PD-94475D Ultra Low Dropout Linear Regulator OMR9601SC +3.3Vin to +2.5Vout at 3.0A Product Summary Part Number Dropout IO Vin Vout OMR9601SC 0.4V 3.0A 3.3V 2.5V MO-078AA Features: The OMR9601SC 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 capabilitiy 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 MO-078AA (TO-258AA) pack ensures higher reliability K-level screened This part is also available in 8-Lead Flat Pack Package as OMR9601SF Absolute Maximum Ratings Parameter Symbol Value Units IO 3.5 A Input Voltage Power Dissipation TC = 25°C Vin PTOT 7 19 W Thermal Resistance, Junction to Case Operating Temperature Range RTHJC 6.5 °C/W TJ -55 to +125 TS TL -65 to +150 Output Current Storage Temperature Range Lead Temperature www.irf.com V °C 300 1 09/02/04 OMR9601SC Electrical Characteristics @Ta = 25°C (Unless Otherwise Specified) Pre-Radiation Parameter Test Conditions Symbol Min. Typ. Max. 2.475 2.5 2.525 Vout 2.375 2.375 - 2.625 2.625 Vin Vdrop Ilatch 2.375 2.375 2.9 -3.0 - 2.625 2.625 6.5 0.4 65 - 200 - 1.0 -0.1 - 1.6 +0.1 Vin = 3.3V, IO = 1.5A Vin = 3.135V, IO = 50mA Output Voltage Vin = 3.135V, IO = 3.0A Vin = 3.465V, IO = 50mA Input Voltage Range - Operating Dropout Voltage Current Limit Vin = 3.465V, IO = 3.0A IO = 3.0A IO = 3.0A, Vout = 2.5V Vin = 3.3V, Overcurrent Latch Up Ripple Rejection Shutdown Source Current F = 120Hz, Iout = 50mA Vshdn = 5.0V Ishdn Shutdown Pin Threshold Vin = 3.3V Vshdn Output Voltage at Shutdown Vin = 3.3V, IO = 50mA, Vshdn = +5.0V c Vout (shdn) Units V A dB µA V Electrical Characteristics @Ta = -55°C to 125°C (Unless Otherwise Specified) Pre-Radiation Parameter Test Conditions Symbol Min. Typ. Max. 2.375 2.5 2.625 Vout 2.375 2.375 - 2.625 2.625 Vin Vdrop Ilatch 2.375 2.375 2.9 3.0 - 2.625 2.625 6.5 0.4 65 - 200 - 1.0 -0.1 - 1.6 +0.1 Vin = 3.3V, IO = 1.5A Vin = 3.135V, IO = 50mA Output Voltage Vin = 3.135V, IO = 3.0A Vin = 3.465V, IO = 50mA Input Voltage Range - Operating Dropout Voltage Current Limit Vin = 3.465V, IO = 3.0A IO = 3.0A IO = 3.0A, Vout = 2.5V Vin = 3.3V, Overcurrent Latch Up Ripple Rejection Shutdown Source Current F = 120Hz, Iout = 50mA Vshdn = 5.0V Ishdn Shutdown Pin Threshold Vin = 3.3V Vshdn c Output Voltage at Shutdown Vin = 3.3V, IO = 50mA, Vshdn = +5.0V Vout (shdn) Units V A dB µA V Refer page 3 for Notes for Electrical Characteristic Tables 2 www.irf.com OMR9601SC Electrical Characteristics @Ta = 25°C (Unless Otherwise Specified) Post-Radiation Parameter Test Conditions Symbol Min. 2.375 - 2.625 Vout 2.375 2.375 - 2.625 2.625 Imax 2.375 2.375 3.0 - Vout (shdn) 40 -0.1 - 2.625 2.625 +0.1 Vin = 3.3V, IO = 1.5A Vin = 3.135V, IO = 50mA Output Voltage Vin = 3.135V, IO = 3.0A Vin = 3.465V, IO = 50mA Current Limit Vin = 3.465V, IO = 3.0A Vin = 3.3V Ripple Rejection F = 120Hz, Iout = 50mA Output Voltage at Shutdown Vin = 3.3V, IO = 50mA, Vshdn = +5.0V Typ. Max. 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 120 1.5A 100 .75A .50A 80 (db) 3A 60 40 20 0 100 1,000 10,000 100,000 1,000,000 Frequency (Hz) Fig 1. Ripple Rejection Vs Frequency www.irf.com 3 OMR9601SC Post-Radiation Characteristics Total Ionizing Dose (TID) 2.70 2.68 Hybrid Regulator Unbiased @90 r/s 250C 2.66 2.64 2.62 Vout (V) 2.60 2.58 2.56 Hybrid Regulator Biased @ 90 r/s 250C 2.54 2.52 2.50 2.48 Test Data (Reg. Dr.) no load @ 50 r/s, 250C 2.46 1 10 100 1000 Total Dose Level (krads) Fig 2. Voltage Output Vs Total Ionizing Dose Fig 3. Voltage Output Vs Total Ionizing Dose 4 www.irf.com OMR9601SC 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 OMR9601SC Vin Vin Vout Vout OMR9601 100uF 16V Tantalum . 1.0uF x 10 Ceramic X7R SHDN 1000uF 6.3V Low ESR Tantalum GND 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, OMR9601 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 OMR9601 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 OMR9601SC V in V out D rive S hutdown G nd G round Fig 7. Simplified Schematic Circuit MIL-PRF-38534 Screening Requirements TEST/INSPECTION SCREENING LEVEL MIL-STD-883 CLASS K (Space Level) METHOD Pre Seal Burn-In Optional 1030 Nondestructive Bond Pull 100% 2023 Internal Visual 100% 2017 Temperature Cycle 100% 1010 Constant Acceleration 100% 2001 Mechanical Shock 100% 2002 2020 PIND 100% Pre Burn-In-Electrical 100% Burn-In 100% Final Electrical 100% 1015 Seal 100% 1014 Radiographic 100% 2012 External Visual 100% 2009 Note: International Rectifier does not currently have a DSCC certified Radiation Hardness Assurance Program www.irf.com 7 OMR9601SC Case Outline and Dimensions - MO-078AA Pin Assignment Pin # 1 Pin Description Vin 2 3 GND Vout 4 SHUTDOWN 5 N/C Notes: 1) All dimensions are in inches 2) The tolerance for X.XXX = 0.005 Part Numbering Nomenclature OM R 9601 S C P Process Identification Screening R = Radiation Tolerant P = 100 % Final Electrical K = Class K per MIL-PRF-38534 Device Number Isolated / Non-Isolated S = Isolated Package Code C = MO-078AA (TO-258AA) 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. 09/2004 8 www.irf.com