Standard Products VRG8691/92 Adjustable 7.5A Positive LDO Regulator Radiation Tolerant www.aeroflex.com/voltreg June 14, 2010 FEATURES Radiation performance - Total dose: 100 krads(Si), Dose rate = 50 - 300 rads(Si)/s Output voltage adjustable: 1.0V to 3.3V Output current: 7.5A Dropout voltage: 0.5V at 7.5Amps Voltage reference: 1.0V 0.5% Load regulation: 0.5% max Line regulation: 0.2% max Ripple rejection: >66dB Enable Input - TTL / CMOS Compatible Slow Start capability Packaging - Hermetic metal - Thru-hole or Surface mount - 12 Leads, 1.0"W x 0.9"L x .220"Ht - Power package - Weight - 18 gm max Designed for aerospace and high reliability space applications DSCC SMD 5962-09237 Pending NOTE: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program DESCRIPTION The Aeroflex Plainview VRG8691/92 is capable of supplying in excess of 7.5Amps over the output voltage range as defined under recommended operating conditions. The regulator is exceptionally easy to set-up, requiring only 2 external resistors to set the output voltage. The module design has been optimized for excellent regulation and low drop-out voltage. Figures 2 through 5 illustrate setting output voltage, setting current limits and choosing a slow start capacitor. The VRG8691/92 serves a wide variety of applications including local on-card regulation, programmable output voltage regulation or precision current regulation. The VRG8691/92 has been specifically designed to meet exposure to radiation environments. The VRG8691 is configured for a Thru-Hole 12 lead metal power package and the VRG8692 is configured for a Surface Mount 12 lead metal power package. It is guaranteed operational from -55C to +125C. Available screened to MIL-STD-883, the VRG8691/92 is ideal for demanding military and space applications. CURRENT LIMIT (ICL) The VRG8691/92 features internal current limiting making them virtually blowout-proof against overloads. The limit is nominally 11.5A @ Vin = 5V (see Table 2), but may be increased or decreased with the addition of one external resistor (see Application Note 2). When the load current exceeds the ICL setting, the output of the VRG8691/92 will be latched in an OFF state. To reset the latch condition, the ENABLE function (pin 5) can be cycled, enabled disabled - enabled, or the VBIAS may be cycled ON - OFF - ON (if the Figure 5 configuration is being utilized). VIN 1 12 2 11 VOUT 3 10 VBIAS 4 ENABLE GND VRG8691/92 9 VSENSE 5 8 Current Limit 6 7 Slow Start FIGURE 1 - BLOCK DIAGRAM / SCHEMATIC SCD8691 Rev E ABSOLUTE MAXIMUM RATINGS PARAMETER RANGE UNITS -55 to +150 C 300 C -65 to +150 C VBIAS, VIN 7 V Thermal Resistance (Junction to case JC) 1 C/W 25 1/ W Operating (Junction) Temperature Range Lead Temperature (soldering, 10 sec) Storage Temperature Range Power 1/ Based on pass transistor limitations of (VIN - VO) x IO and JC < 1C/W with 25C max TJ rise and TC = +125C. NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only; functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions" may effect device reliability. RECOMMENDED OPERATING CONDITIONS PARAMETER RANGE UNITS 1.0 to 3.3 -55 to +125 VDC C 0 to 7.5 A VBIAS 3.3 to 5.5 1/ VDC VIN 1.8 to 5.5 2/ VDC Output Voltage Range Case Operating Temperature Range Output Current 1/ VBIAS must maintain a level equal or above VIN but not fall below 3.3V 2/ Depending upon VOUT setting. ELECTRICAL PERFORMANCE CHARACTERISTICS 1/ PARAMETER SYM Reference Voltage VREF VIN = VBIAS = 5V, ENABLE = 0, 0A < IOUT < 7.5A Line Regulation VOUT VIN 2V < VIN < 3V, VOUT = 1.0V, Load Regulation VOUT IOUT Ripple Rejection Ratio CONDITIONS MIN MAX UNITS 0.995 1.005 V - 0.2 %/V - 0.5 % 66 - dB 4.3V < VIN < 5.3V, VOUT = 3.3V, 0A < IOUT < 7.5A f = 120Hz, CLOAD = 47F - 0.5 V Adjustment Pin Current IADJ - 3 A Minimum Load Current IMIN - 0 mA Current Limit 2/ ICL 9.5 13.5 A Long Term Stability 3/ VOUT TIME - 1 % Supply Current (VBIAS) IBIAS - 15 mA Dropout Voltage VDROP @VOUT = 1%, 0A < IOUT < 7.5A Notes: 1/ Unless otherwise specified, these specifications apply for post radiation: VBIAS = VIN = 5V, VOUT = 3.3V, IOUT = 7.5A and -55C < Tc <+125C. 2/ Current Limit is adjustable as shown in Application Note 2, Figures 3 and 4. 