IRUH33P253A1M

PD-97042 Ultra Low Dropout Positive Fixed Linear Regulator IRUH33P253A1M +3.3Vin to +2.5Vout at 3.0A Product Summary Part Number IRUH33P253A1M Dropout 0.4V IO 3.0A Vin 3.3V Vout 2.5V 8-LEAD FLAT PACK Features: The IRUH33P253A1M is a space qualified, ultra low dropout linear regulator designed specifically for space applications. This product has been characterized to a total ionizing dose of 1.0 Mrad (Si) per MIL-STD-883, Method 1019, Condition D at both high and low dose rates under biased and unbiased conditions to account for ELDRS effects in bipolar devices. The ultra low dropout voltage of 0.4V @ 3A makes the part particularly useful for applications requiring low noise and higher efficiency. n Total dose to 1.0 Mrad (Si) and low dose n n n n n n n capability to 500 krad (Si) allows use in space applications Single Event latchup Immune LET= 84 MeV/(mg/cm2) Fluency = 1x109 ions/cm2 Low noise, higher efficiency Ultra low dropout voltage of 0.4V@ 3A out significantly reduces power consumption Remote shutdown permits power sequencing to be easily implemented Hermetic 8-lead flat pack ensures higher reliability Space Level Screened This part is also available in MO-078 Package as IRUH33P253B1M Absolute Maximum Ratings Parameter Output Current Input Voltage Power Dissipation TC = 25°C Thermal Resistance, Junction to Case Operating Temperature Range Storage Temperature Range Lead Temperature Symbol IO Vin PTOT RTHJC TJ TS TL Value 3.5 7 19 6.5 -55 to +125 -65 to +150 300 Units A V W °C/W °C www.irf.com 1 11/14/05 IRUH33P253A1M Electrical Characteristics @Ta = 25°C (Unless Otherwise Specified) Pre-Radiation Parameter Test Conditions Vin = 3.3V, IO = 1.5A Vin = 2.97V, IO = 50mA Output Voltage Vin = 2.97V, IO = 3.0A Vin = 3.63V, IO = 50mA Vin = 3.63V, IO = 3.0A Input Voltage Range - Operating IO = 3.0A IO = 3.0A, Vout = 2.5V Dropout Voltage Current Limit Ripple Rejection Shutdown Source Current Shutdown Pin Threshold Vin = 3.3V, Overcurrent Latch Up F = 120Hz, Iout = 50mA Vshdn = 5.0V Vin = 3.3V Vin = 3.3V, IO = 50mA, Vshdn = +5.0V Vin Vdrop Ilatch Ishdn Vshdn Vout (shdn) Vout Symbol Min. 2.475 2.375 2.375 2.375 2.375 2.9 -3.0 65 1.0 -0.1 Typ. 2.5 200 - Max. 2.525 2.625 2.625 2.625 2.625 6.5 0.4 1.6 +0.1 Units V A dB µA V c Output Voltage at Shutdown Electrical Characteristics @Ta = -55°C to 125°C (Unless Otherwise Specified) Pre-Radiation Parameter Test Conditions Vin = 3.3V, IO = 1.5A Vin = 2.97V, IO = 50mA Output Voltage Vin = 2.97V, IO = 3.0A Vin = 3.63V, IO = 50mA Vin = 3.63V, IO = 3.0A Input Voltage Range - Operating IO = 3.0A IO = 3.0A, Vout = 2.5V Dropout Voltage Current Limit Ripple Rejection Shutdown Source Current Shutdown Pin Threshold Vin = 3.3V, Overcurrent Latch Up F = 120Hz, Iout = 50mA Vshdn = 5.0V Vin = 3.3V Vin = 3.3V, IO = 50mA, Vshdn = +5.0V Vin Vdrop Ilatch Ishdn Vshdn Vout (shdn) Vout Symbol Min. 2.375 2.375 2.375 2.375 2.375 2.9 3.0 65 1.0 -0.1 Typ. 2.5 200 - Max. 2.625 2.625 2.625 2.625 2.625 6.5 0.4 1.6 +0.1 Units V A dB µA V c Output Voltage at Shutdown Refer page 3 for Notes for Electrical Characteristic Tables 2 www.irf.com IRUH33P253A1M Electrical Characteristics @Ta = 25°C (Unless Otherwise Specified) Post-Radiation Parameter Test Conditions Vin = 3.3V, IO = 1.5A Vin = 2.97V, IO = 50mA Output Voltage Vin = 2.97V, IO = 3.0A Vin = 3.63V, IO = 50mA Current Limit Ripple Rejection Output Voltage at Shutdown Vin = 3.63V, IO = 3.0A Vin = 3.3V F = 120Hz, Iout = 50mA Vin = 3.3V, IO = 50mA, Vshdn = +5.0V Vout (shdn) Imax Vout Symbol Min. 2.375 2.375 2.375 2.375 2.375 3.0 40 -0.1 Typ. - Max. 2.625 2.625 2.625 2.625 2.625 +0.1 Units V A dB V Notes for Electrical Characteristic Tables  VShutdown ramp from 0.8V to 4.8V, output monitored for a 100mV drop below the nominal specification for Vout Pre-Radiation Characteristics OMR9601 Ripple Rejection vs. Frequency 3A 120 100 80 (db) 60 40 20 0 100 1.5A .75A .50A 1,000 10,000 Frequency (Hz) 100,000 1,000,000 Fig 1. Ripple Rejection Vs Frequency www.irf.com 3 IRUH33P253A1M Post-Radiation Characteristics Total Ionizing Dose (TID) 2.70 2.68 2.66 2.64 2.62 2.60 Vout (V) 2.58 2.56 2.54 2.52 2.50 2.48 2.46 1 10 Total Dose Level (krads) 100 1000 Test Data (Reg. Dr.) no load @ 50 r/s, 250C Hybrid Regulator Biased @ 90 r/s 250C Hybrid Regulator Unbiased @90 r/s 250C Fig 2. Voltage Output Vs Total Ionizing Dose Fig 3. Voltage Output Vs Total Ionizing Dose 4 www.irf.com IRUH33P253A1M Post-Radiation Characteristics Enhanced Low Dose Rate Sensitivity (Dose Rate = 0.1 Rad/s) Fig 4. Voltage Output Vs Total Ionizing Dose Single Event Latch-up Fig 5. Voltage Output Vs Time www.irf.com 5 IRUH33P253A1M Vin Vin 100uF 16V Tantalum Vout Vout IRUH33P253A1M SHDN GND 1.0uFx10 Ceramic X 7R 1000uF 6.3V Low ESR Tantalum Ground Fig 6. Typical Application Circuit Input Capacitance Recommended input capacitance for a generic application is a 100µF, 16V tantalum capacitor. However, the input capacitance is not critical to the stability of the regulator and is therefore application dependent. In designs with a clean bus voltage that is situated close to the input of the regulator, only a small ceramic capacitor will be needed to decouple high frequency noise. On the other hand, in designs with a noisy bus, a larger capacitor will be needed. Care should be taken to ensure that the input to the regulator is sufficiently free of noise and disturbances. Output Capacitance Like most ultra low dropout voltage regulators, IRUH33P253A1M requires the use of an output capacitor as part of the device frequency compensation. The device requires a minimum of 220µF tantalum to ensure stability. Many different types of capacitor are available and have widely varying characteristics. These capacitors differ in capacitor tolerance, equivalent series resistance (ESR), equivalent series inductance and capacitance temperature coefficient. The IRUH33P253A1M frequency compensation optimizes frequency response with low ESR capacitors. In general, use capacitors with an ESR of less than 50 mΩ for heavy load applications. High quality bypass capacitors must also be used to limit the high frequency noise generated by the load. Multiple small ceramic capacitors are typically required to limit parasitic inductance (ESL) and ESR in the capacitors to acceptable levels. The upper limit of the capacitance is governed by the delayed over-current latch function of the regulator. The regulator has a protection circuit that will latch the device off in the event of a short circuit. However, since it is known that the regulator will draw a large in-rush current upon startup, the latch-off is delayed by about 10ms to allow the output capacitors to charge to a steady state without shutting down. During this period, the regulator will have an output current at its maximum of around 5A typical. Therefore, the maximum output capacitance can be as high as 20,000uF without causing device to latch-off during start-up. Figure 6 shows a typical application circuit. The output load capacitor consists of one tantalum capacitor (or more in parallel) of 1,000µF with ESR no high than 50 mΩ, and 10 x 1.0µF X7R ceramic caps. This will give approximately 59 degrees phase and 24dB gain margin. 6 www.irf.com IRUH33P253A1M V in D rive V out S hutdown G nd G roun d Fig 7. Simplified Schematic Circuit Space Level Screening Requirements TEST/INSPECTION SCREENING LEVEL SPACE Pre Seal Burn-In Nondestructive Bond Pull Internal Visual Temperature Cycle Constant Acceleration Mechanical Shock PIND Pre Burn-In-Electrical Burn-In Final Electrical Seal Radiographic External Visual Optional 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 1014 2012 2009 1015 MIL-STD-883 METHOD 1030 2023 2017 1010 2001 2002 2020 Note: International Rectifier does not currently have a DSCC certified Radiation Hardness Assurance Program www.irf.com 7 IRUH33P253A1M Case Outline and Dimensions - 8-Lead Flat Pack Pin Assignment Pin # 1 2 3 4 5 6 7 8 Pin Description GND GND SHUTDOWN N/C Vout Vout Vin Vin Notes: 1) All dimensions are in inches Part Numbering Nomenclature IR Linear Regulator Module U = Ultra Low Dropout Regulator U H 33 P 25 3 A 1M P Screening P = Unscreened, 25°C Electrical Test ( Not for Qual) K = Space Level Screening Radiation Hardening H = RAD Hardened or Tolerant RAD Level 1M = 1M Rads Input Voltage 33 = 3.3V Polarity P = Positive Package Code A = 8 Lead Flat Pack Output Voltage 25 = 2.5V Maximum Output Current 3 = 3 Amp IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 IR LEOMINSTER : 205 Crawford St., Leominster, Massachusetts 01453, USA Tel: (978) 534-5776 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 11/2005 8 www.irf.com