Standard Products
VRG8662
Low Drop Out(LDO)Adjustable Regulator
Positive Voltage
Radiation Tolerant
www.aeroflex.com/voltreg
January 7, 2009
FEATURES
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Manufactured using
Linear Technology Corporation
®
Space Qualified RH1086 die
Radiation performance
- Total dose: 100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
Thermal shutdown
Output voltage adjustable: 1.25V to 23V
Dropout voltage: 1.55V at 1.0Amps
3-Terminal
Output current: 1.0A (See Note 1, pg 2)
Voltage reference: 1.25V +2%, -3.2%
Load regulation: 0.4% max
Line regulation: 0.25% max
Ripple rejection: >60dB
Packaging – Hermetic Ceramic
- SMD-0.5 Surface mount
- 3 Pads, .301"W x .405"L x .130"Ht max
- Power package
- Weight - 2 gm max
Designed for aerospace and high reliability space applications
DSCC SMD 5962-09207 pending
Note: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program.
DESCRIPTION
The Aeroflex Plainview VRG8662 consists of a Positive Adjustable (RH1086) LDO voltage regulator capable of
supplying 1.0Amps over the output voltage range as defined under recommended operating conditions. The VRG8662
offers excellent line and load regulation specifications and ripple rejection. Dropout (V
IN
- V
OUT
) decreases at lower
load currents.
The VRG8662 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 VRG8662 has been specifically designed to meet exposure to radiation environments and is configured for a
SMD-0.5 SMT power package. It is guaranteed operational from -55°C to +125°C. Available screened to
MIL-STD-883, the VRG8662 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/LT1086, which is available on-line at
www.linear.com.
3
ADJ
1
V
OUT
RH1086
Positive
Regulator
V
IN
2
SCD8662 Rev B
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Lead temperature (soldering 10 Sec)
Input Output Differential
Output Voltage
ESD
Operating Junction Temperature Range
Storage Temperature Range
RANGE
+25+V
REF
300
25
+25
4000
1/
-55 to +150
-65 to +150
UNITS
V
DC
°C
V
DC
V
DC
V
°C
°C
1/ Meets ESD testing per MIL-STD-883, method 3015, Class 3A.
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
1.25 to 23
1.5 to 25
-55 to +125
UNITS
V
DC
V
DC
°C
ELECTRICAL PERFORMANCE CHARACTERISTICS 2/
PARAMETER
Reference Voltage 3/
Line Regulation 3/
Load Regulation 3/
Dropout Voltage 4/
Adjust Pin Current
Adjust Pin Current Change
Current Limit
Minimum Load Current 5/
Ripple Rejection 3/
Thermal Regulation
V
REF
Long-Term Stability 5/
Thermal Resistance
(Junction to Case)
I
MAX
I
MIN
10 mA < I
OUT
< 1A, 1.5V < V
IN
- V
OUT
< 15V
V
IN
- V
OUT
= 5V
V
IN
- V
OUT
< 25V
V
IN
- V
OUT
= 25V
I
OUT
= 1.0A, (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 min. Tested at +25°C only.
SYM
V
REF
CONDITIONS (P
≤
P
MAX
)
10mA < I
OUT
< 1.0A, 1.5V < V
IN
- V
OUT
< 15V
MIN
1.210
-
-
-
-
-
1.0
0.047
-
60
-
-
-
MAX
1.275
0.25
0.40
1.55
120
5
-
-
10
-
0.04
0.30
3
UNITS
V
%
%
V
µA
µA
A
A
mA
dB
%/W
%
°C/W
Δ
V
OUT
I
LOAD
= 10mA, Tj = +25°C,
Δ
V
IN
1.5V < V
IN
- V
OUT
< 15V
Δ
V
OUT
Δ
I
OUT
V
DROP
10mA < I
OUT
< 1.0A, (V
IN
- V
OUT
) = 3V
Δ
V
REF
= 1%, I
OUT
= 1.0A
Θ
JC
Notes:
1. For Compliance with MIL-STD-883 Rev. C current density specification, the RH1086MK is derated to 1.0 Amp but is capable of 1.5Amps.
2. Unless otherwise specified, these specifications apply for post radiation and -55°C < Tc < +125°C.
3. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. 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. Test points and limits are shown on the Dropout Voltage curves,
see Figure 4.
5. Not tested. Shall be guaranteed by design, characterization, or correlation to other tested parameters.
SCD8662 Rev B 1/7/09
2
Aeroflex Plainview
60
50
40
Maximum Power
Dissipation
(Watts)
30
20
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 the regulator chip in the VRG8662. The graph
above represents the achievable power before the chip shuts down. The line in the graph represents the maximum power
dissipation of the VRG8662 This graph is based on the maximum junction temperature of 150°C and a thermal resistance (
Θ
JC
)
of 3°C/W.
See Note 1, pg 2.
See Note 1, pg 2.
FIGURE 3 – RH1086 SHORT CIRCUIT CURRENT
FIGURE 4 – RH1086 DROPOUT VOLTAGE CURVE
SCD8662 Rev B 1/7/09
3
Aeroflex Plainview
V
IN
2
VRG8662
1
Vout
R1
10µF
Tant
.
V
REF
3
ADJ
V
REF
= 1.25V, I
ADJ
= 50µA
+Reg = V
OUT
= V
REF
(1+R2/R1) + (I
ADJ
x R2)
R2
FIGURE 5 – BASIC RH1086 ADJUSTABLE REGULATOR APPLICATION
SCD8662 Rev B 1/7/09
4
Aeroflex Plainview
2
3
1
NOTE: Package & Lid are electrically isolated from signal pads.
FIGURE 6 – PACKAGE OUTLINE — SURFACE MOUNT
SCD8662 Rev B 1/7/09
5
Aeroflex Plainview
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