A LINFINITY M I C R O S E M I LX8580A 7.5A Very Low Dropout Positive Regulator C O M P A N Y 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. APPLICATIONS/BENEFITS APPLICATIONS/BENEFITS ! Microprocessor/Micro controller Supplies ! 3.3V to 2.85V Voltage Conversion ! High-Current Regulators ! Post Regulation for Switching Power Supplies W W W. Microsemi .COM 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 CTRL ≥ V OUT + 1.3V Max V C T RL OUTPUT 3 V OU T LX8580A V PW R ≥ V OUT + V DROPOUT 5 V PW R SENSE ADJUST 1 R1 2 RL VOUT = VREF 1 + 0 to 125 R2 + I ADJ × R 2 R 1 DROPOUT VOLTAGE 0.1V – 0.7V P PACKAGE ORDER INFO Plastic TO-220 S-PAK DF 5-pin 5-Pin LX8580ACP LX8580ACDF LX8580A TA (°°C) R2 Plastic TO-263 5-PIN LX8580ACDD DD Note: Available in Tape & Reel. Append the letter “T” to the part number. (i.e. LX8580ACDDT) Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 A LINFINITY M I C R O S E M I LX8580A 7.5A Very Low Dropout Positive Regulator C O M P A N Y P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT TAB is G N D 5 VPW R 4 V C TRL 3 OUTPUT 2 ADJUS T 1 SE NSE P P ACKAGE (5-P IN ) (Top View) 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 GND THERMAL DATA P Plastic TO-220 5-Pin THERMAL RESISTANCE-JUNCTION TO T AB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 3.0°°C/W 65°°C/W DD Plastic TO-263 5-Pin THERMAL RESISTANCE-JUNCTION TO T AB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA DF 5 V PW R 4 V CTRL 3 OUTPUT 2 ADJUST 1 SENSE W W W. Microsemi .COM 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 Lead Temperature (Soldering 180 seconds) .................................................300°C DD P ACKAG E (5-P IN ) (Top View) TAB is G N D 3.0°°C/W 35°°C/W Plastic S-Pack 5-Pin 5 VPW R 4 V CTR L 3 OU TPUT 2 ADJUST 1 SENSE DF P A CK AG E (T op View) THERMAL RESISTANCE-JUNCTION TO T AB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 3.0°C/W 35°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). θJA assume device is mounted on a 0.5 inch2 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. FUNCTIONAL PIN DESCRIPTION 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 where FR is the ripple frequency and R1 is the value of the resistor between the ADJUST and SENSE leads of the LX8580A This is the regulated power output of the device 3 OUTPUT 4 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. For the device to regulate, the voltage at this pin must be between 1.0V and 1.3V greater that the output voltage. 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). 5 Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 PACKAGE DATA 1 C R ≤ π ⋅ FR ⋅ R1 2 ADJUST A LINFINITY M I C R O S E M I C O M P A N Y LX8580A 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Parameter Symbol Test Conditions VCTRL = 2.75V, VPWR = 2V, ILOAD = 10mA, TA=25°C Reference Voltage VREF ∆VREF(VIN) Line Regulation Load Regulation ∆VREF(IOUT) Thermal Regulation Thermal Resistance ∆VOUT(Pwr) RθJT Ripple Rejection VCTRL Pin Current (Note 2) ICTRL Adjust Pin Current IADJ Current Limit IOUT(MAX) Dropout Voltage (Control Section) Minimum VCTRL (Note 1) (VPWR - VOUT) VCTRL-VOUT Dropout Voltage (Power Section) Minimum VPWR (Note 1) (VPWR - VOUT) (VADJ = 0) VPWR-VOUT LX8580A Typ Max Units 1.243 1.250 1.257 1.237 1.250 1.263 1.237 1.250 1.263 1 3 mV 2 6 mV 2 7 mV 0.002 0.65 0.020 2.70 %/W °C/W 60 80 V dB 3 30 33 70 10 50 55 120 mA 20 60 100 µA 7.7 9 A 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 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. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS Minimum Load Current 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, ∆VOUT = 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 W W W. Microsemi .COM 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. A LINFINITY M I C R O S E M I LX8580A 7.5A Very Low Dropout Positive Regulator C O M P A N Y P RODUCTION D ATA S HEET SIMPLIFIED BLOCK DIAGRAM W W W. Microsemi .COM V CT RL V PW R Current Limiting Amplifier OUTPUT Thermal Overload Voltage Regulation Amplifier SENSE V REF ADJUST TYPICAL APPLICATION 5.0V Tantalum 33µF V CT RL V O UT = 2.8V OUTPUT VO U T = VR E F 1 + SENSE LX8580A R1 + I AD J × R 2 R 2 R1 BLOCK DIAGRAM 500µF 3.3V R 1 = 121 Ω V PW R ADJUST R2 R 2 = 150 Ω Tantalum 100µF Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 A LINFINITY M I C R O S E M I LX8580A 7.5A Very Low Dropout Positive Regulator C O M P A N Y P RODUCTION D ATA S HEET Reference Voltage vs. Temperature Output Voltage Deviation(%) Load Regulation vs. Output Current 1.2530 V REF(VOLTS) 1.2525 1.2520 1.2515 1.2510 1.2505 1.2500 0 25 50 75 100 W W W. Microsemi .COM CHARACTERISTIC CURVES 0.20 0.15 0.10 0.05 0.00 0 125 1 2 TJ (°C) 3 4 5 6 7 8 Output Current (A) VCTRL Dropout, VPWR=3.25V VPWR Dropout Voltage vs. IOUT 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) Transient Response Ripple Rejection 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. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 A LINFINITY M I C R O S E M I LX8580A 7.5A Very Low Dropout Positive Regulator C O M P A N Y P RODUCTION D ATA S HEET P W W W. Microsemi .COM PACKAGE DIMENSIONS 5-Pin Plastic TO-220 B Dim S F T A B C D F G J K N R S T A 1 C 5 R K D J G N DD 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° 5-Pin Plastic TO-263 I A D Dim C B K M N H 0° -8° E G MECHANICALS F A B C D E F G H I J K M N J Seating Plane Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 A LINFINITY M I C R O S E M I C O M P A N Y LX8580A 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET DF W W W. Microsemi .COM PACKAGE DIMENSIONS 5-Pin Plastic S-Pak A C Dim A B C D E F G H I J K B K H J G F E I D MILLIMETERS MIN MAX 9.27 9.52 7.87 8.13 1.78 2.03 2.80 3.10 1.50 1.75 0.63 0.79 1.70 BSC 0.79 1.04 6.50 BSC 0.03 0.13 10.41 10.67 INCHES MIN MAX 0.365 0.375 0.310 0.320 0.070 0.080 0.110 0.122 0.059 0.069 0.025 0.031 0.067 BSC 0.031 0.041 0.256 BSC 0.001 0.005 0.410 0.420 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. MECHANICALS Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 A LINFINITY M I C R O S E M I C O M P A N Y LX8580A 7.5A Very Low Dropout Positive Regulator P RODUCTION D ATA S HEET W W W. Microsemi .COM NOTES NOTES PRELIMINARY DATA – Information contained in this document is pre-production data and is proprietary to LinFinity. It may not be modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only and LinFinity reserves the right to change or discontinue this proposed product at any time. Copyright 2001 Rev. 1.0, 2001-07-16 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8