SCD8663 Rev E
❑Manufactured using Linear Technology Corporation ® Space Qualified RH1185 die
❑Radiation performance
- Total dose: 100 krads(Si), Dose rate = 50 - 300 rads(Si)/s
❑Thermal shutdown
❑Output voltage adjustable: -2.37 to -25V
❑Dropout voltage: 1.05V at 3.0Amps
❑5-Terminal
❑Output current: 3A
❑Voltage reference: -2.370V ±3%
❑Load regulation: 0.8% max
❑Line regulation: 0.02% max
❑Ripple rejection: >60dB
❑Packaging
- Hermetic Surface Mount Power Package
- 5 Pads, .301"W x .550"L x .130"Ht max
- Weight - 1.2 gm max
❑Designed for aerospace and high reliability space applications
❑Available on DSCC SMD 5962-09207
DESCRIPTION
The Aeroflex Plainview VRG8663 consists of a Negative Adjustable (RH1185) LDO voltage regulator capable of
supplying 3.0Amps over the output voltage range as defined under recommended operating conditions. The VRG8663
offers excellent line and load regulation specifications and ripple rejection. Drop out (VIN - VOUT) decreases at lower
load currents.
The VRG8663 serves a wide vari ety of applications including High Efficiency Linear Regulators, Post Regulators for
Switching Supplies, Constant Current Regul ators, Battery Chargers and Microprocessor Supply.
The VRG8663 has been specifically designed to meet exposure to radiation environments and is configured for a
SMD power package. It is guaranteed operational from -55°C to +125°C. Available screened to MIL-STD-883, the
VRG8663 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/LT1185, which is available on-line at
www.linear.com.
Radiation Tolerant
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
April 2, 2010
www.aeroflex.com/voltreg
Standard Products
FEATURES
VRG8663
Low Drop Out(LDO)Adjustable Regulator
Negative
Voltage
1
GND
V
OUT
RH1185
Feedback
VIN
2
3
4
5
Reference
Note: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program.
2
SCD8663 Rev E 4/2/10 Aeroflex Plainview
ABSOLUTE MAXIMUM RATINGS
PARAMETER RANGE UNITS
Input Voltage -35 VDC
Lead temperature (soldering 10 Sec) 300 C
Input Output Differential 30 VDC
Feedback & Reference Voltage -7 VDC
Output Voltage -30 VDC
ESD 2000 1/V
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 1.
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 -2.45 to -25 VDC
Input Output Differential 1 to 28 VDC
Case Operating Temperature Range -55 to +125 °C
ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, -55°C < Tc < +125°C.
PARAMETER SYM CONDITIONS (P PMAXMIN MAX UNITS
Reference Voltage
(At pin 6) 2/ 7/VREF 1mA < IOUT < 3A , VIN - VOUT = 1.2V to 28V, VOUT = -5V -2.29 -2.45 V
Dropout Voltage 2/ 4/VDROP IOUT = 0.5A, VOUT = -5V - 0.425 V
IOUT = 3A, VOUT = -5V -1.05V
Line Regulation 2/ 8/1.0V < VIN - VOUT < 20V, VOUT = -5V - 0.02 %/V
Load Regulation 2/ 8/5mA < IOUT < 3A, VIN - VOUT = 1.5V to 10V, VOUT = -5V - 0.8 %
Minimum Input Voltage 2/ 5/VIN MIN IOUT = 3A , VOUT = VREF - -4.50 V
Internal Current Limit
(See Figure 4) 2/ 11/ICL
1.5V < VIN - VOUT < 10V 3.3 4.55 A
VIN - VOUT = 15V 2.0 4 .5 A
VIN - VOUT = 20V 1.0 3 .1 A
VIN - VOUT = 28V /3 0.2 1 .6 A
External Current Limit 2/ILIM RLIM = 5K 10/ 2.7 3.7 A
RLIM = 15K 10/ 0.9 1.75 A
VOUT
VIN
VOUT
IOUT
See footnotes at top of next page.
3
SCD8663 Rev E 4/2/10 Aeroflex Plainview
Quiescent Supply Current 2/
6/IQIOUT = 5mA, VOUT = VREF, -4V < VIN < -25V - 3.5 mA
Supply Current Change with
Load 2/IQVIN – VOUT = VSAT 9/ - 35 mA/A
VIN – VOUT 2V -21mA/A
Ripple Rejection - IOUT = 1.0A, VIN - VOUT = 3V, f = 120Hz, 60 - dB
Thermal Regulation
(See application info LT1185)
3/-V
IN –VOUT = 10V, IOUT = 5mA to 2A, TC = +25°C - 0.014 %/W
Thermal Resistance
(Junction to Case) JC -3°C/W
Notes:
1/ Meets ESD testing per MIL-STD-883, method 3015, Class 2.
2/ Specifications derated to reflect Total Dose exposure to 100Krad (Si) @ +25°C.
3/ Not tested. Shall be guaranteed by design, characterization, or correla tion to other tested paramete rs.
