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| AIC2511 3A STEP-DOWN PWM CONVERTER FEATURES Operating Input Voltage From 4.5V to 24V 3.3V, 5V, 12V and Adjustable Output Version Adjustable Version Output Voltage Range, 1.25V to 24V 4% max Over Line and Load Regulation Available in TO-263-5, TO-220-5, TO-220B and TO-252-5 Package Requires Only 4 External Components. 150KHz Fixed Constant Frequency Low Power Standby Mode, IQ Typically 80A TTL Shutdown Capability. Current Limit Protection. and Thermal Shutdown GENERAL DESCRIPTION The AIC2511 series are step-down monolithic PWM converters for delivering 3A at fixed voltages of 3.3V, 5.0V, 12V and using an external divider to adjust output voltage from 1.25V to 24V with excellent line and load regulation. Switching frequency up to 150KHz is achievable thus allowing smaller-sized filter components. Internal current limit and thermal shutdown overloads. circuits The provide protection from internal precise reference combined with voltage feedback loop provides optimum output voltage accuracy and fast load transient response. 3A Guaranteed Output Load Current APPLICATIONS Fixed Voltage power supply for LCD Monitor and LCD TV On-Card Switching regulators Simple High Efficiency Step-down regulator TYPICAL APPLICATION CIRCUIT VIN + C1 5 ON/OFF GND 3 FB 4 AIC2511 1 IN OUT 2 L1 D1 C2 + R1 VOUT CF C1: electrolyte capacitor 470uF C2: electrolyte capacitor 220uF CF:refer to table1 D1: SK54 L1:33uH R2 R1 short, R2 and CF open for fixed version Analog Integrations Corporation 3A1, No.1 Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-2511P-02 071607 1 AIC2511 ORDERING INFORMATION AIC2511- XXXXXXX PACKING TYPE TR: TAPE & REEL TB: TUBE PACKAGE TYPE M5: TO-263-5 T5 : TO-220-5 B5 : TO-220B E5 : TO-252-5 P: Lead Free Commercial OUTPUT VOLTAGE DEFAULT : Adj 33 : 3.3V 50 : 5.0V 12 : 12.0V ORDER NUMBER AIC2511PM5 AIC2511-33PM5 AIC2511-50PM5 AIC2511-12PM5 PIN CONFIGURATION TO-263-5 FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. ON/OFF TO-220-5 FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. ON/OFF 12 3 4 5 AIC2511PT5 AIC2511-33PT5 AIC2511-50PT5 AIC2511-12PT5 12345 AIC2511PB5 AIC2511-33PB5 AIC2511-50PB5 AIC2511-12PB5 TO-220B FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. ON/OFF 12345 AIC2511PE5 AIC2511-33PE5 AIC2511-50PE5 AIC2511-12PE5 TO-252-5 1: IN 2. OUT 3. GND 4. FB 5. ON/OFF 12345 Example: AIC2511-50PM5TR 5.0V Output Version, in Lead Free TO-263-5 Package & Taping & Reel Packing Type AIC2511-33PB5TR 3.3V Output Version, in Lead Free TO-220B Package & Taping & Reel Packing Type 2 AIC2511 ABSOLUTE MAXIMUM RATINGS Supply Voltage FB, ON/OFF Pin Input Voltage Operating Temperature Range Storage Temperature Range Junction Temperature Lead Temperature (Soldering 10sec.) Thermal Resistance Junction to Case TO-263-5, TO-220-5, TO-220B TO-252-5 Thermal Resistance Junction to Ambient (Assume no ambient airflow, no heatsink) TO-263-5 TO-220-5, TO-220B TO-252-5 24V -0.3V to 24V -40C ~ 85C -65C ~ 150C 125C 260C 3C /W 12.5C /W 60C /W 50C /W 100C /W Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 3 AIC2511 ELECTRICAL CHARACTERISTICS (TA=25C, VIN=12V for the 3.3V, 5V and Adjustable version and VIN=24V for the 12V version.) (Note1) PARAMETER Input Voltage Fixed Output Voltage AIC2511-ADJ (VIN > 4.5V) AIC2511-33 (VIN > 4.75V) AIC2511-50 (VIN > 7.0V) AIC2511-12 (VIN > 15V) Saturation Voltage Output Voltage Regulation Quiescent Current Shutdown Quiescent Current FB bias current Output leakage current Logic Input High Logic Input Low Oscillator Frequency Output Current Limit Maximum Duty Cycle Minimum Duty Cycle Efficiency Vo=5V, Io=3A Internal switch off ON/OFF= 5V (OFF) VFB=1.3 Vout=-0.9 (Regulator OFF) (Regulator ON) 130 3.6 100 0 80 150 2.0 0.6 180 5.5 5 80 10 2 TEST CONDITIONS MIN. 4.5 1.193 3.168 4.800 11.52 1.2 TYP. MAX. 24 1.267 3.432 5.200 12.48 1.4 4 10 200 50 30 UNIT V V V V V V % mA A nA mA V V KHz A % % % Note 1: Specifications are production tested at TA=25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 4 AIC2511 TYPICAL PERFORMANCE CHARACTERISTICS 85 80 75 70 65 90 VOUT=3.3V version 85 80 75 70 VOUT=5.0V version Efficiency (%) 55 50 45 40 35 30 25 20 10 100 1000 Efficiency (%) 60 65 60 55 50 45 40 35 30 25 10 100 1000 Vin=5V Vin=12V Vin=18V Vin=24V Vin=12V Vin=18V Vin=24V Load current (mA) Load