LIN D O C # : 8587
LX8587-xx/8587A-xx
3 A L O W D R O P O U T P O S I T I V E R E G U L AT O R S
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N N O VAT I O N
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RODUCTION
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HEET
DESCRIPTION The LX8587/8587A series ICs are low dropout three-terminal positive regulators with a nominal 3A output current. Pentium® Processor and Power PCTM applications requiring fast transient response are ideally suited for this product family. The LX8587A is guaranteed to have < 1.2V dropout at 3A and the LX8587 < 1.3V at the same current, 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 3.1A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload conditions that would create excessive junction temperatures. The LX8587/87A family of products are available in both TO-220 through-hole as well as TO-263 surface-mount packages. For higher current applications, see the LX8585 and LX8584 data sheets.
K E Y F E AT U R E S
s Three-Terminal Adjustable Or Fixed Output s Guaranteed ≤ 1.2V Headroom At 3A (LX8587A) s Guaranteed ≤ 1.3V Headroom At 3A (LX8587) s Output Current Of 3A p Fast Transient Response p 1% Voltage Reference Initial Accuracy p Output Short Circuit Protection p Built-In Thermal Shutdown
APPLICATIONS
s s s s s s s s Pentium Processor Supplies Power PC Supplies Microprocessor Supplies Low Voltage Logic Supplies Post Regulator For Switching Supply ASIC & Low Voltage Chipset Supplies Graphics & Sound Cards Processor I/O Supply
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
TYPICAL APPLICATION OF THE LX8587/87A IN
A
5V TO 3.3V MOTHERBOARD APPLICATION
VIN ³ 4.75 1500µF 6MV1500GX
LX8587A
121W
3.3V/3A 2x 1500µF Sanyo 6MV1500GX
A VA I L A B L E O P T I O N S
Part #
LX8587/87A-00 LX8587/87A-15 LX8587/87A-33
PER
PAR T #
200W
Output Voltage
Adjustable 1.5V 3.3V
The output capacitors must be low ESR and low ESL type for good transient response.
Other voltage options may be available — Please contact factory for details.
PA C K A G E O R D E R I N F O R M AT I O N Dropout TA (°C) P Plastic TO-220 DD Plastic TO-263 Voltage 3-pin 3-pin 0 to 125 1.3V 1.2V LX8587-xxCP LX8587A-xxCP LX8587-xxCDD LX8587A-xxCDD
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8587A-00CDDT) "xx" refers to output voltage, please see table above.
Copyright © 1998 Rev. 1.2 3/98
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3 A L O W D R O P O U T P O S I T I V E R E G U L AT O R S
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
TAB IS VOUT
3 2 1
Power Dissipation ................................................................................ Internally Limited Input Voltage ............................................................................................................... 10V Input to Output Voltage Differential .......................................................................... 10V Maximum Output Current ............................................................................................. 5A Operating Junction Temperature Plastic (P Package) ............................................................................................... 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................ 300°C
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.
VIN VOUT ADJ / GND*
P PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions.
T H E R M A L D ATA
P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA DD PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 3.0°C/W 60°C/W* 3.0°C/W 60°C/W
TAB IS V OUT
3 2 1
VIN V OUT ADJ / GND*
DD PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions.
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. * With package soldered to 0.5 in. 2 copper area over back-side ground plane or internal power plane, θJA can vary from 20°C/W to 40°C/W, depending on mounting technique.
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Copyright © 1998 Rev. 1.2 3/98
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3 A L O W D R O P O U T P O S I T I V E R E G U L AT O R S
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8587-xx/87A-xx with 0°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
LX8587-00/87A-00 (Adjustable)
Parameter
Reference Voltage
Symbol
V REF
Test Conditions
LX8587/87A-00 Min. Typ. Max.
