LIN D O C # : 8386
LX8386-xx/8386A-xx/8386B-xx
1 . 5 A LOW DR O P O U T P OSITIVE 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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ATA
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HEET
DESCRIPTION The LX8386/86A/86B series ICs are positive regulators designed to provide 1.5A output current. These regulators yield higher efficiency than currently available devices with all internal circuitry designed to operate down to a 1V input-to-output differential. In this product, the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.3V (LX8386A/86B) and 1.5V (LX8386) at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to 1% (0.8% for the 8386B) initial accuracy and 2% (1% for the 8386B) over line, load and temperature. The LX8386/86A/86B series devices are pin-compatible with earlier 3terminal regulators, such as 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 LX8386/86A/86B series quiescent current flows into the load, increasing efficiency. This feature contrasts with PNP regulators, where up to 10% of the output current is wasted as quiescent current. The LX8386-xxI is specified over the full industrial temperature range of -25°C to +125°C and the LX8386/86A/86B-xxC 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 s Guaranteed 40ºC/W depending on mounting technique.
DT PACKAGE (D-Pak) (Top View)
* Pin 1 is GND for fixed voltage versions.
BLOCK DIAGRAM
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 © 1999 Rev. 1.7a 10/00
PRODUCT DATABOOK 1996/1997
LX8386-xx/8386A-xx/8386B-xx
1 . 5 A LOW DR O P O U T P OSITIVE 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 LX8386/86A/86B-xxC with 0°C ≤ TA ≤ 125°C, and the LX8386-xxI with -25°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 1.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
LX8386/86A/86B-00 (Adjustable)
Parameter
Reference Voltage (Note 4) LX8386/86A-00
Symbol
VREF
Test Conditions
LX8386/86A/86B-00 Min. Typ. Max.
1.238 1.225 1.240 1.238 1.250 1.250 1.250 1.250 0.015 0.15 0.01 83 55 0.2 1.2 1.1 2 2.0 0.25 0.3 0.003 1.262 1.270 1.260 1.262 0.2 0.4 0.04
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 LX8386B-00 IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX Line Regulation (Note 2) ∆VREF(VIN ) 1.5V ≤ (VIN - V OUT) ≤ 7V, IOUT = 10mA Load Regulation (Note 2) ∆VREF(IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 1.5A 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 = 1.5A Adjust Pin Current I ADJ Adjust Pin Current Change (Note 4) ∆IADJ 10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V Dropout Voltage LX8386-00 ∆V ∆VREF = 1%, IOUT = 1.5A LX8386A/86B-00 ∆VREF = 1%, IOUT = 1.5A 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
1.5
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LX8386/86A/86B-33 (3.3V Fixed)
Parameter
Output Voltage (Note 4) LX8386-33
Symbol
VOUT
Test Conditions
LX8386/86A/86B-33 Min. Typ. Max.
3.267 3.235 3.274 3.267 3.30 3.30 3.30 3.30 1 2 5 0.01 83 4 1.2 1.1 2.0 0.25 0.3 0.003 3.333 3.365 3.326 3.333 6 10 15 0.02 10 1.5 1.3
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 ≤ 1.5A, P ≤ PMAX LX8386A/86B-33 VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 1.5A, 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 = 1.5A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8386-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) LX8386A/86B-33 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) 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
1.5
1
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 © 1999 Rev. 1.7a 10/00
3
PRODUCT DATABOOK 1996/1997
LX8386-xx/8386A-xx/8386B-xx
1 . 5 A LOW D R O P O U T P OSITIVE 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 LX8386/86A/86B series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of voltage regulators: 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 LX8386/86A/ 86B 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 LX8386 /8386A/8386B ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON
