SCD8691 Rev H

 Radiation performance

- Total dose: 100 krads(Si),

Dose rate = 50 - 300 rads(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

 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

DESCRIPTION

The Aeroflex Plainview 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).

VRG8691/92

Radiation Tolerant

FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC

November 12, 2013

www.aeroflex.com/voltreg

Standard Products

Adjustable 7.5A Positive LDO Regulator

FEATURES

VRG8691/92

OUT

SENSE

Current Limit

GND

ENABLE

BIAS

Slow Start

 Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.

SCD8691 Rev H 11/12/13

Aeroflex Plainview

ABSOLUTE MAXIMUM RATINGS

PARAMETER RANGE UNITS

Operating (Junction) Temperature Range -55 to +150 °C

Lead Temperature (soldering, 10 sec) 300 °C

Storage Temperature Range -65 to +150 °C

BIAS, VIN 7V

Thermal Resistance (Junction to case JC)1°C/W

Power 25 1/W

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

Output Voltage Range 1.0 to 3.3 V

Case Operating Temperature Range -55 to +125 °C

Output Current 0 to 7.5 A

BIAS 3.3 to 5.5 1/VDC

VIN 1.8 to 5.5 2/VDC

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 CONDITIONS MIN MAX UNITS

Reference Voltage V

REF VIN = VBIAS = 5V, ENABLE = 0, 0A < IOUT < 7.5A 0.985 1.015 V

Line Regulation

2V <

VIN < 3V, VOUT = 1.0V, CIN > 47µF,

4.3V < VIN < 5.3V, VOUT = 3.3V, COUT > 47µF,

-0.2%/V

Load Regulation 0A <

IOUT < 7.5A, CIN > 47µF, COUT > 47µF, - 0.5 %

Ripple Rejection Ratio

f = 120Hz, CLOAD = 47µF,

IN + VRIP > VOUT + VDROP(MAX) @ 5A,

IN = 4.3V, VRIP = 1VP-P, VOUT = 3.3V

80 - dB

Dropout Voltage V

DROP @VOUT = 1%, 0A < IOUT < 7.5A - 0.5 V

Adjustment Pin Current I

ADJ -3µA

Minimum Load Current I

MIN -0mA

Current Limit 2

/ICL 9.5 13.5 A

Long Term Stability 3/ -1%

Supply Current (V

BIAS)IBIAS -15mA

Notes:

1/ Unless otherwise specified, these specifications apply for post radiation: V

BIAS

= V

= 5V, V

OUT

= 3.3V, I

OUT

= 7.5A and -55°C < Tc <+125°C, Min

Input/Output capacity of 47

µF

Tant with 1

µF

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.

VOUT

VIN

VOUT

IOUT

VOUT

TIME

SCD8691 Rev H 11/12/13

Aeroflex Plainview

VRG8691/92

VOUT

VSENSE

VREF (=1V)

CURR. LIMIT

ENABLE

IADJ

0.1µF

47µF

VBIAS

LOW

TART

VBIAS

VIN

CURR. LIMIT

GND

0.1µF

FIGURE 2 –SETTING OUTPUT VOLTAGE

ENABLE 1/

Notes:

/ 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).

/ ICL varies directly with VIN.

(See Application Note 2 for adjusting the Current Limit, ICL).

To set the output voltage for a particular Vout:

- Choose an R2 value. (Recommended value = 1

k

- Then use the following formula to determine the value of R1.

Table 1 shows example values for R1 and R2 to achieve some standard voltages.

Table 2 shows the nominal current limit settings if the ’C

URR. LIMIT’ function (pin 8) is left open.

CLOAD

47µF

VOUT

Table 2

VIN ICL NOM

5V 11.5A

3.3V 7.5A

2.5V 5.7A

1.8V 4.1A

Table 1

Example R1 & R2 for typical V

OUT

VOUT R2 R1

3.3V 1k 2.3k

2.5V 1k 1.5k

1.8V 1k 800

1.0V 1k 0

APPLICATION NOTE 1

BASIC SET-UP

Setting the output voltage (VOUT):

VOUT - VREF

(R2 x IADJ) + VREF

R1 = R2 x

, where VREF = 1v, IADJ typ = 10pA

1µF

TANT

1µF

TANT

CER

Part #	91-901
Description	General Purpose Relays DPDT 24V 12A INRUSH 60A 125V.A.C.
Category	RELAY
Availability	In Stock
Qty	2

Manufacturer	Available	Qty
STANCOR Date Code: 8904	Freelance Stock: 1 Ships Immediately
STANCOR Date Code: 8904	Freelance Stock: 1 Ships Immediately

91-901

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