Standard Products
VRG8653/VRG8654
Dual Voltage Regulator, 3.0 Amp, Positive & Negative
Low Dropout (LDO), Adjustable
Radiation Tolerant
www.aeroflex.com/voltreg
October 27, 2011
FEATURES
❑
❑
❑
❑
❑
Manufactured using
Linear Technology Corporation
®
Space Qualified RH1084 and RH1185 die
❑
Packaging
– Hermetic metal
Radiation performance
– Thru-hole or Surface mount
- Total dose > 100 krad (Si)
– 8 Leads, .755"L x .415"W x .200"Ht
Two-Independent voltage regulators
– Power package
Thermal shutdown
– Weight - 6 gm max
Adjustable Output Voltages
❑
Designed for aerospace and high reliability space
applications
Positive
regulator features (RH1084)
– Output voltage adjustable: 1.25V to 23V
– Dropout voltage: 1.80V at 3.0A
– 3-Terminal
– Output current: 3.0A
– Voltage reference: 1.25V +2%, -3.2%
– Load regulation: 0.35% max
– Line regulation: 0.25% max
– Ripple rejection: >60dB
❑
❑
Negative
regulator features (RH1185)
– Output voltage adjustable: -2.37 to -25V
– Dropout voltage: 1.05V at 3.0A
– 5-Terminal
– Output current: 3.0A
– Voltage reference: -2.370V ±3.5%
– Load regulation: 0.8% max
– Line regulation: 0.02% max
– Ripple rejection: >60dB
❑
Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The Aeroflex Plainview VRG8653/54 consists of one Positive Adjustable (RH1084) and one Negative Adjustable
(RH1185) LDO voltage regulator, both capable of supplying 3.0Aover the output voltage range as defined under
recommended operating conditions. The VRG8653/54 offers excellent line and load regulation specifications and
ripple rejection. There is full electrical isolation between the regulators and each regulator to the package.
Dropout (V
IN
- V
OUT
) decreases at lower load currents for both regulators.
The VRG8653/54 serves a wide variety of applications including SCSI-2 Active Terminator, High Efficiency Linear
Regulators, Post Regulators for Switching Supplies, Constant Current Regulators, Battery Chargers and
Microprocessor Supply.
The VRG8653/54 has been specifically designed to meet exposure to radiation environments. The VRG8653 is
configured for a Thru-Hole 8 lead metal power package and the VRG8654 is configured for a Surface Mount 8 lead
metal power package. It is guaranteed operational from -55°C to +125°C. Available screened in accordance with
MIL-PRF-38534, the VRG8653/54 is ideal for demanding military and space applications.
For detailed performance characteristic curves, applications information and typical applications see the
latest
Linear Technology Corporation
®
data sheets for their RH/LT1084 and RH/LT1185, which is available
on-line at www.linear.com.
1
A
DJ
RH1084
7
V
OUT
V
OUT
RH1185
V
IN
REF
FB
V
IN
8
Positive
Regulator
Negative
Regulator
GND
5
3
4
2
6
SCD8653 Rev C
FIGURE 1 – SCHEMATIC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Lead temperature (soldering 10 Sec)
Input Output Differential
Load Current, maximum
Feedback & Reference Voltage
Output Voltage
ESD (MIL-STD-883, M3015, Class 2)
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance, Junction to case
jc
25
+6.0
-
+25
2000 to 3999
-55 to +150
-65 to +150
5
RANGE
RH1084
+25
300
30
-4.5
-7
-30
RH1185
-35
UNITS
V
DC
C
V
DC
A
V
DC
V
DC
V
C
C
°C/W
NOTICE: Stresses above those listed under "Absolute Maximums Rating" may cause permanent damage to the device. These are stress rating
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
Output Voltage Range
Input Output Differential
Case Operating Temperature Range
RANGE
RH1084
1.25 to 23
1.8 to 24
-55 to +125
RH1185
-2.37 to -25
1.05 to 29
UNITS
V
DC
V
DC
°C
ELECTRICAL PERFORMANCE CHARACTERISTICS
U
NLESS OTHERWISE SPECIFIED
: -55°C
T
C
+125°C
CONDITIONS (P
P
MAX
PARAMETER
SYM
MIN
MAX
UNITS
RH1084 Positive LDO section only 1/
Reference Voltage 2/, 3/
Line Regulation 2/, 3/
Load Regulation 2/, 3/
Dropout Voltage 2/, 4/
Adjust Pin Current 2/
Adjust Pin Current Change 2/
Minimum Load Current 5/
Current Limit
Ripple Rejection 3/
Thermal Regulation
V
REF
Long-Term Stability 5/
SCD8653 Rev C 10/27/11
V
REF
1.5V < (V
IN
- V
OUT
)< 15V, 10mA < I
OUT
< 3.0A
1.210
-
-
-
-
1.275
0.25
0.35
1.8
120
5
10
V
%
%
V
µA
µA
mA
A
V
OUT
I
LOAD
= 10mA, 1.5V < (V
IN
- V
OUT
) < 15V
V
IN
V
OUT
10mA < I
OUT
< 3.0A, (V
IN
- V
OUT
) = 3V
I
OUT
V
DROP
V
REF
= 1%, I
OUT
= 3.0A
-
-
I
MIN
I
CL
-
-
-
10 mA < I
OUT
< 3.0A, 1.5V < (V
IN
- V
OUT
) < 15V
(V
IN
- V
OUT
) = 25V
(V
IN
- V
OUT
) = 5V
I
OUT
= 3.0A, (V
IN
- V
OUT
) = 3V, f = 120Hz,
C
ADJ
= C
OUT
= 25µF
30ms pulse, T
C
= +25°C
Burn In: T
C
= +125°C @ 1000hrs minimum, tested @ 25°C
2
-
-
5.25
60
-
-
-
0.015
1.0
dB
%/W
%
Aeroflex Plainview
ELECTRICAL PERFORMANCE CHARACTERISTICS (con’t)
U
NLESS OTHERWISE SPECIFIED
: -55°C
T
C
+125°C
CONDITIONS (P
P
MAX
PARAMETER
SYM
MIN
MAX
UNITS
RH1185 Negative LDO section only 9/
Reference Voltage
(At pin 6) 2/
Dropout Voltage 2/, 6/
V
REF
1mA < I
OUT
< 3A, V
IN
- V
OUT
= 1.2V to 28V, V
OUT
= -5V
I
OUT
= 0.5A, V
OUT
= -5V
V
DROP
I
OUT
= 3A, V
OUT
= -5V
Line Regulation 2/, 10/
Load Regulation 2/, 10/
-
-
-
-
3.3
2.0
1.0
0.2
2.7
0.9
-
-
-
60
-
1.05
0.02
0.8
-4.50
4.55
4.5
3.1
1.6
3.7
1.6
3.5
35
21
-
0.014
V
%/V
%
V
A
A
A
A
A
A
mA
mA/A
mA/A
dB
%/W
-2.29
-
-2.45
0.425
V
V
V
OUT
V
IN
V
OUT
I
OUT
1.0V < V
IN
- V
OUT
< 20V, V
OUT
= -5V
5mA < I
OUT
< 3A, V
IN
- V
OUT
= 1.5V to 10V, V
OUT
= -5V
Minimum Input Voltage 2/, 7/ V
IN MIN
I
OUT
= 3A , V
OUT
= V
REF
1.5V < V
IN
- V
OUT
< 10V
Internal Current Limit (See
Graph for Guaranteed Curve -
See Figure 6) 2/, 13/
V
IN
- V
OUT
= 15V
I
CL
V
IN
- V
OUT
= 20V
V
IN
- V
OUT
= 30V 5/
R
LIM
= 5K
, (V
IN
- V
OUT
) = 1.5V 12/
External Current Limit 2/
Quiescent Supply Current
2/, 8/
I
LIM
I
Q
I
Q
-
-
R
LIM
= 15K
, (V
IN
- V
OUT
) = 1.5V 12/
I
OUT
= 5mA, V
OUT
= V
REF
, -4V < V
IN
< -25V
V
IN
– V
OUT
= V
SAT
11/
V
IN
– V
OUT
2V
I
OUT
= 3.0A, V
IN
- V
OUT
= 3V, f = 120Hz,
V
IN
–V
OUT
= 10V, I
OUT
= 5mA to 2A, T
C
= +25°C
Supply Current
Change with Load 2/
Ripple Rejection
Thermal Regulation (See
application information
LT1185) 5/
Notes
1/ The manufacturer’s output current rating for the RH1084MK positive regulator integrated circuit is 5.0 Amps. For Compliance with the
Current Density specifictation of MIL-STD-883 Rev. C, the electrical performance characteristics are specified at an output current of 3.0
Amps.
