Document
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 - 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
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
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).
1 VIN 2
3
VBIAS 4
VRG8691/92
12 11 VOUT 10
9 VSENSE
ENABLE GND
5 6
8 Current Limit 7 Slow Start
SCD8691 Rev J
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC
1 Cobham Semiconductor Solutions www.cobham.com/HiRel
ABSOLUTE MAXIMUM RATINGS
PARAMETER Operating (Junction) Temperature Range Lead Temperature (soldering, 10 sec) Storage Temperature Range VBIAS, VIN Thermal Resistance (Junction to case JC) Power
RANGE -55 to +150
300 -65 to +150
7 1 25 1/
UNITS °C °C °C V
°C/W 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 extende.