1.238 1.225 1.250 1.250 0.035 0.1 0.01 83 55 0.2 1.1 1 2 5 0.25 0.003 1.262 1.275 0.2 0.5 0.02
Units
V V % % %/W dB µA µA V V mA A % % %
IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ 3A, 1.5V ≤ (V IN - V OUT), V IN ≤ 7V, P ≤ PMAX Line Regulation (Note 2) ∆VREF (VIN) IOUT = 10mA, 1.5V ≤ (VIN - V OUT), V IN ≤ 7V Load Regulation (Note 2) ∆VREF (IOUT) VIN - VOUT = 3V, 10mA ≤ I OUT ≤ 3A ∆V OUT (Pwr) TA = 25°C, 20ms pulse Thermal Regulation Ripple Rejection (Note 3) VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V CADJ = 10µF, IOUT = 3A Adjust Pin Current IADJ Adjust Pin Current Change ∆IADJ 10mA ≤ IOUT ≤ 3A, 1.5V ≤ (VIN - V OUT), V IN ≤ 7V Dropout Voltage LX8587-00 ∆V ∆VREF = 1%, IOUT = 3A LX8587A-00 ∆VREF = 1%, IOUT = 3A Minimum Load Current IOUT(MIN) VIN ≤ 7V Maximum Output Current IOUT(MAX) 1.4V ≤ (VIN - VOUT ), VIN ≤ 7V Temperature Stability ∆VOUT (T) Long Term Stability ∆VOUT (t) TA = 125°C, 1000 hrs VOUT (RMS) TA = 25°C, 10Hz £ f £ 10kHz RMS Output Noise (% of VOUT)
65
100 5 1.3 1.2 10
3.0
1
LX8587-15/87A-15 (1.5V Fixed)
Parameter
Output Voltage
Symbol
VOUT
Test Conditions
LX8587-15/87A-15 Min. Typ. Max.
1.485 1.470 1.5 1.5 1 2 5 0.01 75 4 1.1 1 5.0 0.25 0.3 0.003 1.515 1.530 6 10 7.5 0.02 10 1.3 1.2
Units
V V mV mV mV %/W dB mA V V A % % %
VIN = 5V, IOUT = 0mA, TA = 25°C 3.0V ≤ V IN ≤ 7V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX Line Regulation (Note 2) ∆VOUT 4.75V ≤ V IN ≤ 7V (VIN ) 4.75V ≤ VIN ≤ 10V Load Regulation (Note 2) ∆VOUT (IOUT) VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX) Thermal Regulation (Note 3) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 3A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8587-15 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) LX8587A-15 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) Maximum Output Current IOUT (MAX) VIN ≤ 7V Temperature Stability (Note 3) ∆VOUT (T) Long Term Stability (Note 3) ∆VOUT (t) TA = 125°C, 1000 hours RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
60
3.0
1
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 regulation. Note 3. These parameters, although guaranteed, are not tested in production.
Copyright © 1998 Rev. 1.2 3/98
3
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3 A L O W D R O P O U T P O S I T I V E R E G U L AT O R S
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
LX8587-33/87A-33 (3.3V Fixed)
Parameter
Output Voltage
Symbol
VOUT
Test Conditions
LX8587-33/87A-33 Min. Typ. Max.
3.267 3.235 3.3 3.3 1 2 5 0.01 75 4 1.1 1 5.0 0.25 0.3 0.003 3.333 3.365 6 10 15 0.02 10 1.3 1.2
Units
V V mV mV mV %/W dB mA V V A % % %
VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX Line Regulation (Note 2) ∆VOUT 4.75V ≤ VIN ≤ 7V (VIN ) 4.75V ≤ VIN ≤ 10V ∆VOUT (IOUT) VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX) Load Regulation (Note 2) Thermal Regulation (Note 3) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 3A 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Quiescent Current IQ Dropout Voltage LX8587-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) LX8587A-33 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) Maximum Output Current IOUT (MAX) VIN ≤ 7V Temperature Stability (Note 3) ∆VOUT (T) Long Term Stability (Note 3) ∆VOUT (t) TA = 125°C, 1000 hours RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
60
3.0
1
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 regulation. Note 3. These parameters, although guaranteed, are not tested in production.
4
Copyright © 1998 Rev. 1.2 3/98
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3 A L O W D R O P O U T P O S I T I V E R E G U L AT O R S
P
RODUCTION
D
ATA
S
HEET
A P P L I C AT I O N N O T E S The LX8587/87A series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection 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 LX8587/87A 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. RECOMMENDED CAPACITOR VALUES INPUT
10µF 10µF
Power Supply IN
LX8587/87A
ADJ
OUT
Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON
