VRG8691

Voltage Regulator
VRG8691/92
7.5 Amp LDO Adjustable Positive Voltage Regulators
Released Datasheet
Cobham.com/HiRel
March 24, 2016
The most important thing we build is trust
FEATURES
 Radiation performance







Enable Input - TTL / CMOS Compatible
Slow Start capability
Stable with multiple ceramic output capacitors
Packaging – Hermetic metal
- Thru-hole or Surface mount
- 12 Leads, 0.900"L x 1.000"W x .205"Ht
- Power package
- Weight - 18 gm max
 Designed for aerospace and high reliability
space applications




- Total dose: 100 krad(Si),
Dose rate = 50-300 rad(Si)/s
Output voltage adjustable: 1.0V to 3.3V
Output current: 7.5A
Dropout voltage: 0.5V at 7.5Amps
Voltage reference: 1.0V ±0.5%
Load regulation: 0.5% max
Line regulation: 0.2% max
Ripple rejection: >80dB
 Radiation Hardness Assurance Plan: DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The VRG8691/92 is capable of supplying in excess of 7.5Amps over the output voltage range as defined
under recommended operating conditions. The regulator is exceptionally easy to set-up, requiring only 2
external resistors to set the output voltage. The module design has been optimized for excellent regulation
and low drop-out voltage. Figures 2 through 5 illustrate setting output voltage, setting current limits and
choosing a slow start capacitor. The VRG8691/92 serves a wide variety of applications including local
on-card regulation, programmable output voltage regulation or precision current regulation.
The VRG8691/92 has been specifically designed to meet exposure to radiation environments. The
VRG8691 is configured for a Thru-Hole 12 lead metal power package and the VRG8692 is configured for
a Surface Mount 12 lead metal power package. It is guaranteed operational from -55°C to +125°C.
Available screened to MIL-STD-883, the VRG8691/92 is ideal for demanding military and space
applications.
CURRENT LIMIT (ICL)
The VRG8691/92 features internal current limiting making them virtually blowout-proof against overloads.
The limit is nominally 11.5A @ Vin = 5V (see Table 2), but may be increased or decreased with the addition
of one external resistor (see Application Note 2).
VIN
1
12
2
11
3
10
VBIAS
4
ENABLE
GND
VRG8691/92
VOUT
9
VSENSE
5
8
Current Limit
6
7
Slow Start
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
SCD8691
Rev J
1
Cobham Semiconductor Solutions
www.cobham.com/HiRel
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RANGE
UNITS
-55 to +150
°C
300
°C
-65 to +150
°C
VBIAS, VIN
7
V
Thermal Resistance (Junction to case JC)
1
°C/W
25 1/
W
Operating (Junction) Temperature Range
Lead Temperature (soldering, 10 sec)
Storage Temperature Range
Power
1/ Based on pass transistor limitations of (VIN - VO) x IO and JC < 1°C/W with 25°C max TJ rise and TC = +125°C.
NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
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
1.0 to 3.3
-55 to +125
VDC
°C
0 to 7.5
A
VBIAS
3.3 to 5.5 1/
VDC
VIN
1.8 to 5.5 2/
VDC
Output Voltage Range
Case Operating Temperature Range
Output Current
1/ VBIAS must maintain a level equal or above VIN but not fall below 3.3V
2/ Depending upon VOUT setting.
ELECTRICAL PERFORMANCE CHARACTERISTICS 1/
PARAMETER
SYM
Reference Voltage
VREF
VIN = VBIAS = 5V, ENABLE = 0, 0A < IOUT < 7.5A
Line Regulation
VOUT
VIN
2V < VIN < 3V, VOUT = 1.0V, CIN > 47µF,
Load Regulation
VOUT
IOUT
4.3V < VIN < 5.3V, VOUT = 3.3V, COUT > 47µF,
0A < IOUT < 7.5A, CIN > 47µF, COUT > 47µF,
f = 120Hz, CLOAD = 47µF,
VIN + VRIP > VOUT + VDROP(MAX) @ 5A,
VIN = 4.3V, VRIP = 1VP-P, VOUT = 3.3V
Ripple Rejection Ratio
Dropout Voltage
CONDITIONS
VDROP
@VOUT = 1%, 0A < IOUT < 7.5A
MIN
MAX
UNITS
0.985
1.015
V
-
0.2
%/V
-
0.5
%
80
-
dB
-
0.5
V
-
100
pA
Adjustment Pin Current
IADJ
Minimum Load Current
IMIN
-
0
mA
Current Limit 2/
ICL
9.5
13.5
A
Long Term Stability 3/
VOUT
TIME
-
1
%
Supply Current (VBIAS)
IBIAS
-
15
mA
Notes:
1/ Unless otherwise specified, these specifications apply for post radiation: VBIAS = VIN = 5V, VOUT = 3.3V, IOUT = 7.5A and -55°C < Tc <+125°C, Min
Input/Output capacity of 47µF Tant with 1µF ceramic in parallel.
