LIN D O C # : 8383
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 AT O R S
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NFINITE
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N N O VAT I O N
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RODUCTION
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HEET
DESCRIPTION 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 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
s THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLTAGE s GUARANTEED < 1.3V HEADROOM AT 7.5A (LX8383A/8383B) s GUARANTEED < 1.5V HEADROOM AT 7.5A (LX8383) s OUTPUT CURRENT OF 7.5A MINIMUM p 0.015% LINE REGULATION p 0.15% LOAD REGULATION s EVALUATION BOARD AVAILABLE: REQUEST LXE9001 EVALUATION KIT
A P P L I C AT I O N S
s PENTIUM® PROCESSOR APPLICATIONS s HIGH EFFICIENCY LINEAR REGULATORS s POST REGULATORS FOR SWITCHING POWER SUPPLIES s BATTERY CHARGERS s CONSTANT CURRENT REGULATORS s CYRIX® 6x86TM s AMD-K5 TM
PRODUCT HIGHLIGHT
3.3V, 7.5A R E G U L AT O R
IN OUT 121Ω 1%
A VA I L A B L E O P T I O N S
Part #
PER
PAR T #
Output Voltage
Adjustable 3.3V
VIN ≥ 4.75V
1500µF 6.3V 6MV1500GX from Sanyo
LX8383A
ADJ
3.38V at 7.5A
2x 330µF, 6.3V Oscon SA type from Sanyo -or3x 1500µF, 6.3V 6MV1500GX from Sanyo
LX8383/83A/83B-00 LX8383/83A/83B-33
Other voltage options may be available — Please contact factory for details.
205Ω 1%
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.
PA C K A G E O R D E R I N F O R M AT I O N TA (°C) Dropout Voltage 1.5V 0 to 125 1.3V 1.3V 1.5V 1.3V
P Plastic TO-220 3-pin
LX8383-xxCP LX8383A-xxCP LX8383B-xxCP LX8383-xxIP LX8383A-xxIP
V Plastic TO-247 3-terminal
LX8383-xxCV LX8383A-xxCV LX8383B-xxCV LX8383-xxIV LX8383A-xxIV
-25 to 125
"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
Copyright © 1996 Rev. 1.0 12/96
11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841
1
PRODUCT DATABOOK 1996/1997
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 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 V OUT
3 2 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.
VIN VOUT ADJ / GND*
P PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions.
TAB ON REVERSE SIDE IS VOUT
T H E R MAL DATA
P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA V PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 1.6°C/W 35°C/W 2.7°C/W 60°C/W
3 2 1
VIN VOUT ADJ / GND*
V PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions.
Junction Temperature Calculation: TJ = TA + (PD x θJA). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
BLOCK D IA GR A M
VIN
Bias Circuit Thermal Limit Circuit Bandgap Circuit Control Circuit Output Circuit
VOUT
SOA Protection Circuit
ADJ or GND*
* This pin GND for fixed voltage versions.
Current Limit Circuit
2
Copyright © 1996 Rev. 1.0 12/96
PRODUCT DATABOOK 1996/1997
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 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 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
Reference Voltage (Note 4) LX8383/83A-00
Symbol
VREF
Test Conditions
LX8383/83A/83B-00 Min. Typ. Max.
1.238 1.225 1.240 1.238 1.250 1.250 1.250 1.250 0.015 0.035 0.15 0.3 0.01 83 55 0.2 1.2 1 2 9.5 0.25 0.3 0.003 1.262 1.270 1.260 1.262 0.2 0.3 0.4 0.5 0.02
Units
V V V V % % % % %/W dB µA µA V V mA A % % %
IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX LX8383B-00 IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX Line Regulation (Note 2) ∆V REF 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V (VIN ) 1.5V ≤ (VIN - VOUT ), VIN ≤ 10V Load Regulation (Note 2) ∆V REF VOUT ≥ V REF, VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 7.5A, T A = 25°C (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 7.5A Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V CADJ = 10µF, I OUT = 7.5A Adjust Pin Current I ADJ Adjust Pin Current Change (Note 4) ∆ IADJ 10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V Dropout Voltage LX8383-00 ∆V ∆VREF = 1%, IOUT = 7.5A LX8383A/83B-00 ∆VREF = 1%, IOUT = 7.5A Minimum Load Current IOUT (MIN) VIN ≤ 10V Maximum Output Current IOUT (MAX) (VIN - VOUT) ≤ 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
65
100 5 1.5 1.3 10
7.5
1
LX8383-33/83A-33/83B-33 (3.3V Fixed)
Parameter
Output Voltage (Note 4) LX8383/83A-33
Symbol
VOUT
Test Conditions
LX8383/83A/83B-33 Min. Typ. Max.
3.267 3.235 3.274 3.267 3.3 3.3 3.3 3.3 1 2 5 0.01 83 4 3.333 3.365 3.326 3.333 6 10 15 0.02 10 1.5 1.3 1
Units
V V 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 ≤ 7.5A, P ≤ PMAX LX8383B-33 VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7.5A, 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 ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 7.5A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8383-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V LX8383A/83B-33 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V 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
7.5
9.5 0.25 0.3 0.003
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 Rev. 1.0 12/96
3
PRODUCT DATABOOK 1996/1997
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 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 LX8383/83A/83B 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 LX8383/83A/ 83B 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
LX8383/83A /83B
ADJ
OUT
Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON
