AS2715 1.5A High Current Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response (ADVANCED INFORMATION) FEATURES APPLICATIONS • Adjustable Output Down To 1.2V • 1% output accuracy @ 2.5V, 3.3V& 5.0V • Output Current of 1.5A • Low Dropout Voltage of 350mV @ 1.5A • Extremely Tight Load And Line Regulation • Extremely Fast Transient Response • Reverse-battery and “Load Dump” Protection • Standard 3-Terminal Low Cost TO-220, TO-263 • Powering VGA & Sound Card • LCD Monitors • USB Power Supply • Power PC Supplies • SMPS Post-Regulator • High Efficiency “Green” Computer Systems • High Efficiency Linear Power Supplies • Portable Instrumentation • Constant Current Regulators • Adjustable Power Supplies • Battery Charger PRODUCT DESCRIPTION The AS2715 is a 1.5A high accuracy, low dropout voltage regulator with only 350mV(Typ.)@ 1.5A). The AS2715 is designed for low voltage application that requires 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 AS2715 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%. Features such as Enable pin, Error Flag pin are also included in the 5 pin packages. The AS2715 is offered in a 3 & 5-pin TO-220 & TO-263 package compatible with other 3 terminal regulators. For a 3A low dropout regulator refer to the AS2730 data sheet. ORDERING INFORMATION TO-220 TO-263 3-PIN 3-PIN AS2715U-X AS2715T-X X = Output Voltage (2.5V, 3.3V, 5.0V or Blank for Adjustable.) Consult with factory for other fixed output voltages. PIN CONNECTIONS TO-263-3 Package TO-220-3 Package AS2715 1 VIN 2 3 AS2715 GND VOUT Front View VIN GND VOUT Front View Rev. 10/11/00 AS2715 ABSOLUTE MAXIMUM RATINGS Lead Temperature (soldering, 5 seconds)……………………260°C Storage Temperature Range…………………………-65°C +150°C Operating Junction Temperature Range……………..-40°C +125°C Input Voltage)………………………………………..260°C Input Supply Voltage (Note 1) (Survival)……-20V to +60V ELECTRICAL CHARACTERISTICS at IOUT = 10mA, TA = 25°C, unless otherwise specified. The Boldface applies over the junction temperature range. PARAMETER CONDITIONS Typ AS2715 Min Max Units 2.5V Version IOUT = 10mA 10mA ≤IOUT≤1.5A, 4.3V≤VIN ≤16V 2.5 2.5 2.475 2.450 2.525 2.550 V IOUT = 10mA 10mA ≤IOUT≤1.5A, 4.3V≤VIN ≤16V 3.3 3.3 3.267 3.234 3.330 3.366 V IOUT = 10mA 10mA ≤IOUT≤1.5A, 5.5V≤VIN ≤16V 5.0 5.0 4.95 4.90 5.05 5.10 V IO = 10mA, (VOUT + 1V) ≤ VIN≤ 16V VIN = VOUT + 5V, 10mA ≤ IOUT≤ IFULLLOAD 0.1 0.2 0.5 1 % % Output Voltage Temperature Coef. 50 100 ppm/°C IO = 100mA 90 200 mV IO = 750mA 280 IO = 1.5A 490 690 Ground Current (Note 3) IO = 750mA, VIN = VOUT, +1V IO = 1.5A 12 25 25 IGNDDO Ground Pin Current at Dropout Current Limit VIN = 0.1V less than specified VOUT IOUT = 10mA 0.9 Output Voltage 3.3V Version2. Output Voltage 5.0V Version Output Voltage All Voltage Options Line Regulation Load Regulation ∆V ∆T Dropout Voltage (Note 1) Output Noise Voltage (10Hz to 100kHz) IL = 100mA Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient VOUT = 0V (Note 2) 2.2 CL = 10µF 400 CL = 33µF mA 1.7 A µV RMS 260 1.240 40 (Note 4) mA 1.228 1.215 1.252 1.265 V 80 120 nA 50 ppm/°C 0.1 nA/°C Rev. 10/11/00 AS2715 Upper Threshold Voltage Lower Threshold Voltage Hysteresis Device set for 3.3V (Note 5) 60 Device set for 3.3V (Note 5) 75 Device set for 3.3V (Note 5) 15 40 25 mV 95 140 mV mV NOTES: Note 1: Dropout voltage is defined as the input-to output differential when the output voltage drops to 95% of its nominal value. Note 2: VIN = VOUT (NOMINAL) +1V. For example, use VIN= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. Note 3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current. Note 4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Note 5: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 6: VEN ≤ 0.8V and VIN≤ 16V, VOUT = 0. BLOCK DIAGRAM IN OUT O.V ILIMIT FLAG + - 1.180V Reference 1.240V 28V + R1* ADJ EN Thermal Shutdown R2* GND Rev. 10/11/00 AS2715 APPLICATION HINTS The AS2715 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. Thermal Consideration Although the AS2715 offers 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. 