4/ Dropout voltage is tested by reducing input voltage until the output drops 1% below its nominal value. Tests are done at 0.5A and 3A. The
power transistor looks basically like a pure resistance in this range so that minimum differential at any intermediate current can be calculated
by interpolation; VDROPOUT = 0.25V + (0.25 x IOUT). For load current less than 0.5A, see Figure 3.
5/ “Minimum input voltage” is limited by base emitter voltage drive of the power transistor section, not saturation as measured in Note 4. For
output voltages below 4V, “minimum input voltage” specification may limit dropout voltage before transistor saturation limitation.
6/ Supply current is measured on the ground pin, and does not include load current, RLIM, or output divider current.
7/ The 25W power level is guaranteed for an input-output voltage of 8.3V to 17V. At lower voltages the 3Amp limit applies, and at higher
voltages the internal power limiting may restrict regulator power below 25W.
8/ Line and load regulation are measured on a pulse basis with a pulse width of 2ms, to minimize heating. DC regulation will be affected by
thermal regulation and temperature coefficient of the reference.
9/VSAT is the maximum specified dropout voltage: 0.25V + (0.25 x IOUT).
10/ Current limit is programmed with a resistor from REF pin to GND pin. RLIM = 15K/ILIM.
11/ Pulsed @<10% duty cycle @25°C.
ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, -55°C < Tc < +125°C.
PARAMETER SYM CONDITIONS (P PMAXMIN MAX UNITS
4
SCD8663 Rev E 4/2/10 Aeroflex Plainview
The maximum Power dissipation is limited by the thermal shutdown function of the regulator chip in the VRG8663. The graph
above represents the achievable power before the chip shuts down. The line in the graph represents the maximum power
dissipation of the VRG8663 This graph is based on the maxi mum jun ctio n temperatu re of 150°C and a th erm al resistance (JC)
of 3°C/W.
60
50
40
30
20
10
0 20 40 60 80 100 120 140
Case Temperature (°C)
0
Maximum Power
Dissipation
(Watts)
FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE
FIGURE 3 – RH1185 DROPOUT VOLTAGE FIGURE 4 – RH1185 INTERNAL CURRENT LIMIT
TYPICAL CURVE
5
SCD8663 Rev E 4/2/10 Aeroflex Plainview
FIGURE 5 – BASIC VRG8663 ADJUSTABLE REGULATOR APPLICATION
R1 & R2 LOCATION & PROPER CONNECTION OF
POSITIVE SENSE LEAD
SETTING OUTPUT VOLTAGE
The RH1185 output voltage is set by two external resistors.
The internal reference voltage is trimmed to 2.37V so that
a standard 1% 2.37k resistor (R1) can be used to set
divider current at 1mA. R2 is then selected from:
for R1 = 2.37k and V
REF
= 2.37V, this reduces to:
suggested values of 1% resistors are shown below:
R2 = (VOUT - 2.37) R1
VREF
R2 = VOUT - 2.37
VOUT R2 when R1 = 2.37k
2.5V 130
3.3V 930
5V 2.67k
12V 9.76k
15V 12.7k
Parasitic
R2 GND
FB
VIN
VRG8663
(RH1185)
VOUT
*R1 should be connected directly to ground lead, not to the load, so
that r
a
= 0
. This limits the output voltage error to (I
GND
)(r
b
). Errors
created by r
a
are multiplied by (1 + R2/R1). Note that V
OUT
increases
with increasing ground pin current. R2 should be connected directly to
load for remote sensing. C1 = C2
2µF Tantalum.
VIN
C1
+
–5
Lead Resistance
Load
24
1
3
RLIM ra
R2
R1*
2.37k
- rb +
IGND
+
+C2
VOUT
+
–
6
SCD8663 Rev E 4/2/10 Aeroflex Plainview
FIGURE 6 – PACKAGE OUTLINE — SURFACE MOUNT
4X R.020
.550
MAX
.301
MAX
.127
MAX
.015
3 Places
.286
.005
.005
MIN
.030
.030
MIN
R.025 MAX
6 Places
.095
.030 MIN
.005
.005
4 Places
.120
.200
5
.150
32
41
4 Places
PAD 1
NOTE 1. Package & Lid are electrically isolated from signal pads.
7
SCD8663 Rev E 4/2/10
PLAINVIEW, NEW YORK
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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 liab ility is assumed as a result of use of
this product. No patent licenses are implied.
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 118 5 are a copyright of Linear Technology Corp ora tion.
ORDERING INFORMATION
MODEL DSCC SMD # SCREENING PACKAGE
VRG8663-S -Military Temperature, -55°C to +125°C
Screened in accordance with MIL-PRF-38534, Class K. SMD
Power Pkg
VRG8663-7 - Commercial Fl ow, +25°C testing only
VRG8663-201-1S
VRG8663-201-2S 5962-0920702KYC
5962-0920702KYA In accordance with DSCC SMD