2/ Current Limit is adjustable as shown in Application Note 2, Figures 3 and 4.
3/ Not tested. Shall be guaranteed to the specified limits after 1000hr life test.
SCD8691
Rev J 3/24/2016
2
Cobham Semiconductor Solutions
www.cobham.com/HiRel
APPLICATION NOTE 1
BASIC SET-UP
Setting the output voltage (VOUT):
4
VBIAS
VBIAS
0.1µF
VRG8691/92
1
VIN
2
1µF
CER
+ 47µF
10
VIN
VOUT
3
12
TANT
CURR. LIMIT
8
ENABLE 1/
5
VOUT
11
CURR. LIMIT
SLOW START
1µF
7
R1
0.1µF
ENABLE
GND
CER
+
CLOAD
47µF
TANT
VSENSE
6
9
IADJ
VREF (=1V)
R2
To set the output voltage for a particular Vout:
- Choose an R2 value. (Recommended value = 1k
- Then use the following formula to determine the value of R1.
R1 = R2 x
VOUT - VREF
(R2 x IADJ) + VREF
, where VREF = 1v, IADJ typ = 10pA
Table 1 shows example values for R1 and R2 to achieve some standard voltages.
Table 2 shows the nominal current limit settings if the ’CURR. LIMIT’ function (pin 8) is left open.
Table 2
2/
Table 1
Example R1 & R2 for typical VOUT
VOUT
R2
R1
VIN
ICL NOM
3.3V
1k
2.3k
5V
11.5A
2.5V
1k
1.5k
3.3V
7.5A
1.8V
1k
800
2.5V
5.7A
1.0V
1k
0
1.8V
4.1A
Notes:
1/ ENABLE should be asserted after both VIN and VBIAS are applied.
(See Application Note 3, Figure 5 for the configuration where a separate ENABLE control line is NOT required).
2/ ICL varies directly with VIN.
(See Application Note 2 for adjusting the Current Limit, ICL).
FIGURE 2 –SETTING OUTPUT VOLTAGE
SCD8691
Rev J 3/24/2016
3
Cobham Semiconductor Solutions
www.cobham.com/HiRel
APPLICATION NOTE 2
SETTING THE CURRENT LIMIT
To Increase the Current Limit (ICL):
4
VBIAS
VBIAS
0.1µF
VRG8691/92
1
VIN
2
1µF
CER
+ 47µF
VOUT
VOUT
11
12
TANT
8
R INC
VIN
3
5
ENABLE
10
ENABLE
SLOW START
1µF
7
0.1µF
CURR. LIMIT
GND
R1
+
CER
CLOAD
47µF
TANT
VSENSE
6
9
IADJ
VREF (=1V)
R2
- If the ’CURR. LIMIT’ function (pin 8) is left open, the ICL decreases from 11.5 A(NOM) as VIN is decreased from 5V (Table 3).
Table 3
VIN
RINC
ICL NOM
5V
Open
11.5 A
3.3V
Open
7.5 A
2.5V
Open
5.7 A
1.8V
Open
4.1 A
- To increase the current limit above the nominal setting for any VIN and ICL combination, use the following formula:
RINC(K-OHMS) =
(
30 x VIN
30 x ICL - VIN
69
)
- To maintain ICL at the 11.5 A setting, for commonly found VIN voltages, apply RINC value found in Table 4.
