OM183SC

OM183SC OM185ST OM184SC OM186ST OM185SR OM186SR 7.5A, 5A, 3A, 1.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATORS Three Terminal Adjustable Low Dropout TO-257/TO-258 Positive Voltage Regulators FEATURES • • • • • • Operates Down to 1V Dropout, 1.5V @ Max. Current .015% Line Regulation .01% Load Regulation 1% Reference Voltage Hermetic TO-257 and TO-258 Isolated Packages Electrically Equivalent to LT1083, 84, 85 and 86 DESCRIPTION These three terminal positive adjustable voltage regulators are designed to provide 7.5A, 5A, 3A, and 1.5A with higher efficiency than conventional voltage regulators. The devices are designed to operate to 1 Volt input to output differential and the dropout voltage is specified as a function of load current. All devices are pin compatible with older three terminal regulators. Supplied in the easy-to-use hermetic metal TO-257 and TO-258 JEDEC packages also supplied in Omnirel’s new surface mount D2 Pac.. These devices are ideally suited for Military applications where small size, hermeticity and high reliability are required. ABSOLUTE MAXIMUM RATINGS @ 25°C Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . - 55°C to + 150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65°C to + 150°C Output Current - OM183SC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 A OM184SC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 A OM185ST/SR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A OM186ST/SR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A 3.3 Note: OM183SC and OM184SC products are packaged in the TO-258 Package (7.5A & 5A). OM185ST and OM186ST products are packaged in the TO-257 Package (3A & 1.5A). 0 03 R3 Supersedes 4 11 R2 3.3 - 1 OM183SC - OM186ST - OM186SR ELECTRICAL CHARACTERISTICS (TC = 25°C unless otherwise noted) Parameter Reference Voltage Conditions IOUT = 10 mA, Tj = 25°C (VIN - VOUT) = 3 V 10mA ≤ IOUT ≤ IFULL LOAD 1.5 V ≤ (VIN - VOUT) ≤ 25 V (Note 3) Line Regulation ILOAD = 10 mA, 1.5 V ≤ (VIN - VOUT) ≤ 15 V, Tj = 25°C 1.220 1.250 0.015 0.035 1.270 0.2 0.2 V % % 1.238 1.250 1.262 V Min. Typ. Max. Units 15 V ≤ (VIN - VOUT) ≤ 35 V (Notes 1 & 2) Load Regulation (VIN - VOUT) = 3 V 10 mA ≤ IOUT ≤ IFULL LOAD Tj = 25°C (Notes 1, 2, 3) Dropout Voltage Current Limit OM183SC (VIN - VOUT) = 5 V (VIN - VOUT) = 25 V OM184SC (VIN - VOUT) = 5 V (VIN - VOUT) = 25 V OM185ST/SR (VIN - VOUT) = 5 V (VIN - VOUT) = 25 V OM186ST/SR (VIN - VOUT) = 5 V (VIN - VOUT) = 25 V Minimum Load Current Thermal Regulation OM183SC OM184SC OM185ST/SR OM186ST/SR Ripple Rejection f = 120 Hz CADJ = 25 µF Tantalum IOUT - IFULL LOAD (VIN - VOUT) = 3 V Adjust Pin Current Adjust Pin Current Change TJ = 25°C 10mA ≤ IOUT ≤ IFULL LOAD 1.5 V ≤ (VIN - VOUT) ≤ 25 V Temperature Stability Long Term Stability Thermal Resistance TO-257AA/D2 Pac TO-258AA -55°C ≤ TJ ≤ +150°C TA = 125°C, 1000 Hrs. Junction-to-Case 60 (VIN - VOUT) = 25 V TA = 25°C, 30 ms pulse Guaranteed by design ∆VREF = 1%, IOUT = IFULL LOAD 0.05 0.5 % 0.5 .8 1.3 0.8 1.0 1.5 % % V 8.0 0.4 5.5 0.3 3.2 0.2 1.5 0.75 5 10 A A A A A A A A mA 0.002 0.003 0.004 0.010 0.01 0.15 0.02 0.05 %/W %/W %/W %/W 75 55 dB µA 3.3 0.2 0.5 0.3 5 µA % 1 % 4.2 2.75 °C/W °C/W Note 1: Load and line 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 (OM183/60W, OM184/45W, OM185/30W, OM186/15W). Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output voltage range. Note 3: IFULL LOAD curve is defined as the minimum value of current limit as a function of input to output voltage. Note that power dissipation is only achievable over a limited range of input to output voltage. Note 4: Dropout voltage is specified over the full output current range of the device. 3.3 - 2 OM183SC - OM186ST - OM186SR TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input/Output Differential (V) OM183SC Dropout Voltage 2 Short Circuit Current (A) 12 10 8 6 TJ = -55°C TJ = 25°C TJ = 150°C OM183SC Short Circuit Current 0.10 Output Voltage Deviation (%) 0.05 0 -0.05 -0.10 -0.15 OM183SC Load Regulation I = 7.5A 1 TJ = 25°C 4 2 0 0 5 IFULL LOAD 0 0 1 2 3 4 5 6 7 8 9 10 Output Current (A) 10 15 20 25 30 35 Input/Output Differential (V) OM184SC Short Circuit Current 10 9 8 6 6 5 4 3 2 1 0 TJ = -55°C -0.20 -50 -25 0 25 50 75 100 125 150 Temperature (°C) OM184SC Load Regulation 0.10 Output Voltage Deviation (%) I = 5A Minimum Input/Output Differential (V) OM184SC Dropout Voltage 2 Short Circuit Current (A) TJ = 150°C TJ = 25°C 0.05 0 -0.05 -0.10 -0.15 -0.20 -50 -25 0 