The LT1035 features two positive 5V regulators in the same package. The main regulator offers excellent performance while supplying load currents up to 3A, and the auxiliary regulator provides similar performance while supplying lighter loads of 75mA. The main regulator has the additional feature of being under the shutdown control of a logic signal. When the enable pin is taken to a low logic level, the main regulator shuts down and its output voltage goes to near 0V. During this command, the auxiliary output is unaffected by the main regulator's condition to provide a 5V output.

The main output has current and power limiting combined with thermal shutdown to make it virtually blowout proof. The auxiliary output is not affected by the thermal shutdown mechanism or the state of the main output, allowing it to be used as a back-up in case of overloads or shorts on the main supply.

The logic input of the LT1035 (enable pin) has a 1.6V threshold and can be driven from a high source impedance. This allows it to be driven by most logic families, including TTL and CMOS.

For a 1A version of the LT1035, please see the LT1005 data sheet. For a 12V output voltage version, consult the factory.

Applications

• Power Supply Sequencing
• Remote On/Off Power Control
• Selective System Power during Emergency Power Operation
• Memory Power Supply with Back-Up