxCDD LX8386-xxIDD LX8386X O 200Ω 1% TA (°C) High Efficiency Linear Regulators Post Regulators For Switching Power Supplies Battery Chargers Constant Current Regulators ASIC & Low Voltage IC Supplies Memory Cards Graphics & Sound Chipsets 3.3V at 1.5A 121Ω 1% ADJ APPLICATIONS Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8386-xxCP-TR) Copyright © 2000 Rev. 2.0, 2005-11-02 WWW . Microsemi .C OM The LX8386/86A/86B Series ICs are positive regulators designed to provide 1.5A output current. These regulators yield higher efficiency than currently available devices with all internal circuitry designed to operate down to a 1V input-to-output differential. In each of these products, the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.3V (8386A/ 86B) and 1.5V (8386) at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to 1% (0.8% for the 8386B) initial accuracy and 2% (1% for the 8386B) over line, load, and temperature. Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT WWW . Microsemi .C OM Power Dissipation ................................................................................... Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential............................................................................. 10V Maximum Output Current............................................................................................ 1.5A Operating Junction Temperature Plastic (DT, DD, P Packages) ................................................................................ 150°C Storage Temperature Range....................................................................... -65°C to 150 °C Peak Package Solder Reflow Temp (40 seconds max. exposure) .................260°C (+0, -5) TAB is VOUT 3 VIN 2 VOUT 1 ADJ / GND* DD PACKAGE (3-PIN) (Top View) Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. bs ol et e Note: TAB is VOUT VIN 3 THERMAL DATA DD 2 Plastic TO-263 3-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA THERMAL RESISTANCE-JUNCTION TO TAB, θJT P Plastic TO-220 3-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA THERMAL RESISTANCE-JUNCTION TO TAB, θJT DT Plastic TO-252 3-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA THERMAL RESISTANCE-JUNCTION TO TAB, θJT VOUT ADJ/ GND * 1 DT PACKAGE (3-PIN) 60°C/W 2.7°C/W (Top View) TAB is V OUT 60°C/W 2.7°C/W 3 VIN 2 VOUT 1 ADJ / GND* P PACKAGE (3-PIN) 60°C/W 2.7°C/W (Top View) RoHS Compliant 100% Matte Tin Lead Finish *Pin 1 is GND for fixed voltage versions Junction Temperature Calculation: TJ = TA + (PD x θJT). The θJA & θJT numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. BLOCK DIAGRAM VIN Thermal Limit Circuit Bandgap Circuit Control Circuit Output Circuit SOA Protection Circuit ADJ or GND* PACKAGE DATA O Bias Circuit VOUT Current Limit Circuit *Pin 1 is GND for fixed voltage versions Copyright © 2000 Rev. 2.0, 2005-11-02 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Parameter Min LX8386x-xx Typ Max Units LX8386-00 / 8386A-00 / 8386B-00 (ADJUSTABLE) Reference Voltage (Note 4) LX8386/86A-00 VREF LX8386B-00 Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Δ VREF (VIN) Δ VREF (IOUT) ΔVOUT (Pwr) Adjust Pin Current 1.238 1.250 1.262 V 1.225 1.250 1.270 V 1.240 1.250 1.260 V 1.238 1.250 1.262 V 1.5V < (VIN -VOUT), VIN < 7V, IOUT = 10mA 0.015 0.2 % VIN - VOUT = 3V, 10mA < IOUT < 1.5A 0.15 0.4 % TA = 25°C, 20ms pulse 0.01 0.04 %/W 65 IADJ Adjust Pin Current Change (Note 4) Dropout Voltage IOUT = 10mA, TA = 25°C 10mA < IOUT < IOUT(MAX), 1.5V < (VIN -VOUT), VIN < 10V, P < PMAX IOUT = 10mA, TA = 25°C 10mA < IOUT < IOUT(MAX), 1.5V < (VIN -VOUT), VIN < 10V, P < PMAX VOUT = 5V, f= 120Hz, COUT = 100µF Tantalum, VIN = 6.5V, CADJ = 10µF, IOUT = 1.5A Ripple Rejection (Note 3) LX8386-00 LX8386A/86B-00 