LX8586

LX8586 / LX8586A TM ® 6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES ThreeeTerminal Adjustable or Fixed Output Guaranteed < 1.1V Headroom at 6A (LX8586A) Guaranteed < 1.3V Headroom at 6A (LX8586) Output Current of 6A Minimum Fast Transient Response 1% Voltage Reference Initial Accuracy Output Short Circuit Protection Built in Thermal Shutdown Evaluation Board Available: Request LXE9001 Evaluation Kit APPLICATIONS W WW . Microsemi . C OM The LX8586/86A series ICs are low dropout three-terminal regulators with a minimum of 6A output current. Pentium® Processor, Power PCTM, Cyrix® 6x86TM and AMD-K5™ applications requiring fast transient response are ideally suited for this product family. The LX8586A is guaranteed to have < 1.1V at 6A and the LX8586 < 1.3V at 6A dropout voltage, making them ideal to provide well-regulated outputs of 2.5V to 3.6V using a 5V input supply. Fixed versions are also available and specified in the Available Options table below. Current limit is trimmed above 6.1A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload that would create excessive junction temperatures. The LX8586/86A series devices are available in both throughhole versions of the industry-standard, 3-pin TO-220 power packages. Along with the standard μP supply applications, the LX8586 series of products are ideal for Pentium® Pro Processor applications such as GTL+ Bus terminators (see application below). IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT 1.5V, 6 A REGULA TO R H.S. (Note A) 3.3V 1500 µF Sanyo 6MV1500GX From Silverbox Power Supply LX8586 IN ADJ OUT 121 Ω ±1% 1.5V/6A To GTL+ Terminator 4x 1500 µF Sanyo 6MV1500GX GTL+ Bus Terminators ® Pentium Processor Supplies PowerPC® Supplies Microprocessor Supplies Low Voltage Logic Supplies Post Regulator for Switching Supply LXE9001 Evaluation Board for ® Pentium Applications Available Consult Factory CYRIX® 6x86™ AMD-K5™ and AMD-K6™ 24.3 Ω ±1% A PPLICA TION OF LX8586 AS 1.5V GTL + B US T ERMINA TO R Note A: See application note, page 3. PACKAGE ORDER INFO Available Options Per Part # TA (°C) 0 to 125 Dropout Voltage 1.3V 1.1V P Plastic TO-220 3 pin RoHS Compliant Transition DC: 0543 Part # Output Voltage LX8586-xxCP LX8586A-xxCP LX8586/86A-00 Adjustable LX8586/86A-33 3.3V Other voltage options may be available; please contact factory for details. LX8586X-XX LX8586X-XX “xx” refers to output voltage, see table to right. Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8586A-00CP-TR) Pentium is a registered Trademark of Intel Corporation Cyrix is a registered Trademark of Cyrix Corporation. K5 & K6 are trademarks of Advanced Micro Devices PowerPC is a trademark of International Business Machine Copyright © 1996 Rev. 1.0a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8586 / LX8586A TM ® 6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS Power Dissipation ....................................................................................Internally Limited Input Voltage .................................................................................................................10V Input to Output Voltage Differential..............................................................................10V Operating Temperature Range ................................................................................... 150°C Maximum Operating Junction Temperature .............................................................. 150°C Storage Temperature Range.........................................................................-65°C to 150°C Peak Package Solder Reflow Temp.(40 seconds max. exposure) .................. 