Standard Products
VRG8661
Adjustable Regulator
Negative Voltage
Radiation Tolerant
www.aeroflex.com/voltreg
January 7, 2009
FEATURES
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Manufactured using
Linear Technology Corporation
®
Space Qualified RH137 die
Radiation performance
- Total dose: 100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
Thermal shutdown
Output voltage adjustable: -1.25V to -27V
3-Terminal
Output current: 1.5A
Voltage reference: -1.25V ±4%
Load regulation: 1.0% max
Line regulation: 0.05% max
Ripple rejection: >66dB
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 5962-09206 pending
Note: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program.
DESCRIPTION
The Aeroflex Plainview VRG8661 consists of a Negative Adjustable (RH137) voltage regulator capable of supplying
1.5Amps over the output voltage range as defined under recommended operating conditions. The VRG8661 offers
excellent line and load regulation specifications and ripple rejection. Dropout (Vin - Vout) decreases at lower load
currents.
The VRG8661 serves a wide variety of applications including High Efficiency Linear Regulators, Post Regulators for
Switching Supplies, Constant Current Regulators, Battery Chargers and Microprocessor Supply.
The VRG8661 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 VRG8661 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 RH137, which is available on-line at
www.linear.com.
3
ADJ
2
V
OUT
RH137
Negative
Regulator
V
IN
1
SCD8661 Rev B
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Lead temperature (soldering 10 Sec)
Input-Output Voltage Differential
ESD
Operating Junction Temperature Range
Storage Temperature Range
RANGE
300
-30
1.999
1/
-55 to +150
-65 to +150
UNITS
°C
V
DC
KV
°C
°C
1/ Meets ESD testing per MIL-STD-883, method 3015, Class 1C.
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
Case Operating Temperature Range
RANGE
-1.25 to -27
-55 to +125
UNITS
V
DC
°C
ELECTRICAL PERFORMANCE CHARACTERISTICS 1/
PARAMETER
Reference Voltage
Line Regulation 2/
SYM
V
REF
CONDITIONS (P
≤
P
MAX
)
-3V < (V
IN
- V
OUT
) < V
DIFF MAX
, 10mA < I
OUT
< I
MAX
-3V < (V
IN
- V
OUT
) < -27V,
MIN
-1.200
-
-
-
-
66
-
10mA < I
OUT
< I
MAX
-3V < (V
IN
- V
OUT
) < -27V
I
MIN
(V
IN
- V
OUT
) = -27V
(V
IN
- V
OUT
) < -10V
Current Limit
I
MAX
(V
IN
- V
OUT
) < -15V
(V
IN
- V
OUT
) = -27V, T
C
= +25°C
Long Term Stability 3/
Thermal Resistance
(Junction to Case) 3/
-
-
-
-
1.5
0.24
-
-
MAX
-1.300
0.05
50
1.0
0.02
-
100
5
5
5
3
-
-
1
3
UNITS
V
%/V
mV
%
%/W
dB
µA
µA
Δ
V
OUT
Δ
V
IN
Load Regulation 2/
Thermal Regulation
Ripple Rejection
Adjustment Pin Current
Adjustment Pin Current
Change
Minimum Load Current 3/
Δ
V
OUT
10mA < I
OUT
< I
MAX
, V
OUT
< -5V
Δ
I
OUT
10mA < I
OUT
< I
MAX
, V
OUT
> -5V
I
OUT
= 1.5A, (V
IN
- V
OUT
) = -13.3V, 20ms Pulse, 20W,
T
C
= +25°C
V
OUT
= -10V, f = 120Hz, C
ADJ
= 10µF
I
ADJ
Δ
I
ADJ
mA
A
%
°C/W
Δ
V
OUT
Δ
T
IME
Θ
JC
T
A
= +125°C
Notes:
1. Unless otherwise specified, these specifications apply for post radiation, (Vin - Vout) = 5V, Iout = 0.5A and -55°C < Tc < +125°C.
2. Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specification for thermal regulation. Measurements taken at the output lead must be adjusted for lead
resistance.
3. Not tested. Shall be guaranteed to the specified limits.
SCD8661 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 VRG8661. The graph
above represents the achievable power before the chip shuts down. The line in the graph represents the maximum power
dissipation of the VRG8661 This graph is based on the maximum junction temperature of 150°C and a thermal resistance (
Θ
JC
)
of 3°C/W.
V
IN
1
VRG8661
2
V
OUT
R1
3
ADJ
V
REF
= 1.25V, I
ADJ
= 50µA
V
OUT
= -V
REF
(1+R2/R1) + (-I
ADJ
x R2)
R2
Adjustable Regulator
FIGURE 3 – TYPICAL APPLICATIONS
SCD8661 Rev B 1/7/09
3
Aeroflex Plainview
2
3
1
NOTE: Package & Lid are electrically isolated from signal pads.
FIGURE 4 – PACKAGE OUTLINE — SURFACE MOUNT
SCD8661 Rev B 1/7/09
4
Aeroflex Plainview
ORDERING INFORMATION
MODEL
VRG8661-S
VRG8661-7
VRG8661-201-1S
VRG8661-201-2S
DSCC SMD #
-
-
5962-0920602KXC
5962-0920602KXA
SCREENING
Military Temperature, -55°C to +125°C
Screened in accordance with MIL-PRF-38534, Class K.
Commercial Flow, +25°C testing only
In accordance with DSCC SMD
PACKAGE
SMD-0.5
Power Pkg
EXPORT CONTROL:
This product is controlled for export under the International Traffic in
Arms Regulations (ITAR). A license from the U.S. Department of
State is required prior to the export of this product from the United
States.
EXPORT WARNING:
Aeroflex’s military and space products are controlled for export under
the International Traffic in Arms Regulations (ITAR) and may not be
sold or proposed or offered for sale to certain countries. (See ITAR
126.1 for complete information.)
PLAINVIEW, NEW YORK
Toll Free: 800-THE-1553
Fax: 516-694-6715
SE AND MID-ATLANTIC
Tel: 321-951-4164
Fax: 321-951-4254
INTERNATIONAL
Tel: 805-778-9229
Fax: 805-778-1980
WEST COAST
Tel: 949-362-2260
Fax: 949-362-2266
NORTHEAST
Tel: 603-888-3975
Fax: 603-888-4585
CENTRAL
Tel: 719-594-8017
Fax: 719-594-8468
www.aeroflex.com
info-ams@aeroflex.com
Aeroflex Microelectronic Solutions reserves the right to
change at any time without notice the specifications, design,
function, or form of its products described herein. All
parameters must be validated for each customer's application
by engineering. No liability is assumed as a result of use of
this product. No patent licenses are implied.
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, performance-driven and customer-focused
and the Linear Technology logo are registered trademarks and RH137 are a copyright of Linear Technology Corporation.
SCD8661 Rev B 1/7/09
5
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