AS1115 600mA Low Dropout NPN Voltage Regulator FEATURES APPLICATIONS • Guaranteed 600mA Output • Three Terminal Adjustable Or Fixed 1.5V, 2.5V, 3V, 3.3V & 5V • Very Low Quiescent Current • Low Dropout Voltage Of 1.2 Volts At Full Load • Extremely Tight Load And Line Regulation • Very Low Temperature Coefficient • Logic-Controlled Electronic Shutdown • Internal Overcurrent Limiting & Thermal Overload Protection • Surface Mount Package SOT-223, TO-263, TO-252 , TO-220 & SO-8 • Portable/ Palm Top / Notebook Computers • Battery Chargers • Disk Drives • Portable Consumer Equipment • Portable Instrumentation • SMPS Post-Regulator PRODUCT DESCRIPTION The AS1115 is a low power positive-voltage regulator designed to meet 600mA output current. This device is an excellent choice for use in battery-powered applications, as active terminators for the SCSI bus, and portable computers. The AS1115 features very low quiescent current and very low dropout voltage of 1.2V at a full load and lower as output current decreases. This product is available as an adjustable or fixed 3V, 3.3V, and 5V output voltages. The AS1115 is offered in a 3-pin surface mount package SOT-223, TO-252, TO-220 & TO-263. The output capacitor of 10µF or larger is needed for output stability of AS1115 as required by most of the other regulator circuits. ORDERING INFORMATION TO-220 3-PIN AS1115U AS1115U-X TO-263 3-PIN AS1115T AS1115T-X SOT-223 3-PIN AS1115M3 AS1115M3-X PLASTIC SOIC 8-PIN AS1115S AS1115S-X TO-252 DPAK AS1115R AS1115R-X Oper. Temp. Range -40°C to +85°C -40°C to +85°C X = Output Voltage (X = 1.5V, 2.5V, 3.0V, 3.3V, 5.0V or Blank for Adjustable). PIN CONNECTIONS 3 VIN 2 V OUT AS1115 1 2 3 V OUT V IN 1 ADJ/GND ADJ/GND Front View Front View 8-Pin Surface Mount TO-220 Package Front View V IN V OUT ADJ/GND GND 1 8 N/C 2 7 V IN V OUT 3 AS1115 6 V IN V OUT 4 N/C 5 Top View TO-252 Package V IN AS1115 SOT-223 Package AS1115 AS1115 TO-263-3 Package 3 2 V IN V OUT 1 ADJ/GND Front View Rev. 10/2/00 AS1115 ABSOLUTE MAXIMUM RATINGS Power Dissipation..........................................Internally Limited Lead Temp. (Soldering, 5 Seconds) ................................ 260°C Storage Temperature Range ............................ -65° to +150°C Operating Junction Temperature Range AS1115 .................................................. -40C° to +125°C Input Supply Voltage ......................................-20V to +20V ESD Rating ............................................................2KV Min ELECTRICAL CHARACTERISTICS at VIN = VOUT +1, Ta=25°C, CL =3.3µf, unless otherwise specified. Limits in Boldface apply over the full operating temperature range. Parameter Conditions Typ AS1115 Min Max Units 1.5V Version Output Voltage IOUT=10mA, VIN=5.00V 0≤IOUT≤600mA, 4.50≤VIN≤10V 1.500 1.485 1.470 1.515 1.530 V IOUT=10mA, VIN=5.00V 0≤IOUT≤600mA, 4.50≤VIN≤10V 2.500 2.475 2.450 2.525 2.550 V IOUT=10mA, VIN=5.00V 0≤IOUT≤600mA, 4.50≤VIN≤10V 3.000 2.970 2.940 3.030 3.060 V IOUT=10mA, VIN=5.00V 0≤IOUT≤600mA, 4.50≤VIN≤10V 3.300 3.267 3.234 3.333 3.366 V IOUT=10mA, VIN=5.00V 0≤IOUT≤600mA, 4.50≤VIN≤10 5.000 4.950 4.900 5.050 5.100 V IOUT=10mA, (VIN- VIN) =2V 10≤IOUT≤600mA, 1.4≤(VIN -VIN) ≤10V 1.250 1.238 1.225 1.262 1.270 0.05 V 2.5V Version Output Voltage 3.0V Version Output Voltage 3.3 V Version Output Voltage 5.0V Version Output Voltage All Output Voltage Reference Voltage Output Voltage Temperature Stability Line Regulation % 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.05 7.00 7.00 10.00 12.00 12.00 15.00 1.10 1.15 mV Dropout Voltage ( Note 2) (Note 1) 4.50V ≤VIN≤12V, VOUT=3.00, IOUT=0 4.80V ≤VIN≤12V, VOUT=3.30, IOUT=0 6.50V ≤VIN≤15V, VOUT=5.00, IOUT=0 0≤IOUT≤600mA, VIN=4.50V, VOUT=3.00 0≤IOUT≤600mA, VIN=4.80V, VOUT=3.30 0≤IOUT≤600mA, VIN=6.50V, VOUT=5.00 IL = 100mA IL = 600mA Quiescent Current 4.25V ≤VIN≤6.5V 5.00 10.00 mA Current Limit Thermal Regulation Ripple Rejection (VIN-VOUT)=5V 25°°C,30mS Pulse fRIPPLE=120Hz, (VIN-VOUT) = 3V, VRIPPLE=1Vp-p 125°C, 1000Hrs % of VOUT, 10Hz≤f≤10kHz Junction to case, at tab Load Regulation Long Term Stability RMS Output Noise Thermal Resistance mV V 850 1000 mA 0.01 0.1 60 75 %/W dB 0.03 0.003 % % 15 °C/W° Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 3: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied. excluding loads or line regulation effect Rev. 10/2/00 AS1115 APPLICATION NOTES EXTERNAL CAPACITOR To ensure the stability of the AS1115 an output capacitor of at least 10µF (tantalum)or 50µF (aluminum) is required. The value may change based on the application requirements on the output load or temperature range. The capacitor equivalent series resistance (ESR) will effect the AS1115 stability. The value of ESR can vary from the type of capacitor used in the applications. The recommended value for ESR is 0.5Ω. The output capacitance could increase in size to above the minimum value. The larger value of output capacitance as high as 100µF can improve the load transient response. SOLDERING METHODS The AS1115 SOT-223 package is designed to be compatible with infrared reflow or vapor-phase reflow soldering techniques. During soldering the non-active or mildly active fluxes may be used. The AS1115 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. Hand soldering and wave soldering should be avoided since these methods can cause damage to the device with excessive thermal gradients on the package. The SOT-223 recommended soldering method are as follows: vapor phase reflow and infrared reflow with the component preheated to within 65°C of the soldering temperature range. THERMAL CHARACTERISTICS The thermal resistance of AS1115 is 15°C/W from junction to tab and 31 °C/W from tab to ambient for a total of 46 °C/W from junction to ambient. The AS1115 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continuos load conditions the maximum junction temperature does not exceed 125 °C. Taking the FR-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment (fig.1 & fig.2), the PCB material is effective at transmitting heat with the tab attached to the pad area and a ground plane layer on the backside of the substrate. Refer to table 1 for the results of the experiment. The thermal interaction from other components in the application can effect the thermal resistance of the AS1115. The actual thermal resistance can be determined with experimentation. AS1115 power dissipation is calculated as follows: PD = (VIN - VOUT)(IOUT) Maximum Junction Temperature range: TJ = Tambient (max) + PD* thermal resistance(Junction-toambient) Maximum Junction temperature must not exceed the 125°C. 10V 2.85V AS1115-3.3 + + 10uF 10uF 27K Ω PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 703mW Fig. 1. Circuit Layout, Thermal Experiments. 50 X 50 mm 35 X 17 mm 16 X 10 mm Fig. 2. Substrate Layout for SOT-223 Rev. 10/2/00 .. AS1115 Table 1. TOTAL PC BOARD AREA TOPDIDE COPPER AREA BACKSIDE COPPER AREA THERMAL RESISTANCE JUNCTION TO AMBIENT 2500mm 2500mm 2500mm 2500mm 2500mm 1600mm 2500mm 2500mm 1600mm 900mm 900mm 2500mm 1250mm 950mm 2500mm 1800mm 600mm 1250mm 915mm 600mm 240mm 240mm 2500mm 2500mm 2500mm 0 0 1600mm 0 0 0 900mm 0 46°C/W°° 47°C/W°° 49°C/W°° 51°C/W°° 53°C/W°° 55°C/W°° 58°C/W°° 59°C/W°° 67°C/W°° 72°C/W°° 85°C/W°° VIN IN AS1115 VIN OUT C1 IN C1 ADJ AS1115 C2 ADJ R1 LOAD VOUT OUT VOUT = VREF (1 + R2) + IADJ R2 R1 R1 R2 Typical Adjustable Regulator 600mA Current Output l Rev. 10/2/00