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. will guarantee stability over load. A tantalum capacitor is recommended for a fast load transient response. If the power source has high AC impedance, a 0.1µF capacitor between input & ground is recommended. This capacitor should have good characteristics up to 250 kHz. Minimum Load Current To ensure a proper behavior of the regulator at light load, a minimum load of 5mA for AS2715 is required. VIN VOUT AS2715 Assuming: VIN = 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 PD = (VIN – VOUT) * IOUT = 7.5W Fig.1 Basic Fixed Output Regulator Junction Temperature TJ = TA + PD * (θCase – HS + θ HS θ JC) For the Control Section TJ = 50 + 7.5*(0.5 + 6=3) = 121.25°C 121.25°C < TJ (max) for the Control & Power Sections. In both case reliable operation is insured by adequate junction temperature. Capacitor Requirements The output capacitor is needed for stability and to minimize the output noise. The required value of the capacitor varies with the load. However, a minimum value of 10µF Aluminum Rev. 10/11/00 AS2715 Load Regulation Line Regulation 3.310 3.320 3.305 3.315 3.300 3.305 Vout (V) Vout (V) 3.310 3.300 3.295 3.295 3.290 3.3V Device IL = 10mA CL = 10uF 3.290 3.285 3.3V Device Vin = 4.3V CL = 10uF 3.285 3.280 3.280 4 6 8 10 12 14 0 16 0.25 0.5 0.75 1 1.25 1.5 IL (A) Vin (V) Ground Current vs. Load Current Ground Current vs. Input Voltage 80.0 260 70.0 240 220 50.0 I Gnd (uA) I Gnd (mA) 60.0 40.0 30.0 180 3.3V Device Vin = 4.3V CL = 10uF 20.0 10.0 200 3.3V Device IL = 10mA CL = 10uF 160 0.0 140 0 0.25 0.5 0.75 1 1.25 1.5 4 6 8 IL (A) 10 12 14 16 Vin (V) Ground Current vs. Load Current (In Dropout) Dropout Voltage vs. Load Current 600 100 500 90 V Dropout (mV) 80 I Gnd (mA) 70 60 50 40 3.3V Device Vin = 3.2V CL = 10uF 30 20 400 300 200 3.3V Device Vin = 3.2V CL = 10uF 100 10 0 0 0 0.25 0.5 0.75 IL (A) 1 1.25 1.5 0 0.25 0.5 0.75 1 1.25 1.5 IL (A) Rev. 10/11/00 AS2715 Ground Current vs. Temperature (IL = 10mA) Output Voltage vs. Temperature 3.320 270 3.310 260 3.300 250 3.290 240 3.280 Vout (V) I Gnd (uA) 280 230 220 3.3V Device Vin = 4.3V IL = 10mA CL = 10uF 210 200 190 3.270 3.260 3.3V Device Vin = 4.3V IL = 10mA CL = 10uF 3.250 3.240 3.230 180 3.220 -40 -20 0 20 40 60 80 100 120 -40 -20 0 o 40 60 80 100 120 Temperature ( C) Ground Current vs. Temperature (In Dropout, IL = 750mA) Ground Current vs. Temperature (IL = 500mA) 35 7.00 34 6.80 3.3V Device Vin = 4.3V IL = 500mA CL = 10uF 6.40 6.20 3.3V Device Vin = 3.2V IL = 750mA CL = 10uF 33 32 I Gnd (mA) 6.60 I Gnd (mA) 20 o Temperature ( C) 6.00 5.80 5.60 31 30 29 28 5.40 27 5.20 26 5.00 -40 -20 0 20 40 60 80 100 25 120 -40 o Temperature ( C) Ground Current vs. Temperature (IL = 1.5A) -20 50.0 20 40 60 o Temperature ( C) 80 100 120 100 120 Ground Current vs. Temperature (In Dropout, IL = 1.5A) 100 52.0 0 95 90 46.0 I Gnd (mA) I Gnd (mA) 48.0 44.0 42.0 3.3V Device Vin = 4.3V IL = 1.5A CL = 10uF 40.0 38.0 36.0 -40 -20 0 20 40 60 o Temperature ( C) 80 100 120 85 3.3V Device Vin = 3.2V IL = 1.5A CL = 10uF 80 75 70 -40 -20 0 20 40 60 o Temperature ( C) 80 Rev. 10/11/00 AS2715 Dropout Voltage vs. Temperature (IL = 750mA) 400 380 V Dropout (mV) 360 340 320 300 280 3.3V Device Vin = 3.2V IL = 750mA CL = 10uF 260 240 220 200 -40 -20 0 20 40 60 80 100 120 o Temperature ( C) Rev. 10/11/00 AS2715 PACKAGE DRAWING TO-263-3L (T) 0.405 ± 0.005 (10.287 ± 0.127) 0.176± 0.005 (4.470 ± 0.127) 0.050 ± 0.002 (1.270 ± 0.051) 0.055 (1.397) 0.356 ± 0.005 (9.042 ± 0.127) 0.600 +- 0.025 (15.24 ± 0.635) 0.103 BSC (2.616) 0.050 (1.270) 0.032 +- 0.001 (0.813 +- 0.025) 0.015 (0.381 ++- 0° 8° 0.003 0.074) 0.100 (2.540 ± ± 0.010 0.254) Rev. 10/11/00 AS2715 PACKAGE DRAWING TO-220-3L (U) 0.151D ± 0.002 (3.835 D ± 0.051) 0.180 ± 0.005 (4.572 ± 0.127) 0.408 ± 0.013 (10.36 ± 0.33) 0.110 ± 0.010 (2.794 ± 0.254) 0.050 ± 0.002 (1.270 ± 0.051) 0.250 ± 0.010 (6.350 ± 0.254) Tapered 1o 2 Sides 0.340 ± 0.010 (8.636 ± 0.254) 0.150 MIN (3.81 MIN) 0.540 ± 0.015 (13.720 ± 0.381) 0.050 TYP (1.27 TYP) 0.200 ± 0.010 (5.080 ± 0.254) SEATING PLANE 1.020 ± 0.015 (25.910 ± 0.381) 7o Typ. 0.410 (10.41) 0.015 ± 0.010/-0.015 (2.667± 0.254/-0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.032 ± 0.005 (0.813 ± 0.127) 0.015 ± 0.010/-0.002 (0.381± 0.254/-0.051) Rev. 10/11/00