260°C (+0 -5) Note: 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. PACKAGE PIN OUT W WW . Microsemi . C OM Tab is VOUT 3 2 1 VIN VOUT ADJ/GND* P PACKAGE (Top View) *Pin 1 is GND for fixed Voltage Versions RoHS Package is100% Matte Tin Lead Finish THERMAL DATA P Plastic TO-220 3-Pin 2.7°C/W 60°C/W THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. P D PACKAGE DATA Copyright © 1996 Rev. 1.0a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8586 / LX8586A TM ® 6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C; VIN – VOUT = 3V, IOUT = 6A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Parameter Symbol Test Conditions LX8586/86A-00 Min Typ Max Units ELECTRICAL CHARACTERISTICS W WW . Microsemi . C OM LX8586-00 / LX8586A-00 (ADJUSTABLE) IOUT = 10mA, TA = 25°C 1.238 1.250 1.262 V 10mA < IOUT < 6A, 1.5V < (VIN – VOUT), 1.225 1.250 1.275 VIN < 7V, P < PMAX Line Regulation (Note 2) ∆VREF(VIN) IOUT = 10mA, 1.5V < (VIN – VOUT), VIN < 7V 0.035 0.20 % Load Regulation (Note 2) ∆VREF(IOUT) VIN – VOUT = 3V, 10mA < IOUT < 6A 0.1 0.5 % Thermal Regulation ∆VOUT(Pwr) TA = 25°C, 20ms pulse 0.01 0.02 % /W VOUT = 3.3V, f = 120Hz, COUT = 100µF Tantalum, Ripple Rejection (Note 3) 60 83 dB VIN = 5V, CADJ = 10µF, TA = 25°C, IOUT = 6A Adjust Pin Current IADJ 55 100 µA Adjust Pin Current Change ∆IADJ 10mA < IOUT < 6A, 1.5V < (VIN – VOUT), VIN < 7V 0.2 5 µA LX8586-00 ∆VREF = 1%, IOUT = 6A 1.1 1.3 Dropout Voltage ∆V V LX8586A-00 ∆VREF = 1%, IOUT = 6A 0.9 1.1 Minimum Load Current IOUT(MIN) VIN < 7V 2 10 mA Maximum Output Current IOUT(MAX) 1.4V < (VIN – VOUT), VIN < 7V 6.1 8 A Temperature Stability ∆VOUT(T) 0.25 % Long Term Stability ∆VOUT(t) TA = 125°C, 1000hrs 0.3 % RMS Output Noise (% of VOUT) VOUT(RMS) TA = 25°C, 10Hz < f < 10kHz 0.003 % LX8586-33 / LX8586A-33 (3.3V FIXED) VIN = 5V, IOUT = 0mA, TA = 25°C 3.267 3.3 3.333 Output Voltage VOUT V 4.75V < VIN < 10V, 0mA < IOUT < 6A, P < PMAX 3.235 3.3 3.365 4.75V < VIN < 7V 1 6 Line Regulation (Note 2) ∆VOUT(VIN) mV 4.75V < VIN < 10V 2 10 Load Regulation (Note 2) ∆VOUT(IOUT) VIN = 5V, 10mA < IOUT < IOUT(MAX) 5 15 mV Thermal Regulation (Note 3) ∆VOUT(Pwr) TA = 25°C, 20ms pulse 0.01 0.02 % /W Ripple Rejection (Note 3) COUT = 100µF Tantalum, IOUT = 6A, TA = 25°C 65 83 dB Quiescent Current IQ 0mA < IOUT < IOUT(MAX), 4.75 < VIN < 10V 4 10 mA LX8586-33 ∆VOUT = 1%, IOUT < IOUT(MAX) 1.1 1.3 Dropout Voltage ∆V V LX8586A-33 ∆VOUT = 1%, IOUT < IOUT(MAX) 0.9 1.1 Maximum Output Current IOUT(MAX) VIN < 7A 6.1 8 A Temperature Stability (Note 3) ∆VOUT (T) 0.25 % Long Term Stability (Note 3) ∆VOUT (t) TA = 25°C, 1000 hrs 0.3 1 % RMS Output Noise (% of VOUT) TA = 25°C, 10Hz < f < 10kHz 0.003 % VOUT(RMS) (Note 3) Note 2: 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. Note 3: These parameters, although guaranteed, are not tested in production. Reference Voltage VREF ELECTRICALS ELECTRICALS Copyright © 1996 Rev. 1.0a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8586 / LX8586A TM ® 6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION NOTE The LX8586/86A series ICs are easy to use Low-Dropout (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 LX8586/86A 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. 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 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 stable operation. Input Output Adj 10µF 15µF Tant, 100µF Alum. None 10µF 47µF Tant, 220µF Alum 15µF Chart – Recommended Capacitor Values In order 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 undershoot, can be quickly compared in order to develop an optimum solution. W WW . Microsemi . C OM Power Supply IN LX8586/86A OUT ADJ Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON