Standard Products
VRG8666
Voltage Regulator, 1.0 Amp, Positive
Ultra Low Dropout (ULDO), Adjustable
Radiation Tolerant
www.aeroflex.com/voltreg
January 10, 2012
FEATURES
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Manufactured using
Space Qualified RH3080 die
Radiation performance
Total dose: 100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
Current Limit with Foldback and Over-temperature protection
Output voltage adjustable: 0V to 36V
Outputs may be paralleled for higher current
Post Radiated Dropout voltage:
0.60V @ 1.0Amps
0.39V @ 0.5Amps
Output current: 1.0A
Packaging – Hermetic Ceramic
Hermetic Surface Mount Power
5 Pads, .545"L x .296"W x .120"Ht
Weight - 2.0 gm max
Designed for aerospace and high reliability space applications
Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The Aeroflex Plainview VRG8666 consists of a Positive Adjustable (RH3080) ULDO voltage regulator
capable of supplying 1.0Amps over the output voltage range as defined under recommended operating
conditions. The VRG8666 offers excellent line and load regulation specifications and ripple rejection.
Dropout (V
IN
- V
OUT
) decreases at lower load currents.
The VRG8666 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 VRG8666 has been specifically designed to meet exposure to radiation environments and is configured
for an SMD power package. It is guaranteed operational from -55°C to +125°C. Available screened to
MIL-STD-883, the VRG8666 is ideal for demanding military and space applications.
3
SET
5
OUT
V
CONTROL
RH3080
Positive Regulator
4
2
SENSE
IN
1
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
SCD8666 Rev C
ABSOLUTE MAXIMUM RATINGS
Parameter
Input Voltage, V
CONTROL
(Voltages are Relative to V
OUT
)
Output Short Circuit Duration
Lead temperature (soldering 10 Sec)
Input Output Differential
Output Voltage
ESD
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance (Junction to Case)
JC
Range
+40, -0.3
Indefinite
300
26
+36
2000 1/
-55 to +150
-65 to +150
5
Units
V
DC
-
°C
V
DC
V
DC
V
°C
°C
°C/W
1/ Meets ESD testing per MIL-STD-883, method 3015, Class 2.
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
Input Voltage (Voltages are Relative to V
OUT
)
V
CONTROL
(Voltages are Relative to V
OUT
)
Range
0 to 35
0.5 to 26
-55 to +125
1 to 36
2 to 36
Units
V
DC
V
DC
°C
V
V
ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified: -55°C < Tc < +125°C.
Parameter
Set Pin Current 1/
Output Offset Voltage
(V
OUT
- V
SET
) 1/
Line Regulation 1/
Symbol
I
REF
V
OS
Conditions (P < P
MAX
)
V
IN
= 1V, V
CONTROL
= 2V, I
LOAD
= 1mA
V
IN
= 1V, V
CONTROL
= 2V, I
LOAD
= 1mA,
1V < V
IN
< 26V, 2V < V
CONTROL
< 26V,
I
LOAD
= 1mA, T
J
= +25C
1V < V
IN
< 26V, 2V < V
CONTROL
< 26V, I
LOAD
= 1mA 4/
(V
IN
- V
OUT
) = 3V, I
LOAD
= 1mA to 0.1A
I
LOAD
= 1mA to 1A 4/
I
LOAD
= 0.1A
I
LOAD
= 0.1A
V
IN
= V
CONTROL
= +5V, V
SET
= 0V , V
OUT
= -0.1V
V
IN
= V
CONTROL
= 26V, V
OUT
= 0.1V
I
LOAD
= 0.2A, (V
IN
- V
OUT
) = 3V, f = 120Hz,
C
OUT
= 2.2µF, C
SET
= 0.1µF
30ms pulse, T
C
= +25°C
MIN
9.8
-9.0
-0.15
-0.9
-1.4
-25
-
-
1.1
-
60
-
MAX
10.2
9.0
0.15
0.9
1.4
25
1.60
0.25
-
1.0
-
0.03
Units
µA
mV
mV/V
nA/V
mV
nA
V
A
mA
dB
%/W
V
OS
I
SET
V
OS
I
SET
V
DROP
I
MAX
I
MIN
-
-
Load Regulation 1/
V
CONTROL
Dropout Voltage
1/, 2/
V
IN
Dropout Voltage 1/, 2/
Current Limit 1/, 3/
Minimum Load Current 1/
Ripple Rejection
Thermal Regulation
Notes:
1/ Specification derated to reflect Total Dose exposure to 100 Krad (Si) @+25°C.
2/ Dropout results from either minimum control voltage, V
CONTROL
, or minimum input voltage, V
IN
, both specified with respect to
V
OUT
. These specifications represent the minimum input-to-output differential voltage required to maintain regulation.
3/ Pulsed @ <10% duty cycle @ +25°C for characterization only. (See note 1/).
4/ Not tested. Shall be quaranteed to the specified limits.
SCD8666 Rev C 1/10/12
2
Aeroflex Plainview
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
The maximum Power dissipation is limited by the thermal shutdown function of the regulator chip in the VRG8666.
The graph above represents the achievable power before the chip shuts down. The line in the graph represents the
maximum power dissipation of the VRG8666 This graph is based on the maximum junction temperature of 150°C
and a thermal resistance (
JC
) of 5°C/W.
SCD8666 Rev C 1/10/12
3
Aeroflex Plainview
See Note 1, pg 2.
See Note 4, pg 2.
FIGURE 3 – RH3080 CURRENT LIMIT
FIGURE 4 – RH3080 TYPICAL DROPOUT
VOLTAGE CURVE
Vout
Rset = -------------
-
10uA
FIGURE 5 – BASIC VRG8666 ADJUSTABLE REGULATOR APPLICATION
SCD8666 Rev C 1/10/12
4
Aeroflex Plainview
Pin 1
Epoxy Dot
(on side)
.301
MAX
.095
4 Places
R.025 MAX
6 Places
.030 MIN
.005
4
1
.120
4 Places
.550
MAX
.030
MIN
5
.200
.005
.030
MIN
3
2
4X R.020
.015
3 Places
.127
MAX
.150
.005
.005
.286
NOTES:
1. Package & Lid are electrically isolated from signal pads
FIGURE 6 – PACKAGE OUTLINE — SURFACE MOUNT
SCD8666 Rev C 1/10/12
5
Aeroflex Plainview
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