Not Recommened For New Design See The LX8580A LX8580 7A V E R Y L O W D R O P O U T P O S I T I V E A D J U S T A B L E R E G U L A T O R T H E I N F I N I T E P O W E R I O F P N N O V A T I O N D R O D U C T I O N A T A S H E E T KEY FEATURES DESCRIPTION The LX8580 is a high-performance, very low of remote (Kelvin) voltage sensing. This sensing dropout voltage regulator, designed for use with compensates for output voltage variations due to advanced microprocessors. This product can be load changes and resistive voltage drops in used with separate voltage supplies for the control connectors and board traces. Typical load and power sections, allowing a power section regulation measured at the sense pin is less than dropout voltage as low as 100mV. The LX8580 1mV for a load current step of 7mA to 7A. can also be used in a single voltage supply The LX8580 is ideal for generating a configuration, with a dropout performance similar secondary 2 - 2.5V low voltage supply on a to that of the LX8584 (1.3V at 7A). motherboard where a 3.3V supply is already The LX8580 is supplied in a five terminal TOavailable. 220 package, which allows the implementation Low Dropout, 800mV Max. at 7A Output Current in Dual Supply Mode Fast Transient Response Remote Sensing 1mV Load Regulation Adjustable Output No Supply Sequencing Problems in Dual Supply Mode KEY FEATURES IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Microprocessor Supplies 3.3V to 2.5V Processor Power Supplies High-Current Regulators Post Regulators for Switching Supplies PRODUCT HIGHLIGHT Special Capabilities of the LX8580 To Allow 44% Smaller LDO Thermal Dissipation VCTRL VOUT + 1.3V Max 4 VCTRL OUTPUT 3 VOUT LX8580 VPWR VOUT + VDROPOUT 5 VPWR SENSE 1 ADJUST 2 RA LOAD VOUT ⎛ R = VREF ⎜⎜1+ B ⎝ RA TA (°C) 0 to 125 ⎞ ⎟⎟ + IADJ • RB ⎠ RB PACKAGE ORDER INFO Plastic TO-220 P 5-Pin Dropout Voltage 0.1V – 0.8V DD Plastic To-263 5-Pin RoHS Compliant Transition DC: 0543 RoHS Compliant Transition DC: 0535 LX8580-00CP LX8580-00CDD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8580-00CDD-TR) Copyright © 1999 Rev. 1.1, 2005-10-21 LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LX8580 7A V ERY L OW D ROPOUT POSITIVE A DJUSTABLE R EGULATOR P R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T PACKAGE PIN OUTS (Note 1) Power Dissipation ...................................................................................... Internally Limited VPWR Input Voltage ........................................................................................................... 7V VCTRL Input Voltage ......................................................................................................... 13V Operating Junction Temperature Plastic (P Package) ................................................................................................ 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C TAB IS OUTPUT V PWR VCTRL OUTPUT ADJUST SENSE 5 1 RoHS Peak Package Solder Reflow Temp. (40 seconds max. exposure).................... 260°C (+0, -5) Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. P PACKAGE (Top View) T H E R M A L D ATA TAB IS OUTPUT P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT 3.0°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W DD PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT 3.0°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 60°C/W 5 V PWR 4 VCTRL 3 OUTPUT 2 ADJUST 1 SENSE DD PACKAGE (Top View) RoHS 100% Matte Tin Lead Finish 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. BLOCK DIAGRAM VCTRL Control Power Current Limiting Amplifier VPWR OUTPUT Thermal Overload Voltage Regulation Amplifier 2 SENSE VREF ADJUST Copyright © 1999 Rev. 1.1 PRODUCT DATABOOK 1996/1997 LX8580 7A V ERY LOW D ROPOUT POSITIVE A DJUSTABLE R EGULATOR P R O D U C T I O N D A T A S H E E T ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures 0°C ≤ TA ≤ 125°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Reference Voltage Line Regulation Load Regulation Thermal Regulation Thermal Resistance Ripple Rejection Control Pin Current (Note 3) Adjust Pin Current Current Limit Dropout Voltage (Control Section) Minimum VCTRL (Note 2) (VPWR - VOUT) Dropout Voltage (Power Section) Minimum VPWR (Note 2) (VPWR - VOUT) (VADJ = 0) Minimum Load Current Symbol VREF Test Conditions VCTRL = 2.75V, VPWR = 2V, ILOAD = 10mA, TJ = 25°C VCTRL = 2.7V to 6V, VPWR = 1.75V to 5.5V, IOUT = 10mA to 4A VCTRL = 2.7V to 6V, VPWR = 2.05V to 5.5V, IOUT = 10mA to 7A ∆VREF (VIN) VCTRL = 2.5V to 12V, VPWR = 1.75V to 5.5V, ILOAD = 10mA, TJ = 25°C VCTRL = 2.5V to 12V, VPWR = 1.75V to 5.5V, ILOAD = 10mA ∆VREF (IOUT) VCTRL = 2.75V, VPWR = 2.1V, ILOAD = 10mA to 7A (VADJ = 0) ∆VOUT (Pwr) 30ms Pulse RθJT Control Circuitry/Power Transistor VCTRL = VPWR = 3.75V Avg, VRIPPLE = 1VP-P, VADJ = 0V, IOUT = 4A ICTRL VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 100mA VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 4A VCTRL = 2.75V, VPWR = 1.75V, ILOAD = 4A VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 7A IADJ VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 0mA (VADJ = 0) VCTRL = 2.75V, VPWR = 2.05V, ∆VOUT = 100mV (VADJ = 0) Iθ(MAX) VCTRL - VOUT VPWR = 2.05V, ILOAD = 100mA VPWR = 2.05V, ILOAD = 1A VPWR = 2.05V, ILOAD = 2.75A VPWR = 2.05V, ILOAD = 4A VPWR = 2.05V, ILOAD = 7A VPWR - VOUT VCTRL = 2.75V, ILOAD = 100mA VCTRL = 2.75V, ILOAD = 1A VCTRL = 2.75V, ILOAD = 2.75A VCTRL = 2.75V, ILOAD = 4A, TJ = 25°C VCTRL = 2.75V, ILOAD = 4A VCTRL = 2.75V, ILOAD = 7A, TJ = 25°C VCTRL = 2.75V, ILOAD = 7A VCTRL = 5V, VPWR = 3.3V, VADJ = 0V Min. 1.243 1.237 1.237 60 7.1 LX8580 Typ. Max. 1.250 1.250 1.250 1 2 2 0.002 0.65 80 3 30 33 60 60 9 0.90 1.00 1.05 1.06 1.10 0.05 0.10 0.20 0.30 0.30 0.52 0.56 5 1.257 1.263 1.263 3 6 7 0.020 2.70 10 60 70 120 120 1.15 1.15 1.18 1.20 1.30 0.17 0.22 0.38 0.40 0.50 0.62 0.80 10 Units V V V mV mV mV %/W °C/W dB mA mA mA mA µA A V V V V V V V V V V V V mA Note 2. 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 3. 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. Copyright © 1999 Rev. 1.1 3 PRODUCT DATABOOK 1996/1997 LX8580 7A V ERY L OW D ROPOUT POSITIVE A DJUSTABLE R EGULATOR P D R O D U C T I O N A T A S H E E T FUNCTIONAL PIN DESCRIPTION Pin # Description SENSE 1 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 load. ADJUST 2 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 CR ≤ 1 / 2πFRRA , where FR is the ripple frequency and RA is the value of the resistor between the output and sense leads of the LX8580. OUTPUT 3 This is the power output of the device. VCTRL 4 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 than the output voltage. VPWR 5 This is the collector of the power section of the LX8580. 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 currents require higher voltages between VPWR and OUTPUT). B A S I C A P P L I C AT I O N C I R C U I T Tantalum 33µF 10V 4 x 19 2W 5% (Parallel Connected) VCTRL 5.0V 0.259 VPWR "Electronic Heatsink" Resistor reduces thermal load on LDO heatsink to 6.9W OUTPUT LX8580 2.89 (MAX) VOUT = 2.775 2.67 (MIN) SENSE ADJUST 1219 1% 6000µF LOAD Tantalum 100µF 10V *Note 1479 1% 5A (4X Sanyo 6mV 1500GK 6.3V 1500µF) SYSTEM GROUND *Note: For improved transient response, add capacitor as shown (typical 15µF). PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. 4 Copyright © 1999 Rev. 1.1