3/ Not tested. Shall be guaranteed to the specified limits after 1000hr life test. SCD8691 Rev E 6/14/10 2 Aeroflex Plainview APPLICATION NOTE 1 BASIC SET-UP Setting the output voltage (VOUT): 4 VBIAS VBIAS 0.1F VRG8691/92 1 VIN 2 47F + 10 VIN VOUT 3 CURR. LIMIT 8 ENABLE 1/ 5 VOUT 11 12 CURR. LIMIT SLOW START + 7 R1 CLOAD 10F 0.1F ENABLE GND VSENSE 6 9 IADJ R2 VREF (=1V) To set the output voltage for a particular Vout: - Choose an R2 value. (Recommended value = 1k - Then use the following formula to determine the value of R1. R1 = R2 x VOUT - VREF (R2 x IADJ) + VREF , where VREF = 1v Table 1 shows example values for R1 and R2 to achieve some standard voltages. Table 2 shows the nominal current limit settings if the 'CURR. LIMIT' function (pin 8) is left open. Table 2 2/ Table 1 Example R1 & R2 for typical VOUT VOUT R2 R1 VIN ICL NOM 3.3V 1k 2.3k 5V 11.5A 2.5V 1k 1.5k 3.3V 7.5A 1.8V 1k 800 2.5V 5.7A 1.0V 1k 0 1.8V 4.1A Notes: 1/ ENABLE should be asserted after both VIN and VBIAS are applied. (See Application Note 3, Figure 5 for the configuration where a separate ENABLE control line is NOT required). 2/ ICL varies directly with VIN. (See Application Note 2 for adjusting the Current Limit, ICL). FIGURE 2 -SETTING OUTPUT VOLTAGE SCD8691 Rev E 6/14/10 3 Aeroflex Plainview APPLICATION NOTE 2 SETTING THE CURRENT LIMIT To Increase the Current Limit (ICL): 4 VBIAS VBIAS 0.1F VRG8691/92 1 VIN 2 47F + 8 R INC VIN VOUT 3 5 ENABLE 10 VOUT 11 12 ENABLE SLOW START + 7 R1 10F 0.1F CURR. LIMIT GND CLOAD VSENSE 6 9 IADJ VREF (=1V) R2 - If the 'CURR. LIMIT' function (pin 8) is left open, the ICL decreases from 11.5 A(NOM) as VIN is decreased from 5V (Table 3). Table 3 VIN RINC ICL NOM 5V Open 11.5 A 3.3V Open 7.5 A 2.5V Open 5.7 A 1.8V Open 4.1 A - To increase the current limit above the nominal setting for any VIN and ICL combination, use the following formula: RINC(K-OHMS) = ( 30 x VIN 30 x ICL - VIN 69 ) - To maintain ICL at the 11.5 A setting, for commonly found VIN voltages, apply RINC value found in Table 4. Table 4 VIN RINC ICL NOM 5V Open 11.5 A 3.3V 56k 11.5 A 2.5V 30k 11.5 A 1.8V 16k 11.5 A FIGURE 3 - INCREASING THE CURRENT LIMIT (ICL) SCD8691 Rev E 6/14/10 4 Aeroflex Plainview APPLICATION NOTE 2 (CONTINUED) SETTING THE CURRENT LIMIT To Decrease the Current Limit (ICL): 4 VBIAS VBIAS 0.1F VIN 2 R DEC VRG8691/92 1 47F + 10 VIN VOUT 3 CURR. LIMIT 8 ENABLE 5 VOUT 11 12 CURR. LIMIT SLOW START + 7 R1 CLOAD 10F 0.1F ENABLE GND VSENSE 6 9 IADJ VREF (=1V) R2 - As shown in Table 3, if the 'CURR. LIMIT' function (pin 8) is left open, the ICL decreases from 11.5 A(NOM) as VIN is decreased from 5V. - To achieve any ICL, less than nominal, use RDEC which can be calculated using the following formula: RDEC(K-OHMS) = ( 31 x VIN 69 x VIN - ICL 30 ) FIGURE 4 - DECREASING THE CURRENT LIMIT (ICL) SCD8691 Rev E 6/14/10 5 Aeroflex Plainview APPLICATION NOTE 3 START UP SEQUENCE Recommended Power Supply Sequencing Options: - OPTION 1: Controlling the ENABLE line with a Digital signal (TTL / CMOS compatible). - Prior to applying power, disable the regulator by setting the ENABLE control line to a HIGH state. - Apply VIN and VBIAS. 1/ - Wait until both VIN and VBIAS supplies have reached their operating levels. - Toggle the ENABLE control line to a LOW state to turn on VOUT of the regulator. - OPTION 2: Controlling the ENABLE line using the CDELAY feature. - Connect a CDELAY capacitor between VBIAS and the ENABLE as shown in Figure 5 below. 2/ - Apply VIN and VBIAS. 1/ - CDELAY causes the regulator to self-enable after VBIAS has reached operating level. NOTE: The ENABLE should always be asserted AFTER VIN and VBIAS have reached operating level. 