Standard Products
VRG8661
Adjustable Regulator
Negative Voltage
Radiation Tolerant
www.aeroflex.com/voltreg
April 16, 2012
FEATURES
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Manufactured using
Space Qualified RH137 die
Radiation performance
- Total dose: >100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
- ELDRS:
> 50 krads(Si), Dose rate =
0.01 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, .400"L x .296"W x .120"Ht
- Power package
- Weight - 2 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 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.
3
ADJ
2
V
OUT
RH137
Negative
Regulator
V
IN
1
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
SCD8661 Rev F
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Lead temperature (soldering 10 Sec)
Input-Output Voltage Differential
ESD
Operating Junction Temperature Range
Storage Temperature Range
RANGE
300
-30
2.000-3.999 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 2
NOTICE: Stresses above those listed under "Absolute Maximum Ratings" 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
Unless otherwise specified -55°C < T
C
< +125°C & (V
IN
-V
OUT
) = -5V, I
OUT
= 0.5A
PARAMETER
Reference Voltage 1/ 5/
Line Regulation 1/ 2/
Load Regulation 1/ 2/
ELECTRICAL PERFORMANCE CHARACTERISTICS
CONDITIONS (P
P
MAX
)
-3V < (V
IN
- V
OUT
) < V
DIFF MAX
, 10mA < I
OUT
< I
MAX
-3V < (V
IN
- V
OUT
) < -27V,
SYM
V
REF
MIN
-1.200
-
-
-
-
66
-
MAX
-1.300
0.05
50
1.0
0.02
-
100
5
5
3
-
-
1
3
UNITS
V
%/V
mV
%
%/W
dB
µA
µA
V
OUT
V
IN
V
OUT
10mA < I
OUT
< I
MAX
, V
OUT
< -5V
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
Thermal Regulation
Ripple Rejection
Adjustment Pin Current 1/
Adjustment Pin Current 1/
Change
Minimum Load Current 1/ 3/
I
ADJ
I
MIN
10mA < I
OUT
< I
MAX
-3V < (V
IN
- V
OUT
) < -27V
(V
IN
- V
OUT
) = -27V
(V
IN
- V
OUT
) < -10V
(V
IN
- V
OUT
) < -15V
(V
IN
- V
OUT
) = -27V, T
C
= +25°C
T
A
= +125°C
-
-
-
1.5
0.24
-
-
mA
Current Limit 1/ 4/
I
MAX
A
%
°C/W
Long Term Stability 3/
Thermal Resistance
(Junction to Case) 3/
V
OUT
T
IME
JC
Notes:
1/ Specification derated to reflect Total Dose exposure to 100 Krad (Si) @25°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.
4/ Pulsed @ <10% duty cycle @ 25°C.
5/ Testing over 12 watts is not performed over + 25°C.
SCD8661 Rev F 4/16/12
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)
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 (
JC
) of
3°C/W.
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
SCD8661 Rev F 4/16/12
3
Aeroflex Plainview
V
IN
V
REF
= 1.25V, I
ADJ
= 50µA
V
OUT
= -V
REF
(1+R2/R1) + (-I
ADJ
x R2)
1
VRG8661
2
V
OUT
R1
3
ADJ
R2
Adjustable Regulator
FIGURE 3 – TYPICAL APPLICATIONS
FIGURE 4 – TYPICAL CURRENT LIMIT
SCD8661 Rev F 4/16/12
4
Aeroflex Plainview
.301
MAX
.095
2 Places
R.025 MAX
6 Places
.030 MIN
.005
2
3
.120
2 Places
.405
MAX
.030
MIN
1
.225
4X R.020
.015
3 Places
.127
MAX
.150
.005
.286
.005
NOTES:
1. Package & Lid are electrically isolated from signal pads.
2. ESD symbol denotes Pin 1.
FIGURE 5– PACKAGE OUTLINE — SURFACE MOUNT
SCD8661 Rev F 4/16/12
5
Aeroflex Plainview
嵌入式系统
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