Standard Products
VRG8657/VRG8658
Low Drop Out(LDO)Adjustable Voltage Regulators
Dual Positive
Radiation Tolerant
www.aeroflex.com/RadHard
October 24, 2008
FEATURES
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Manufactured using
Linear Technology Corporation
®
Space Qualified RH1086 die
Radiation performance
- Total dose > 100 krad (Si)
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Packaging – Hermetic metal
- Thru-hole or Surface mount
Two-Independent voltage regulators
- 6 Leads, .42"L x .65"W x .200"Ht
Thermal shutdown
- Power package
Output voltage adjustable: 1.25V to 23V
- Weight - 5 gm max
Dropout voltage: 1.55V at 1.0Amps
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Designed for aerospace and high reliability space
3-Terminal
applications
Output current: 1.0A (See Note 1 Pg 2)
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DSCC SMD: 5962-09201 Pending
Voltage reference: 1.25V +2%, -3.2%
Load regulation: 0.4% max
Line regulation: 0.25% max
Ripple rejection: >60dB
DESCRIPTION
The Aeroflex Plainview VRG8657/8658 consists of two Positive Adjustable (RH1086) LDO voltage regulators each
capable of supplying 1.0Amps over the output voltage range as defined under recommended operating conditions. The
VRG8657/8658 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 VRG8657/8658 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 VRG8657/8658 has been specifically designed to meet exposure to radiation environments. The VRG8657 is
configured for a Thru-Hole 6 lead metal power package and the VRG8658 is configured for a Surface Mount 6 lead
metal power package. It is guaranteed operational from -55°C to +125°C. Available screened to MIL-STD-883, the
VRG8657/8658 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.
1
ADJ
2
V
OUT
RH1086
Positive
Regulator
V
IN
3
ADJ
V
OUT
RH1086
Positive
Regulator
V
IN
5
6
4
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
SCD8657 Rev D
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Lead temperature (soldering 10 Sec)
Input Output Differential
Output Voltage
ESD (MIL-STD-883, M3015, Class 3A)
Operating Junction Temperature Range
Storage Temperature Range
RANGE
25+V
REF
300
25
+25
>4000
-55 to +150
-65 to +150
UNITS
V
DC
°C
V
DC
V
DC
V
°C
°C
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
3/
RANGE
1.275 to 23
1.5 to 25
-55 to +125
5
UNITS
V
DC
V
DC
°C
°C/W
Case Operating Temperature Range
Thermal Resistance, Junction to case
θ
JC
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/
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 minimum, tested @ 25°C
SYM
V
REF
CONDITIONS (P
≤
P
MAX
)
1.5V < V
IN
- V
OUT
< 15V, 10mA < I
OUT
< 1.0A
MIN
1.210
-
-
-
-
-
1.0
0.047
-
60
-
-
MAX
1.275
0.25
0.4
1.55
120
5
-
-
10
-
0.04
0.3
UNITS
V
%
%
V
µA
µA
A
A
mA
dB
%/W
%
Δ
V
OUT
I
LOAD
= 10mA, 1.5V < V
IN
- V
OUT
< 15V
Δ
V
IN
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
Notes:
1. For Compliance with MIL-STD-883 Rev. 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 curve,
see Figure 4.
5. Not tested. Shall be guaranteed by design, characterization, or correlation to other tested parameters.
SCD8657 Rev D 10/24/08
Aeroflex Plainview
2
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 VG8657/8658. 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 VG8657/8658 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 VG8657/8658 will fall between the two lines. This graph is based on the maximum junction temperature of
150°C and a thermal resistance (
Θ
JC
) of 5°C/W.
See Note 1, pg 2.
See Note 1, pg 2.
FIGURE 3 – RH1086 SHORT CIRCUIT CURRENT
FIGURE 4 – RH1086 DROPOUT VOLTAGE CURVE
SCD8657 Rev D 10/24/08
3
Aeroflex Plainview
V
IN
10µF
Tant
.
VRG8657/58
V
REF
ADJ
R1
Vout
10µF
Tant
.
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
SCD8657 Rev D 10/24/08
4
Aeroflex Plainview
TABLE I – PIN NUMBERS vs FUNCTION
PIN
1
2
3
4
5
6
FUNCTION
POS_ADJ_1
POS_VOUT_1
POS_VIN_1
POS_ADJ_2
POS_VIN_2
POS_VOUT_2
.200
.100
.108
.123
ø
.010
CBA
ø
.145 THRU
2x .028
MAX.
M
.150 REF.
6
5
4
2° MAX. TYP.
.415
.2075
–C–
R.065 TYP.
4 PLCS
1
2
3
.720 ±.020
MEASURED
LEAD TIP
ESD/PIN 1
IDENT
.230 MIN
.415 SQ
.655
–B–
.122
±.003
.220 MAX.
±.005
–A–
ø
.010
BCA
.040
.030 DIA.
±.002
ø
.010
M
CBA
Notes:
1. Dimension Tolerance: ±.005 inches
2. Package contains BeO substrate
3. Case electrically isolated
FIGURE 6 – PACKAGE OUTLINE — THRU-HOLE POWER PACKAGE
SCD8657 Rev D 10/24/08
5
Aeroflex Plainview
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