 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Data Sheet No. PD94696 IRU1502-33 MICROPOWER 1A LOW DROPOUT PMOS VOLTAGE REGULATOR FEATURES Stable with Ceramic Capacitor Small, Space Saving MLPM 6-Pin Package Guaranteed < 1V Dropout at Full Load Current Fast Transient Response Ultra-Low Ground Current Output Current Limiting Built-In Thermal Shutdown DESCRIPTION The IRU1502-33 is a PMOS low dropout, linear regulator and it is capable of supplying 1A of continuous current over line and temperature range. The IRU1502-33 is stable with low value ceramic capacitors, ensures low noise operation, improves load transient response and enables a smaller circuit size. IRU1502-33 features ultra low noise, fast start-up and an excellent time and load response. This device also includes built-in output protection with both current limit and thermal shutdown. APPLICATIONS High Efficiency Linear Regulator Hard Disk Drivers, CD-ROMs, DVDs ADSL and Cable Modems TYPICAL APPLICATION 1 NC Gnd VIN NC VOUT 6 5V C1 4.7uF X5R 3.3V C2 4.7uF X5R IRU1502-33 2 5 3 NC 4 Figure 1 - Typical application of IRU1502-33. PACKAGE ORDER INFORMATION TJ (C) 0 To 125 DEVICE IRU1502-33CH PACKAGE 6-Pin MLPM 3x3 (H) MARKING 1502 Rev. 1.0 07/17/03 www.irf.com 1 IRU1502-33 ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) .................................................... 6V Operating Ambient Temperature Range ..................... -40C To 125C Storage Temperature Range ...................................... -65C To 150C CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. PACKAGE INFORMATION 6-PIN MLPM 3x3 (H) TOP VIEW NC Gnd NC 1 6 *uJA=428C/W uJC=2.38C/W VIN *Exposed Pad on underside is connected NC to a typical 1" square copper pad (typically VOUT ground) through vias for a 4-layer PCB board design. 2 Pad 5 3 4 ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over VIN=4.5V to 5.5V, IOUT=2mA to 1A, CIN=10mF, COUT=10mF, 08C SYM MIN 3.234 3.2175 TYP 3.3 3.3 MAX 3.366 3.3825 15 100 3.3825 3.3825 2 UNITS V mV mV V A mA % %Vo dB 8C mA % Line Regulation Load Regulation Dropout Voltage Current Limit Minimum Output Current Temperature Stability RMS Output Noise Ripple Rejection Thermal Shutdown Quiescent Current Transient Response Step Load Change (light load to full load) Droop Voltage Transient Response Step Load Change (full load to light load) Output Voltage Transient Response Change of VOUT with Application of VIN Transient Response Short Circuit Removal Response 3 3 1 1.4 0.5 0.003 55 650 5 45 135 VIN=5V, 1A to 10mA, tf/1ms, Note 5 3.6 V 0 to 5V step input, tr/1ms, 10mA[IO[1A Note 5 DVOUT VIN=5V, IO=ISHORT to IO=10mA DIOUT Note 5 DVOUT DVIN @IO=Short 3.6 V 3.6 V 2 www.irf.com Rev. 1.0 07/17/03 IRU1502-33 Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data. Note 2: In general, Dropout voltage is defined as the minimum differential voltage between VIN and VOUT required to maintain regulation at VOUT. In this specification, it is the measured output voltage at specified condition. Note 3: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Note 4: Temperature stability is the change in output from nominal over the operating temperature range. Note 5: Guaranteed by design, but not tested in production. Note 6: All limits are guaranteed. All electrical characteristics have temperature limits that are tested during TA=258C at probing and tested at final production with TA=1008C. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations. PIN DESCRIPTIONS PIN # 1,3,5 2 4 6 PIN SYMBOL NC Gnd VOUT VIN PIN DESCRIPTION No connection. Ground pin. The output of the regulator. A minimum of 4.7mF output capacitance must be connected from this pin to ground to insure stability. The power input pin of the regulator. A minimum of input capacitance must be 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 higher than the VOUT pin by the amount of dropout voltage (see electrical specification) in order for the device to regulate properly. BLOCK DIAGRAM VIN 6 Over Current Protection Thermal Shutdown 4 VOUT Control Logic VIN VREF Gnd 2 Figure 2 - Simplified block diagram of the IRU1502-33. Rev. 1.0 07/17/03 www.irf.com 3 IRU1502-33 TYPICAL PERFORMANCE CHARACTERISTICS Unless specified, the test data applies: TA=258C, CIN=4.7mF, COUT=4.7mF ceramic and VIN=5V. DV Figure 3 - Step load response from 2mA to 1A, tr/1ms. Ch1: Output voltage, AC, 50mV/div Ch4: Load Current, 0.5A/div Figure 5 - Output short circuit operation. DV = 3.26V Ch1: Output voltage, 1V/div Ch4: Load Current, 1A/div 3.26V Figure 4 - Step-up transient load response from 2mA to 1A, tr<1ms. Ch1: Output voltage, AC, 50mV/div Ch4: Load Current, 0.5A/div Figure 6 - Short circuit removal, IOUT from short to 10mA. Ch1 Peak: 3.26V Ch1: Output voltage, 1V/div Ch4: Load Current, 1A/div 4 www.irf.com Rev. 1.0 07/17/03 IRU1502-33 TYPICAL PERFORMANCE CHARACTERISTICS Unless specified, the test data applies: TA=258C, CIN=4.7mF, COUT=4.7mF ceramic and VIN=5V. Figure 7 - Start-up at IOUT=10mA. Ch1: 5V input voltage, 2V/div Ch2: 3.3V output voltage, 2V/div Figure 9 - Input voltage transient response, VIN from 0V to 5V, COUT=10mF. Ch2 Peak: 3.48V Ch1: 5V input voltage, 2V/div Ch2: 3.3V output voltage, 1V/div Figure 8 - Start-up at IOUT=1A. Ch1: 5V input voltage, 2V/div Ch2: 3.3V output voltage, 2V/div Figure 10 - Thermal shutdown removal response. ILOAD = 10mA Ch1 Peak: 3.44V Ch1: Output voltage, 1V/div Ch4: Load Current, 1A/div Rev. 1.0 07/17/03 www.irf.com 5 IRU1502-33 TYPICAL PERFORMANCE CHARACTERISTICS Unless specified, the test data applies: TA=258C, CIN=4.7mF, COUT=4.7mF ceramic and VIN=5V. 3.320 3.315 Output Voltage (V) Output Voltage (V) 3.310 VIN=4.75V 3.305 3.300 3.295 3.290 -50 VIN=5.25V 3.302 3.300 3.298 3.296 3.294 3.292 3.290 3.288 3.286 3.284 -25 0 25 50 75 100 125 150 3.282 -50 -25 0 25 50 75 100 Temperature (C) 125 150 VIN=4.75V VIN=5.25V Temperature (C) Figure 11 - Output Voltage vs. Temperature (IO=5mA). Figure 12 - Output Voltage vs. Temperature (IO=1A). 450 Dropout Voltage (mV) 400 350 IO=1A 300 250 200 150 100 50 0 -50 -25 0 25 50 75 100 125 150 IO=0.8A Temperature (C) Figure 13 - Dropout Voltage vs. Temperature and Load Current. 6 www.irf.com Rev. 1.0 07/17/03 IRU1502-33 TYPICAL PERFORMANCE CHARACTERISTICS Unless specified, the test data applies: TA=258C, CIN=4.7mF, COUT=4.7mF ceramic and VIN=5V. 400 Quiescent Current (uA) 350 Current Limit (A) IO=2mA -25 0 25 50 75 100 125 150 300 250 200 150 100 50 0 -50 IO=1A 1.50 1.49 1.48 1.47 1.46 1.45 1.44 1.43 1.42 1.41 1.40 1.39 -50 -25 0 25 50 75 100 Temperature (C) 125 150 Temperature (C) Figure 14 - Quiescent Current vs. Load Current and Temperature. Figure 15 - Typical Current Limit vs. Temperature (VIN=5.5V) -40 Ripple Rejection (dB) -45 -50 -55 -60 -50 -25 0 25 50 75 100 125 150 Temperature(C) Figure 16 - 120Hz Ripple Rejection vs. Temperature. Rev. 1.0 07/17/03 www.irf.com 7 IRU1502-33 APPLICATION INFORMATION Introduction The IRU1502-33 regulator is a 3-terminal device offered in a fixed output of 3.3V and it is designed specifically to provide an extremely low dropout voltage. The IRU1502-33 is 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 number of output capacitors. Thermal Protection When the junction temperature exceeds 1358C, the internal thermal protection shuts the IRU1502-33 down. Current Limit Protection The IRU1502-33 provides Over Current Protection when the output current exceeds typically 1.4A. The output decreases to limit the power dissipation. Stability The IRU1502-33 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. A minimum input capacitance of 4.7mF and a minimum output capacitance 4.7mF Ceramic capacitor is needed for regulator stage as well as the specified minimum loads to guarantee stability. Transient Response and PSRR The input and output capacitors are critical in order to ensure good transient response and PSRR. The most important aspects of this are capacitor selection, placement and trace routing. Place each capacitor as close as physically possible to its corresponding regulator pin. Use wide traces for a low inductance path. Couple directly to the ground and power planes as possible. The use of low ESR capacitors is crucial to achieving good results. Larger capacitance and lower ESR will improve both PSRR and transient response. Thermal Design The IRU1502-33 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 1508C, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below 1258C. The following shows the typical thermal design. Power consumption JC Junction CH HA Ambient JA(through plastic cover) Figure 17 - Thermal resistor diagram for IRU1502-33. Where: JC is the thermal resistance from junction to case. CH is the thermal resistance from case to heat sink if applicable. HA is the thermal resistance from heat sink to ambient. JA(through plastic cover) is the thermal resistance from junction to the ambient through plastic cover. Typically it is very large and can be neglected. Therefore, overall junction-to-ambient thermal resistance can be represented as: JA JC+CH+HA Where JA is the junction to ambient thermal resistance. 8 www.irf.com Rev. 1.0 07/17/03 IRU1502-33 The thermal pad of MLPM is connected to a 1 inch square copper through vias for a four layer PCB board design. From the datasheet, this thermal junction-to-ambient resistance is given as: JA=428C/W Where: JC 2.38C CH 18C HA 38.78C For IRU1502-33, the thermal design needs to be consider so that the resultant junction temperature is lower than the maximum operating temperature, which is 1258C. Therefore: TJ = JA3PD+TA [ 1258C Assuming, the following conditions: VOUT = 3.3V VIN = 5V IOUT = 1A (DC Avg) Calculate the maximum power dissipation using the following equation: PD = IOUT3(VIN - VOUT) PD = 13(5 - 3.3) = 1.7W For MLPM package, we have: uJA = 428C/W TA = 458C DT = PD3uJA = 1.7342 = 71.4 TJ = TA+DT = 116.48C Layout Consideration The IRU1502-33, like many other high-speed regulators, requires that the output capacitors be close to the device for stability. For power consideration, a ground plane pad of approximately one-inch square on the component side must be dedicated to the device where all ground pins are connected to dissipate the power. If a multilayer board is used, it is recommended that the inner layers of the board are also dedicated to the size of the pad for better thermal characteristics. IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 Rev. 1.0 07/17/03 www.irf.com 9 IRU1502-33 (H) MLPM Package 6-Pin D/2 D e b L E/2 L3 E PIN 1 MARK AREA (SEE NOTE 1) R L4 EXPOSED PAD (OPTIONAL) E2 L2 L1 D2 NOTE 2 PIN NO. 1 TOP VIEW S L2 BOTTOM VIEW PIN NO. 1 A2 A Note 1: Details of pin #1 are optional, but must be located within the zone indicated. The identifier may be molded, marked or metalized features. Note 2: If L1 Max is not called out, the metalized feature will extend to the exposed pad. Thus L4 does not apply. A3 SIDE VIEW A1 SYMBOL DESIG A A1 A2 A3 b D D2 E E2 e L L1 L2 L3 L4 R S 6-PIN 3x3 MIN 0.80 0.00 0.65 0.15 0.33 1.92 1.11 0.20 0.16 --0.17 0.17 08 NOM MAX 0.90 1.00 0.025 0.05 0.70 0.75 0.20 0.25 0.35 0.43 3.00 BSC 2.02 2.12 3.00 BSC 1.21 1.31 0.95 0.29 0.45 0.24 0.40 --0.125 --0.30 ----0.127 REF 108 128 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. 10 www.irf.com Rev. 1.0 07/17/03 IRU1502-33 PACKAGE SHIPMENT METHOD PKG DESIG H PACKAGE DESCRIPTION MLPM 3x3 PIN COUNT 6 PARTS PER TUBE --PARTS PER REEL 3000 T&R Orientation Fig A 1 1 1 Feed Direction Figure A - Live Bug IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 Rev. 1.0 07/17/03 www.irf.com 11 |
Price & Availability of IRU1502-33
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |