Microsemi Corporation LX8383-00CV, LX8383-00CP, LX8383A-00IP, LX8383A-00CV, LX8383A-00CP Datasheet
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LIN DOC #:
8383
LX8383-xx/8383A-xx/8383B-xx
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX8383/8383A/8383B series ICs are
positive regulators designed to provide
7.5A output current. All internal circuitry
is designed to operate down to a 1V input-to-output differential, so the LX8383/
83A/83B can operate with greater efficiency than previously available devices.
The dropout voltage for each product is
fully specified as a function of load current. Dropout is guaranteed at a maxi-
mum of 1.3V for the LX8383A/83B and
1.5V for the LX8383, at maximum output
current, decreasing at lower load currents.
Fixed versions are also available and specified in the Available Options table below.
The LX8383B offers a tighter voltage reference tolerance: 0.8% initial accuracy and
1% over line, load and temperature. The
LX8383/83A have 1% initial accuracy and
2% over line, load and temperature.
The LX8383/83A/83B series devices are
pin-compatible with earlier 3-terminal
regulators, such as the 117 series products. While a 10µF output capacitor is
required on both input and output of these
new devices, this capacitor is generally
included in most regulator designs.
The LX8383/83A/83B series quiescent
current flows into the load, thereby
increasing efficiency. This feature
contrasts with PNP regulators, where up
to 10% of the output current is wasted as
quiescent current. The LX8383I/8383AI is
specified over the industrial temperature
range of -25°C to +125°C and the
LX8383C/8383AC/8383BC is specified
over the commercial range of 0°C to
+125°C.
PRODUCT HIGHLIGHT
3.3V, 7.5A REGULATOR
≥ 4.75V
V
IN
6MV1500GX
1500µF
6.3V
from Sanyo
IN
LX8383A
ADJ
OUT
121Ω
1%
205
1%
7.5A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DAT A SHEET
■ THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE
■ GUARANTEED < 1.3V HEADROOM AT
7.5A (LX8383A/8383B)
■ GUARANTEED < 1.5V HEADROOM AT
7.5A (LX8383)
■ OUTPUT CURRENT OF 7.5A MINIMUM
p 0.015% LINE REGULATION
p 0.15% LOAD REGULATION
■ EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
APPLICATIONS
■ PENTIUM
■ HIGH EFFICIENCY LINEAR REGULATORS
■ POST REGULATORS FOR SWITCHING
■ BATTERY CHARGERS
■ CONSTANT CURRENT REGULATORS
■ CYRIX
■ AMD-K5
AVAILABLE OPTIONS PER PART #
Part #
3.38V at 7.5A
2x 330µF, 6.3V
Oscon SA type
from Sanyo
-or3x 1500µF, 6.3V
Ω
6MV1500GX
from Sanyo
LX8383/83A/83B-00 Adjustable
LX8383/83A/83B-33 3.3V
Other voltage options may be available —
®
PROCESSOR APPLICATIONS
POWER SUPPLIES
®
TM
6x86
TM
Voltage
Please contact factory for details.
Output
Application of the LX8383A for the standard voltage (non VRE) Pentium Processor motherboard
with less than 130mV dynamic response to a 7.5A load transient.
PACKAGE ORDER INFORMATION
T
(°C)
A
Dropout
Voltage
Plastic TO-220
P
3-pin
1.5V LX8383-xxCP LX8383-xxCV
0 to 125 1.3V LX8383A-xxCP LX8383A-xxCV
1.3V LX8383B-xxCP LX8383B-xxCV
-25 to 125
1.5V LX8383-xxIP LX8383-xxIV
1.3V LX8383A-xxIP LX8383A-xxIV
"xx" refers to output voltage, please see table above.
FOR FURTHER INFORMATION CALL (714) 898-8121
Copyright © 1996
Rev. 1.0 12/96
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
Plastic TO-247
V
3-terminal
1
PRODUCT DATABOOK 1996/1997
T
LX8383-xx/8383A-xx/8383B-xx
7.5A 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 & V Packages) ....................................................................................... 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:
= TA + (P
J
θθ
θ
θθ
JT
θθ
θ
θθ
JA
θθ
θ
θθ
JT
θθ
θ
θθ
JA
x θ
).
D
JA
2.7°C/W
60°C/W
1.6°C/W
35°C/W
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
V 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.
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 ON REVERSE SIDE IS V
3
2
1
V PACKAGE
(Top View)
OUT
V
IN
V
OUT
ADJ / GND*
V
IN
V
OUT
ADJ / GND*
V
IN
ADJ or
GND*
* This pin GND for fixed voltage versions.
