Microsemi Corporation LX8383-00CV, LX8383-00CP, LX8383A-00IP, LX8383A-00CV, LX8383A-00CP Datasheet
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LIN D O C #: 8383 |
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LX8383-xx/8383A-xx/8383B-xx |
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7 . 5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S |
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T H E I N F I N I T E P O W E R O F I N N O V A T I O N |
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P R O D U C T I O N D A T A S H E E T |
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D E S C R I P T I O N
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 in- put-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 maximum 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.
K E Y F E AT U R E S
■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
A P P L I C AT I O N S
■PENTIUM® PROCESSOR APPLICATIONS
■HIGH EFFICIENCY LINEAR REGULATORS
■POST REGULATORS FOR SWITCHING POWER SUPPLIES
■BATTERY CHARGERS
■CONSTANT CURRENT REGULATORS
■CYRIX® 6x86TM
■AMD-K5TM
P R O D U C T H I G H L I G H T
3.3V, 7.5A RE G U L AT O R
VIN ³ 4.75V |
IN |
LX8383A |
OUT |
3.38V at 7.5A |
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1500µF |
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ADJ |
121W |
2x 330µF, 6.3V |
6.3V |
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1% |
Oscon SA type |
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6MV1500GX |
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from Sanyo |
from Sanyo |
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-or- |
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3x 1500µF, 6.3V |
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205Ω |
6MV1500GX |
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1% |
from Sanyo |
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AVA I L A B L E O P T I O N S P E R PA R T #
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Part # |
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Output |
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Voltage |
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LX8383/83A/83B-00 |
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Adjustable |
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LX8383/83A/83B-33 |
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3.3V |
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Other voltage options may be available — Please contact factory for details.
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.
Copyright © 1996
Rev. 1.0 12/96
PA C K A G E O R D E R I N F O R M AT I O N
TA (°C) |
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Dropout |
P |
Plastic TO-220 |
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V |
Plastic TO-247 |
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Voltage |
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3-pin |
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3-terminal |
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1.5V |
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LX8383-xxCP |
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LX8383-xxCV |
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0 to 125 |
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1.3V |
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LX8383A-xxCP |
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LX8383A-xxCV |
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1.3V |
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LX8383B-xxCP |
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LX8383B-xxCV |
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-25 to 125 |
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1.5V |
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LX8383-xxIP |
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LX8383-xxIV |
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1.3V |
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LX8383A-xxIP |
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LX8383A-xxIV |
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"xx" refers to output voltage, please see table above.
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841 |
1 |
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8383-xx/8383A-xx/8383B-xx
7 . 5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S
P R O D U C T I O N D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS |
(Note 1) |
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Power Dissipation .................................................................................. |
Internally Limited |
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Input Voltage ................................................................................................................ |
10V |
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Input to Output Voltage Differential ........................................................................... |
10V |
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Operating Junction Temperature |
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Plastic (P & V Packages) ....................................................................................... |
150°C |
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Storage Temperature Range ...................................................................... |
-65°C to 150°C |
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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, θJT |
2.7°C/W |
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
60°C/W |
V PACKAGE: |
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THERMAL RESISTANCE-JUNCTION TO TAB, θJT |
1.6°C/W |
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
35°C/W |
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.
PACKAGE PIN OUTS
TAB IS VOUT
3 
VIN
2 
VOUT
1 
ADJ / GND*
P PACKAGE
(Top View)
* Pin 1 is GND for fixed voltage versions.
TAB ON REVERSE SIDE IS VOUT |
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3 |
VIN |
2 |
VOUT |
1 |
ADJ / GND* |
V PACKAGE
(Top View)
* Pin 1 is GND for fixed voltage versions.
BLOCK DIAGRAM
VIN
Bias |
Circuit |
Thermal |
Bandgap |
Control |
Output |
Limit Circuit |
Circuit |
Circuit |
Circuit |
VOUT
SOA Protection
Circuit
ADJ or |
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Current |
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GND* |
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Limit Circuit |
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* This pin GND for fixed voltage versions.