25 50 75 100 125 150 Temperature (°C) OM185ST Load Regulation 0.10 1 TJ = 25°C IFULL LOAD 0 0 1 2 3 4 5 6 0 5 10 15 20 25 30 35 Output Current (A) OM185ST Dropout Voltage 2 Short Circuit Current (A) 6 5 4 3 2 1 Input/Output Differential (V) OM185ST Short Circuit Current Output Voltage Deviation (%) Minimum Input/Output Differential (V) I = 3A TJ = 150°C TJ = 25°C 0.05 0 -0.05 -0.10 -0.15 -0.20 -50 -25 0 25 50 75 100 125 150 Temperature (°C) OM186ST Load Regulation 1 TJ = 25°C TJ = -55°C IFULL LOAD 0 0 0 1 2 3 4 0 5 10 15 20 25 30 35 Output Current (A) OM186ST Dropout Voltage Input/Output Differential (V) OM186ST Short Circuit Current 3.0 Short Circuit Current (A) 2.5 2.0 1.5 1 .5 IFULL LOAD TJ = -55°C 3.3 Minimum Input/Output Differential (V) 2 0.10 Output Voltage Deviation (%) I = 3A TJ = 150°C TJ = 25°C 0.05 0 -0.05 -0.10 -0.15 -0.20 -50 -25 0 25 50 75 100 125 150 Temperature (°C) 1 TJ = 25°C 0 0 1 Output Current (A) 2 0 0 5 10 15 20 25 30 Input/Output Differential (V) 35 3.3 - 3 OM183SC - OM186ST - OM186SR APPLICATION NOTES Stability The OM183-186 Series requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 150µF aluminum electrolytic or a 22µF solid tantalum on the output will ensure stability. Normally, capacitors much smaller than this can be used. Many different types of capacitors with widely varying characteristics are available. These capacitors differ in capacitor tolerance (sometimes ranging up to ±100%), equivalent series resistance, and capacitance temperature coefficient. The 150µF or 22µF values given will ensure stability. When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. The values of 22µF tantalum or 150µF aluminum cover all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal, smaller capacitors can be used with equally good results and the table below shows approximately what size capacitors are needed to ensure stability. Recommended Capacitor Values Input 10µF 10µF Output 10µF Tantalum, 50µF Aluminum 22µF Tantalum, 150µF Aluminum Adjustment None 20µF Normally, capacitor values on the order of 100µF are used in the output of many regulators to ensure good transient response with heavy load current changes. Output capacitance can be increased without limit and larger values of output capacitor further improve stability and transient response of the OM183SC regulators. Output Voltage — Adjustable Regulators The OM183-OM186 devices develop a 1.25V reference voltage between the output and the adjust terminal (see below). By placing a resistor, R1, between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is the specified minimum load current of 10mA. Because IADJ is very small and constant when compared with the current through R1, it represents a small error and can usually be ignored. VIN IN OM183SC OUT ADJ IADJ 50 µA R2 VOUT = VREF 1+ R1 + IADJ R2 VOUT VREF R1 ( ) R2 Basic Adjustable Regulator MECHANICAL SPECIFICATIONS P/N OM183SC and OM184SC JEDEC TO-258AA .165 .155 .695 .685 .270 .240 .045 .035 .835 .815 .707 .697 .550 .530 1 .092 MAX. .750 .500 .065 .055 .140 TYP. .005 2 3 Pin 1 - Adjust Pin 2 - VOUT Pin 3 - VIN .200 TYP. P/N OM185ST and OM186ST JEDEC TO-257AA .420 .410 .200 .190 .045 .035 .665 .645 .537 .527 .430 .410 .038 MAX. 3.3 .150 .140 .750 .500 .005 Pin 1 - Adjust Pin 2 - VOUT Pin 3 - VIN 1 2 3 .035 .025 .100 TYP. .120 TYP. 205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246 OM183SC - OM186ST - OM186SR MECHANICAL OUTLINE SOLDERING FOOTPRINT 123 Pin 1: Pin 2: Pin 3: Case Adjust Vout Vin N/C TYPICAL SOLDERING PROFILE Figure 1 shows a typical soldering profile for the D2 and D3 Packages when soldering a to a printed circuit board. The profile will vary from system to system and solders to solders. Factors that can affect the profile include the type of soldering system used, density and type of components on the board or substrate material being used. This profile shows temperature versus time. The two profiles described are based on a high density and a low density board. The type solder used was 62/36/2 Tin Lead Silver with a melting point between 177-189ºC. An convection/infrared soldering reflow system was used. The circuit and solder joints heat up first due to their mass followed by the components which typically run 30 degrees cooler than the solder joints. TYPICAL HEATING PROFILE PART NUMBER DESIGNATOR OM 183 S R M Omnirel Device Type Isolated Package Package Style Hi-Rel Screening Level 205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246