Bias
Circuit
Thermal
Limit Circuit
BLOCK DIAGRAM
Bandgap
Circuit
Control
Circuit
Output
Circuit
SOA Protection
Circuit
Current
Limit Circuit
V
OU
2
Copyright © 1996
Rev. 1.0 12/96
PRODUCT DATABOOK 1996/1997
LX8383-xx/8383A-xx/8383B-xx
7.5A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8383-xxC/8383A-xxC/8383B-xxC with 0°C ≤
≤ 125°C, the LX8383-xxI/8383A-xxI with -25°C ≤ TA ≤ 125°C; V
T
A
maintains junction and case temperatures equal to the ambient temperature.)
LX8383-00/83A-00/83B-00 (Adjustable)
Parameter
Reference Voltage LX8383/83A-00 V
(Note 4) 10mA ≤ I
LX8383B-00 I
Line Regulation (Note 2) ∆V
Load Regulation (Note 2) ∆V
Thermal Regulation
Ripple Rejection (Note 3) V
Adjust Pin Current I
Adjust Pin Current Change (Note 4) ∆ I
Dropout Voltage LX8383-00 ∆V ∆V
LX8383A/83B-00 ∆V
Minimum Load Current I
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
REFIOUT
(V
IN
(I
OUT
∆V
(Pwr)
OUT
ADJ
ADJ
OUT (MIN)VIN
OUT (MAX)(VIN
OUT
OUT
OUT (RMS)TA
= 10mA, TA = 25°C
= 10mA, TA = 25°C
OUT
10mA ≤ I
1.5V ≤ (V
REF
)
1.5V ≤ (V
REFVOUT
≥ V
)
VIN - V
OUT
TA = 25°C, 20ms pulse
= 5V, f =120Hz, C
OUT
C
= 10µF, I
ADJ
10mA ≤ I
= 1%, I
REF
= 1%, I
REF
≤ 10V
- V
(T)
(t) TA = 125°C, 1000 hours
= 25°C, 10Hz ≤ f ≤ 10kHz
- V
IN
≤ I
OUT
OUT (MAX)
≤ I
OUT
OUT (MAX)
- V
), V
IN
OUT
- V
), V
IN
OUT
, VIN - V
REF
OUT
= 3V, 10mA ≤ I
= 7.5A
OUT
≤ I
OUT
OUT (MAX)
= 7.5A
OUT
= 7.5A
OUT
) ≤ 7V
OUT
= 3V; I
OUT
Test Conditions Units
= 7.5A. Low duty cycle pulse testing techniques are used which
OUT
LX8383/83A/83B-00
Min. Typ. Max.
1.238 1.250 1.262 V
, 1.5V ≤ (V
- V
), V
OUT
≤ 10V, P ≤ P
IN
MAX
IN
1.225 1.250 1.270 V
1.240 1.250 1.260 V
, 1.5V ≤ (V
≤ 7V
IN
≤ 10V
IN
= 3V, 10mA ≤ I
OUT
≤ 7.5A
- V
IN
), V
OUT
≤ 7.5A, T
OUT
≤ 10V, P ≤ P
IN
= 25°C
A
MAX
1.238 1.250 1.262 V
0.015 0.2 %
0.035 0.3 %
0.15 0.4 %
0.3 0.5 %
0.01 0.02 %/W
= 100µf Tantalum, VIN = 6.5V
OUT
65 83 dB
55 100 µA
, 1.5V ≤ (V
- V
), V
OUT
≤ 10V
IN
IN
0.2 5 µA
1.2 1.5 V
1 1.3 V
210mA
7.5 9.5 A
0.25 %
0.3 1 %
0.003 %
LX8383-33/83A-33/83B-33 (3.3V Fixed)
Parameter
Output Voltage LX8383/83A-33 V
(Note 4) 4.75V ≤ V
LX8383B-33 VIN = 5V, I
Line Regulation (Note 2) ∆V
Load Regulation (Note 2)
Thermal Regulation
Ripple Rejection (Note 3) C
Quiescent Current I
Dropout Voltage LX8383-33 ∆V ∆V
LX8383A/83B-33 ∆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
4.75V ≤ VIN ≤ 10V, 0mA ≤ I
4.75V ≤ VIN ≤ 7V
OUT
)
4.75V ≤ V
IN
)
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
≤ 10V, 0mA ≤ I
IN
= 0mA, TA = 25°C
OUT
≤ 10V
IN
≤ I
≤ I
OUT
OUT (MAX)
, 4.75V ≤ VIN ≤ 10V
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ 7.5A, P ≤ P
OUT
≤ 7.5A, P ≤ P
OUT
= 7.5A
OUT
, V
≤ 7V
IN
, V
≤ 7V
IN
MAX
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. See Maximum Output Current Section above.
LX8383/83A/83B-33
Min. Typ. Max.
3.267 3.3 3.333 V
3.235 3.3 3.365 V
3.274 3.3 3.326 V
3.267 3.3 3.333 V
16mV
210mV
515mV
0.01 0.02 % / W
60 83 dB
410mA
1.5 V
1.3 V
7.5 9.5 A
0.25 1 %
0.3 %
0.003 %
Copyright © 1996
Rev. 1.0 12/96
3
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