SCD8661 Rev B
❑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
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.
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
January 7, 2009
www.aeroflex.com/voltreg
Standard Products
FEATURES
1
V
IN
ADJ
V
OUT
3
2
RH137
Negative
Regulator
Radiation Tolerant
Standard Products
VRG8661
Adjustable Regulator
Negative
Voltage
Note: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program.
2
SCD8661 Rev B 1/7/09 Aeroflex Plainview
ABSOLUTE MAXIMUM RATINGS
PARAMETER RANGE UNITS
Lead temperature (soldering 10 Sec) 300 °C
Input-Output Voltage Differential -30 VDC
ESD 1.999 1/ KV
Operating Junction Temperature Range -55 to +150 °C
Storage Temperature Range -65 to +150 °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 RANGE UNITS
Output Voltage Range -1.25 to -27 VDC
Case Operating Temperature Range -55 to +125 °C
ELECTRICAL PERFORMANCE CHARACTERISTICS 1/
PARAMETER SYM CONDITIONS (P ≤PMAX)MIN MAX UNITS
Reference Voltage VREF -3V < (VIN - VOUT) < VDIFF MAX, 10mA < IOUT < IMAX -1.200 -1.300 V
Line Regulation 2/ -3V < (VIN - VOUT) < -27V, -0.05%/V
Load Regulation 2/10mA < IOUT < IMAX, VOUT < -5V
10mA < IOUT < IMAX, VOUT > -5V
-
-
50
1.0
mV
%
Thermal Regulation IOUT = 1.5A, (VIN - VOUT) = -13.3V, 20ms Pulse, 20W,
TC = +25°C -0.02%/W
Ripple Rejection V
OUT = -10V, f = 120Hz, CADJ = 10µF 66 - dB
Adjustment Pin Current IADJ - 100 µA
Adjustment Pin Current
Change
ΔIADJ 10mA < IOUT < IMAX -5
µA
-3V < (VIN - VOUT) < -27V - 5
Minimum Load Current 3/IMIN (VIN - VOUT) = -27V - 5 mA
(VIN - VOUT) < -10V - 3
Current Limit IMAX (VIN - VOUT) < -15V 1.5 - A
(VIN - VOUT) = -27V, TC = +25°C 0.24 -
Long Term Stability 3/TA = +125°C - 1 %
Thermal Resistance
(Junction to Case) 3/ΘJC -3°C/W
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.
ΔVOUT
ΔVIN
ΔVOUT
ΔIOUT
ΔVOUT
ΔTIME
3
SCD8661 Rev B 1/7/09 Aeroflex Plainview
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 (ΘJC)
of 3°C/W.
60
50
40
30
20
10
0 20406080100120140
Case Temperature (°C)
0
Maximum Power
Dissipation
(Watts)
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
VRG8661
VIN VOUT
ADJ
R1
R2
IADJ = 50µAVREF = 1.25V,
V
OUT = -VREF (1+R2/R1) + (-IADJ x R2)
12
3
Adjustable Regulator
FIGURE 3 – TYPICAL APPLICATIONS
4
SCD8661 Rev B 1/7/09 Aeroflex Plainview
FIGURE 4 – PACKAGE OUTLINE — SURFACE MOUNT
1
23
NOTE: Package & Lid are electrically isolated from signal pads.
5
SCD8661 Rev B 1/7/09
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 t he specifications, design,
function, or form of its products described herein. All
parameters must be validated for each customer's application
by engineering. No liab ility is assumed as a result of use of
this product. No patent licenses are implie d.
EXPORT CONTROL: EXPOR T WARNING:
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.
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.)
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, perform a nce -driven and cu stom e r-foc use d
and the Linear Technolo gy logo are registered trad em a rks and RH 137 are a co pyrigh t of Linear Te chn ology Corporation.
ORDERING INFORMATION
MODEL DSCC SMD # SCREENING PACKAGE
VRG8661-S - Military Temperature, -55°C to +125°C
Screened in accordance with MIL-PRF-38534, Class K.
SMD-0.5
Power Pkg
VRG8661-7 - Commercial Flow, +25°C testing only
VRG8661-201-1S
VRG8661-201-2S
5962-0920602KXC
5962-0920602KXA In accordance with DSCC SMD