Minimum Load Current ` Test Conditions bs ol et e ` Symbol ΔIADJ ΔV 55 100 µA 0.2 5 µA ΔVREF = 1%, IOUT = 1.5A 1.2 1.5 V ΔVREF = 1%, IOUT = 1.5A 1.1 1.3 V 2 10 mA VIN < 10V Maximum Output Current IOUT(MAX) (VIN - VOUT) < 7V Temperature Stability (Note 3) ΔVOUT(T) 1.5 Long Term Stability (Note 3) ΔVOUT(t) TA = 125°C, 1000 hours RMS Output Noise (% of VOUT) ΔVOUT(RMS) TA = 25°C, 10Hz < f < 10kHz (Note 3) LX8386-33/ 8386A-33/ 8386B-33 (3.3V FIXED) VOUT LX8386A/86B-33 Line Regulation (note 2) Load Regulation (note 2) Thermal Regulation ΔVOUT (VIN) ΔVOUT (IOUT) ΔVOUT (Pwr) Ripple Rejection (note 3) Quiescent Current Dropout Voltage LX8386A/86B-33 Copyright © 2000 Rev. 2.0, 2005-11-02 ΔV A % 0.3 1 0.003 % % VIN = 5V, IOUT = 0mA, TA = 25°C 3.267 3.3 3.333 4.75V < VIN < 10V, 0mA < IOUT < 1.5A, P < PMAX 3.235 3.3 3.365 V VIN = 5V, IOUT = 0mA, TA = 25°C 3.274 3.3 3.326 V V 4.75V < VIN < 10V, 0mA < IOUT < 1.5A, P < PMAX 3.267 3.3 3.333 V 4.75V < VIN < 7V 1 6 mV 4.75V < VIN < 10V 2 10 mV VIN = 5V, 0mA < IOUT < IOUT(MAX) 5 15 mV 0.01 0.02 %/W TA = 25°C, 20ms pulse COUT = 100µF (Tantalum), IOUT = 1.5A IQ LX8386-33 2.0 0.25 60 0mA < IOUT < IOUT(MAX), 4.75V < V < 10V 83 dB 4 10 mA ΔVOUT = 1%, IOUT < IOUT(MAX) 1.2 1.5 V ΔVOUT = 1%, IOUT < IOUT(MAX) 1.1 1.3 V Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS O LX8386-33 dB 10mA < IOUT < IOUT(MAX), 1.5V < (VIN -VOUT), VIN<10V IOUT(MIN) Output Voltage (Note 4) 83 WWW . Microsemi .C OM Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX8386x-xxC with 0°C ≤ TA ≤ 125°C and the LX8386-xxI with -25°C ≤ TA ≤ 125°C except where otherwise noted. Test conditions: VIN -VOUT = 3V; IOUT = 1.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (CONTINUED) Parameter Test Conditions Min LX8386x-xx Typ Max Units LX8386-33 / 8386A-33 / 8386B-33 (3.3V FIXED)(CONTINUED) bs ol et e ` Symbol Maximum Output Current IOUT(MAX) Temperature Stability (Note 3) ΔVOUT(T) Long Term Stability (Note 3) ΔVOUT (t) TA=125°C, 1000 hours RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA=25°C, 10Hz < f < 10kHz Note 2 1.5 2.0 0.25 0.3 1 0.003 A % % % Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. These parameters, although guaranteed are not tested in production. See Maximum Output Current Section Copyright © 2000 Rev. 2.0, 2005-11-02 ELECTRICALS O Note 3 Note 4 VIN < 7V WWW . Microsemi .C OM Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX8386x-xxC with 0°C ≤ TA ≤ 125°C and the LX8386-xxI with -25°C ≤ TA ≤ 125°C except where otherwise noted. Test conditions: VIN -VOUT = 3V; IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION NOTES Power Supply IN Part LX8386 OUT Minimum Load (Larger resistor) Full Load (Smaller resistor) ADJ bs ol et e RDSON << RL STABILITY The output capacitor is part of the regulator’s frequency compensation system. Many types of capacitors are available, with different capacitance value tolerances, capacitance temperature coefficients, and equivalent series impedances. For all operating conditions, connection of a 220µF aluminum electrolytic capacitor or a 47µF (<400mΩ ESR) solid tantalum capacitor between the output terminal and ground will guarantee stable operation. If a bypass capacitor is connected between the output voltage adjust (ADJ) pin and ground, ripple rejection will be improved (please see the section entitled “RIPPLE REJECTION”). When ADJ pin bypassing is used, the required output capacitor value increases. Output capacitor values of 220µF (aluminum) or 47µF (tantalum) provide for all cases of bypassing the ADJ pin. If an ADJ pin bypass capacitor is not used, smaller output capacitor values are adequate. The table below shows recommended minimum capacitance values for operation. Minimum Capacitor Values INPUT 10µF 10µF OUTPUT 15µF Tantalum, 