VRG8651

Voltage Regulator
VRG8651/52
Dual LDO Adjustable Positive/Negative Voltage Regulators
Released Datasheet
Cobham.com/HiRel
March 24, 2016
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FEATURES
 Manufactured using
Space Qualified RH1086 and RH1185 die
 Packaging – Hermetic metal
 Radiation performance
– Thru-hole or Surface mount
- Total dose > 100 krad(Si),
– 8 Leads, .755"L x .415"W x .200"Ht
Dose rate = 50-300 rad(Si)/s
– Power package
 Two-Independent voltage regulators
– Weight - 6 gm max
 Thermal shutdown

Designed
for aerospace and high reliability space
 Adjustable Output Voltages
applications
 Negative regulator features (RH1185)
– Output voltage adjustable: -2.37 to -25V
– Dropout voltage: 1.05V at 3Amps
– 5-Terminal
– Output current: 3A
– Voltage reference: -2.370V ±3%
– Load regulation: 0.8% max
– Line regulation: 0.02% max
– Ripple rejection: >60dB
 Positive regulator features (RH1086)
– Output voltage adjustable: 1.25V to 23V
– Dropout voltage: 1.3V at 1.0 Amps
– 3-Terminal
– Output current: 1.0A, See note 13
– Voltage reference: 1.25V +2%, -3.2%
– Load regulation: 0.3% max
– Line regulation: 0.25% max
– Ripple rejection: >60dB
 Radiation Hardness Assurance Plan: DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The VRG8651/8652 consists of one Positive Adjustable (RH1086) and one Negative Adjustable (RH1185) LDO
voltage regulator capable of supplying 1.0Amps (RH1086) / 3Amps (RH1185) respectively over the output voltage
range as defined under recommended operating conditions. The VRG8651/8652 offers excellent line and load
regulation specifications and ripple rejection. There is full electrical isolation between the regulators and each
regulator to the package.
The VRG8651/8652 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 VRG8651/8652 has been specifically designed to meet exposure to radiation environments. The VRG8651 is
configured for a Thru-Hole 8 lead metal power package and the VRG8652 is configured for a Surface Mount 8 lead
metal power package. It is guaranteed operational from -55°C to +125°C. Available screened to MIL-STD-883, the
VRG8651/8652 is ideal for demanding military and space applications.
Dropout (VIN - VOUT) decreases at lower load currents for both regulators.
1
3
VOUT
ADJ
RH1086
7
8
VIN
4
Reference
2
Feedback
6
RH1185
VOUT
VIN
GND
Positive
Regulator
Negative
Regulator
5
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
SCD8651
Rev L
1
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ABSOLUTE MAXIMUM RATINGS
RANGE
PARAMETER
Input Voltage
RH1086
RH1185
25+ VREF
-35
Lead temperature (soldering 10 Sec)
UNITS
VDC
300
Input Output Differential
°C
25
30
VDC
-
-7
VDC
Output Voltage
+25
-30
VDC
DC Output Current
1.5
-
A
Feedback & Reference Voltage
2000 1/
V
Operating Junction Temperature Range
ESD
-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
RANGE
PARAMETER
Output Voltage Range
Input Output Differential
UNITS
RH1086
RH1185
1.275 to 23
-2.45 to -25
VDC
1.5 to 25
1 to 28
VDC
Case Operating Temperature Range
Thermal Resistance, Junction to case jc
-55 to +125
°C
5
°C/W
ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, these specifications apply for post radiation and -55°C < Tc < +125°C.
