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| AP033 1.5A Low Dropout Positive Fixed-Mode Regulator Features * * * * * General Description AP033 is a low dropout positive fixed-mode regulator with minimum of 1.5A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply. AP033 is guaranteed to have <1.4V dropout at full load current making it ideal to provide well regulated outputs of 3.3V with 4.7V to 12V input supply by different output voltage. 3-Terminal and Fixed 3.3V 1.4V Maximum Dropout at Full Load Current. Fast Transient Response. Built-in Thermal Shutdown. Output Current Limiting. Applications * * PC peripheral Communication Ordering Information AP 033 X X X LDO Regulator 033 Vout = 3.3V Package Lead Free Packing Blank : Tube A : Taping D : TO252-3L Blank : Normal L : Lead Free Package Pin Assignments 3 PIN TO252 3 2 1 Tab is GND VOUT GND VIN Pin Descriptions Name Pin # Function The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be 1.4V higher than VOUT in order for the device to regulate properly. Ground The output of the regulator. A minimum of 10F capacitor must be connected from this pin to ground to insure stability. Ground VIN 1 GND VOUT 2 3 This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.0 Aug.27, 2004 1/5 AP033 1.5A Low Dropout Positive Fixed-Mode Regulator Block Diagram Vin 1 3 Vout + + CURRENT LIMIT + THERMAL SHUTDOWN 2 GND 1.25V + Absolute Maximum Ratings Symbol Vin PD TST TOP Parameter DC Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Rating Unit -0.3 to 14 V Internally Limited o -65 to +150 C o 0 to +150 C Electrical Characteristics (Under Operating Conditions) Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage (VIN-VOUT) Current Limit Quiescent Current Thermal Regulation Ripple Rejection Temperature Stability Thermal Resistance Junction-to-Ambient (No heat sink ;No air flow) Thermal Resistance Junction-to-Case Conditions VIN = 5V, IOUT = 0mA, TJ = 25oC 4.7V o Min. Typ. Max. Units 3.267 3.300 3.333 V 3.235 3.300 3.365 V 0.5 10 mV 1.0 10 mV 3 15 mV 8 33 mV 1.3 1.4 V A mA %/W dB % o 72 TO-252 TO-252: Control Circuitry/Power Transistor C/W C/W Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 2W. Power dissipation is determined by the input/output differential and the output current. Note 3: Dropout voltage is specified over the full output current range of the device. Note 4: AP033 is guaranteed to operate at higher peak current than 1.6 Amp. See the thermal regulation specifications for changes in output voltage due the heating effects. Anachip Corp. www.anachip.com.tw 2/5 Rev.1.0 Aug.27, 2004 AP033 1.5A Low Dropout Positive Fixed-Mode Regulator Typical Application 5V VOUT AP033 C2 100uF GND C1 100uF VIN 3.3V/ 1.5A Tab is GND 5V to 3.3V Fixed Mode Regulator Function Description Introduction The AP033 fixed-mode Low Dropout (LDO) regulator is a 3 terminal device. The AP033 only needs 1.4V differential between VIN and VOUT to maintain output regulation. In addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. For example, Intel VRE specification calls for a total of +/- 100mV including initial tolerance, load regulation and 0 to 1.5A load step. The AP033 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. Load Regulation Since the AP033 is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at the load. But it can supply good load regulation by internal feedback bypass the external loss such as adjustable mode. Stability The AP033 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. For most applications a minimum of 10uF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The AP033 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperature. Although this device can operate with junction temperatures in the range of 150oC, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the temperature. Layout Consideration The output capacitors must be located as close to the VOUT terminal of the device as possible. It is recommended to use a section of a layer of the PC board as a plane to connect the VOUT pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance. Anachip Corp. www.anachip.com.tw 3/5 Rev.1.0 Aug.27, 2004 AP033 1.5A Low Dropout Positive Fixed-Mode Regulator Typical Performance Characteristics 1.4 Dropout Voltage (VIN -VOUT) Output Voltage Deviation(%) TJ =25oC Load Regulation 0 -0.2 -0.4 -0.6 -0.8 -1 -1.2 -1.4 -1.6 -1.8 -2 -25 0 25 50 75 100 ILOAD =1.5A Dropout Voltage (V) 1.2 1 0.8 0.6 0.4 0.2 0 0 200 TJ =125oC 400 600 800 Output Current (mA) Temperature( oC) Temperature Stability 2 1 Output Voltage Deviation(%) 0.8 0.6 0.4 0.2 0 Line regulation Output Voltage Chang (%) 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -50 -25 0 25 50 75 100 125 150 5 7 Temperature ( oC) Input Voltage(V) 9 11 13 15 AP 033 Line Tra nsie nt Re sponse Input Voltage (V) 7.5 Out put Voltage D ev iat ion (m V) C IN = 1 F C OU T= 10 F Tantalum AP 033 Loa d Tra nsie nt Re sponse 30 20 10 0 -10 -20 -30 2 Load C urrent (A) C IN = 10 F C O U T = 10 F Tantalum V IN = 4.8V Preload= 0.1A 6.5 5.5 40 4.5 20 0 -20 -40 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 Out put Voltage D ev iat ion(m V) 0 1 0 -1 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 TIME(s ) TIME(s ) Anachip Corp. www.anachip.com.tw 4/5 Rev.1.0 Aug.27, 2004 AP033 1.5A Low Dropout Positive Fixed-Mode Regulator Marking Information (Top view) Logo Part Number AP033 XXXX XX Blank: normal L: Lead Free Package ID Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002 ~ TO252-3L Package Dimension TO252-3L 5.6 E b2 L2 5.6 11.0 2.25 2.0 7.2 1.2 H SEE NOTE2 C1 L SEATING PLANE L1 D b e1 e Land Pattern Recommendation (Unit: mm) A1 C Notes: 1. 2. JEDEC Outline: TO-252 AB Mils suggested for positive contact at mounting. Symbol A A1 b b2 C C1 D E e e1 H L L1 L2 Dimensions In Millimeters Min. Nom. Max. 2.18 2.29 2.39 1.02 1.15 1.27 0.61 TYP. 5.20 5.35 5.50 0.46 0.52 0.58 0.46 0.52 0.58 5.33 5.57 5.80 6.35 6.58 6.80 2.25 BSC. 4.50 BSC. 9.00 9.70 10.40 0.51 0.64 0.83 1.02 1.52 1.78 2.03 Dimensions In Inches Min. Nom. Max. 0.086 0.090 0.094 0.040 0.045 0.050 0.024 TYP. 0.205 0.211 0.217 0.018 0.020 0.023 0.018 0.020 0.023 0.210 0.219 0.228 0.250 0.259 0.268 0.089 BSC. 0.177 BSC. 0.354 0.382 0.409 0.020 0.025 0.033 0.040 0.060 0.070 0.080 Anachip Corp. www.anachip.com.tw 5/5 A Rev.1.0 Aug.27, 2004 |
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