Table 4
VIN
RINC
ICL NOM
5V
Open
11.5 A
3.3V
56k
11.5 A
2.5V
30k
11.5 A
1.8V
16k
11.5 A
FIGURE 3 – INCREASING THE CURRENT LIMIT (ICL)
SCD8691
Rev J 3/24/2016
4
Cobham Semiconductor Solutions
www.cobham.com/HiRel
APPLICATION NOTE 2 (CONTINUED)
SETTING THE CURRENT LIMIT
To Decrease the Current Limit (ICL):
4
VBIAS
VBIAS
0.1µF
VIN
R DEC
CURR. LIMIT
ENABLE
VRG8691/92
1
1µF + 47µF
CER
2
10
VIN
VOUT
3
12
TANT
8
5
VOUT
11
CURR. LIMIT
SLOW START
1µF
7
0.1µF
ENABLE
GND
R1
CER
+
CLOAD
47µF
TANT
VSENSE
6
9
IADJ
VREF (=1V)
R2
- As shown in Table 3, if the ’CURR. LIMIT’ function (pin 8) is left open, the ICL decreases from 11.5 A(NOM) as VIN is
decreased from 5V.
- To achieve any ICL, less than nominal, use RDEC which can be calculated using the following formula:
RDEC(K-OHMS) =
(
31 x VIN
69 x VIN - ICL
30
)
FIGURE 4 – DECREASING THE CURRENT LIMIT (ICL)
SCD8691
Rev J 3/24/2016
5
Cobham Semiconductor Solutions
www.cobham.com/HiRel
APPLICATION NOTE 3
START UP SEQUENCE
Recommended Power Supply Sequencing Options:
- OPTION 1: Controlling the ENABLE line with a Digital signal (TTL / CMOS compatible).
- Prior to applying power, disable the regulator by setting the ENABLE control line to a HIGH state.
- Apply VIN and VBIAS. 1/
- Wait until both VIN and VBIAS supplies have reached their operating levels.
- Toggle the ENABLE control line to a LOW state to turn on VOUT of the regulator.
- OPTION 2: Controlling the ENABLE line using the CDELAY feature.
- Connect a CDELAY capacitor between VBIAS and the ENABLE as shown in Figure 5 below. 2/
- Apply VIN and VBIAS. 1/
- CDELAY causes the regulator to self-enable after VBIAS has reached operating level.
NOTE: The ENABLE should always be asserted AFTER VIN and VBIAS have reached operating level.
4
VBIAS
VBIAS
0.1µF
CDELAY
VRG8691/92
1
VIN
2/
2
+
1/
1µF + 47µF
CER
10
VIN
VOUT
3
12
TANT
8
5
VOUT
11
CURR. LIMIT
SLOW START
1µF
7
0.1µF
ENABLE
GND
R1 CER
+
CLOAD
47µF
TANT
VSENSE
6
9
IADJ
VREF (=1V)
R2
NOTES:
1/ VIN should be applied before VBIAS if the Slow Start feature is used.
2/ CDELAY capacitor of 10uF is adequate for VBIAS rise times of up to 50ms.
FIGURE 5 – DELAYED ENABLE
SCD8691
Rev J 3/24/2016
6
Cobham Semiconductor Solutions
www.cobham.com/HiRel
APPLICATION NOTE 4
VOUT START UP RISE TIME CONTROL
Utilizing the Slow Start option:
When the VRG8691/92 is first powered up, using the Slow Start function controls the rate at which VOUT rises to the
required voltage set by R1 and R2.
Note: VIN should be applied before VBIAS when the Slow Start feature is used.
4
VBIAS
VBIAS
0.1µF
1µF + 47µF
CER
2
10
VIN
VOUT
12
TANT
5
0
VOUT
11
3
8
ENABLE
VRG8691/92
1
VIN
CURR. LIMIT
SLOW START
1µF
7
0.1µF
R1
ENABLE
+
GND
VSENSE
6
CER
+
CLOAD
47µF
TANT
CSS
9
IADJ
VREF (=1V)
R2
If it is desirable to control the output rise time, a capacitor (CSS) can be asserted on the Slow Start pin to adjust the rise
time for the following:
A. Large load capacitance will cause high surge currents which will trip the current limit circuitry.
The use of CSS will allow the output voltage to rise slowly thus mitigate the surge current phenomenon.