current (mA) Fig.1 3.3V version efficiency 95 90 85 80 90 85 Fig.2 5V version efficiency VOUT=12.0V version Case Tempearature ( C) o 80 75 70 65 60 55 50 45 40 35 30 4 8 12 16 Vout=12V Vout=5.0V Efficiency (%) 75 70 65 60 55 50 45 10 100 1000 Vin=18V Vin=24V Vout=3.3V IOUT=3A TO-263-5 20 24 Load current (mA) Input Voltage (V) Fig.3 12V version efficiency 200 190 Fig.4 Case temperature vs. input voltage 6.8 6.4 6.0 Switching Frequency (kHz) 180 Current Limit (A) -40 -20 0 20 o 170 160 150 140 130 120 110 100 -60 40 60 80 100 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 -60 -40 -20 0 20 40 60 80 100 TJ( C) Fig.5 Switching Frequency vs. Temperature Current Limit vs. Temperature Fig.6 Current Limit vs. Temperature 5 AIC2511 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 1.6 1.5 1.4 1.6 1.5 1.4 Dropout Voltage (vlot) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -60 -40 -20 0 20 40 60 80 100 120 140 Saturation Voltage (volt) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 -40 C 25 C 100 C o o o 3A 1A TJ ( C) o Switch Current (A) Fig.7 Dropout Voltage vs. Temperature 2.5 Fig.8 Switching Saturation Voltage vs. Switch Current 5.0 4.8 ON/OFF threshold voltage (volt) Minimum Supply Voltage (volt) 2.0 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 VFB=1.23V ILOAD=120mA OFF 1.5 1.0 ON 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 120 140 2.8 -60 -40 -20 0 20 40 60 80 100 120 140 TJ ( C) o TJ ( C) o Fig.9 ON/OFF Threshold Voltage vs. Temperature Fig.10 Minimum Operating Supply Voltage vs. Temperature (ADJ only) 2.0 1.5 VIN=24V o o -40 C Current (A) 1.0 0.5 VOUT 100mV/div VIN=12V VOUT=5V 0 5 10 15 20 25 0.0 ON/OFF Pin Voltage (Volt) Fig.11 ON / OFF Pin Current (sinking) vs. Temperature Fig.12 Load transient response 6 AIC2511 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Fig.13 FB Pin Ripple(CCM) Fig.14 FB Pin Ripple(DCM) BLOCK DIAGRAM SHDN IN 1.23 V Reference FB Current Limit COMP. AMP. COMP. 2.6V Regulator ON / OFF Compensation Circuit Latch Driver OUT 150KHz OSC Thermal Shutdown GND 7 AIC2511 PIN DESCRIPTIONS PIN 1: IN Supply voltage input for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Internal switch. The voltage at this pin switches between (VIN-VSAT) and approximately -0.5V, with a duty cycle of approximately VOUT/VIN. Ground requires a short, low noise connection to ensure good load regulation. PIN 4: FB Feedback input for fixed-output or adjustable-output version. Connect directly to output for fixed operation version or to a resistor divider for adjustable operation versions. PIN 2: OUT PIN 3: GND PIN 5: ON / OFF Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 80A. Drive it high to disable the reference, control circuitry and internal switches. Drive low or connect to GND for normal operation. APPLICATION INFORMATION Thermal considerations The AIC2511 is available with TO-220-5, TO220B, TO-263-5 and TO-252-5 packages. The TO-220-5 and TO-220B packages need a heat sink in most conditions. The TO-263-5 and TO252-5 packages are designed to be soldered to the copper on a printed circuit board. The printed circuit board is the heat sink for TO-263-5 and TO-252-5 packages and other heat components, such as inductors and diodes. The size of the heat sink depends on the power loss of AIC2511 and the ambient temperature. The power loss of AIC2511 is determined by input voltage, output voltage and load current. The Fig.4 represents the curve of the AIC2511 case temperature in different conditions. The curve shows the AIC2511 temperature rises above ambient temperature for a 3A load with different input and output voltage. The values of the temperature rise, which are affected by factors such as sink size, heat produced from heat components, and etc., may be different from those in Fig.8 depending on the conditions of the application. According to the equation 1, as the power loss or ambient temperature is rising the heat sink size must be increased to decrease the thermal resistance ( R jA ) so that the junction temperature does not over 125 C. An appropriate increase of heat sink size may result in a normalranged junction temperature. PD = T j - TA R jA As junction temperature rises to its temperature protect point, the AIC2511 will stop working. Output voltage drops to zero until the junction temperature decreases to a normal range. 8 AIC2511 APPLICATION INFORMATION (Continued) Components Selection Inductor The inductor selection depends on the operating frequency of the AIC2511. The ripple current IL interrelates with inductor value. A lower inductor value gets a higher ripple current. Besides, a higher VIN or VOUT can also get the same result. The inductor value can be calculated as the following formula. V 1 L= VOUT 1 - OUT (f )(IL ) VIN Users can define the acceptable IL to gain a suitable inductor value. Diode The diode current rating must be higher than 1.3 times maximum load current. Also, if the power supply needs to resist a continuous output short, the diode should have a current ration equal to the maximum current limit of the AIC2511. The reverse voltage rating of the diode should be higher than 1.25 times input voltage and the diode must be fast. The reverse recovery time of the diode is short. Capacitor The selection of output capacitor depends on the suitable ripple voltage. Lower ripple voltage corresponds to lower ESR (Equivalent Series Resistor) of output capacitor. Typically, once the ESR is satisfied with the ripple voltage, the value of capacitor is adequate for filtering. The formula of ripple voltage is as below: 1 VOUT = IL ESR + 8fC OUT The typical input capacitor is 470uF. But as the temperature decreases, the input capacitor needs to increase to stabilize the circuit. Example Assume the input voltage is 12V, output voltage is 5V and maximum load current is 3A. The output ripple must be smaller than 2% of output voltage Inductor selection L= V 1 VOUT 1 - OUT ( f )(I L ) V IN = 1 5 x 5 x 1 - = 32.4uH 150k x 0.6 12 Here, the delta IL is 0.6A. So we choose 33uH inductor. Output capacitor selection 1 VOUT = I L ESR + 8 fC OUT < 100mV We choice the capacitor value: ESR=0.12, capacitance=220uF 1 = 74mV < 100mV VOUT = I L ESR + 8 fCOUT The full load is 3A and delta IL is 0.6A, so the diode current rating must be higher than 3.6A. CF Capacitor for adj version As using the AIC2511 adj version, the CF capacitor is required to provide additional stability. In different condition, the CF capacitor must be changed to make the circuit stable. Output Input Voltage (V) Voltage (V) 1.8 4 6 8 10 15 7 12 12 15 18 25 R1 () 36k 180k 180k 180k 150k 110k R2 () 82k 82k 47k 33k 22k 10k CF (pF) 1000 360 360 360 470 560 Table 1 9 AIC2511 PHYSICAL DIMENSIONS (unit: mm) TO-263-5 A E L1 c2 S Y M B O L TO-263-5L MILLIMETERS MIN. 4.06 0.00 0.51 0.38 1.14 8.38 9.65 1.70 BSC 14.61 1.78 -0.25 BSC 0 8 15.88 2.79 1.68 MAX. 4.83 0.25 0.99 0.74 1.65 9.65 10.67 A A1 D b H c c2 D E e A A e SEE VIEW B H L L1 L3 q b WITH PLATING BASE METAL SECTION A-A GAUGE PLANE Note: 1. Refer to JEDEC TO-263BA. 2. Dimension "E" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. Dimension "D" does not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. L3 A1 L VIEW B SEATING PLANE c 10 AIC2511 PHYSICAL DIMENSIONS(Continued) (unit: mm) TO-220B E E1 E1 A F TO-220B MILLIMETERS MIN. 4.318 4.250 8.250 0.690 0.304 3.556(REF) 8.480 2.743(REF) 9.906 4.953 3.708 1.524 6.604 1.143 9.880 9.090 10.44 5.220 3.962 2.032 7.112 1.397 10.64 9.850 9.300 MAX. 4.826 4.550 8.550 0.940 0.530 S Y M B O L d A A1 A2 b C D D1 d E E1 D D1 e e1 F L L1 L L1 e e1 b C A1 A2 Note : Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 11 AIC1595 PHYSICAL DIMENSIONS(Continued) (unit: mm) TO-220-5L E E1 E1 A F S Y M B O L TO-220-5L MILLIMETERS MIN. 4.064 2.032 0.635 0.304 3.429 7.620 2.620 9.779 4.953 3.708 1.524 1.143 13.589 MAX. 4.826 2.921 1.016 0.460 3.683 9.398 2.870 10.668 5.220 3.962 2.032 1.397 14.351 d A A1 b C D D1 d E E1 D D1 e F L L e b C A1 Note : Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 12 AIC1595 PHYSICAL DIMENSIONS(Continued) (unit: mm) TO-252-5 E b3 L3 A c2 S Y M B O L TO-252-5L MILLIMETERS MIN. 2.19 0.00 0.51 4.32 0.46 0.46 5.33 6.35 1.27 BSC 9.40 1.40 2.67 REF 0.51 BSC 0.89 0 2.03 8 10.41 1.78 MAX. 2.38 0.13 0.71 5.46 0.61 0.89 6.22 6.73 A A1 b D H b3 c c2 D e A A SEE VIEW B E e H L L1 L2 L3 b WITH PLATING BASE METAL SECTION A-A c GAUGE PLANE L L2 VIEW B SEATING PLANE Note: 1. Refer to JEDEC TO-252AD and AB. 2. Dimension "E" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. Dimension "D" does not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A1 L1 13 |
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