2/ Specification derated to reflect total dose exposure to 100krads (Si) at +25°C.
3/ Line and load regulation are guaranteed up to the maximum power dissipation of 25W. Power dissipation is determined by the input/output
differential voltage and the output current. Guaranteed maximum power dissipation will not be available over the full input/output voltage
range.
4/ Dropout voltage is specified over the full output current range of the device.
5/ Not tested. Shall be guaranteed by design, characterization, or correlation to other tested parameters.
6/ Dropout voltage is tested by reducing input voltage until the output drops 1% below its nominal value. Tests are done at 0.5A and 3A. The
power transistor looks basically like a pure resistance in this range so that minimum differential at any intermediate current can be
calculated by interpolation; V
DROPOUT
= 0.25V + (0.25 x I
OUT
). For load current less than 0.5A, see Figure 4.
7/ “Minimum input voltage” is limited by base emitter voltage drive of the power transistor section, not saturation as measured in Note 6. For
output voltages below 4V, “minimum input voltage” specification may limit dropout voltage before transistor saturation limitation.
8/ Supply current is measured on the ground pin, and does not include load current, R
LIM
, or output divider current.
9/ The 25W power level is guaranteed for an input-output voltage of 8.3V to 17V. At lower voltages the 3A limit applies, and at higher
voltages the internal power limiting may restrict regulator power below 25W.
10/ Line and load regulation are measured on a pulse basis with a pulse width of 2ms, to minimize heating. DC regulation will be affected by
thermal regulation and temperature coefficient of the reference.
11/ V
SAT
is the maximum specified dropout voltage; 0.25V +(0.25 x I
OUT
).
12/ Current limit is programmed with a resistor from REF pin to GND pin. R
LIM
= 15K/I
LIM
.
13/ Pulsed @ <10% duty cycle @ +25°C
SCD8653 Rev C 10/27/11
3
Aeroflex Plainview
60
50
40
Maximum Power
Dissipation
(Watts)
30
20
Both Regulators
1 Regulator
10
0
0
20
40
60
80
100
120
140
Case Temperature (°C)
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
The maximum Power dissipation is limited by the thermal shutdown function of each regulator chip in the VRG8653/54. The
graph above represents the achievable power before the chip shuts down. The first line in the graph represents the maximum
power dissipation of the VRG8653/54 with one regulator on (the other off) and the other line represents both regulators on
dissipating equal power. If both regulators are on and one regulator is dissipating more power that the other, the maximum power
dissipation of the VRG8653/54 will fall between the two lines. This graph is based on the maximum junction temperature of
150°C and a thermal resistance (
JC
) of 5°C/W.
SCD8653 Rev C 10/27/11
4
Aeroflex Plainview
FIGURE 3 – RH1084 DROPOUT VOLTAGE
TYPICAL CURVE
FIGURE 4 – RH1185 DROPOUT VOLTAGE
TYPICAL CURVE
See Note 1/, pg 3.
FIGURE 5 – RH1084 SHORT CIRCUIT CURRENT
FIGURE 6 – RH1185 INTERNAL CURRENT LIMIT
SCD8653 Rev C 10/27/11
5
Aeroflex Plainview
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