100µF Aluminum 47µF Tantalum, 220µF Aluminum ADJ None 15µF O Copyright © 2000 Rev. 2.0, 2005-11-02 10ms 1 sec Figure 1 – Dynamic Input and Output OVERLOAD RECOVERY Like almost all IC power regulators, the LX8386/86A/86B regulators are equipped with Safe Operating Area (SOA) protection. The SOA circuit limits the regulator's maximum output current to progressively lower values as the input-to-output voltage difference increases. By limiting the maximum output current, the SOA circuit keeps the amount of power that is dissipated in the regulator itself within safe limits for all values of input-to-output voltage within the operating range of the regulator. The LX8386/86A/86B SOA protection system is designed to be able to supply some output current for all values of input-to-output voltage, up to the device breakdown voltage. Under some conditions, a correctly operating SOA circuit may prevent a power supply system from returning to regulated operation after removal of an intermittent short circuit at the output of the regulator. This is a normal mode of operation, which can be seen, in most similar products, including older devices such as 7800 series regulators. It is most likely to occur when the power system input voltage is relatively high and the load impedance is relatively low. When the power system is started “cold”, both the input and output voltages are very close to zero. The output voltage closely follows the rising input voltage, and the input-to-output voltage difference is small. The SOA circuit therefore permits the regulator to supply large amounts of current as needed to develop the designed voltage level at the regulator output. Now consider the case where the regulator is supplying regulated voltage to a resistive load under steady state conditions. A moderate input-to-output voltage appears across the regulator but the voltage difference is small enough that the SOA circuitry allows sufficient current to flow through the regulator to develop the designed output voltage across the load resistance. If the output resistor is short-circuited to ground, the input-to-output voltage difference across the regulator suddenly becomes larger by the amount of voltage that had appeared across the load resistor. The SOA circuit reads the increased input-to-output voltage, and cuts back the amount of current that it will permit the regulator to supply to its output terminal. When the short circuit across the output resistor is removed, all the regulator output current will again flow through the output resistor. The maximum current that the regulator can supply to the resistor will be limited by the SOA circuit, based on the large input-to-output Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 APPLICATIONS To ensure good transient response from the power supply system under rapidly changing current load conditions, designers generally use several output capacitors connected in parallel. Such an arrangement serves to minimize the effects of the parasitic resistance (ESR) and inductance (ESL) that are present in all capacitors. Cost-effective solutions that sufficiently limit ESR and ESL effects generally result in total capacitance values in the range of hundreds to thousands of microfarads, which is more than adequate to meet regulator output capacitor specifications. Output capacitance values may be increased without limit. The circuit shown in Figure 1 can be used to observe the transient response characteristics of the regulator in a power system under changing loads. The effects of different capacitor types and values on transient response parameters, such as overshoot and under-shoot, can be compared quickly in order to develop an optimum solution. Star Ground WWW . Microsemi .C OM The LX8386/86A/86B Series ICs are easy to use LowDropout (LDO) voltage regulators. They have all of the standard self-protection features expected of a voltage regulator: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165°C. Use of an output capacitor is REQUIRED with the LX8386/86A/86B series. Please see the table below for recommended minimum capacitor values. These regulators offer a more tightly controlled reference voltage tolerance and superior reference stability when measured against the older pin-compatible regulator types that they replace. LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION NOTES (CONTINUED) C= where: 1 (6.28 × FR × R1) ≡ the value of the capacitor in Farads; select an equal or larger standard value. FR ≡ the ripple frequency in Hz R1 ≡ the value of resistor R1 in ohms At a Ripple frequency of 120Hz, with R1= 100Ω: C C= 1 = 13.3μF (6.28 × 120Hz ×100Ω ) The closest equal or larger standard value should be used, in this case, 15µF. When an ADJ pin bypass capacitor is used, output ripple amplitude will be essentially independent of the output voltage. If an ADJ pin bypass capacitor is not used, output ripple will be proportional to the ratio of the output voltage to the reference voltage: V M = OUT VREF ≡ a multiplier for the ripple seen when the ADJ pin is optimally bypassed. VREF ≡ 1.25V For example, if VOUT = 2.5V the output ripple will be: M VREF ADJ VOUT R1 IADJ 50µA R2 2 .5 V M = =2 1.25V ⎛ R2 ⎞ VOUT = VREF ⎜⎜1 + ⎟ + I ADJ R 2 R1 ⎠ ⎝ Figure 2 – Basic Adjustable Regulator LOAD REGULATION Because the LX8386/86A/86B regulators are three-terminal devices, it is not possible to provide true remote load sensing. Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the resistor divider, (R1), is connected directly to the case of the regulator, not to the load. This is illustrated in Figure 3. If R1 were connected to the load, the effective resistance between the regulator and the load would be: ⎛ R 2 + R1 ⎞ RPeff = RP × ⎜ ⎟ ⎝ R1 ⎠ where: RP ≡ Actual parasitic line resistance. When the circuit is connected as shown in Figure 3, the parasitic resistance appears as its actual value, rather than the higher RPeff. IN VIN Part LX8386 Connect R1 to Case of Regulator ADJ Output ripple will be twice as bad as it would be if the ADJ pin were to be bypassed to ground with a properly selected capacitor. OUTPUT VOLTAGE The LX8386/86A/86B ICs develop a 1.25V reference voltage between the output and the adjust terminal (See Figure 2). By placing a resistor, R1, between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is the specified minimum load current of 10mA. Because IADJ is very small and constant when compared with the current through R1, it represents a small error and can usually be ignored. Copyright © 2000 Rev. 2.0, 2005-11-02 OUT RP Parasitic Line Resistance R1 Connect R2 to Load APPLICATIONS O where: OUT Part LX8386 bs ol et e RIPPLE REJECTION Ripple rejection can be improved by connecting a capacitor between the ADJ pin and ground. The value of the capacitor should be chosen so that the impedance of the capacitor is equal in magnitude to the resistance of R1 at the ripple frequency. The capacitor value can be determined by using this equation: IN VIN WWW . Microsemi .C OM OVERLOAD RECOVERY (continued) voltage across the regulator at the time the short circuit is removed from the output. If this limited current is not sufficient to develop the designed voltage across the output resistor, the voltage will stabilize at some lower value, and will never reach the designed value. Under these circumstances, it may be necessary to cycle the input voltage down to zero in order to make the regulator output voltage return to regulation. RL R2 Figure 3 – Connections for Best Load Regulation Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION NOTES (CONTINUED) Example Given: Find: = 5V VIN VOUT = 2.5V 1.5A IOUT = TA = 50°C 2.7°C/W for TO-220 RθJT = 300 ft/min airflow available Proper Heat Sink to keep IC’s junction temperature below 125°C.** bs ol et e Even when the circuit is configured optimally, parasitic resistance can be a significant source of error. A 20 mil. wide PC trace built from 1 oz. copper-clad circuit board material has a parasitic resistance of about 25 milliohms per inch of its length at room temperature. If a 3-terminal regulator used to supply 2.50 volts is connected by 2 inches of this trace to a load which draws 1.5 amps of current, a 75 millivolt drop will appear between the regulator and the load. Even when the regulator output voltage is precisely 2.50 volts, the load will only see 2.43 volts, which is a 2% error. It is important to keep the connection between the regulator output pin and the load as short as possible, and to use wide traces or heavy-gauge wire. The minimum specified output capacitance for the regulator should be located near the regulator package. If several capacitors are used in parallel to construct the power system output capacitance, any capacitors beyond the minimum needed to meet the specified requirements of the regulator should be located near the sections of the load that require rapidly-changing amounts of current. Placing capacitors near the sources of load transients will help ensure that power system transient response is not impaired by the effects of trace impedance. To maintain good load regulation, wide traces should be used on the input side of the regulator, especially between the input capacitors and the regulator. Input capacitor ESR must be small enough that the voltage at the input pin does not drop below VIN(MIN) during transients. WWW . Microsemi .C OM LOAD REGULATION (continued) Solution: The junction temperature is: TJ = PD (R θJT + R θCS + R θSA ) + TA where: PD RθJT ≡ ≡ RθCS ≡ RθSA ≡ TS TJ VΙΝ(ΜΙΝ) = VOUT + VDROPOUT(MAX) TS R θ CS TA R θ SA First, find the maximum allowable thermal resistance of the heat sink: R θSA = TJ − TA − (R θJT + R θCS ) PD PD = (VIN(MAX) − VOUT ) I OUT = (5.0V − 2.5V ) × 1.5A PD = 3.75W R θSA = 125°C − 50°C − (2.7°C/W + 1.0°C/W) (5.0V − 2.5V) * 1.5A R θSA = 16.3°C/W Next, select a suitable heat sink. The selected heat sink must have RθSA < 3.1°C/W. Thermalloy heatsink 6296B has RθSA = 3.0°C/W with 3000ft/min air flow. Finally, verify that junction temperature remains within specification using the selected heat sink: TJ = 3.75W(2.7°C/W + 1.0°C/W + 12.0°C/W) + 50°C TJ = 109°C ** Although the device can operate up to 150°C junction, it is recommended for long term reliability to keep the junction temperature below 125°C whenever possible. Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 APPLICATIONS THERMAL CONSIDERATIONS The LX8386/86A/86B regulators have internal power and thermal limiting circuitry designed to protect each device under overload conditions. For continuous normal load conditions, however, maximum junction temperature ratings must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. This includes junction to case, case to heat sink interface, and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the back surface of the case directly opposite the die. This is the lowest resistance path for heat flow. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. Thermal compound at the case to heat sink interface is strongly recommended. If the case of the device must be electrically isolated, a thermally conductive spacer can be used, as long as its added contribution to thermal resistance is considered. Note that the case of all devices in this series is electrically connected to the output. O TC R θ JT ≡ the lowest allowable instantaneous voltage at the input pin. VOUT ≡ the designed output voltage for the power supply system. VDROPOUT(MAX) ≡ the specified dropout voltage for the installed regulator. where: VIN(MIN) Copyright © 2000 Rev. 2.0, 2005-11-02 ≡ Dissipated power. Thermal resistance from the junction to the mounting tab of the package. Thermal resistance through the interface between the IC and the surface on which it is mounted. (1.0°C/W at 6 in-lbs mounting screw torque). Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink). Heat Sink Temperature. LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET TYPICAL APPLICATIONS Part LX8386 VIN IN VIN (Note A) OUT Part LX8386 + C1* 10µF VOUT + OUT VOUT** R1 121Ω 1% ADJ + C2 100µF R1 121Ω 1% 10µF ADJ bs ol et e 150µF * C1 improves ripple rejection. XC should be ≈ R1 at ripple frequency. R2 365Ω 1% + R2 1k C1 10µF* WWW . Microsemi .C OM IN (Note A) * Needed if device is far from filter capacitors. ⎛ ⎝ * *VOUT = 1.25V ⎜ 1 + Figure 4 – Improving Ripple Rejection R2 ⎞ ⎟ R1 ⎠ Figure 5 – 1.2V – 8V Adjustable Regulator VIN (note A) + 10µF IN Part LX8386 ADJ OUT 5V 121Ω 1% VIN + 1k Part LX8386 100µF 2N3904 TTL Output IN 10µF Tantalum or 100µF Aluminum 365Ω 1% ADJ 1k OUT 3.3V Min. 15µF Tantalum or 100µF Aluminum capacitor. May be increased without limit. ESR must be less than <400mΩ. O Figure 7 – Fixed 3.3V Output Regulator Figure 6 – 5V Regulator with Shutdown APPLICATIONS Note A: VIN(MIN) = (Intended VOUT ) + VDROPOUT(MAX) Copyright © 2000 Rev. 2.0, 2005-11-02 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET P WWW . Microsemi .C OM PACKAGE DIMENSIONS 3-Pin Plastic TO-220 B S F Dim T Q A B C D F G H J K L N Q R S T U U 1 2 C 3 R H K D L J G N DD INCHES MIN MAX 0.560 0.625 0.380 0.420 0.140 0.190 0.020 0.045 0.139 0.161 0.100 BSC 0.250 0.012 0.045 0.500 0.580 0.045 0.050 0.200 TYP 0.100 0.120 0.080 0.115 0.045 0.055 0.230 0.270 0.020 0.045 MILLIMETERS MIN MAX 10.03 10.67 8.51 9.17 4.19 4.59 1.14 1.40 0.330 0.51 1.19 1.34 2.41 2.66 2.29 2.79 – 1.65 0 0.25 14.60 15.87 7° 3° INCHES MIN MAX 0.395 0.420 0.335 0.361 0.165 0.181 0.045 0.055 0.013 0.020 0.047 0.053 0.095 0.104 0.090 0.110 – 0.065 0 0.010 0.575 0.625 7° 3° bs ol et e A MILLIMETERS MIN MAX 14.22 15.88 9.65 10.67 3.56 4.83 0.51 1.14 3.53 4.09 2.54 BSC 6.35 0.30 1.14 12.70 14.73 1.14 1.27 5.08 TYP 2.54 3.05 2.03 2.92 1.14 1.40 5.84 6.86 0.508 1.14 3-Pin Plastic TO-263 I A D Dim C B M F N H E G 0° -8° J MECHANICALS O K A B C D E F G H I J K M N Seating Plane Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. Copyright © 2000 Rev. 2.0, 2005-11-02 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET DT WWW . Microsemi .C OM PACKAGE DIMENSIONS 3-Pin Plastic TO-252 P U J Dim G INCHES MIN MAX 0.255 0.265 0.235 0.245 0.085 0.095 0.027 0.037 0.015 0.025 0.025 0.035 0.085 0.095 0.033 0.043 0.035 0.045 0.096 0.106 0.376 0.386 0.205 0.215 7.0° 0.020 0.030 0.020 0.030 0.165 0.175 0.030 0.040 0.019 0.029 0.020 0.030 45° 0.057 0.067 0 0.004 bs ol et e N A B C D E F G H I J K L M N O P Q R U V W X MILLIMETERS MIN MAX 6.47 6.73 5.97 6.23 2.16 2.42 0.68 0.94 0.38 0.64 0.63 0.89 2.16 2.42 0.84 1.10 0.89 1.15 2.44 2.70 9.55 9.81 5.20 5.46 7.0° 0.51 0.77 0.51 0.77 4.19 4.45 0.76 1.02 0.48 0.74 0.51 0.77 45° 1.44 1.70 0 0.10 W L A F Q O V 0.23 M H C R D E B X I Copyright © 2000 Rev. 2.0, 2005-11-02 MECHANICALS O K Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10 LX8386x-xx ® TM 1.5A Low Dropout Positive Regulators P RODUCTION D ATA S HEET O bs ol et e WWW . Microsemi .C OM NOTES NOTES PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2000 Rev. 2.0, 2005-11-02 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11