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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 @ 25C
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . - 55C to + 150C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to + 150C 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 = 25C unless otherwise noted)
Parameter Reference Voltage Conditions IOUT = 10 mA, Tj = 25C (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 = 25C 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 = 25C (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 F Tantalum IOUT - IFULL LOAD (VIN - VOUT) = 3 V Adjust Pin Current Adjust Pin Current Change TJ = 25C 10mA IOUT IFULL LOAD 1.5 V (VIN - VOUT) 25 V Temperature Stability Long Term Stability Thermal Resistance TO-257AA/D2 Pac TO-258AA -55C TJ +150C TA = 125C, 1000 Hrs. Junction-to-Case 60 (VIN - VOUT) = 25 V TA = 25C, 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 A
3.3
0.2 0.5 0.3
5
A %
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 = -55C TJ = 25C TJ = 150C
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 = 25C
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 = -55C
-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 = 150C TJ = 25C
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 = 25C
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 = 150C TJ = 25C
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 = 25C
TJ = -55C
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 = -55C
3.3
Minimum Input/Output Differential (V)
2
0.10 Output Voltage Deviation (%)
I = 3A TJ = 150C TJ = 25C
0.05 0 -0.05 -0.10 -0.15 -0.20 -50 -25 0 25 50 75 100 125 150 Temperature (C)
1
TJ = 25C
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 150F aluminum electrolytic or a 22F 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 150F or 22F 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 22F tantalum or 150F 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 10F 10F Output 10F Tantalum, 50F Aluminum 22F Tantalum, 150F Aluminum Adjustment None 20F
Normally, capacitor values on the order of 100F 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 A R2 VOUT = VREF + R1 + IADJ R2 VOUT VREF R1
(1
)
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 177-189C. 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

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