SPX1086T-3.3

SPX1086 SIPEX | Alldatasheet

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Rev. 11/2/00 SPX1086 1.5A 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 1.5A • 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 & TO-252 • Constant Current Regulators
• Similar To Industry Standard LT1086/LT1586 • Adjustable Power Supplies
• Battery charger PRODUCT DESCRIPTION The SPX1086 is a low power 1.5A adjustable and fixed voltage regulators that are very easy to use. It requires only 2 external resistors to set the output voltage for adjustable version. The SPX1086 is designed for low voltage applications that offer lo wer dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocess or that require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switchin g supplies applications. The SPX1086 features low dropout of a maximum 1.2 volts. The SPX1086 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 SPX1086 are offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For a 3A low dropout regulator refer to the SPX1587 data sheet. Front View TO-220-3 (U) SPX1086 1 23 ADJ/GND VOUT VIN Top View TO-263-3 (T) SPX1086 2 3 ADJ/GND VOUT VIN Front View TO-252 (R) ADJ/GND V INVOUT 321 SPX1086 PIN CONNECTIONS

Rev. 11/2/00 SPX1086 ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, Ta=25°C, unless otherwise specified. PARAMETER CONDITIONS Typ SPX1086A Min Max SPX1086 Min Max Units 1.5V Version Output Voltage (Note 2) SPX1086-1.5V, 0 ≤IOUT≤1.5A, 2.75V≤VIN ≤29V 1.5 1.5 1.485 1.470 1.515 1.530 1.470 1.455 1.530 1.545 V 2.5V Version Output Voltage (Note 2) SPX1086-2.5V,0 ≤IOUT≤1.5A, 4.0V≤VIN ≤29V 2.5 2.5 2.475 2.450 2.525 2.550 2.450 2.425 2.550 2.575 V 3.3V Version Output Voltage (Note 2) SPX1086-3.3V, 0 ≤IOUT≤1.5A, 4.75V≤VIN ≤29V 3.3 3.3 3.270 3.240 3.330 3.360 3.230 3.201 3.370 3.399 V 5.0V Version Output Voltage (Note 2) SPX1086-5.0V, 0 ≤IOUT≤1.5A, 6.5V≤VIN ≤29V 5.0 5.0 4.95 4.90 5.05 5.10 4.900 4.850 5.100 5.150 V All Voltage Options Reference Voltage (VREF) VIN≤ 7V, P≤ PMAX 1.5V≤ (VIN -VOUT)≤5.75V, 10mA≤IOUT≤1.5A 1.250 1.225 1.270 1.225 1.270 V Min. Load Current (Note 3) 1.5V≤ (VIN -VOUT)≤5.75V 5 10 10 mA Line Regulation (∆VREF(VIN)) 2.75V≤VIN ≤29V, IOUT=10mA, TJ=25°C (Note 3) 0.005 0.2 0.2 VIN ≤29V, IOUT=0mA, TJ=25°C (Note 2) 0.005 0.2 0.2 Load Regulation(∆VREF(IOUT)) 10mA≤IOUT ≤1.5A, (VIN-VOUT)=3V, TJ=25°C (Note 3) 0.05 0.3 0.3 0≤IOUT ≤1.5A, VIN=7V, TJ=25°C (Note 2) 0.05 0.3 0.3 Dropout Voltage ∆VREF=1% IOUT =1.5A (Note 3) IOUT≤ 1.5A (Note 2) 1.1 1.2 1.2 V Current Limit IOUT(MAX) VIN=7V 1.4V≤ (VIN- VOUT) (Note3) 2.5 1.7 1.7 A Long Term Stability TA=125°C, 1000 Hrs. 0.3 (Note 2) 1 1 % Thermal Regulation (∆VOUT(Pwr)) TA=25°C, 20 ms pulse 0.01 0.020 0.020 %/W Temperature Stability (∆VOUT(T)) 0.25 % Output Noise, RMS 10Hz to 10khz TA=25°C 0.003 % V O TO-220 Junction to Tab Junction to Ambient Thermal Resistance Junction to Ambient 3.0 3.0 3.0 3.0 3.0 3.0 °C/W °C/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

Rev. 11/2/00 SPX1086 APPLICATION HINTS The SPX1086 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, R 1 = value of resistor R 1 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 / VREF 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 SPX1086 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 = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W, θHeatsink Case= 6°C/W, θHeatsink Case = 0.5°C/W, θ JC = 3°C/W Power dissipation under this condition P D = (VIN – VOUT) * IOUT = 7.5W Junction Temperature T J = TA + PD * (θ Case – HS + θ HS + θ JC) For the Control Sections T 121.25°C < TJ(max) for the Control & Power Sections. In both case reliable operation is insured by adequate junction temperature.