VOUT NOM
CSS >
ICL - ILOAD NOM
CLOAD
X (0.4 X
0.0014)
B. CSS may be used solely to control VOUT RISE TIME (Tr), when CLOAD is not an issue.
TR =
( C0.00142.5 )
SS X
Note: CSS in Farads and TR in seconds.
C. CSS is effective only when VIN is applied prior to VBIAS or ENABLE.
FIGURE 6 – SLOW START
SCD8691
Rev J 3/24/2016
7
Cobham Semiconductor Solutions
www.cobham.com/HiRel
PIN NUMBERS vs FUNCTION
PIN
FUNCTION
PIN
FUNCTION
1
VIN
7
Slow Start
2
VIN
8
Current Limit
3
VIN
9
VSENSE
4
VBIAS
10
VOUT
5
ENABLE
11
VOUT
6
GROUND
12
VOUT
Notes:
1. Dimension Tolerance: ±.005 inches
2. Package contains BeO substrate
3. Case electrically isolated
FIGURE 7– PACKAGE OUTLINE — VRG8691 THRU-HOLE POWER PACKAGE
SCD8691
Rev J 3/24/2016
8
Cobham Semiconductor Solutions
www.cobham.com/HiRel
PIN NUMBERS vs FUNCTION
PIN
FUNCTION
PIN
FUNCTION
1
VIN
7
Slow Start
2
VIN
8
Current Limit
3
VIN
9
VSENSE
4
VBIAS
10
VOUT
5
ENABLE
11
VOUT
6
GROUND
12
VOUT
Notes:
1. Dimension Tolerance: ±.005 inches
2. Package contains BeO substrate
3. Case electrically isolated
FIGURE 8– PACKAGE OUTLINE — VRG8692 SURFACE MOUNT POWER PACKAGE
SCD8691
Rev J 3/24/2016
9
Cobham Semiconductor Solutions
www.cobham.com/HiRel
ORDERING INFORMATION
MODEL
DLA SMD #
SCREENING
PACKAGE
VRG8691 - 7
-
Commercial Flow, +25°C testing only
VRG8691 - S
-
Military Temperature, -55°C to +125°C
Screened in accordance with the individual Test Methods
of MIL-STD-883 for Space Applications
VRG8691- 201-1S
5962-0923701KXC
VRG8691- 201-2S
5962-0923701KXA
VRG8691- 901-1S
5962R0923701KXC
VRG8691- 901-2S
5962R0923701KXA
In accordance with DLA Certified RHA Program Plan to RHA
Level "R", 100 krad(Si)
VRG8692 - 7
-
Commercial Flow, +25°C testing only
VRG8692 - S
-
Military Temperature, -55°C to +125°C
Screened in accordance with the individual Test Methods
of MIL-STD-883 for Space Applications
VRG8692- 201-1S
5962-0923701KYC
VRG8692- 201-2S
5962-0923701KYA
VRG8692- 901-1S
5962R0923701KYC
VRG8692- 901-2S
5962R0923701KYA
SCD8691
Rev J 3/24/2016
In accordance with DLA SMD
In accordance with DLA SMD
12 Lead
Thru-Hole
Power Pkg
12 Lead
Surface Mount
Power Pkg
In accordance with DLA Certified RHA Program Plan to RHA
Level "R", 100 krad(Si)
10
Cobham Semiconductor Solutions
www.cobham.com/HiRel
REVISION HISTORY
Date
Revision
03/24/2016
J
SCD8691
Rev J 3/24/2016
Change Description
Import into Cobham format
11
Cobham Semiconductor Solutions
www.cobham.com/HiRel
Datasheet Definition
Advanced Datasheet - Product In Development
Preliminary Datasheet - Shipping Prototype
Datasheet - Shipping QML & Reduced Hi-Rel
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.
Cobham Semiconductor Solutions
35 S. Service Road
Plainview, NY 11803
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
herein, except as expressly agreed to in writing by Aeroflex; nor does the purchase, lease, or use of a product or service from Aeroflex convey a
license under any patent rights, copyrights, trademark rights, or any other of the intellectual rights of Aeroflex or of third parties.
SCD8691
Rev J 3/24/2016
12
Cobham Semiconductor Solutions
www.cobham.com/HiRel