LX8584A-12CP

LX8584x-xx TM ® 7A Low Dropout Positive Regualtors P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES Three Terminal Adjustable or Fixed Output Guaranteed 1% Voltage Accuracy over Temperature (LX8584B) Guaranteed < 1.2V Headroom at 7A (LX8584A) Guaranteed < 1.4V Headroom at 7A (LX8584/84B) Output Current of 7A Fast Transient Response 1% Voltage Reference Initial Accuracy Output Short Circuit Protection Built-in Thermal Shutdown Evaluation Board Available: Request LXE9001 Evaluation Kit APPLICATIONS The LX8584/84A/84B series ICs are low dropout three-terminal positive regulators with a nominal 7A output current. This product family is ideally suited for Pentium® Processor and Power PCTM applications requiring fast transient response. The LX8584A is guaranteed to have < 1.2V at 7A and the LX8584/84B < 1.4V at 7A dropout voltage, making them ideal to provide well regulated outputs of 2.5V to 3.6V using a 5V input supply. In addition, the LX8584B also offers ±1% maximum voltage reference accuracy over temperature. Fixed versions are also available and are specified in the Available Options table below. Current limit is trimmed above 7.1A 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 LX8584/84A series products are available in both the through-hole versions of the industry standard 3-pin TO-220 and TO-247 power packages. The LX1431 Programmable Reference utilzed in conjunction with the LX8584 7A LDO products offer precision output voltage (see application below) and are ideal for use in VRE applications. W WW . Microsemi . C OM IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT THE A PPLICATION OF THE LX8584A & LX1431 IN A 75 & 166 MHZ P54C PROCESSORS USING 3.3V CACHE 5V 3 VIN VOUT 2 VO 7A (See Table Below) PLACE IN µP SOCKET CAVITY Pentium™ Processor Supplies Power PC™ Supplies Microprocessor Supplies Low Voltage Logic Supplies Post Regulator for Switching Supply D ROPOUT V OLT AGE VS . O UTPUT C URRENT LX8584A 1kΩ ADJ 1 250pF 2 220µF 10V Low ESR from Sanyo 0.1µF 50V 3 V+ 1 COL REF 8 2.84k Ω 0.1% 1kΩ 0.01µF 3x 330µF, 6.3V Low ESR Oscon Type from Sanyo 100µF x 6 10V AVX TYPE TPS 1.5 LX8584/84A TJ = 125 °C LX1431 SGND FGND 5 6 21k 1% JP1 Input Output Differential V 1k 0.1% µP Load 1µF x 10 SMD LX8584 1.0 LX8584A VOUT 3.50 3.38 JP1 Short Open TYPICAL APPLICATION 120/166MHz, VRE, 3.3V Cache 75/90/100/133MHz, STND, 3.3V Cache 0.5 0 1.75 3.5 5.25 7 Thick traces represent high current traces which must be low resistance / low inductance in order to achieve good transient response. Output Current - (A) LX8584X LX8584X PACKAGE ORDER INFO AVAILABLE OPTIONS TJ (°C) Dropout Voltage 1.4V 1.2V Copyright © 1997 Rev. 1.3, 2005-11-11 P Plastic TO-220 3 pin RoHS Compliant Transition DC: 0543 Part # LX8584/A/B-00 LX8584/A/B/-33 Output Voltage Adjustable 3.3V 0 to 125 LX8584-xxCP LX8584B-xxCP LX8584A-xxCP Other voltage options may be available – please contact factory for details. Note: xx refers to output voltage, please see table to right. Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8584-xxCP-TR) Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8584x-xx TM ® 7A Low Dropout Positive Regualtors P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS Power Dissipation ....................................................................................Internally Limited Input Voltage .................................................................................................................10V Input to Output Voltage Differential..............................................................................10V Maximum Output Current................................................................................................8A Maximum Operating Junction Temperature .................................................................150° Storage Temperature Range.........................................................................