PARAMETER
SYM
CONDITIONS (P PMAX)
MIN
MAX
UNITS
1.210
1.275
V
RH1086 Positive LDO section only
Reference Voltage 2/ 3/
VREF
1.5V < VIN - VOUT < 15V, ILOAD = 10mA
Line Regulation 2/ 3/
VOUT ILOAD = 10mA, 1.5V < VIN - VOUT < 15V
VIN
-
0.25
%
Load Regulation 2/ 3/
VOUT 10mA < IOUT < 1.0A, VIN - VOUT = 3V
IOUT
-
0.3
%
Dropout Voltage 2/ 4/
VDROP VREF = 1%, IOUT = 1.0A
-
1.30
V
-
120
µA
-
5
µA
Adjust Pin Current 2/
-
Adjust Pin Current Change
2/
-
Current Limit 2/ 14/
Minimum Load Current
5/
Ripple Rejection 3/
10 mA < IOUT < 1.0A, 1.5V < VIN - VOUT < 15V
IMAX
VIN - VOUT = 5V
VIN - VOUT < 25V
1.5
0.047
-
A
A
IMIN
VIN - VOUT = 25V
-
10
mA
60
-
dB
-
IOUT = 1.0A, VIN - VOUT = 3V, f = 120Hz,
CADJ = COUT = 25µF
Thermal Regulation
30ms pulse, TC = +25°C
-
0.04
%/W
VREF Long-Term Stability 5/
Burn In: TC = +125°C @ 1000hrs min, tested @ 25°C
-
0.3
%
SCD8651
Rev L 3/24/2016
2
Cobham Semiconductor Solutions
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ELECTRICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, these specifications apply for post radiation and -55°C < Tc < +125°C.
PARAMETER
CONDITIONS (P PMAX)
SYM
MIN
MAX
UNITS
1mA < IOUT < 3A, VIN - VOUT = 1.2V to 28V, VOUT = -5V -2.29
-2.45
V
IOUT = 0.5A, VOUT = -5V
-
0.425
V
IOUT = 3A, VOUT = -5V
-
1.05
V
RH1185 Negative LDO section only 1/, 9/
Reference Voltage
(At pin 6) 2/ 9/
VREF
Dropout Voltage 2/ 6/
VDROP
Line Regulation 2/ 10/
VOUT 1.0V < VIN - VOUT < 20V, VOUT = -5V
VIN
-
0.02
%/V
Load Regulation 2/ 10/
VOUT 5mA < IOUT < 3A, VIN - VOUT = 1.5V to 10V, VOUT = -5V
IOUT
-
0.8
%
-
-4.50
V
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 = 30V 5/
0.2
1.6
A
RLIM = 5K 12/
2.7
3.7
A
RLIM = 15K 12/
0.9
1.6
A
IOUT = 5mA, VOUT = VREF, -4V < VIN < -25V
-
3.5
mA
VIN – VOUT = VSAT
-
35
mA/A
-
21
mA/A
60
-
dB
-
0.014
%/W
Minimum Input Voltage 2/ 7/ VIN MIN IOUT = 3A , VOUT = VREF
Internal Current Limit (See
Graph for Guaranteed Curve
- See Figure 6) 2/ 14/
External Current Limit 2/
Quiescent Supply Current 2/
8/
Supply Current
Change with Load 2/
ICL
ILIM
IQ
IQ
11/
VIN – VOUT  2V
Ripple Rejection
-
IOUT = 1.0A, VIN - VOUT = 3V, f = 120Hz,
Thermal Regulation (See
application information
LT1185) 5/
-
VIN – VOUT = 10V, IOUT = 5mA to 2A, TC = +25°C
Notes
1. Meets ESD testing per MIL-STD-883, method 3015, Class 2.
2. Specification derated to reflect High Dose Rate (1019 condition A) to 100 krad(Si) @ +25°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.
5. Not tested. Shall be guaranteed by design, characterization, or correlation to other tested parameters.
6. 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 4.
7. “Minimum input voltage” is limited by base emitter voltage drive of the power transistor section, not saturation as measured in
Note 6. For output voltages below 4V, “minimum input voltage” specification may limit dropout voltage before transistor
saturation limitation.
8. Supply current is measured on the ground pin, and does not include load current, RLIM, or output divider current.
9. The 25W power level is guaranteed for an input-output voltage of 8.3V to 17V. At lower voltages the 3A limit applies, and at
higher voltages the internal power limiting may restrict regulator power below 25W.
10. 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.
11. VSAT is the maximum specified dropout voltage; 0.25V +(0.25 x IOUT).
12. Current limit is programmed with a resistor from REF pin to GND pin. RLIM = 15K/ILIM.
13. For compliance with MIL-STD- 883 revision C current density specification, the RH1086MK is derated to 1 Amp but is capable
of 1.5 Amps.
14. Pulsed @ <10% duty cycle @ +25°C.
SCD8651
Rev L 3/24/2016
3
Cobham Semiconductor Solutions
www.cobham.com/HiRel
60
50
40
Maximum Power
Dissipation
(Watts)
30
Both Regulators
20
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
VRG8651/8652. 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 VRG8651/8652 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 VRG8651/8652 will fall between the two
lines. This graph is based on the maximum junction temperature of 150°C and a thermal resistance (JC) of 5°C/W.
SCD8651
Rev L 3/24/2016
4
Cobham Semiconductor Solutions
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FIGURE 3 – RH1086 DROPOUT VOLTAGE
TYPICAL CURVE
FIGURE 4 – RH1185 DROPOUT VOLTAGE
TYPICAL CURVE
FIGURE 5 – RH1086 SHORT CIRCUIT CURRENT
FIGURE 6 – RH1185 INTERNAL CURRENT LIMIT
SCD8651
Rev L 3/24/2016
5
Cobham Semiconductor Solutions
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VIN
8
10µF
Tant.
VRG8651/52 7
(RH1086)
VREF
1
VREF = 1.25V, IADJ = 50µA
Vout
10µF
Tant.
R1
ADJ
+Reg = VOUT = VREF (1+R2/R1) + (IADJ x R2)
R2
FIGURE 7 – BASIC RH1086 ADJUSTABLE REGULATOR APPLICATION
+
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:
(VOUT - 2.37) R1
R2 =
VREF
for R1 = 2.37k and VREF = 2.37V, this reduces to:
+
–
R2 = VOUT - 2.37
R2 when R1 = 2.37k
2.5V
3.3V
5V
12V
15V
130
930
2.67k
9.76k
12.7k
5
ra
RLIM
+
2
4
R2
GND
1
FB
VIN
- rb +
IGND
C2
R1*
2.37k
Load
VOUT
R2
VRG8651/52
(RH1185)
VOUT
suggested values of 1% resistors are shown below:
VOUT
C1
VIN
+
Parasitic
Lead Resistance
3
–
*R1 should be connected directly to ground lead, not to the load, so
that ra = 0 . This limits the output voltage error to (IGND)(rb). Errors
created by ra are multiplied by (1 + R2/R1). Note that VOUT increases
with increasing ground pin current. R2 should be connected directly to
load for remote sensing. C1 = C2 2µF Tantalum.
SETTING OUTPUT VOLTAGE
R1 & R2 LOCATION & PROPER CONNECTION OF
POSITIVE SENSE LEAD
FIGURE 8 – BASIC RH1185 ADJUSTABLE REGULATOR APPLICATION
SCD8651
Rev L 3/24/2016
6
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TABLE I – PIN NUMBERS vs FUNCTION
PIN
FUNCTION
1
POS_ADJ_1
2
NEG_REF_2
3
NEG_VOUT_2
4
NEG_VIN_2
5
NEG_GND_2
6
NEG_FB_2
7
POS_VOUT_1
8
POS_VIN_1
.300
.090
8X
.100
.108
ø .010
M
CBA
.150 REF.
ø.145 THRU
2x .028
MAX.
7
8
6
2° MAX.
5
.720 ±.020
MEASURED AT
LEAD LENGTH OF .230"
.415
.2075
–C–
2
1
3
4
ESD/PIN 1
IDENT
.230 MIN
.515
R.065 TYP.
4 PLCS
.632
.755
±.003
.122
–B–
ø .010
BCA
.220 MAX.
±.005
–A–
.040
.030 DIA.