Rev. 11/2/00 SPX1086 Basic Adjustable Regulator Output Voltage Consider Figure 2. The resistance R 1 generates a constant current flow, normally the specified load current of 10mA. This current will go through the resistance R 2 to set the overall output voltage. The current IADJ 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 R 1 resistance from the resistor divider to the case, and not to the load. For the same reason, it is best to connect the resistor R 2 to the Negative side of the load. SPX1086 Fig.2 Basic Adjustable Regulator VOUTV IN VREF R1 VOUT = VREF * ( 1 + R2/R1) + IADJ * R2 I ADJ 50µA SPX1086 Fig.3 Basic Adjustable Regulator VIN Connect R 2 to Load RL Connect R 1 to Case of Regulator RP Parasitic Line Resistance

Rev. 11/2/00 SPX1086 TYPICAL APPLICATIONS IN OUT ADJ SPX1086 VOUT Fig. 5 Typical Adjustable Regulator VIN LOAD ADJ SPX1086 Fig. 4 1.5A Current output Regulator VIN OUTIN VOUT = VREF (1 + R2 ) + IADJ R2 Note A: VIN(MIN) = (Intended VOUT) + (VDROPOUT (MAX) ) SPX1086 Fig. 6 Improving Ripple Rejection VIN 150µF 10µF* 121Ω 365Ω 10µF *C1 improves ripple rejection. Xc should be ~ R1 at ripple frequency. ADJ IN OUT (Note A) VOUT SPX1086 Fig.7 5V Regulator with Shutdown VIN 100µF 121Ω 365Ω 10µF ADJ IN OUT (Note A) TTL Input 2N3904 Note A: VIN(MIN) = (Intended VOUT) + (VDROPOUT (MAX) )

Rev. 11/2/00 SPX1086 TYPICAL CHARACTERISTICS

Rev. 11/2/00 SPX1086

ORDERING INFORMATION

Ordering No. Precision Output Voltage Packages SPX1086U 2% Adj 3 Lead TO-220 SPX1086U-1.5 2% 1.5V 3 Lead TO-220 SPX1086U-2.5 2% 2.5V 3 Lead TO-220 SPX1086U-3.3 2% 3.0V 3 Lead TO-220 SPX1086U-5.0 2% 5.0V 3 Lead TO-220 SPX1086AU 1% Adj 3 Lead TO-220 SPX1086AU-1.5 1% 1.5V 3 Lead TO-220 SPX1086AU-2.5 1% 2.5V 3 Lead TO-220 SPX1086AU-3.3 1% 3.0V 3 Lead TO-220 SPX1086AU-5.0 1% 5.0V 3 Lead TO-220 SPX1086T 2% Adj 3 Lead TO-263 SPX1086T-1.5 2% 1.5V 3 Lead TO-263 SPX1086T-2.5 2% 2.5V 3 Lead TO-263 SPX1086T-3.3 2% 3.0V 3 Lead TO-263 SPX1086T-5.0 2% 5.0V 3 Lead TO-263 SPX1086AT 1% Adj 3 Lead TO-263 SPX1086AT-1.5 1% 1.5V 3 Lead TO-263 SPX1086AT-2.5 1% 2.5V 3 Lead TO-263 SPX1086AT-3.3 1% 3.0V 3 Lead TO-263 SPX1086AT-5.0 1% 5.0V 3 Lead TO-263 SPX1086R 2% Adj 3 Lead TO-252 SPX1086R-1.5 2% 1.5V 3 Lead TO-252 SPX1086R-2.5 2% 2.5V 3 Lead TO-252 SPX1086R-3.3 2% 3.0V 3 Lead TO-252 SPX1086R-5.0 2% 5.0V 3 Lead TO-252 SPX1086AR 1% Adj 3 Lead TO-252 SPX1086AR-1.5 1% 1.5V 3 Lead TO-252 SPX1086AR-2.5 1% 2.5V 3 Lead TO-252 SPX1086AR-3.3 1% 3.0V 3 Lead TO-252 SPX1086AR-5.0 1% 5.0V 3 Lead TO-252 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@sipex.com

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 liab ility arising out of the application or use of any pr oduct or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. Corporation