LMS1585A/LMS1587 5A and 3A Low Dropout Fast Response Regulators General Description Features The LMS1585A and LMS1587 are low dropout positive regulators with output load current of 5A and 3A respectively. Their low dropout voltage (1.2V) and fast transient response make them an excellent solution for low voltage microprocessor applications. The LMS1585A/87 are available in adjustable versions, which can set the output voltage with only two external resistors. In addition, they are also available in 1.5V and 3.3V fixed voltage versions (Note 9). n n n n n n n n The LMS1585A/87 circuits include a zener trimmed bandgap reference, current limiting and thermal shutdown. The LMS1585A/87 series are available in TO-220 and TO263 packages. Applications n n n n Fast transient response Available in Adjustable, 1.5V, and 3.3V versions Current limiting and thermal protection Commercial temp. range 0˚C to 125˚C Industrial temp. range −40˚C to 125˚C Line regulation 0.005% (typical) Load regulation 0.05% (typical) Direct replacement for LT™1585A/87 Pentium™ processor supplies PowerPC™ supplies Other microprocessor supplies Low voltage logic supplies Typical Application 10119701 Connection Diagrams TO-220 TO-263 10119736 Top View 10119735 Top View LT is a registered trademark of Linear Technology Corporation Pentium is a registered trademark of Intel Corporation PowerPC is a registred trademark of IBM © 2005 National Semiconductor Corporation DS101197 www.national.com LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators June 2005 LMS1585A/LMS1587 Ordering Information Output Current Package 3A TO-263 Temperature Range 0˚C to 125˚C −40˚C to 125˚C TO-220 0˚C to 125˚C −40˚C to 125˚C 5A TO-263 0˚C to 125˚C −40˚C to 125˚C TO-220 0˚C to 125˚C −40˚C to 125˚C www.national.com Part Number Transport Media LMS1587CS-ADJ Rails LMS1587CSX-ADJ Tape and Reel LMS1587CS-1.5 Rails LMS1587CSX-1.5 Tape and Reel LMS1587CS-3.3 Rails LMS1587CSX-3.3 Tape and Reel LMS1587IS-ADJ Rails LMS1587ISX-ADJ Tape and Reel LMS1587IS-1.5 Rails LMS1587ISX-1.5 Tape and Reel LMS1587IS-3.3 Rails LMS1587ISX-3.3 Tape and Reel LMS1587CT-ADJ Rails LMS1587CT-1.5 Rails LMS1587CT-3.3 Rails LMS1587IT-ADJ Rails LMS1587IT-1.5 Rails LMS1587IT-3.3 Rails LMS1585ACS-ADJ Rails LMS1585ACSX-ADJ Tape and Reel LMS1585ACS-1.5 Rails LMS1585ACSX-1.5 Tape and Reel LMS1585ACS-3.3 Rails LMS1585ACSX-3.3 Tape and Reel LMS1585AIS-ADJ Rails LMS1585AISX-ADJ Tape and Reel LMS1585AIS-1.5 Rails LMS1585AISX-1.5 Tape and Reel LMS1585AIS-3.3 Rails LMS1585AISX-3.3 Tape and Reel LMS1585ACT-ADJ Rails LMS1585ACT-1.5 Rails LMS1585ACT-3.3 Rails LMS1585AIT-ADJ Rails LMS1585AIT-1.5 Rails LMS1585AIT-3.3 Rails 2 NSC Drawing TS3B T03B TS3B T03B LMS1585A/LMS1587 Simplified Schematic 10119714 3 www.national.com LMS1585A/LMS1587 Absolute Maximum Ratings (Note 1) Power Dissipation (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Maximum Input to Output Voltage (VIN to GND) Internally Limited Junction Temperature (TJ) (Note 2) 150˚C -65˚C to 150˚C Lead Temperature 260˚C, 10 sec ESD Tolerance (Note 3) 2000V 13V Electrical Characteristics Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junction temperature range for operation, 0˚C to 125˚C for commercial grade and −40˚C to 125˚C for industrial grade. Symbol VREF VOUT ∆VOUT ∆VOUT Parameter Reference Voltage Output Voltage Line Regulation (Note 6) Load Regulation (Note 6) VIN−VOUT Dropout Voltage www.national.com Min (Note 5) Typ (Note 4) Max (Note 5) Units LMS1585A-ADJ VIN−VOUT = 3V, IOUT = 10mA 10mA ≤ IOUT ≤ 5A, 1.5V ≤ VIN−VOUT ≤ 5.75V 1.238 1.225 1.25 1.250 1.262 1.275 V V LMS1587-ADJ 10mA ≤ IOUT ≤ 3A, 1.5V ≤ VIN−VOUT ≤ 5.75V 1.225 1.250 1.275 V LMS1585A-1.5 IOUT = 0mA, VIN = 5V 0 ≤ IOUT ≤ 5A, 3V ≤ VIN ≤ 7V 1.485 1.470 1.500 1.515 1.530 V V LMS1585A-3.3 IOUT = 0mA, VIN = 5V 0 ≤ IOUT ≤ 5A, 4.75V ≤ VIN ≤ 7V 3.267 3.235 3.300 3.300 3.333 3.365 V V LMS1587-1.5 VIN = 5V, IOUT = 0mA, TJ = 25˚C 0≤ IOUT ≤ 3A, 3V ≤ VIN ≤ 7V 1.485 1.470 1.500 1.500 1.515 1.530 V V LMS1587-3.3 0 ≤ IOUT ≤ 3A, 4.75V ≤ VIN ≤ 7V 3.235 3.300 3.365 V LMS1585A/87-ADJ IOUT = 10mA, 2.75V ≤ VIN ≤ 7V 0.005 0.2 % LMS1585A/87-3.3 IOUT = 0mA, 4.75V ≤ VIN ≤ 7V 0.005 0.2 % LMS1585A/87-1.5 IOUT = 0mA, 3V ≤ VIN ≤ 7V 0.005 0.2 % LMS1585A-ADJ VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 5A 0.3 0.5 % 0.05 LMS1585A-1.5/LMS1585A-3.3 VIN = 5V, 0 ≤ IOUT ≤ 5A 0.05 0.05 0.3 0.5 % LMS1587-ADJ VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 3A 0.05 0.05 0.3 0.5 % LMS1587-1.5/LMS1587-3.3 VIN = 5V, 0 ≤ IOUT ≤ 3A 0.05 0.05 0.3 0.5 % % LMS1585A-ADJ/LMS1587-ADJ ∆VREF = 1%, IOUT = 3A 1.15 1.3 V LMS1585A-3.3/LMS1587-3.3/ LMS1585A-1.5/LMS1587-1.5 ∆VOUT = 1%, IOUT = 3A 1.15 1.3 V LMS1585A-ADJ ∆VREF = 1%, IOUT = 5A 1.2 1.4 V LMS1585A-1.5/LMS1585A-3.3 ∆VOUT = 1%, IOUT = 5A 1.2 1.4 V Conditions 4 (Continued) Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junction temperature range for operation, 0˚C to 125˚C for commercial grade and −40˚C to 125˚C for industrial grade. Symbol ILIMIT Min (Note 5) Typ (Note 4) LMS1585A-ADJ/LMS1585A-3.3/LMS1585A-1.5 VIN−VOUT = 5.5V 5.0 6.6 A LMS1587-ADJ/LMS1587-3.3/LMS1587-1.5 VIN−VOUT = 5.5V 3.1 4.3 A Parameter Current Limit Conditions Max (Note 5) Units Minimum Load Current (Note 7) LMS1585A/87-ADJ 1.5V ≤ VIN−VOUT ≤ 5.75V 2.0 10.0 mA Quiescent Current LMS1585A-3.3/LMS1587-3.3/ LMS1585A-1.5/LMS1587-1.5 VIN = 5V 7.0 13.0 mA Thermal Regulation TA = 25˚C, 30ms Pulse Ripple Rejection LMS1585A-ADJ fRIPPLE = 120Hz, VIN−VOUT = 3V, IOUT = 5A, COUT = 25µF Tantalum LMS1585A-1.5 fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 5A, VIN = 4.5V 72 dB 72 dB 72 dB LMS1587-ADJ fRIPPLE = 120Hz, VIN−VOUT = 3V, IOUT = 3A COUT = 25µF Tantalum 72 dB 72 dB 72 dB LMS1587-3.3 fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 3A, VIN = 6.3V Adjust Pin Current Adjust Pin Current %/W LMS1585A-3.3 fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 5A, VIN = 6.3V LMS1587-1.5 fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 3A, VIN = 4.5V 60 0.003 60 55 10mA ≤ IOUT ≤ IFULLLOAD, 1.5V ≤ VIN−VOUT ≤ 5.75V (Note 8) Temperature Stability 120 µA 0.2 µA 0.5 % Long Term Stability TA = 125˚C, 1000Hrs 0.03 % RMS Output Noise (% of VOUT) 10Hz ≤ f ≤ 10kHz 0.003 % Thermal Resistance Junction-to-Case 3-Lead TO-263: Control/Output Section 3-Lead TO-220: Control/Output Section 0.65/2.7 0.65/2.7 ˚C/W ˚C/W Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Note 3: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF. Note 4: Typical Values represent the most likely parametric norm. Note 5: All limits are guaranteed by testing or statistical analysis. Note 6: Load and line regulation are measured at constant junction temperature, and are guaranteed up to the maximum power dissipation of 30W. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 7: The minimum output current required to maintain regulation. Note 8: IFULLLOAD is 5A for LMS1585A and 3A for LMS1587. Note 9: Consult factory for other fixed voltage options. 5 www.national.com LMS1585A/LMS1587 Electrical Characteristics LMS1585A/LMS1587 Application Note OUTPUT VOLTAGE The adjustable version develops at 1.25V reference voltage, (VREF), between the output and the adjust terminal. As shown in Figure 1, this voltage is applied across resistor R1 to generate a constant current I1. This constant current then flows through R2. The resulting voltage drop across R2 adds to the reference voltage to sets the desired output voltage. The current IADJ from the adjustment terminal introduces an output error. But since it is small (120µA max), it becomes negligible when R1 is in the 100Ω range. For fixed voltage devices, R1 and R2 are integrated inside the devices. 10119772 FIGURE 1. Basic Adjustable Regulator www.national.com 6 LMS1585A/LMS1587 Physical Dimensions inches (millimeters) unless otherwise noted 3-Pin TO-263 NS Package Number TS3B 3-Pin TO-220 NS Package Number T03B 7 www.national.com LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators Notes National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. Leadfree products are RoHS compliant. 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