LX8580A 7.5A Very Low Dropout Positive Regulator ® TM P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION Low Dropout, 650mV at 7.5A Output Current in Dual Supply Mode Fast Transient Response Remote Sensing 1mV Load Regulation Adjustable Output similar to that of the LX8584 (1.3V @ 7.5A). The LX8580A is supplied in a fiveterminal TO-220, TO-263, or Linfinity’s S-PAK packages, which allows the implementation of remote (Kelvin) voltage sensing. This sensing compensates for output voltage variations due to load changes and resistive voltage drops in connectors and board traces. Typical load regulation measured at the sense pin is less that 1mV for a load current step of 7mA to 7.5A. The LX8580A is ideal for generating a secondary 2V-2.85V low voltage supply on a motherboard where a 3.3V supply is already available. bs ol et e APPLICATIONS/BENEFITS Microprocessor/Micro controller Supplies 3.3V to 2.85V Voltage Conversion High-Current Regulators Post Regulation for Switching Power Supplies WWW . Microsemi .C OM The LX8580A is a highperformance, very low dropout voltage regulator, designed for use with advanced microprocessors, micro controllers, or video graphics controllers. This product can be used with separate voltage supplies for the control and power sections, allowing a power regulation dropout voltage as low as 100mV @ 1.5A. In AGP bus systems requiring regulation of 3.3V to 2.85V @ 3A, the LX8580A has a max dropout of 250mV making it an ideal power supply solution for today’s graphics applications. The LX8580A can also be used in a single voltage supply configuration with a dropout performance IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT 4 V CTR L ≥ V OUT + 1.3V Max V CT RL OUTPUT 3 V OUT LX8580A V PW R ≥ V OUT + V DROPOUT 5 V PW R SENSE ADJUST 1 R1 ⎛ VOUT = VREF ⎜⎜ 1 + ⎝ RL R2 R2 ⎞ ⎟ + I ADJ × R 2 R 1 ⎟⎠ TA (°C) DROPOUT VOLTAGE 0 to 125 0.1V – 0.7V P PACKAGE ORDER INFO Plastic TO-220 S-PAK DF 5-pin 5-Pin DD LX8580A O 2 Plastic TO-263 5-PIN RoHS Compliant Transition DC: 0543 RoHS Compliant Transition DC: 0515 RoHS Compliant Transition DC: 0535 LX8580A-00CP LX8580A-00CDF LX8580A-00CDD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8580A-00CDD-TR) Copyright © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8580A ® TM 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT TAB is OUTPUT 5 VPWR 4 VCTRL 3 OUTPUT 2 ADJUST 1 Peak Package Solder Reflow Temp. (40 second maximum exposure).................. 260°C (+0, -5) SENSE P PACKAGE (5-PIN) (Top View) bs ol et e 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. TAB is OUTPUT THERMAL DATA P Plastic TO-220 5-Pin THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA DD VPWR 4 VCTRL 3 OUTPUT 2 ADJUST 1 SENSE DD PACKAGE (5-PIN) (Top View) Plastic TO-263 5-Pin TAB is OUTPUT THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA DF 3.0°C/W 65°C/W 5 WWW . Microsemi .C OM VCTRL Input Voltage.........................................................................................13V VPWR Input Voltage ............................................................................................7V Power Dissipation ......................................................................Internally Limited Operating Junction Temperature.................................................................. 150°C Storage Temperature Range...........................................................-65°C to 150°C Plastic S-Pack 5-Pin THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 3.0°C/W 35°C/W 3.0°C/W 35°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). θJA assume device is mounted on a 0.5 inch copper pad. The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 5 VPWR 4 VCTRL 3 OUTPUT 2 ADJUST 1 SENSE DF PACKAGE (Top View) 2 Copyright © 2001 Rev. 1.4c, 2007-01-02 PACKAGE DATA O RoHS 100% Matte Tin Lead Finish Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8580A ® TM 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET PIN NAME 1 SENSE DESCRIPTION This pin is the positive side of the reference voltage for the device. With this pin it is possible to Kelvin-sense the output voltage at the load. This pin is the negative side of the reference voltage for the device. Ripple rejection can be improved by adding a small bypass capacitor from the ADJUST pin to ground. The capacitor value should be selected so that: 2 ADJUST CR ≤ 3 4 5 1 2πFRR1 bs ol et e where FR is the ripple frequency and R1 is the value of the resistor between the ADJUST and SENSE leads of the LX8580A OUTPUT This is the regulated power output of the device VCTRL This pin is the voltage supply pin for the control circuitry of the device. The current flow into this pin will be about 1% of the output current. Please refer to the electrical characteristics section of the data sheet for dropout voltage for load conditions. VPWR This is the collector of the power section of the LX8580A. The output load current is supplied through this pin. For the device to regulate, the voltage at this pin must be between 0.1V and 0.8V greater than the output voltage (Higher output current require higher voltages differences between VPWR and OUTPUT). WWW . Microsemi .C OM FUNCTIONAL PIN DESCRIPTION TYPICAL APPLICATION 5.0V Tantalum 33µF VCTRL VOUT = 2.8V OUTPUT ⎛ R ⎞ VOUT = VREF ⎜⎜1+ 2 ⎟⎟ + IADJ × R 2 ⎝ R1 ⎠ SENSE LX8580A R1 500µF VPWR O 3.3V ADJUST R2 R1 = 121Ω R2 = 150Ω Tantalum 100µF PACKAGE DATA Figure 1 – Typical Application Copyright © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8580A ® TM 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET Parameter Symbol Test Conditions VCTRL = 2.75V, VPWR = 2V, ILOAD = 10mA, TA=25°C VREF LX8580A Units Typ Max 1.243 1.250 1.257 1.237 1.250 1.263 bs ol et e Reference Voltage ΔVREF(VIN) Line Regulation Load Regulation ΔVREF(IOUT) Thermal Regulation Thermal Resistance ΔVOUT(Pwr) RθJT Ripple Rejection VCTRL Pin Current (Note 2) ICTRL Adjust Pin Current IADJ Current Limit IOUT(MAX) VCTRL-VOUT Dropout Voltage (Power Section) Minimum VPWR (Note 1) (VPWR - VOUT) (VADJ = 0) VPWR-VOUT O Dropout Voltage (Control Section) Minimum VCTRL (Note 1) (VPWR - VOUT) Minimum Load Current 1.237 60 V 1.250 1.263 1 3 mV 2 6 mV 2 7 mV 0.002 0.65 0.020 2.70 %/W °C/W 80 dB 3 30 33 70 10 50 55 120 mA 20 60 100 μA 7.7 9 0.90 1.00 1.05 1.06 1.10 0.03 0.10 0.13 0.20 0.25 0.38 0.40 0.52 0.59 1.15 1.15 1.18 1.20 1.30 0.05 0.13 0.15 0.25 0.28 0.43 0.45 0.65 0.70 5 10 A V V mA Note 1: Dropout is caused by either minimum control voltage (VCTRL) or minimum power voltage (VPWR). Both parameters are specified with respect to the output voltage. The specifications represent the minimum input/output voltage required to maintain 1% regulation. Note 2: The control pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio. The minimum value is equal to the quiescent current of the device. Note 3: Minimum load current is defined as the amount of output current required to maintain regulation. Typically this current provides the bias to the external resistor divider network used to set the output voltage. Copyright © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 ELECTRICALS VCTRL = 2.7V to 6V, VPWR = 1.75V to 5.5V ILOAD = 10mA to 4A VCTRL = 2.7V to 6V, VPWR = 2.05V to 5.5V ILOAD = 10mA to 7.5A VCTRL = 2.5V to 10V, VPWR = 1.75V to 5.5V ILOAD = 10mA, TA=25°C VCTRL = 2.5V to 10V, VPWR = 1.75V to 5.5V ILOAD = 10mA VCTRL = 2.75V, VPWR = 2.1V ILOAD = 10mA to 7.5A (VADJ = 0) 30ms Pulse Control Circuitry/Power Transistor VCTRL = VPWR = 3.75V Avg, VRIPPLE = 1VP-P VADJ = 0, IOUT = 4A VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 100mA VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 3A VCTRL = 2.75V, VPWR = 1.75V, ILOAD = 3A VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 7.5A VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 0mA, VADJ = 0 VCTRL = 2.75V, VPWR = 2.05V, ΔVOUT = 100mV, VADJ = 0 VPWR = 2.05, ILOAD = 100mA VPWR = 2.05, ILOAD = 1.5A VPWR = 2.05, ILOAD = 3A VPWR = 2.05, ILOAD = 5A VPWR = 2.05, ILOAD = 7.5A VCTRL = 2.75V, ILOAD = 100mA VCTRL = 2.75V, ILOAD = 1.5A, TA = 85°C VCTRL = 2.75V, ILOAD = 1.5A VCTRL = 2.75V, ILOAD = 3A, TA = 85°C VCTRL = 2.75V, ILOAD = 3A VCTRL = 2.75V, ILOAD = 5A, TA = 85°C VCTRL = 2.75V, ILOAD = 5A VCTRL = 2.75V, ILOAD = 7.5A, TA = 85°C VCTRL = 2.75V, ILOAD = 7.5A VCTRL = 5V, VPWR = 3.3V, VADJ = 0 Note 3 Min WWW . Microsemi .C OM ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 125°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures are equal to the ambient temperature. LX8580A ® TM 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET SIMPLIFIED BLOCK DIAGRAM WWW . Microsemi .C OM V CT RL bs ol et e V PW R Current Limiting Amplifier O UTPUT Thermal Overload Voltage Regulation Amplifier SENSE V REF ADJUST Copyright © 2001 Rev. 1.4c, 2007-01-02 BLOCK DIAGRAM O Figure 2 – Simplified Block Diagram Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX8580A 7.5A Very Low Dropout Positive Regulator ® TM P RODUCTION D ATA S HEET Load Regulation vs. Output Current Output Voltage Deviation(%) Reference Voltage vs. Temperature 1.2530 1.2520 1.2515 1.2510 0.20 0.15 0.10 bs ol et e V REF(VOLTS) 1.2525 1.2505 1.2500 0 25 50 75 100 WWW . Microsemi .C OM CHARACTERISTIC CURVES 0.05 0.00 0 125 1 2 TJ (°C) 3 4 5 6 7 8 Output Current (A) VPWR Dropout Voltage vs. IOUT VCTRL Dropout, VPWR=3.25V 1.12 125°C 0.5 85°C 1.08 IOUT (A) V CTRL Dropout (V) 0.6 1.10 1.06 1.04 1.02 0.4 0.3 0°C 0.2 0.1 1.00 0 2 4 6 0.0 8 0 1 2 Output Current (A) 3 4 5 6 7 8 Pow er Dropout (V) Ripple Rejection Transient Response O Ripple Rejection (dB) 100 90 80 70 60 50 Vout=1.25V Vin=3.3V 40 Vripple=1Vpp 30 Cout=820uF electrolytic 20 +2.2uF ceramic Cadj= 0 uF 10 100 1000 10000 100000 GRAPHS Frequency (Hz) Copyright © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX8580A 7.5A Very Low Dropout Positive Regulator ® TM P RODUCTION D ATA S HEET P 5-Pin Plastic TO-220 B Dim S F T A B C D F G J K N R S T MILLIMETERS MIN MAX 14.23 16.51 9.66 10.66 3.56 4.82 0.46 0.89 3.56 4.06 3.40 0.31 1.14 12.70 14.73 6.80 TYP 2.04 2.92 1.14 1.39 5.85 6.85 INCHES MIN MAX 0.560 0.650 0.380 0.420 0.140 0.190 0.018 0.035 0.140 0.160 0.134 0.012 0.045 0.500 0.580 0.268 TYP 0.080 0.115 0.045 0.055 0.230 0.270 MILLIMETERS MIN MAX 10.03 10.67 8.51 9.17 4.19 4.59 1.14 1.40 0.330 0.51 0.74 0.89 1.57 1.83 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 0.029 0.035 0.062 0.072 0.090 0.110 – 0.065 0 0.010 0.575 0.625 7° 3° bs ol et e A 1 C 5 R K D J G N DD WWW . Microsemi .C OM PACKAGE DIMENSIONS 5-Pin Plastic TO-263 I A D Dim C B K F 0° -8° N H E G MECHANICALS O M A B C D E F G H I J K M N J Seating Plane Copyright © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX8580A 7.5A Very Low Dropout Positive Regulator ® TM P RODUCTION D ATA S HEET DF WWW . Microsemi .C OM PACKAGE DIMENSIONS 5-Pin Plastic S-Pak A M C I bs ol et e L D B K H J F G E Note: A B C D E F G H I J K L M MILLIMETERS MIN MAX 9.27 9.52 7.87 8.13 1.78 2.03 8.03 BSC 0.25 BSC 0.63 0.79 1.70 BSC 0.79 1.04 6.50 BSC 0.03 0.13 10.41 10.67 0.25 BSC 0.76 1.27 INCHES MIN MAX 0.365 0.375 0.310 0.320 0.070 0.080 0.316 BSC 0.010 BSC 0.025 0.031 0.067 BSC 0.031 0.041 0.256 BSC 0.001 0.005 0.410 0.420 0.01 BSC 0.03 0.05 MECHANICALS O Dim 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 © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX8580A ® TM 7.5A Very Low Dropout Positive Regulator 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 © 2001 Rev. 1.4c, 2007-01-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9