SPX1084U-5.0中文资料
SPX1084
5A Low Dropout Voltage Regulator
Adjustable & Fixed Output,
Fast Response
FEATURES
APPLICATIONS
? Adjustable Output Down To 1.2V
? Powering VGA & Sound Card ? Fixed Output Voltages 1.5, 2.5, 3.3 & 5.0V ? Power PC Supplies ? Output Current Of 5A
? SMPS Post-Regulator
? Low Dropout Voltage 1.1V Typ.
? High Efficiency “Green” Computer Systems ? Extremely Tight Load And Line Regulation ? High Efficiency Linear Power Supplies ? Current & Thermal Limiting
? Portable Instrumentation ? Standard 3-Terminal Low Cost TO-220 & TO-263 ? Constant Current Regulators ? Similar To Industry Standard LT1085/LT1585 ? Adjustable Power Supplies ? Battery charger
PRODUCT DESCRIPTION
The SPX1084 are low power 5A adjustable and fixed voltage regulators with 30V maximum V IN . They are very easy to use. It requires only 2 external resistors to set the output voltage for adjustable version. The SPX1084 are designed for low voltage applications that offers lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications. The SPX1084 features low dropout of a maximum of 1.2 volts.
The SPX1084 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The I Q of this device flows into load, which increases efficiency.
The SPX1084 are offered in 3-pin TO-220 and TO-263 packages compatible with other 3 terminal regulators. For a similar 5A low dropout voltage regulator refer to the SPX1084 datasheet. Also for higher current requirements, refer to the SPX1084 datasheet.
Front View TO-220-3 (U)
ADJ/GND V OUT IN
Top View
ADJ/GND V OUT V IN
PIN CONNECTIONS
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds)..............................300°C
Input Voltage........................................................30V Storage Temperature Range ............................-65° to +150°C Input to Output Voltage Differential....................30V Operating Junction Temperature Range
SPX1084 Control Section.......................... -45°C +125°C SPX1084 Power Transistor.........................-45°C +150°C
ELECTRICAL CHARACTERISTICS (NOTE 1) at I OUT = 10mA, T a =25°C, unless otherwise specified.
PARAMETER CONDITIONS Typ SPX1084A SPX1084 UNITS
Min Max Min Max
1.5V Version
1.485 1.515 1.47 1.53
V
Output Voltage (Note 2) SPX1084-1.5V, 0 < I OUT < 5A, 3.3V 1.5 1.47 1.53 1.455 1.545 2.5V Version 2.475 2.525 2.45 2.55 V Output Voltage (Note 2) SPX1084-2.5V, 0 < I OUT < 5A, 4.0V 2.5 2.45 2.55 2.425 2.575 3.3V Version 3.267 3.333 3.234 3.366 V Output Voltage (Note 2) SPX1084-3.3V, 0 < I OUT < 5A, 4.8V 3.3 3.234 3.366 3.069 3.399 5.0V Version 5 4.950 5.050 4.9 5.1 V Output Voltage (Note 2) SPX1084-5.0V, 0 ≤ I OUT ≤ 5A, 6.5V ≤V IN ≤25V 4.900 5.100 4.65 5.15 Adjustable Version Reference Voltage (V REF ) 1.250 1.238 1.262 1.225 1.270 V 1.5V ≤ (V IN -V OUT )≤25V, 10mA ≤I OUT ≤5A 1.250 1.225 1.270 1.212 1.288 All Voltage Options Min. Load Current (Note 3) 1.5V ≤ (V IN –V OUT )≤25V 5 10 10 V Line Regulation (?V REF (Vin)) 2.75V ≤V IN ≤25V, I OUT =10mA, T J =25oC (Note 3) 0.005 0.2 0.2 V IN ≤25V, I OUT =0mA, T J =25oC (Note 2) 0.005 0.2 0.2 % 10mA ≤I OUT ≤5A, (V IN -V OUT )=3V, T J =25oC (Note 3) 0.05 0.7 0.7 Load Regulation(?V REF (I OUT )) 0≤I OUT ≤5A, V IN =7V, T J =25oC (Note 2) 0.05 0.3 0.3 % Dropout Voltage ?V REF =1% I OUT = 5A (Note 3) I OUT < 5A (Note 2) 1.2 1.5 1.5 V IN =7V 6 5.2 5.2 A Current Limit I OUT (MAX) 1.4V ≤ (V IN – V OUT ) (Note3) Long Term Stability T A =125oC, 1000 Hrs. 0.3 (Note 2) 1 1 % Thermal Regulation(?V OUT (Pwr)) T A =25oC, 20 ms pulse 0.01 0.020 0.020 %/W Temperature Stability (?V OUT (T)) 0.25 % Output Noise, RMS 10Hz to 10kHz T A =25oC 0.003 % V O Thermal Resistance TO-220 Junction to Tab Junction to Ambient DD Package Junction to Tab Junction to Ambient 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 oC/W The Bold specifications apply to the full operating temperature range. Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 2: Fixed Version Only Note 3: Adjustable Version Only APPLICATION HINTS The SPX1084 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. However, the use of an output capacitor is required in order to insure the stability and the performances. Stability The output capacitor is part of the regulator’s frequency compensation system. Either a 220μF aluminum electrolytic capacitor or a 47μF solid tantalum capacitor between the output terminal and ground guarantees stable operation for all operating conditions. However, in order to minimize overshoot and undershoot, and therefore optimize the design, please refer to the section ‘Ripple Rejection’. Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum (220μF for an aluminum electrolytic capacitor, or 47μF for a solid tantalum capacitor). If the ADJ pin is not bypass, the value of the output capacitor can be lowered to 100μF for an electrolytic aluminum capacitor or 15μF for a solid tantalum capacitor. However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: C = 1 / ( 6.28 * F R * R1 ) Where C = value of the capacitor in Farads (select an equal or larger standard value), F R= ripple frequency in Hz, R1= value of resistor R1 in Ohms. If an ADJ-bypass capacitor is use, the amplitude of the output ripple will be independent of the output voltage. If an ADJ-bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: M = V OUT / V REF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. V REF = Reference Voltage Reducing parasitic resistance and inductance One solution to minimize parasitic resistance and inductance is to connect in parallel capacitors. This arrangement will improve the transient response of the power supply if your system requires rapidly changing current load condition. Thermal Consideration Although the SPX1084 offers some limiting circuitry for overload conditions, it is necessary not to exceed the maximum junction temperature, and therefore to be careful about thermal resistance. The heat flow will follow the lowest resistance path, which is the Junction-to-case thermal resistance. In order to insure the best thermal flow of the component, a proper mounting is required. Note that the case of the device is electrically connected to the output. In case the case has to be electrically isolated, a thermally conductive spacer can be used. However do not forget to consider its contribution to thermal resistance. Assuming: V IN = 7V, V OUT = 5V, I OUT = 1.5A, T A = 50°C/W, θHeatsink Case= 6°C/W, θHeatsink Case = 0.5°C/W, θJC = 3°C/W Power dissipation under this condition P D = (V IN – V OUT) * I OUT = 7.5W Junction Temperature T J = T A + P D * (θ Case- HS + θHS + θJC) For the Control Sections T J = 50 + 7.5*(0.5+6=3) = 121.25°C 121.25°C < T J(max) for the Control & Power Sections. In both case reliable operation is insured by adequate junction temperature. SPX1084 Basic Adjustable Regulator Output Voltage Consider Figure 2. The resistance R1 generates a constant current flow, normally the specified load current of 10mA. This current will go through the resistance R2 to set the overall output voltage. The current I ADJ is very small and constant. Therefore its contribution to the overall output voltage is very small and can generally be ignored Load Regulation Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect directly the R1 resistance from the resistor divider to the case, and not to the load. For the same reason, it is best to connect the resistor R2 to the Negative side of the load. SPX1084 TYPICAL APPLICATIONS OUT Fig. 5 Typical Adjustable Regulator Fig. 4 5A Current output Regulator V IN Note A: V Fig. 6 Improving Ripple Rejection V IN *C 1 V OUT Fig.7 5V Regulator with Shutdown V IN 100μF 5V TTL Input Note A: V IN(MIN) = (Intended V OUT ) + (V DROPOUT (MAX) ) SPX1084 ORDERING INFORMATION Ordering No. Precision Output Voltage Packages SPX1084U 2% Adj 3 Lead TO-220 SPX1084U-1.5 2% 1.5V 3 Lead TO-220 SPX1084U-2.5 2% 2.5V 3 Lead TO-220 SPX1084U-3.3 2% 3.3V 3 Lead TO-220 SPX1084U-5.0 2% 5.0V 3 Lead TO-220 SPX1084AU 1% Adj 3 Lead TO-220 SPX1084AU-1.5 1% 1.5V 3 Lead TO-220 SPX1084AU-2.5 1% 2.5V 3 Lead TO-220 SPX1084AU-3.3 1% 3.3V 3 Lead TO-220 SPX1084AU-5.0 1% 5.0V 3 Lead TO-220 SPX1084T 2% Adj 3 Lead TO-263 SPX1084T-1.5 2% 1.5V 3 Lead TO-263 SPX1084T-2.5 2% 2.5V 3 Lead TO-263 SPX1084T-3.3 2% 3.3V 3 Lead TO-263 SPX1084T-5.0 2% 5.0V 3 Lead TO-263 SPX1084AT 1% Adj 3 Lead TO-263 SPX1084AT-1.5 1% 1.5V 3 Lead TO-263 SPX1084AT-2.5 1% 2.5V 3 Lead TO-263 SPX1084AT-3.3 1% 3.3V 3 Lead TO-263 SPX1084AT-5.0 1% 5.0V 3 Lead TO-263 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Main Offices: 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@https://www.wendangku.net/doc/9e7340089.html, 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 935-7600 FAX: (408) 934-7500 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.