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Copyright © 1996 |
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Rev. 1.0 12/96 |
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P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8383-xx/8383A-xx/8383B-xx
7 . 5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S
P R O D U C T I O N D A T A S H E E T
E L E C T R I C A L C H A R A C T E R I S T I C S
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8383-xxC/8383A-xxC/8383B-xxC with 0°C ≤ TA ≤ 125°C, the LX8383-xxI/8383A-xxI with -25°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 7.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
LX8383-00/83A-00/83B-00 (Adjustable)
Parameter |
Symbol |
Test Conditions |
LX8383/83A/83B-00 |
Units |
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Min. |
Typ. |
Max. |
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Reference Voltage |
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LX8383/83A-00 |
VREF |
IOUT = 10mA, TA = 25°C |
1.238 |
1.250 |
1.262 |
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(Note 4) |
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10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX |
1.225 |
1.250 |
1.270 |
V |
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LX8383B-00 |
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IOUT = 10mA, TA = 25°C |
1.240 |
1.250 |
1.260 |
V |
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10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX |
1.238 |
1.250 |
1.262 |
V |
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Line Regulation (Note 2) |
VREF |
1.5V ≤ (VIN - VOUT), VIN ≤ 7V |
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0.015 |
0.2 |
% |
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(VIN) |
1.5V ≤ (VIN - VOUT), VIN ≤ 10V |
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0.035 |
0.3 |
% |
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Load Regulation (Note 2) |
VREF |
VOUT ≥ VREF, VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 7.5A, TA = 25°C |
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0.15 |
0.4 |
% |
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(IOUT) |
VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 7.5A |
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0.3 |
0.5 |
% |
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Thermal Regulation |
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VOUT(Pwr) |
TA = 25°C, 20ms pulse |
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0.01 |
0.02 |
%/W |
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Ripple Rejection (Note 3) |
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VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V |
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dB |
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CADJ = 10µF, IOUT = 7.5A |
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Adjust Pin Current |
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IADJ |
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55 |
100 |
µA |
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Adjust Pin Current Change (Note 4) |
IADJ |
10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V |
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0.2 |
5 |
µA |
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Dropout Voltage |
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LX8383-00 |
V |
VREF = 1%, IOUT = 7.5A |
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1.2 |
1.5 |
V |
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LX8383A/83B-00 |
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VREF = 1%, IOUT = 7.5A |
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1 |
1.3 |
V |
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Minimum Load Current |
IOUT (MIN) |
VIN ≤ 10V |
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2 |
10 |
mA |
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Maximum Output Current |
IOUT (MAX) |
(VIN - VOUT) ≤ 7V |
7.5 |
9.5 |
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A |
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Temperature Stability (Note 3) |
VOUT (T) |
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0.25 |
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% |
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Long Term Stability |
(Note 3) |
VOUT (t) |
TA = 125°C, 1000 hours |
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0.3 |
1 |
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RMS Output Noise (% of VOUT) (Note 3) |
VOUT (RMS) |
TA = 25°C, 10Hz ≤ f ≤ 10kHz |
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0.003 |
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% |
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LX8383-33/83A-33/83B-33 (3.3V Fixed)
Parameter |
Symbol |
Test Conditions |
LX8383/83A/83B-33 |
Units |
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Min. |
Typ. |
Max. |
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Output Voltage |
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LX8383/83A-33 |
VOUT |
VIN = 5V, IOUT = 0mA, TA = 25°C |
3.267 |
3.3 |
3.333 |
V |
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(Note 4) |
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4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 7.5A, P ≤ PMAX |
3.235 |
3.3 |
3.365 |
V |
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LX8383B-33 |
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VIN = 5V, IOUT = 0mA, TA = 25°C |
3.274 |
3.3 |
3.326 |
V |
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4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 7.5A, P ≤ PMAX |
3.267 |
3.3 |
3.333 |
V |
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Line Regulation (Note 2) |
VOUT |
4.75V ≤ VIN ≤ 7V |
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1 |
6 |
mV |
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(VIN) |
4.75V ≤ VIN ≤ 10V |
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2 |
10 |
mV |
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Load Regulation (Note 2) |
VOUT (IOUT) |
VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX) |
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5 |
15 |
mV |
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Thermal Regulation |
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VOUT(Pwr) |
TA = 25°C, 20ms pulse |
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0.01 |
0.02 |
% / W |
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Ripple Rejection (Note 3) |
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COUT = 100µF (Tantalum), IOUT = 7.5A |
60 |
83 |
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dB |
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Quiescent Current |
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IQ |
0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V |
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4 |
10 |
mA |
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Dropout Voltage |
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LX8383-33 |
V |
VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V |
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1.5 |
V |
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LX8383A/83B-33 |
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VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V |
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1.3 |
V |
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Maximum Output Current |
IOUT (MAX) |
VIN ≤ 7V |
7.5 |
9.5 |
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A |
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Temperature Stability (Note 3) |
VOUT (T) |
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0.25 |
1 |
% |
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Long Term Stability |
(Note 3) |
VOUT (t) |
TA = 125°C, 1000 hours |
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0.3 |
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% |
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RMS Output Noise (% of VOUT) (Note 3) |
VOUT (RMS) |
TA = 25°C, 10Hz ≤ f ≤ 10kHz |
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0.003 |
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% |
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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.
Copyright © 1996 |
3 |
Rev. 1.0 12/96 |
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