4 VBIAS VBIAS 0.1F VRG8691/92 1 VIN 2/ 2 + CDELAY + 47F 1/ 10 VIN VOUT 3 8 5 VOUT 11 12 CURR. LIMIT SLOW START + 7 R1 CLOAD 10F 0.1F ENABLE GND VSENSE 6 9 IADJ VREF (=1V) R2 NOTES: 1/ VIN should be applied before VBIAS if the Slow Start feature is used. 2/ CDELAY capacitor of 10uF is adequate for VBIAS rise times of up to 50ms. FIGURE 5 - DELAYED ENABLE SCD8691 Rev E 6/14/10 6 Aeroflex Plainview APPLICATION NOTE 4 VOUT START UP RISE TIME CONTROL Utilizing the Slow Start option: When the VRG8691/92 is first powered up, using the Slow Start function controls the rate at which VOUT rises to the required voltage set by R1 and R2. Note: VIN should be applied before VBIAS when the Slow Start feature is used. 4 VBIAS VBIAS 0.1F 2 47F VRG8691/92 1 VIN + ENABLE 10 VIN VOUT 3 0 VOUT 11 12 + 8 CURR. LIMIT 5 ENABLE 7 SLOW START R1 10F 0.1F GND VSENSE 6 CLOAD + CSS 9 IADJ VREF (=1V) R2 If it is desirable to control the output rise time, a capacitor (CSS) can be asserted on the Slow Start pin to adjust the rise time for the following: A. Large load capacitance will cause high surge currents which will trip the current limit circuitry. The use of CSS will allow the output voltage to rise slowly thus mitigate the surge current phenomenon. VOUT NOM CSS > ICL - ILOAD NOM CLOAD X 0.4 X VBIAS 1300 B. CSS may be used solely to control VOUT RISE TIME (Tr), when CLOAD is not an issue. TR = CSS X 1300 X LN (V V BIAS BIAS - 2.5 ) Note: CSS in Farads and TR in seconds. C. CSS is effective only when VIN is applied prior to VBIAS or ENABLE. FIGURE 6 - SLOW START SCD8691 Rev E 6/14/10 7 Aeroflex Plainview PIN NUMBERS vs FUNCTION PIN FUNCTION PIN FUNCTION 1 VIN 7 Slow Start 2 VIN 8 Current Limit 3 VIN 9 VSENSE 4 VBIAS 10 VOUT 5 ENABLE 11 VOUT 6 GROUND 12 VOUT Notes: 1. Dimension Tolerance: .005 inches 2. Package contains BeO substrate 3. Case electrically isolated FIGURE 3 - PACKAGE OUTLINE -- VRG8691 THRU-HOLE POWER PACKAGE SCD8691 Rev E 6/14/10 8 Aeroflex Plainview PIN NUMBERS vs FUNCTION PIN FUNCTION PIN FUNCTION 1 VIN 7 Slow Start 2 VIN 8 Current Limit 3 VIN 9 VSENSE 4 VBIAS 10 VOUT 5 ENABLE 11 VOUT 6 GROUND 12 VOUT Notes: 1. Dimension Tolerance: .005 inches 2. Package contains BeO substrate 3. Case electrically isolated FIGURE 4 - PACKAGE OUTLINE -- VRG8692 SURFACE MOUNT POWER PACKAGE SCD8691 Rev E 6/14/10 9 Aeroflex Plainview ORDERING INFORMATION MODEL DSCC SMD # SCREENING PACKAGE VRG8691-S - Military Temperature, -55C to +125C Screened in accordance with MIL-PRF-38534, Class K VRG8691-7 - Commercial Flow, +25C testing only VRG8692-S - Military Temperature, -55C to +125C Screened in accordance with MIL-PRF-38534, Class K VRG8692-7 - Commercial Flow, +25C testing only VRG8691-201-1S VRG8691-201-2S 5962-0923701KXC 5962-0923701KXA In accordance with DSCC SMD 12 Lead Thru-Hole Power Pkg VRG8692-201-1S VRG8692-201-2S 5962-0923701KYC 5962-0923701KYA In accordance with DSCC SMD 12 Lead Surface Mount Power Pkg 12 Lead Thru-Hole Power Pkg 12 Lead Surface Mount Power Pkg EXPORT CONTROL: EXPORT WARNING: This product is controlled for export under the International Traffic in Arms Regulations (ITAR). A license from the U.S. Department of State is required prior to the export of this product from the United States. Aeroflex's military and space products are controlled for export under the International Traffic in Arms Regulations (ITAR) and may not be sold or proposed or offered for sale to certain countries. (See ITAR 126.1 for complete information.) PLAINVIEW, NEW YORK Toll Free: 800-THE-1553 Fax: 516-694-6715 INTERNATIONAL Tel: 805-778-9229 Fax: 805-778-1980 NORTHEAST Tel: 603-888-3975 Fax: 603-888-4585 SE AND MID-ATLANTIC Tel: 321-951-4164 Fax: 321-951-4254 WEST COAST Tel: 949-362-2260 Fax: 949-362-2266 CENTRAL Tel: 719-594-8017 Fax: 719-594-8468 www.aeroflex.com info-ams@aeroflex.com Aeroflex Microelectronic Solutions reserves the right to change at any time without notice the specifications, design, function, or form of its products described herein. All parameters must be validated for each customer's application by engineering. No liability is assumed as a result of use of this product. No patent licenses are implied. Our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused SCD8691 Rev E 6/14/10 10