LX8585-XX_05

LX8585-xx / LX858A-xx TM ® 4.6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES Three Terminal Adjustable or Fixed Output Guaranteed < 1.2V headroom @ 4.6A (LX8585A) Guaranteed < 1.4V headroom @ 4.6A (LX8585) Guaranteed < 1.3V Headroom @ 3A Output Current of 4.6A Minimum Fast Transient Response 1% Voltage Reference Initial Accuracy Output Short Circuit Protection Built-In Thermal Shutdown APPLICATIONS The LX8585/85A Series ICs are low dropout three-terminal regulators with a minimum of 4.6A output current. Pentium® Processor and Power PCTM applications requiring fast transient response are ideally suited for this product family. The LX8585A is guaranteed to have < 1.2V at 4.6A, while the LX8585 are specified for 1.4V, 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 4.6A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any possible overload that would create excessive junction temperatures. The LX8585/85A family is available in both through-hole and surface-mount versions of the industry standard 3-pin TO-220 / TO-263 power packages. The LX1431 Programmable Reference and LX8585A Series products offer precision output voltage and are ideal for use in VRE applications (see application below). For higher current applications, see the LX8584 data sheet. 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 LX8585A & LX1431 IN A 75 & 166 MHZ P54C P ROCESSORS USING 5V CACHE 3 5V VIN VOUT 2 VO 4.6A (See Table Below) 2x 330 µ F, 6.3V Low ESR Oscon Type from Sanyo 100 µ F x 6 10V AVX TYPE TPS PLACE IN µP SOCKET CAVITY Pentium Processor Supplies Power PC Supplies Microprocessor Supplies Low Voltage Logic Supplies Battery Powered Circuit Post Regulator for Switching Supply CYRIX® 6x86™ Supplies AMD-K5™ Supplies Available Options Per Part Number Part # Output Voltage LX8585/85A-00 Adjustable LX8585/85A-15 1.5V LX8585/85A-33 3.3V Other voltage options may be available. Please contact factory for details. LX8585A Part ADJ 1 250pF 1k Ω 1k Ω 0.01 µF 2 220 µF 10V Low ESR from Sanyo 1 COL REF 8 2.84k Ω 0.1% 1k 0.1% 3 V+ µP Load LX1431 Part 0.1 µF 50V 21k 1% JP1 1 µ F x 10 SMD SGND 5 FGND 6 VOUT 3.50 3.38 JP1 Short Open Typical Application 120 / 166MHz, VRE, 5V Cache 75/90/100/133MHz, STND, 5V Cache Thick traces represent high current traces which must be low resistance / low inductance traces in order to achieve good transient response. LX8585 LX8585 PACKAGE ORDER INFO TA (°C) Dropout Voltage P Plastic TO-220 3-Pin RoHS Compliant Transition DC: 0543 DD Plastic TO-263 3-Pin RoHS Compliant Transition DC: 0535 0 to 125 1.4V 1.2V LX8585-xxCP LX8585A-xxCP LX8585-xxCDD LX8585A-xxCDD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8585-15CDD-TR) Copyright © 1997 Rev. 2.2a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8585-xx / LX858A-xx TM ® 4.6A 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 Maximum Operating Junction Temperature .............................................................. 150°C Storage Temperature Range.........................................................................-65°C to 150°C Peak Package Temp. for Solder Reflow (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 GND 3 2 1 VIN VOUT ADJ/GND* P PACKAGE (Top View) TAB is GND VIN VOUT ADJ / GND* 3 2 1 THERMAL DATA DD PACKAGE P PlasticTO-220 3-Pin 3.0°C/W 60°C/W (Top View) * Pin 1 is GND for fixed voltage versions THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA RoHS 100% Matte Tin Lead Finish DD Plastic TO-263 3-Pin 3.0°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. 