Microsemi Corporation LX8587-33CP, LX8587-33CDD, LX8587-15CP, LX8587-15CDD, LX8587A-15CP Datasheet
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LIN DOC #:
8587
LX8587-xx/8587A-xx
3A LOW D
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX8587/8587A series ICs are low
dropout three-terminal positive regulators
with a nominal 3A output current. Pen-
®
tium
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.
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
V
³ 4.75 3.3V/3A
IN
LX8587A
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.
ROPOUT POSITIVE REGULATORS
P RODUCTION DAT A SHEET
■ Three-Terminal Adjustable Or Fixed
Output
■ Guaranteed
(LX8587A)
■ Guaranteed
(LX8587)
■ Output Current Of 3A
p Fast Transient Response
p 1% Voltage Reference Initial Accuracy
p Output Short Circuit Protection
p Built-In Thermal Shutdown
■ 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
≤≤
≤ 1.2V Headroom At 3A
≤≤
≤≤
≤ 1.3V Headroom At 3A
≤≤
APPLICATIONS
W
1500µF
6MV1500GX
W
200
The output capacitors must be low ESR and low ESL type for good transient response.
121
PACKAGE ORDER INFORMATION
T
(°C)
A
0 to 125
Note: All surface-mount packages are available in Tape & Reel.
Dropout
Voltage
1.3V LX8587-xxCP LX8587-xxCDD
1.2V LX8587A-xxCP LX8587A-xxCDD
Append the letter "T" to part number. (i.e. LX8587A-00CDDT)
"xx" refers to output voltage, please see table above.
Plastic TO-220
P
3-pin
2x 1500µF
Sanyo
6MV1500GX
DD
AVAILABLE OPTIONS PER PART #
Part #
LX8587/87A-00 Adjustable
LX8587/87A-15 1.5V
LX8587/87A-33 3.3V
Other voltage options may be available —
Please contact factory for details.
Plastic TO-263
3-pin
Output
Voltage
Copyright © 1998
Rev. 1.2 3/98
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3A LOW D
P
ROPOUT POSITIVE REGULATORS
RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 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.
THERMAL DATA
P PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: T
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
* With package soldered to 0.5 in.
power plane, θ
can vary from 20°C/W to 40°C/W, depending on mounting technique.
JA
= TA + (P
J
2
copper area over back-side ground plane or internal
θθ
θ
θθ
θθ
θ
θθ
D
JT
JT
x θ
3.0°C/W
θθ
θ
θθ
JA
60°C/W
3.0°C/W
θθ
θ
θθ
JA
).
JA
60°C/W*
PACKAGE PIN OUTS
TAB IS V
OUT
3
2
1
P PACKAGE
* Pin 1 is GND for fixed voltage versions.
* Pin 1 is GND for fixed voltage versions.
(Top View)
TAB IS V
OUT
DD PACKAGE
(Top View)
3
V
2
1
IN
V
OUT
ADJ / GND*
V
IN
V
OUT
ADJ /
GND*
2
Copyright © 1998
Rev. 1.2 3/98
PRODUCT DATABOOK 1996/1997
LX8587-xx/8587A-xx
3A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DATA SHEET
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 - V
= 3V; I
OUT
LX8587-00/87A-00 (Adjustable)
Reference Voltage V
Line Regulation (Note 2)
Load Regulation (Note 2)
Thermal Regulation
Ripple Rejection (Note 3) V
Adjust Pin Current I
Adjust Pin Current Change ∆I
Dropout Voltage LX8587-00 ∆V ∆V
Minimum Load Current I
Maximum Output Current I
Temperature Stability ∆V
Long Term Stability ∆V
RMS Output Noise (% of V
= 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
OUT
Parameter
Symbol
REFIOUT
10mA ≤ I
∆V
)
I
REF(VIN
∆V
)
VIN - V
REF(IOUT
∆V
(Pwr)
TA = 25°C, 20ms pulse
OUT
C
ADJ
10mA ≤ I
ADJ
LX8587A-00 ∆V
OUT(MIN)VIN
OUT(MAX)
)V
OUT
1.4V ≤ (V
(T)
OUT
(t) TA = 125°C, 1000 hrs
OUT
OUT (RMS)TA
Test Conditions Units
= 10mA, TA = 25°C
≤ 3A, 1.5V ≤ (V
OUT
= 10mA, 1.5V ≤ (V
OUT
= 3V, 10mA ≤ I
OUT
= 3.3V, f =120Hz, C
OUT
= 10µF, I
ADJ
= 1%, I
REF
= 1%, I
REF
OUT
≤ 3A, 1.5V ≤ (V
OUT
OUT
OUT
≤ 7V
- V
IN
OUT
= 25°C, 10Hz £ f £ 10kHz
= 3A
= 3A
= 3A
), V
≤ 7V
IN
- V
IN
- V
), V
OUT
IN
OUT
≤ 7V
), V
IN
IN
≤ 7V, P ≤ P
≤ 7V
IN
), V
OUT
≤ 3A
OUT
= 100µf Tantalum, VIN = 5V
OUT
- V
IN
MAX
LX8587/87A-00
Min. Typ. Max.
1.238 1.250 1.262 V
1.225 1.250 1.275 V
0.035 0.2 %
0.1 0.5 %
0.01 0.02 %/W
65 83 dB
55 100 µA
0.2 5 µA
1.1 1.3 V
1 1.2 V
210mA
3.0 5 A
0.25 %
1%
0.003 %
LX8587-15/87A-15 (1.5V Fixed)
Parameter
Output Voltage V
Line Regulation (Note 2) ∆V
Load Regulation (Note 2)
Thermal Regulation (Note 3)
Ripple Rejection (Note 3) C
Quiescent Current I
Dropout Voltage LX8587-15 ∆V ∆V
LX8587A-15 ∆ V
Maximum Output Current I
Temperature Stability (Note 3) ∆V
Long Term Stability (Note 3) ∆V
RMS Output Noise (% of V
) (Note 3) V
OUT
Symbol
OUTVIN
(V
∆V
OUT(IOUT
∆V
OUT
OUT (MAX)VIN
OUT
OUT
OUT (RMS)TA
= 5V, I
OUT
3.0V ≤ VIN ≤ 7V, 0mA ≤ I
4.75V ≤ VIN ≤ 7V
OUT
)
IN
4.75V ≤ VIN ≤ 10V
)
V
= 5V, 0mA ≤ I
IN
(Pwr)
TA = 25°C, 20ms pulse
= 100µF (Tantalum), I
OUT
0mA ≤ I
Q
= 1%, I
OUT
= 1%, I
OUT
OUT
≤ 7V
(T)
(t) TA = 125°C, 1000 hours
= 25°C, 10Hz ≤ f ≤ 10kHz
Test Conditions Units
= 0mA, TA = 25°C
OUT
≤ I
OUT
OUT (MAX)
≤ I
, 4.75V ≤ VIN ≤ 10V
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ 3A, P ≤ P
= 3A
OUT
MAX
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.
LX8587-15/87A-15
Min. Typ. Max.
1.485 1.5 1.515 V
1.470 1.5 1.530 V
16mV
210mV
5 7.5 mV
0.01 0.02 % / W
60 75 dB
410mA
1.1 1.3 V
1 1.2 V
3.0 5.0 A
0.25 %
0.3 1 %
0.003 %
Copyright © 1998
Rev. 1.2 3/98
3
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