±.002
Notes:
1. Dimension Tolerance: ±.005 inches
2. Package contains BeO substrate
3. Case electrically isolated
ø .010
M
CBA
FIGURE 9 – PACKAGE OUTLINE — THRU-HOLE POWER PACKAGE
SCD8651
Rev L 3/24/2016
7
Cobham Semiconductor Solutions
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TABLE II – PIN NUMBERS vs FUNCTION
PIN
FUNCTION
1
POS_ADJ_1
2
NEG_REF_2
3
NEG_VOUT_2
4
NEG_VIN_2
5
NEG_GND_2
6
NEG_FB_2
7
POS_VOUT_1
8
POS_VIN_1
.300
.090
8X
.100
.108
ø .010
CBA
ø.145 THRU
2x .028
MAX.
.150 REF.
M
7
8
6
.060 ±.005
5
.415
.886 ±.020
.2075
–C–
R.065 TYP.
4 PLCS
2
1
3
4
ESD/PIN 1
IDENT
.515
.632
.755
±.003
.122
–B–
ø .010
BCA
.220 MAX.
±.005
–A–
.020±.005
.030 DIA.
±.002
ø .010
M
CBA
.040
Notes:
1. Dimension Tolerance: ±.005 inches
2. Package contains BeO substrate
3. Case electrically isolated
FIGURE 10 – PACKAGE OUTLINE — SURFACE MOUNT POWER PACKAGE
SCD8651
Rev L 3/24/2016
8
Cobham Semiconductor Solutions
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ORDERING INFORMATION
MODEL
DLA SMD #
SCREENING
PACKAGE
VRG8651 - 7
-
Commercial Flow, +25°C testing only
VRG8651 - S
-
Military Temperature, -55°C to +125°C
Screened in accordance with the individual Test Methods
of MIL-STD-883 for Space Applications
VRG8651- 201-1S
5962-0920101KUC
VRG8651- 201-2S
5962-0920101KUA
VRG8651- 901-1S
5962R0920101KUC
VRG8651- 901-2S
5962R0920101KUA
In accordance with DLA Certified RHA Program Plan to RHA
Level "R", 100 krad(Si)
VRG8652 - 7
-
Commercial Flow, +25°C testing only
VRG8652 - S
-
Military Temperature, -55°C to +125°C
Screened in accordance with the individual Test Methods
of MIL-STD-883 for Space Applications
VRG8652- 201-1S
5962-0920101KZC
VRG8652- 201-2S
5962-0920101KZA
VRG8652- 901-1S
5962R0920101KZC
VRG8652- 901-2S
5962R0920101KZA
SCD8651
Rev L 3/24/2016
In accordance with DLA SMD
In accordance with DLA SMD
8 Lead
Thru-Hole
Power Pkg
8 Lead
Surface Mount
Power Pkg
In accordance with DLA Certified RHA Program Plan to RHA
Level "R", 100 krad(Si)
9
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REVISION HISTORY
Date
Revision
03/24/2016
L
SCD8651
Rev L 3/24/2016
Change Description
Import into Cobham format
10
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Datasheet Definition
Advanced Datasheet - Product In Development
Preliminary Datasheet - Shipping Prototype
Datasheet - Shipping QML & Reduced Hi-Rel
For detailed performance characteristic curves, applications information and typical applications, see the latest
datasheets for their RH1086 & RH1185, which are available on-line at www.linear.com.
LT, LTC, Linear Technology and the Linear logo are registered trademarks and RH1086 & RH1185 are copyright Linear Technology Corporation.
EXPORT CONTROL:
This product is controlled for export under the Export Administration Regulations (EAR), 15 CFR Parts 730-774.
A license from the Department of Commerce may be required prior to the export of this product from the United States.
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E: [email protected]
T: 800 645 8862
Aeroflex Plainview Inc., DBA Cobham Semiconductor Solutions, reserves the right to make changes to any products and services described herein
at any time without notice. Consult Aeroflex or an authorized sales representative to verify that the information in this data sheet is current before
using this product. Aeroflex does not assume any responsibility or liability arising out of the application or use of any product or service described
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SCD8651
Rev L 3/24/2016
11
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