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AS1376

Datasheet - Detailed Descr i pti on

8.1 Output Voltages

Standard products are factory-set with output voltages from 0.5V to 2.2V. A two-digit suffix of the part number identifies the nominal output (see

Ordering Information on page 18). Non-standard devices are available.

For more information contact: http://www.austriamicrosystems.com/contact

8.2 Advantages of Dual Supply Architecture vs Traditional Single Supply Approach

Compared to the traditional single supply approach, employing a P-channel series pass MOSFET, the dual rail architecture ensures improved

performances in a LDO when operating at very low input voltages below the threshold of the internal series power N-channel MOSFET. The

Figure 18 shows simplified block diagrams of single supply P-channel LDO and dual rail N-channel series pass architectures.

Figure 18. Single vs. Dual Supply

The P-channel LDO uses a PMOS output transistor connected in a common source configuration. During regulation, the P-channel gate-source

drain configuration where the source is connected to the regulated output. During regulation, the N-channel gate source voltage increases from

independently. The N-channel source follower design allows improved efficiency and dropout at low input voltages and provides faster load

transient response.

Bandgap

error

amplifier

PMOS

+

-

core

blocks

Bandgap

error

amplifier

NMOS

+

-

core

blocks

Single Supply

Dual Supply