LP2966

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SNVS028E – APRIL 2000 – REVISED APRIL 2013

Drop-Out Voltage

The drop-out voltage of a regulator is defined as the minimum input-to-output differential required to stay within

100mV of the output voltage measured with a 1V differential. The LP2966 uses an internal MOSFET with an

Rds(on) of 1

Ω. For CMOS LDOs, the drop-out voltage is the product of the load current and the Rds(on) of the

internal MOSFET.

Reverse Current Path

The internal MOSFET in the LP2966 has an inherent parasitic diode. During normal operation, the input voltage

is higher than the output voltage and the parasitic diode is reverse biased. However, if the output is pulled above

the input in an application, then current flows from the output to the input as the parasitic diode gets forward

biased. The output can be pulled above the input as long as the current in the parasitic diode is limited to

150mA.

Maximum Output Current Capability

Each output in the LP2966 can deliver a current of more than 150mA over the full operating temperature range.

However, the maximum output current capability should be derated by the junction temperature. Under all

possible conditions, the junction temperature must be within the range specified under operating conditions. The

LP2966 is available in VSSOP-8 package. This package has a junction to ambient temperature coefficient (

235 °C/W with minimum amount of copper area. The total power dissipation of the device is approximately given

by:

(1)

where

•

•

(2)

Figure 33 through Figure 37 show the variation of thermal coefficient with different layout scenarios.

Figure 33.

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