2.2a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8585-xx / LX858A-xx TM ® 4.6A 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 otherwise noted and the following test conditions:. Parameter Symbol Test Conditions ELECTRICAL CHARACTERISTICS ≤ 70°C except where W WW . Microsemi . C OM Min LX8585/85A Typ Max 1.250 1.250 0.035 0.1 0.01 1.262 1.275 0.20 0.5 0.02 Units LX8585-00 / 8585A-00 (ADJUSTABLE) Reference Voltage Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Ripple Rejection (Note 3) Adjust Pin Current Adjust pin Current Change Dropout Voltage LX8585 LX8585A Minimum Load Current Maximum Output Current (Note 4) Temperature Stability (Note 3) Long Term Stability (Note 3) RMS Output Noise (% of VOUT)(Note 3) LX8585-15 / 8585A-15 (1.5V FIXED) Output Voltage (Note 4) Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation (Note 3) Ripple Rejection (Note 3) Quiescent Current Dropout Voltage LX8585-15 IOUT = 10mA, TA = 25°C 10mA < IOUT < 4.6A, 1.5V < (VIN – VOUT), VIN < 7V, P < PMAX ∆VREF(VIN) IOUT = 10mA, 1.5V < (VIN – VOUT), VIN < 7V VREF(IOUT) VIN – VOUT = 3V, 10mA < IOUT < 4.6V ∆VOUT (Pwr) TA = 25°C, 20ms pulse VOUT = 3.3V, f = 120Hz, COUT = 100µF Tantalum, VIN = 5V, CADJ = 10µF, TA = 25°C, IOUT = 4.6V IADJ 10mA < IOUT < 4.6A, 1.5V < (VIN – VOUT), ∆IADJ VIN < 7V ∆VREF = 1%, IOUT = 4.6A ∆V ∆VREF = 1%, IOUT = 3A ∆VREF = 1%, IOUT = 4.6A IOUT(MIN) VIN < 7V IOUT(MAX) 1.4V < (VIN – VOUT), VIN < 7V ∆VOUT(t) ∆VOUT(t) TA = 125°C, 1000hrs VREF VOUT(RMS) TA = 125°C, 10Hz < f < 10kHz 1.485 1.470 1.238 1.225 V % % %/W dB 100 5 1.4 1.3 1.2 10 6 1 µA µA V mA A % % % 1.515 1.530 3 5 7 0.02 10 1.4 1.3 1.2 1 V mV mV %/W dB mA V % % % 60 83 55 0.2 1.2 1.1 1.1 2 4.6 0.25 0.3 0.003 1.50 1.50 1 1 2.5 0.01 LX8585A-15 Temperature Stability (Note 3) Long Term Stability (Note 3) RMS Output Noise (% of VOUT)(NOTE 3) VIN = 5V, IOUT = 0mA, TA = 25°C 4.75 < VIN < 10V, 0mA < IOUT < 7A, TA = 25°C, P < PMAX 4.75 < VIN < 7V ∆VOUT (VIN) 4.75V < VIN < 10V ∆VOUT(IOUT) VIN = 5V, 10mA < IOUT < IOUT(MAX) ∆VOUT(Pwr) TA = 25°C, 20ms pulse COUT = 100µF (Tantalum), IOUT = 4.6A, TA = 25°C IQ 0mA < IOUT < IOUT(MAX), 4.75V < VIN < 10V ∆VOUT = 1%, IOUT < IOUT(MAX), VIN - VOUT < 7V ∆V ∆VOUT = 1%, IOUT < 3A, VIN - VOUT < 7V ∆VOUT = 1%, IOUT < IOUT(MAX), VIN - VOUT < 7V ∆VOUT(T) ∆VOUT(t) TA = 125°C, 1000hrs VOUT VOUT(RMS) TA = 25°C, 10Hz < f < 10kHz 65 83 4 1.2 1.1 1.1 0.25 0.3 0.003 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 regulations. Note 3: These parameters, although guaranteed, are not tested in production. Note 4: IOUT(MAX) is measured under the condition that VOUT is forced below its nominal value by 100mV. E ELECTRICALS Copyright © 1997 Rev. 2.2a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8585-xx / LX858A-xx TM ® 4.6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION CIRCUITS W WW . Microsemi . C OM (Note A) VIN 10µF IN LX8585/85A OUT ADJ 5V R1 121 Ω 1% C1 10µF* VOUT VIN (Note A) IN LX8585/85A OUT ADJ VOUT** R1 121 Ω C2 100µF 150 µF * C1 improves ripple rejection. X C should be ≈ R1 at ripple frequency. R2 365 Ω 1% C1* 10µF R2 1k Figure 1 – Improving Ripple Rejection Needed if device is far from filter capacitors. ** VOUT = 1.25V 1 + R2 R1 Figure 2 – 1.2V – 8V Adjustable Regulator (Note A) VIN LX8585/85A OUT IN ADJ 10µF 5V 121 Ω 1% 100µF TTL Output 1k 1k 2N3904 365 Ω 1% Figure 3 – 5V Regulator With Shutdown VIN 10µF Tantalum or 100µF Aluminum LX8585-33/85A-33 IN OUT GND 3.3V Min. 15µF Tantalum or 100µF Aluminum capacitor. May be increased without limit. ESR must be less than 50mΩ. A APPLICATIONS Figure 4 – Fixed 3.3V Output Regulator Note A: VIN(MIN) = (Intended VOUT) + (VDROPOUT(MAX)) Copyright © 1997 Rev. 2.2a, 2005-11-10 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8585-xx / LX858A-xx TM ® 4.6A Low Dropout Positive Regulators P RODUCTION D ATA S HEET APPLICATION NOTE The LX8585/85A 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 LX8585/85A 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 10µF 10µF Output 15µF Tantalum, 100µF Aluminum 47µF Tantalum, 220µF Aluminum Adj None 15µF Power Supply IN LX8585/85A ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON