Microsemi Corporation LX8585A-15CP, LX8585A-15CDD, LX8585-33CP, LX8585-33CDD, LX8585-15CP Datasheet
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LIN DOC #:
8585
LX8585-xx/8585A-xx
4.6A LOW D
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX8585/85A Series ICs are low dropout three-terminal regulators with a minimum of 4.6A output current. Pentium
Processor and Power PCTM applications
requiring fast transient response are ideally suited for this product family. The
LX8585A is guaranteed to have < 1.2V
at 4.6A, while the LX8585 are specified
for 1.4V, 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 4.6A to
ensure adequate output current and con-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
THE APPLICATION OF THE LX8585A & LX1431 IN A
75 & 166MHZ P54C PROCESSORS USING 5V CACHE
V
1
3
23
OUT
250pF
2
+V+V+
V
LX1431
SGND FGND
1k
COL
Ω
0.01µF
1k
Ω
1
8
REF
2.84k
65
220µF
10V
Low ESR
from
Sanyo
V
IN
LX8585A
ADJ
0.1µF
50V
5V
trolled short-circuit current. On-chip
thermal limiting provides protection
®
against any possible overload that would
create excessive junction temperatures.
The LX8585/85A family is available in
both through-hole and surface-mount
versions of the industry standard 3-pin
TO-220 / TO-263 power packages.
The LX1431 Programmable Reference
and LX8585A Series products offer precision output voltage and are ideal for
use in VRE applications (see application
below). For higher current applications,
see the LX8584 data sheet.
0.1%
Ω
330µF, 6.3V
Low ESR
Oscon Type
from Sanyo
1k
0.1%
VO 4.6A
(See Table Below)
2x
21k
1%
JP1
PLACE IN µP SOCKET CAVITY
100µF x 6
AVX TYPE
1µF x 10
SMD
10V
TPS
ROPOUT POSITIVE REGULATORS
P RODUCTION DAT A SHEET
■ THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
GUARANTEED < 1.2V HEADROOM AT 4.6A
■
(LX8585A)
■
GUARANTEED < 1.4V HEADROOM AT 4.6A
(LX8585)
■ GUARANTEED < 1.3V HEADROOM AT 3A
■ OUTPUT CURRENT OF 4.6A MINIMUM
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
ACCURACY
p OUTPUT SHORT CIRCUIT PROTECTION
p BUILT-IN THERMAL SHUTDOWN
APPLICATIONS
■ PENTIUM PROCESSOR SUPPLIES
■ POWER PC SUPPLIES
■ MICROPROCESSOR SUPPLIES
■ LOW VOLTAGE LOGIC SUPPLIES
■ BATTERY POWERED CIRCUIT
■ POST REGULATOR FOR SWITCHING SUPPLY
®
6x86TM SUPPLIES
TM
SUPPLIES
Output
Voltage
Please contact factory for details.
µP
Load
■ CYRIX
■ AMD-K5
AVAILABLE OPTIONS PER PART #
Part #
LX8585/85A-00 Adjustable
LX8585/85A-15 1.5V
LX8585/85A-33 3.3V
Other voltage options may be available —
Thick traces represent high current traces which must be low resistance / low
inductance traces in order to achieve good transient response.
Copyright © 1997
Rev. 2.2 12/97
V
OUT
JP1 TYPICAL APPLICATION
3.50 Short 120/166MHz, VRE, 5V Cache
3.38 Open 75/90/100/133MHz, STND, 5V Cache
PACKAGE ORDER INFORMATION
T
(°C)
A
Dropout
Voltage
Plastic TO-220
P
3-pin
Plastic T0-263
DD
3-pin
0 to 125 1.4V LX8585-xxCP LX8585-xxCDD
1.2V LX8585A-xxCP LX8585A-xxCDD
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8585A-00CDDT)
"xx" refers to output voltage, please see table above.
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX8585-xx/8585A-xx
4.6A LOW D
RODUCTION DATA SHEET
P
ROPOUT POSITIVE REGULATORS
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation .................................................................................. Internally Limited
Input Voltage................................................................................................................ 10V
Input to Output Voltage Differential ........................................................................... 10V
Operating Junction Temperature
Plastic (P, DD 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: TJ = TA + (P
thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
can be improved with package soldered to 0.5IN2 copper area over backside ground
* θ
JA
plane or internal power plane. θ
mounting technique.
can vary from 20ºC/W to > 40ºC/W depending on
JA
θθ
θ
θθ
JT
θθ
θ
θθ
JA
θθ
θ
θθ
JT
θθ
θ
θθ
JA
x θJA). The θ
D
3.0°C/W
60°C/W
3.0°C/W
60°C/W*
numbers are guidelines for the
JA
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
2
1
V
IN
V
OUT
ADJ / GND*
V
IN
V
OUT
ADJ / GND*
2
Copyright © 1997
Rev. 2.2 12/97
PRODUCT DATABOOK 1996/1997
LX8585-xx/8585A-xx
4.6A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8585-xxC/85A-xxC with 0°C ≤ TA ≤ 125°C;
VIN - V
LX8585-00 / 8585A-00 (Adjustable)
= 3V; I
OUT
Reference Voltage LX8585/85A V
= 4.6A. 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
Line Regulation (Note 2)
Load Regulation (Note 2)
Thermal Regulation
∆V
∆V
∆V
(VIN)
I
REF
)
VIN - V
REF(IOUT
(Pwr)
TA = 25°C, 20ms pulse
OUT
Ripple Rejection (Note 3) V
C
Adjust Pin Current I
Adjust Pin Current Change ∆I
ADJ
ADJ
10mA ≤ I
Dropout Voltage LX8585 ∆V ∆V
∆V
LX8585A ∆V
Minimum Load Current I
Maximum Output Current (Note 4) I
Temperature Stability (Note 3) ∆V
Long Term Stability (Note 3) ∆V
RMS Output Noise (% of V
) (Note 3) V
OUT
OUT(MIN)VIN
OUT(MAX)
OUT (RMS)TA
1.4V ≤ (V
(t)
OUT
(t) TA = 125°C, 1000 hrs
OUT
Test Conditions Units
= 10mA, TA = 25°C
≤ 4.6A, 1.5V ≤ (V
OUT
= 10mA, 1.5V ≤ (V
OUT
= 3V, 10mA ≤ I
OUT
= 3.3V, f =120Hz, C
OUT
= 10µF, TA = 25°C, I
ADJ
≤ 4.6A, 1.5V ≤ (V
OUT
= 1%, I
REF
REF
REF
= 1%, I
= 1%, I
OUT
OUT
OUT
≤ 7V
- V
IN
OUT
= 125°C, 10Hz £ f £ 10kHz
= 4.6A
= 3A
= 4.6A
), V
IN
- V
IN
≤ 7V
OUT
- V
), V
IN
OUT
≤ 7V
≤ 7V, P ≤ P
IN
OUT
IN
), V
≤ 4.6A
= 100µf Tantalum, VIN = 5V
OUT
= 4.6A
OUT
- V
), V
OUT
IN
≤ 7V
IN
MAX
LX8585/85A-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
60 83 dB
55 100 µA
0.2 5 µA
1.2 1.4 V
1.1 1.3 V
1.1 1.2 V
210mA
4.6 6 A
0.25 %
0.3 1 %
0.003 %
LX8585-15 / 8585A-15 (1.5V Fixed)
Parameter
Output Voltage (Note 4) V
Line Regulation (Note 2) ∆V
Load Regulation (Note 2)
Thermal Regulation (Note 3)
Ripple Rejection (Note 3) C
Quiescent Current I
Dropout Voltage LX8585-15 ∆V ∆V
LX8585A-15 ∆V
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
OUT
OUT (RMS)TA
= 5V, I
4.75V ≤ V
4.75V ≤ VIN ≤ 7V
OUT
)
4.75V ≤ V
IN
)
V
(Pwr)
TA = 25°C, 20ms pulse
0mA ≤ I
Q
∆V
OUT
IN
IN
= 5V, 10mA ≤ I
IN
= 100µF (Tantalum), I
OUT
OUT
= 1%, I
OUT
= 1%, I
OUT
= 1%, I
OUT
(T)
(t) TA = 125°C, 1000 hours
= 25°C, 10Hz ≤ f ≤ 10kHz
Test Conditions Units
= 0mA, TA = 25°C
≤ 10V, 0mA ≤ I
≤ 10V
≤ I
OUT
OUT (MAX)
≤ I
, 4.75V ≤ VIN ≤ 10V
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ 3A, V
OUT
≤ I
OUT
OUT (MAX)
IN
≤ 7A, TA = 25°C, P ≤ P
OUT
= 4.6A, TA = 25°C
OUT
, VIN - V
- V
, VIN - V
OUT
OUT
≤ 7V
OUT
≤ 7V
≤ 7V
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.
Note 4. I
is measured under the condition that V
OUT (MAX)
is forced below its nominal value by 100mV.
OUT
LX8585/85A-15
Min. Typ. Max.
1.485 1.50 1.515 V
1.470 1.50 1.530 V
13mV
15mV
2.5 7 mV
0.01 0.02 % / W
65 83 dB
410mA
1.2 1.4 V
1.1 1.3 V
1.1 1.2 V
0.25 %
0.3 1 %
0.003 %
Copyright © 1997
Rev. 2.2 12/97
3
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