-65°C to 150°C Package Peak Temp. for Solder Reflow (40 seconds maximum 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 TAB is GND 3 2 1 W WW . Microsemi . C OM VIN VOUT ADJ/GND* P PACKAGE (Top View) RoHS 100% 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 © 1997 Rev. 1.3, 2005-11-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8584x-xx TM ® 7A Low Dropout Positive Regualtors P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX8585-xxC / 84A-xxC / 84B-xxC with 0°C ≤ TA ≤ 125°C; VIN – VOUT = 3V; IOUT = 7A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Parameter Symbol Test Conditions LX8584x-xx Typ Max 1.25 1.250 1.250 1.250 0.035 0.1 0.01 65 83 55 0.2 1.1 1.2 1.1 2 8 0.25 0.3 0.003 3.30 3.30 3.30 3.30 1 2 5 0.01 83 4 100 5 1.2 1.4 1.3 10 1.263 1.275 1.260 1.263 0.20 0.5 0.02 % % %/W dB µA µA V V V mA A % % % V W WW . Microsemi . C OM Min Units LX8584-00 / 84A-00 / 84B-00 (ADJUSTABLE) IOUT = 10mA, TA = 25°C 10mA < IOUT < 7A, 1.5V < (VIN - VOUT), Reference VIN < 7V, P < PMAX VREF Voltage IOUT = 10mA, TA =25°C LX8584B-00 10mA < IOUT < 7A, 1.5V < (VIN – VOUT), VIN < 7V, P < PMAX Line Regulations (Note 2) ∆VREF(VIN) IOUT = 10mA, 1.5V < (VIN – VOUT), VIN < 7V Load Regulation (Note 2) ∆VREF(IOUT) VIN – VOUT = 3V, 10mA < IOUT < 7A Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse VOUT = 3.3V, f = 120Hz, COUT = 100µF Tantalum, Ripple Rejection (Note 3) VIN = 5V, CADJ = 10µF, IOUT = 7A Adjust Pin Current IADJ 10mA < IOUT < 7A, 1.5V < (VIN – VOUT), Adjust Pin Current Change ∆IADJ VIN < 7V LX8584A ∆V ∆VREF = 1%, IOUT = 7A Dropout Voltage LX8584/84B ∆VREF = 1%, IOUT = 7A LX8584/84B ∆VREF = 1%, IOUT = 6A Minimum Load Current IOUT(MIN) VIN < 7V Maximum Output Current IOUT(MAX) 1.4V < (VIN – VOUT), VIN < 7V Temperature Stability ∆VOUT(T) Long Term Stability ∆VOUT(t) TA = 125°C, 1000hs RMS Output Noise (% of VOUT) VOUT(RMS) TA = 25°C, 10Hz < f < 10kHz LX8584-33 / 84A-33 / 84B-33 (3.3V Fixed VIN = 5V, IOUT = 0mA, TA = 25°C LX8584B-33 4.75V < VIN < 10V, 0mA < IOUT < 7A, Output P < PMAX VOUT Voltage VIN = 5V, IOUT = 0mA, TA = 25°C LX8584/84A-33 4.75 < VIN < 10V, 0mA < IOUT < 7A, P < PMAX ∆VOUT 4.75V < VIN < 7V Line Regulation (Note 2) (VIN) 4.75V < VIN < 10V Load Regulation (Note 2) ∆VOUT(IOUT) VIN = 5V, 0mA < IOUT < IOUT(MAX) Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 7.5V Quiescent Current IQ 0mA < IOUT < IOUT(MAX), 4.75V < VIN < 10V LX8584-xx ∆VOUT = 1%, IOUT = IOUT(MAX) Dropout Voltage LX8584A-xx ∆V ∆VOUT = 1%, IOUT = IOUT(MAX) LX8584B-xx ∆VOUT = 1%, IOUT = IOUT(MAX) Maximum Output Current IOUT(MAX) VIN < 7V Temperature Stability (Note 3) ∆VOUT(T) Long Term Stability (Note 3) ∆VOUT(t) TA = 125°C, 1000hs RMS Output Noise (% of VOUT) TA = 25°C, 10Hz < f < 10kHz VOUT(RMS) (Note 3) LX8584/84A-00 1.238 1.225 1.240 1.238 7 1 3.267 3.234 3.274 3.267 3.333 3.366 3.326 3.333 6 10 15 0.02 10 1.4 1.2 1.4 V 60 mV mV mV %/W dB mA V A % % % 7 8 0.25 0.3 0.003 E ELECTRICALS 1 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. Copyright © 1997 Rev. 1.3, 2005-11-11 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8584x-xx TM ® 7A Low Dropout Positive Regualtors P RODUCTION D ATA S HEET THEORY OF OPERATION The LX8584/84A/84B series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard selfprotection 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 LX8584 / 84A / 84B 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. Recommended Capacitor Values Input Output Adj 10µF 15µF Tantalum, 100µF Aluminum None 10µF 47µF Tantalum, 200µF Aluminum 15µF 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. Power Supply IN LX8584/84A /84B ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) R DSON